How To Use Micropyle In A Sentence
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Coupling these screens with a visual assessment of seed formation has yielded mutants defective in FG development or in the ability of pollen tubes to release their sperm after entering the micropyle.
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Only one pollen tube tip entered the nucellus through the micropyle.
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Micropyles are marked with arrows (longitudinal in longer ovule, transverse in shorter ovule).
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Such a method of entrance is styled chalazogamic, in contrast to the porogamic or ordinary method of approach by means of the micropyle.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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The outer integument remains two cell layers thick throughout development and does not contribute to the micropyle.
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It is, furthermore, the case that the embryo sac itself also exhibits polar organization, with the egg cell and synergids adjacent to the micropyle, while the antipodal cells are found at the opposite chalazal end.
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In a favorable situation, an opening called the micropyle appears and releases amoebocytes, which differentiate into cells of all the other types.
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The new occident cakchiquel evasion silkwood of lockage, ledgeman from notepad tegucigalpa, warning hewer ithaca and web diplegia for micropyle.
Rational Review
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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
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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.
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A nucellar dome has been formed in the massive nucellar cap and the integument has overgrown the nucellus and formed a wide-open micropyle.
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The micropyle is the pore through which the radicle emerges during seed germination.
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Sperm enter the anterior end of the egg through the micropyle.
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The radicle and plumule form a small subglobose unit, the embryonic axis, whose acuminate lower end extends into the micropyle.
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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.
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The entrance of pollen-tubes into the nucellus by the chalaza, instead of through the micropyle, was first fully demonstrated by Treub in his paper "Sur les
More Letters of Charles Darwin — Volume 2
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The receptive part of the gymnosperm ovule is called the micropyle.
Pollination
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However, pollen tubes from control pollen showed normal morphology when growing towards the micropyle of an ovule in a HTS plant.
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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
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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.
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Such a method of entrance is styled chalazogamic, in contrast to the porogamic or ordinary method of approach by means of the micropyle.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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It remains to be studied exactly how the pollen tubes reach the micropyle of the ovules.
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The ovule micropyle and embryo sac were penetrated equally by cross- and self-pollen tubes.
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Within the ovary, pollen tubes also grew in the ECM to penetrate the micropyle and subsequently grew intercellularly within the nucellus up to the embryo sac.
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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.
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It is, furthermore, the case that the embryo sac itself also exhibits polar organization, with the egg cell and synergids adjacent to the micropyle, while the antipodal cells are found at the opposite chalazal end.
