How To Use Meristem In A Sentence
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Companion cell An elongated thin walled cell cut off longitudinally from the same meristematic cell as the SIEVE ELEMENT with which it is closely associated.
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When the seeds sprout, some individuals produce annularly inflated hair zones above early initial roots near root tip meristematic zones.
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Leaves communicate photoperiodic signals to meristems, stolons and buds in flowering, tuberization and dormancy.
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Leaves communicate photoperiodic signals to meristems, stolons and buds in flowering, tuberization and dormancy.
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Leaves in vascular plants are produced by determinate growth on the flanks of indeterminate shoot apical meristems.
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Since leaf bases provide insulating protection to the apical meristem, this is one reason to not overtrim palms at any time of the year.
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The flower meristems are produced acropetally by the inflorescence meristem and are subtended by bracts.
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The reproductive shoot apex contains the indeterminate, primary inflorescence meristem that produces the main inflorescence axis of the plant.
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Thus, significant inflorescence and floral meristem activity is restored to stm null mutant plants in the absence of ULT1 function.
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In each bundle, separating the xylem and phloem, is a layer of meristem or active formative tissue, known as cambium; by the formation of a layer of cambium between the bundles
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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Leaf is the first lateral organ produced by the activity of the shoot apical meristem ( SAM ).
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Superficially it appears to be a periclinal chimera with a chlorophyll-deficient mutation in the second layer of the meristem.
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The formation of lateral root meristems, induced by low concentrations of paraquat or alloxan, was initiated in the pericycle, but not in the cortex or epidermis of Arabidopsis seedlings.
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Mitotic inhibitors were used on seed or meristem material to produce tetraploid plants or sectors of plants of selected clones of amur maple, Norway maple, mimosa, trumpet vine, tutsan St. Johnswort, goldenraintree, privet, callery pear, and lacebark elm.
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In the 1930s, Cornell University plant scientist James Knott coined the term "florigen" for a mysterious signal that instructs flowers to begin growing at the tips of stems, called apical meristems.
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The chromosome changes seen in meristems 2-3 cell cycles after treatment provide a basis for diplontic selection; for the establishment of a new meristem from, perhaps, a few initial cells.
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Leaves are formed from an intercalary meristem which is positioned within the leaf sheaths of subtending leaves.
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These are the potential meristems that are formed at the base of each leaf during vegetative growth.
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Yes, but the key to understanding and manipulating plant form lies in unraveling the communication machinery that enables shoot apical meristem cells to continuously coordinate the processes of stem-cell proliferation and organ primordia initiation.
Alfred Hitchcock's Mystery Magazine
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Leaf is the first lateral organ produced by the activity of the shoot apical meristem ( SAM ).
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The fusion of the corolla lobes to a sympetalous corolla is late (late sympetaly) taking place by meristem incorporation and fusion across the backs of the anther primordia.
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The stem cell population resides at the very apex of the meristem and replenishes those cells that are lost during organogenesis on the meristem flanks.
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Floral organ identity genes control the identity of the organs in the four floral whorls - the sepals, petals, stamens, and carpels - and act downstream of the meristem identity loci.
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Careful examination of serial sections failed to ascertain the presence of true meristematic cells in these atrophied buds.
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Similarly, meristem activities in the same acropetal sequence or on the whole-root-system architecture have not yet been compared.
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Cytokinins were analysed in leaf extracts, leaf phloem exudate and in the shoot apical meristem at different times during floral transition.
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Mendel, Gregor meristem metabolism metamorphosis microorganisms missing link mitochondrion mitochondrial Eve mitosis molecular biology mollusks
21. Life Sciences
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Scanning electron micrographs provide a reference for each stage to illustrate the progression from vegetative meristem to inflorescence meristem and floral organs.
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Despite the great diversity of leaf morphology, all leaves are defined by a flattened dorsiventral transactional symmetry, determinate development, and initiation from the flanks of the shoot apical meristem.
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This condition can also be due to restricted diffusion of oxygen into internal tissues or high rates of cellular metabolism, as in actively dividing cells of meristems.
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The developmentally accumulated proteins localized to early differentiating, but not the highly dividing, regions of the root and shoot apical meristems.
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Later, the meristems of the epicotyl (stem or top) and root axis develop, but the whole embryo is still microscopic in size.
Northern Nut Growers Association Incorporated 39th Annual Report at Norris, Tenn. September 13-15 1948
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The most important observation made from our experimental data is that the meristem is a highly plastic tissue, which undergoes substantial changes in domain organization and cell behavior in response to environmental and developmental cues.
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Flower meristem, flower buds, and leaves from green and 2 d-etiolated plants were analysed for ATP and ADP contents.
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The second intercalary meristem gives rise to the internode.
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Leaves communicate photoperiodic signals to meristems, stolons and buds in flowering, tuberization and dormancy.
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However, the intercalary meristem is considerably longer when considering the leaf extension zone.
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If the pest can find no host 'it never develops a growing shoot (apical meristem), it never becomes photosynthetic, and it dies.
Chapter 23
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The plants had defective shoot apical meristems and grew slowly in vitro.
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In flowers, both genes are expressed throughout inflorescence and floral meristems and in developing organ primordia.
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The coleoptile and coleorhiza are sheaths that enclose the apical meristem of the shoot and root respectively.
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Cell proliferation and cell fate are controlled from dividing cell division centres (called meristems) or latent pluripotent stem cells within the cambium or pericycle.
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Because the blade of grass-type monocots elongate due to activity of the intercalary meristem at the blade base, the tip of the blade is more aged than the base.
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Wood is a tissue which is formed under the bark of the trunk by the meristem, the cambium.
1. Wood
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Damage caused to DNA may, in turn, induce mutation and chromosome abnormalities of the meristem cells.
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The distinct morphology of this and other brain cacti, known as cristate or crested growth, is caused by an apical meristem gone awry.
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A near hyperbolic relationship between respiration rates and meristem radii was observed.
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Commonly, the apical meristems differentiated into reproductive structures, making these plants monocarpic and determinant in their growth pattern.
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Instead of leaves, a floral meristem gives rise in sequence to sepals, petals, stamens, and carpels.
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Meristems are stable structures in spite of the very dynamic nature of their constituent cells, which continuously divide, grow and differentiate while they transit from one zone to another.
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These embryos had organized root meristems and apical shoot meristems flanked by the developing cotyledons.
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It was from this histogenetic rather than cellular conception of the meristem that Hanstein's Histogen Theory was developed.
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It is not clear whether this acropetal increase of flower meristem identity is related to the acropetal loss of the SD suppression.
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Plant growth originates from meristems, localized tissues with stem cell features that are at the origin of all organs of the plant.
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These branches grow out from orthotropic epicormic buds that apparently originate from the axillary meristems in the main stem.
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Mercury program merger meridian meristem meritocracy
Entry Index: menopause to Nation, Carry
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Cell division occurs mainly at the intercalary meristem at the base of the internode, but also throughout the internode at early stages of internode development.
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Mitotic indices were determined by recording mitotic figures (except prophases) separately in the central and peripheral zones as well as in the rib meristem of the SAM.
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The floral meristems are formed acropetally and are initiated on the periphery of the inflorescence meristem, being protected by bracts.
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The geometrical analysis yields the principal curvatures and the Gaussian curvature for each cell on the reconstructed meristem surface.
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Root caps were removed and the meristem was placed in a drop of 45% acetic acid on a clean microscope slide, macerated and squashed between slide and coverslip.
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Therefore, no data were available in these species for the developmental transition of meristem from the juvenile to the mature foliose root.
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In lupins, division of the shoot meristem into four quadrants gives four new meristems that each develop a shoot.
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From this and related work it has become necessary to define a meristem by its phyllotaxy and other growth patterns and not the identity of organs it produces.
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In the determinate type, the inflorescence meristem becomes a terminal flower, whereas in the indeterminate type the inflorescence meristem gives rise to a number of floral meristems.
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In the first step, a leaf primordium is formed that involves a switch from indeterminate to leaf developmental fate in the shoot apical meristem cells.
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Telah diobservasi pada meristem tomat, expanding tissues, ripening fruit.
Hubungan Antara Dinding Sel dan Pemasakan Buah – Netsains.Com
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Yes, but the key to understanding and manipulating plant form lies in unraveling the communication machinery that enables shoot apical meristem cells to continuously coordinate the processes of stem-cell proliferation and organ primordia initiation.
Alfred Hitchcock's Mystery Magazine
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Sepal initiation began on the basal lateral flower and continued in an acropetal direction until all floral meristems had completed sepal initiation.
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Xylem and xylem parenchyma can be recognized in the centre of the taproot surrounded by a ring of meristematic tissue with very high intensity.
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A floral meristem gives rise in sequence to sepals, petals, stamens, and carpels.
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Large differences exist, for example, in the rate at which tundra plants can respond to changes in weather and climate, due to differences in allocation to stems versus leaves or to secondary chemistry versus new growth [32], in the ability to add new meristems [33], and in the constraints on the amount of growth that can be achieved by a single meristem within a single year (i.e., determinate versus indeterminate growth).
Effects of changes in climate and UV radiation levels on function of arctic ecosystems in the short and long term
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In these stems and leaves with intercalary meristems, the upward transpiration stream clearly bypassed most of the enlarging cells.
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Three main aspects of vegetative development were investigated: the quantity of primary growth; the number and nature of developing axillary shoots; and meristem death.
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The superiority of the technique is warranted by the fact that perfectly healthy clones could be produced by the technique of meristem culture.
1. Household gardening projects in asia: past experience and future directions
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This line appeared to be suitable to study in more detail the local consequences of enhanced cytokinin production in axillary meristems.
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Unfortunately, current knowledge on architecture and programming of shoot meristem was not used in this explanation to support genetic results against diplontic selection.
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Among the different pools of N, amino acids and soluble proteins significantly accumulated in autumn and were extensively mobilized from taproots when meristem reactivation occurred in the spring.
