How To Use Ovule In A Sentence
-
In addition to the unique single vascular system, these new specimens exhibit a distinct six ridged external shape, and an integumentary morphology shared by no other medullosan ovules.
-
Relative to self-pollination, outcross pollination results in greater proportion of flowers setting fruit, and greater proportion of ovules yielding seeds per fruit.
-
However, at anthesis they appear one above the other, because in one ovule the funicle greatly elongates.
-
No inversion can, therefore, really take place in anatropous ovules, but the blade of the leaf is bent back on the funicle, with which its margins also cohere.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
If the pollen from one of the genus Primula fertilises an ovule belonging to a flower of e.g., the genus Hottonia, a bigener would result.
-
Ovules consisted of an outer integument that surrounded the inner integument to form the micropyle, with the inner integument surrounding the nucellus and embryo sac.
-
The number of pollen tubes and ovules in the ovaries of each of six dissected pistils from each cross is shown.
-
The ancestral state in other characters is equivocal: e.g., bisexual vs. unisexual flowers, whorled vs. spiral floral phyllotaxis, presence vs. absence of tepal differentiation, anatropous vs. orthotropous ovules.
A Disclaimer for Behe?
-
During development of the ovule, the inner of the two integuments disappears, while the outer integument differentiates into different layers of the seed coat.
-
Mr. Berkeley's carnation the change was not so great, seeing that the nucleus of the ovule was not developed, and sufficient evidence has been above given as to the foliar nature of the primine, while for a leaf to be folded up so as to form a carpel is an ordinary occurrence.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
Speaking generally, the most common state of things in these flowers was the occurrence on the throat of the calyx, in the position ordinarily occupied by the stamens, and sometimes mingled with those organs, of twisted, ribbon-like filaments, which bore about the centre one or more pendulous, anatropous ovules on their margins.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
In the ovules of most sexual flowering plants female gametogenesis is initiated from a single surviving gametic cell, the functional megaspore, formed after meiosis of the somatically derived megaspore mother cell (MMC) 1, 2.
Naturejobs - All Jobs
-
In the first appropriate fold of the uterine mucous membrans (generally near the mouth of the tube), the ovule is imbedded, and causes by its presence a swelling of the mucous membrane; that is, the menstrual decidua.
Plain facts for old and young : embracing the natural history and hygiene of organic life.
-
Consequently, it reduces male fitness because geitonogamous pollen grains are barred from fertilizing ovules.
-
For example, cases are cited by Mr. Darwin, of plants which are more fertile with the pollen of another species than with their own; and there are others, such as certain 'fuci', whose male element will fertilize the ovule of a plant of distinct species, while the males of the latter species are ineffective with the females of the first.
Origin of Species
-
_Rhododendron_ I have observed a similar condition of the ovules, which, moreover, in the primary flowers, were attached to the walls of the carpels -- parietal placentation.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
The ovule micropyle and embryo sac were penetrated equally by cross- and self-pollen tubes.
-
However, because of the difficulty to isolate the in vivo apical and basal cells of two-celled proembryo from ovule and ovary in higher plants, the transcriptome analysis of them hasn't been reported.
BioMed Central - Latest articles
-
He can be told that "ovule" means little egg, and that the seed of the plant is the egg of the plant, which hatches -- sprouts -- into the plant we see.
The Renewal of Life; How and When to Tell the Story to the Young
-
Fertile flower showing ovuliferous scale with ovules, inner side.
Handbook of the Trees of New England
-
The ancestral state in other characters is equivocal: e.g., bisexual vs. unisexual flowers, whorled vs. spiral floral phyllotaxis, presence vs. absence of tepal differentiation, anatropous vs. orthotropous ovules.
A Disclaimer for Behe?
-
The proportion of flowers and ovules that develop into fruits and seeds in flowering plants rarely reaches 1.
-
Pollination in angiosperms and gymnosperms is the process that transfers pollen grains, which contain the male gametes (sperm) to where the female gamete (s) are contained within the carpel; [1] in gymnosperms the pollen is directly applied to the ovule itself.
Pollination
-
Thanks to the labours of those observers who have devoted their attention to that difficult but most important branch of study, organogeny, or the investigation of the development of the various organs, and to the researches of the students of comparative anatomy or morphology, the main principles regulating the arrangement and form of the organs of flowering plants seem to be fairly well established, though in matters of detail much remains to be cleared up, even in such important points as the share which the axis takes in the construction of the flower and fruit, the nature of the placenta, the construction of the ovules, and other points.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
Brongniart [275] records ovules of _Delphinium elatum_ existing in the form of marginal lobes of the carpellary leaf itself; so that each ovule corresponds to a lobe or large tooth of this leaf, the funiculus, as well as the raphe, being formed by the median nerve of the lateral lobe.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
As the ovary elongates only above the placenta, the ovules appear basal at anthesis.
-
ovule" means little egg; later, a word almost identical will be used for the eggs of animals.
The Renewal of Life; How and When to Tell the Story to the Young
-
Legumes possess highly differentiated seed coats that arise from the inner and outer integuments of the ovule.
-
The ovule is an immature seed, which does not yet contain a viable embryo.
-
Moquin [263] relates having found in the neighbourhood of Montpellier a flower of a tulip the ovary of which was represented by true leaves, which bore on their margins the ovules, and thus presented a striking analogy with the carpels of those Sterculias, like _S. platanifolia_, which are foliaceous in texture and open very early in the course of their development.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
The flowers are protandrous, and larger plants have a lower pollen to ovule ratio than smaller plants, suggesting larger plants invest proportionally more in female function.
-
The proportion of flowers and ovules that develop into fruits and seeds in flowering plants rarely reaches 1.
-
They have investigated, over three seasons, the development process from ovule to viable seed.
-
Screening of M2 lines representing approximately 5,000 M1 individuals identified mutations that enhance the seuss mutant phenotypic disruptions in ovules and gynoecia; here we describe the phenotype of the sum63 mutant and enhanced disruptions of ovule and gynoecial development in the seu sum63 double mutant.
BioMed Central - Latest articles
-
As the ovules developed, they eventually abscised and fell out, leaving the cupules empty.
-
In the center of a typical flower are the carpels, modified leaves which enclose the ovules.
-
The mature ovules of both species are orthotropic and crassinucellate.
-
These, as in Gymnosperms, are of two kinds, microspores or pollen-grains, borne in the stamens (or microsporophylls) and megaspores, in which the egg-cell is developed, contained in the ovule, which is borne enclosed in the carpel (or megasporophyll).
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
-
It remains to be studied exactly how the pollen tubes reach the micropyle of the ovules.
-
Maternal apomictic embryos develop from a somatic cell within the ovule or from an unreduced embryo sac derived from the megaspore mother cell (diplospory).
-
Flowers terminating short branches, sterile and fertile, more commonly on separate trees, often on the same tree; anthers in opposite pairs; ovuliferous scales in opposite pairs, slightly spreading, acute or obtuse; ovules 1-4.
Handbook of the Trees of New England
-
If in a certain time, which represents its vitality, the ovule is not impregnated, it dies, and thus causes congestion and disintegration of the menstrual decidua; that is, the menstrual flow.
Plain facts for old and young : embracing the natural history and hygiene of organic life.
-
The answer would be, as it seems to me, that important morphological characters, such as the position of the ovules and the relative position of the stamens to the ovarium (hypogynous, perigynous, etc.) are sometimes variable in the same species, as I incidentally mention when treating of the ray-florets in the Compositae and Umbelliferae; and I do not see how Nageli could maintain that differences in such characters prove an inherent tendency towards perfection.
More Letters of Charles Darwin — Volume 1
-
Cover-scale and ovuliferous scale with ovules, inner side.
Handbook of the Trees of New England
-
Flowers of all species under study were selfed to determine the time taken by pollen tubes to reach the ovules.
-
Man is developed from a small cell called the ovum or ovule, about the 120th of an inch in diameter, which differs in no apparent respect from the ovules from which other animals grow.
Haeckel on gastrulation - The Panda's Thumb
-
Even when taking contraceptives or anovulants, the number of ovules that we ourselves can use reduces gradually.
-
Everything tends to prove that the ovule which is not immediately impregnated, must have an equal, if not a longer life power than the semen which is deposited in the genital parts.
Plain facts for old and young : embracing the natural history and hygiene of organic life.
-
It would seem probable from the appearances presented by the figure that these ovules were, some of them, polliniferous, like those of the
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
Each carpel has a terminal stigma and a basal ovary with a single ovule.
-
Here, too, may also be mentioned the presence of an adventitious siliqua within the ordinary one attached along the same line as the ovules, and partially divided by a replum into two cavities.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
Each cupule is recurved, has a lip-like projection near the point of attachment, and contains several ovules arranged in a curved row with their micropyles facing the cupule opening.
-
In _Casuarina_, _Juglans_ and the order Corylaceae, the pollen-tube does not enter by means of the micropyle, but passing down the ovary wall and through the placenta, enters at the chalazal end of the ovule.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
-
In other cases no traces of ovules are visible, but the funiculi are in a foliaceous condition.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
However, pollen tubes from control pollen showed normal morphology when growing towards the micropyle of an ovule in a HTS plant.
-
If the healthy ovule is formed, and passes into the uterus, the latter does not allow its imbedding, on account of severe endometritis, profuse secretion, etc.
Plain facts for old and young : embracing the natural history and hygiene of organic life.
-
The receptive part of the gymnosperm ovule is called the micropyle.
Pollination
-
The ovules are the rudimentary seeds, situated in a case at the base of the pistils, each consisting of a central portion, called the nucleus, which is surrounded by two coats, the inner called the secundine, the outer the primine.
The $100 Prize Essay on the Cultivation of the Potato. Prize offered by W. T. Wylie and awarded to D. H. Compton. How to Cook the Potato, Furnished by Prof. Blot.
-
Distal flowers are often smaller and produce fewer or smaller ovules, seeds and fruits, but they may have higher pollen production.
-
Hims bees a voarayshus reeder, gobblyng novules iyndyskrimynatelee!
NOM sawyer - Lolcats 'n' Funny Pictures of Cats - I Can Has Cheezburger?
-
The gynoecium consists of 2 unilocular ovaries each containing an indefinite number of ovules.
The Medicinal Plants of the Philippines
-
The ancestral state in other characters is equivocal: e.g., bisexual vs. unisexual flowers, whorled vs. spiral floral phyllotaxis, presence vs. absence of tepal differentiation, anatropous vs. orthotropous ovules.
A Disclaimer for Behe?
-
The inner integument initiates as a ring of cells around the circumference of the ovule primordium and exhibits symmetrical cylindrical growth until it surrounds and encases the nucellus.
-
We find now that the ovule is attached to a stalk (funiculus) (Fig. 81, _G_, _f_), the body of the ovule being bent up so as to lie against the stalk.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
-
Inferred ancestral features include more than two whorls (or series) of tepals and stamens, stamens with protruding adaxial or lateral pollen sacs, several free, ascidiate carpels closed by secretion, extended stigma, extragynoecial compitum, and one or several ventral pendent ovule (s).
A Disclaimer for Behe?
-
In the case of the prawn-like crabs, their movements were as coinstantaneous as in a regiment of soldiers; but this cannot happen from anything like voluntary action with the ovules, or the confervae, nor is it probable among the infusoria.
Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle
-
In these plants, some sepals showed homeotic transformations to carpels, becoming fused and presenting ovules and stigmatic papillae.
-
Among _Umbelliferæ_ affected with frondescence of the pistil a similar increase in the number of ovules takes place.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
Would you not consider as a morphological difference the trimerous, tetramerous, etc., divisions of flowers, the ovules being erect or suspended, their attachment being parietal or placental, and even the shape of the seed when of no service to the plant.
More Letters of Charles Darwin — Volume 2
-
In many legumes, seeds are arranged linearly within the pod, making it relatively simple to study the effect of position of the ovule on seed abortion and seed set.
-
The ovary has axile intruded placentae with around 250-350 ovules.
-
The ancestral state in other characters is equivocal: e.g., bisexual vs. unisexual flowers, whorled vs. spiral floral phyllotaxis, presence vs. absence of tepal differentiation, anatropous vs. orthotropous ovules.
A Disclaimer for Behe?
-
It is well known that most flowering plants produce more ovules than the number of seeds they mature.
-
What! The sporule of a scrap of moss requires an antherozoid before it is fit to germinate; and the ovule of a Scolia, that proud huntress, can dispense with the equivalent in order to hatch and produce a male?
Bramble-Bees and Others
-
An ovule after strong maceration exhibits an inner cuticular envelope that extends upwards into the prominent micropyle and there is a rare relict of pubescent tapetum tissue at the base.
-
In apomixis, an embryo is created from a diploid cell in the ovule.
-
Ovules from self-pollinated carpels appear to degenerate early in development.
-
Inferred ancestral features include more than two whorls (or series) of tepals and stamens, stamens with protruding adaxial or lateral pollen sacs, several free, ascidiate carpels closed by secretion, extended stigma, extragynoecial compitum, and one or several ventral pendent ovule (s).
A Disclaimer for Behe?
-
Each bract bears an ovule adnate to its expanding base.
-
The number of initial ovules (number of ovules at anthesis) from the fruits was estimated by multiplying the number of carpels by two, because each carpel always has two ovules.
-
Ovule position was determined by counting each ovule from the stylar end (closest to the style) to the basal end (closest to the peduncle) of the ovary.
-
Only one plant in the apomixis treatment developed two ovules.
-
Moreover, we did not observe increased levels of seed or ovule abortion in any seth mutants.
-
-- _Sinapis_, replum and ovules; the dotted line shows the position of the carpels.]
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
The ovule is surrounded by integument tissues which produce the seed coat, and in the earliest seed plants another layer called the cupule enclosed the entire ovule/seed.
-
In this second class of cases the corolla is papilionaceous, the filaments free, the carpellary leaf on a long stalk provided with stipules, its blade more or less like the usual carpel, with its margins disunited or more commonly united with the ovules in the interior, sometimes represented by a foliaceous, dentate primine only.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
Thanks for telling me, Terri, since "carpel" means "One of the structural units of a pistil, representing a modified ovule-bearing leaf.
The Naked Truth about Literature and Life
-
The ancestral state in other characters is equivocal: e.g., bisexual vs. unisexual flowers, whorled vs. spiral floral phyllotaxis, presence vs. absence of tepal differentiation, anatropous vs. orthotropous ovules.
A Disclaimer for Behe?
-
Pollen tubes then exit the site of intercellular growth at the base of the funiculus where they continue to grow within the ovary locule along the adaxial carpel surface to finally enter the ovule micropyle.
-
Position and external circumstances may have some indirect effect, and it may, perhaps, be significant that in all the instances of polliniferous ovules, the ovular structures have been exposed on an open carpel or otherwise, in place of being confined within the cavity of a closed ovary, as under ordinary circumstances.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
The development of the ovule, which represents the macrosporangium, is very similar to the process in Gymnosperms; when mature it consists of one or two coats surrounding the central nucellus, except at the apex where an opening, the micropyle, is left.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
-
For example, cases are cited by Mr. Darwin, of plants which are more fertile with the pollen of another species than with their own; and there are others, such as certain ‘fuci’, whose male element will fertilize the ovule of a plant of distinct species, while the males of the latter species are ineffective with the females of the first.
Essays
-
Note that this is a strobilus with possible homology to the ovule-bearing cone of conifers.
-
Less coherent expression was detected in the endodermis of the root elongation zone, in the stem of the young inflorescence, pollen tubes, base of axillary buds, ovules, chalazal endosperm, and fruit abscission zone.
-
In these flowers the placenta seemed to be composed of several funiculi soldered together, and bearing imperfect ovules.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
Once the pollen has fertilized the egg cell contained within the ovule, the ovule develops into a seed, and the ovary of the enclosing carpel begins to enlarge and ripen, forming the fruit.
-
In addition, the grains were observed to float in water with sacci uppermost, consistent with the suggestion that distally placed sacci serve to orientate the germinal furrow of the pollen grain towards the nucellus of an inverted ovule.
-
As well might they doubt the necessity of the application of the boyau to an ovule, (or the existence of the boyau itself,) because the derivation of the embryo cannot be proved.
Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries
-
If the ovary is split open, within it will be found a little body called an ovule, which is to develop into a seed.
The First Book of Farming
-
The ovule is a part of every ovary just as the pollen is a part of every anther.
The Renewal of Life; How and When to Tell the Story to the Young
-
After a time growth ceases, and is not resumed until the development of the female prothallium and archegonia is nearly complete, which does not occur until more than a year from the time the pollen spore first reaches the ovule.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
-
Flowers terminal, dark reddish-brown; sterile and fertile, usually on the same plant, rarely on separate plants; anthers opposite; filaments short; ovuliferous scales opposite, with slight projections near the base, usually 2-ovuled.
Handbook of the Trees of New England
-
Each growing ovule is seen attached to the pod wall via a funiculus, and the ovule has initiated a curved and bent orientation.
-
During pollination the female portion of the plant receives pollen from the tassel, resulting in fertilization of the ovule (kernel).
-
So, also, in the Rose with polliniferous ovules (see p. 274).
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
I keep seeing an ovule and several sperms in there –
It’s Not Summer without a Popsicle - The Retroist
-
This tactic seems risky, because not all ovules get fertilized, and the unfertilized ones abort without storing nutrients.
-
These, as in Gymnosperms, are of two kinds, microspores or pollen-grains, borne in the stamens (or microsporophylls) and megaspores, in which the egg-cell is developed, contained in the ovule, which is borne enclosed in the carpel (or megasporophyll).
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
-
The entire placenta with attached ovules was removed via a longitudinal incision in the ovary wall.
-
A pollinator is the biotic agent (vector) that moves pollen from the male anthers of a flower to the female stigma of a flower to accomplish fertilization or '' syngamy '' of the female gamete in the ovule of the flower by the male gamete from the pollen grain.
Pollinator
-
Like other seed plants, angiosperms are heterosporangiate, producing pollen and ovules in different organs.
-
The cone exhibits at least a partially bisexual character that appears to have pollen sacs with monosulcate ribbed pollen grains and sessile, asymmetric, and radiospermic ovules.
-
During in vivo development, maternal apomixis refers to the asexual formation of a seed from the maternal tissues of the ovule, avoiding the processes of meiosis and fertilization.
-
Many parasitic insects lay their eggs in fertilized ovules so that their young can feed on the starches, fats, and proteins within.
-
The gynoecium consists of 2 unilocular ovaries each containing an indefinite number of ovules.
The Medicinal Plants of the Philippines
-
If a third ovule is present, it is obliquely directed and its placenta is lateral.
-
In two ovules there was an odd appearance, as if the outer coat of ovule at the chalaza end (if I understand the ovule) had naturally opened or withered where most of the pollen-tubes seemed to penetrate, which made me at first think this was a widely open foramen.
More Letters of Charles Darwin — Volume 2
-
The cell growth in question is effected in the ovaries; the final stage of the process, the rupture of the containing cell or ovisac, and escape of the ovule, is attended by a concentration of nervous activity in the ganglionic masses sending nerves to those organs -- analogous to that which occurs in the solar plexus at periods of digestion; the fall of the ovule is itself analogous to the shedding of epithelial cells in the gastric follicles; the afflux of blood to the utero-ovarian veins, analogous to the periodical congestion of the gastro-splenic vascular apparatus.
The Education of American Girls
-
Pollen grains are packaged into polyads of 32 associated monads, more than enough to fertilize the ovules of an individual flower.
-
Aposporous embryo sacs were identified easily due to the lack of antipodal cells and because they showed varying positions and orientation within the ovule.
-
The results of analysis of variance in numbers of ovules and pollen grains with position along the flowering shoot are shown in Table 2.
-
Note that this is a strobilus with possible homology to the ovule-bearing cone of conifers.
-
Micropyles are marked with arrows (longitudinal in longer ovule, transverse in shorter ovule).
-
Some carpels and ovules were only slightly enlarged despite the flowers being cross-pollinated by hand.
-
Would you not consider as a morphological difference the trimerous, tetramerous, etc., divisions of flowers, the ovules being erect or suspended, their attachment being parietal or placental, and even the shape of the seed when of no service to the plant.
More Letters of Charles Darwin — Volume 2
-
In a species of _Triumfetta_ (see p. 260), of which I examined dried specimens, the ovary was open and partly foliaceous; it bore on its infolded margins ten erect leaflets, representing so many ovules; each leaflet was conduplicate, the back being turned towards the placenta.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
-
At the septum, pollen tubes migrate into the ovary and approach an ovule containing an FG.
-
The two sperm cells enter the ovule - in the ovule are a diploid cell called the polar nucleus and a haploid female gamete
Recently Uploaded Slideshows
-
Sections located on the stylar half contain ovules with a low probability of seed abortion, while sections 3 and 4 have a high probability of seed abortion.
-
Such an inverted ovule is called technically, "anatropous.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
-
Polyembryonic seeds can arise through several developmental pathways and in some cases may involve apomixis stimulated by fertilization of nearby ovules.
-
Compound nectary of 5 unilocular, many-ovuled ovaries.
The Medicinal Plants of the Philippines
