How To Use Microspore In A Sentence
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Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
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Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
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Some of the large sphenophyte trees of the Paleozoic were heterosporous, producing large megaspores and small microspores, and probably retaining the megaspore in the strobilus.
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Within the microsporangium, the microspores are embedded in a foamy mass that is dispersed as ‘floats’.
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Although this relationship may vary between species, for a particular species it is constant, indicating that the polarity of the pollen grain owes its origin to the topology of microspore tetrad formation.
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Their heterosporous life cycle (including both megaspores and microspores) is likely to be an adaptation to their aquatic habit.
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The embryogenic process originated during anther culture may have different origins, for example, haploid cells such as microspores or pollen grains, or somatic cells from anther tissues.
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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
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The pollen cells are formed from mother cells by a process of cell division and subsequent setting free of the daughter cells or pollen cells by rejuvenescence, which is distinctly comparable with that of the formation of the microspores of Lycopodiaceæ, etc. The subsequent behavior of the pollen cell, its division and its fertilization of the germinal vesicle or oosphere, leave no doubt as to its analogy with the microspore of vascular cryptogams.
Scientific American Supplement, No. 531, March 6, 1886
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At the late stage of the sporogenous cells, mother pollen cells and microspores, the vacuoles remarkably increased in quantity or size.
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Microspores were induced to enter the embryogenic pathway by pretreating whole anthers in mannitol salt solution.
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The endogenous hormonal ratio was interdependent to the microspore abortion of radish.
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The tapetal tissue has a secretory role providing essential nutrients required for microspore and pollen grain development.
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In barley, a combination of starvation and osmotic stress is able to induce efficiently a microspore developmental switch from the gametophytic to the sporophytic pathway, a process called androgenesis.
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They have male spores called microspores and female spores called megaspores.
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They have male spores called microspores and female spores called megaspores.
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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
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The polarity of the micro-gametophyte (pollen grain) of flowering plants is related to the proximal-distal axis of the microspore from which it develops.
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Sterile plants produce microspores aborted in tetrads, no visible pollen shed, and parthenocarpic pods bearing no seeds.
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Topaz is a variety of canola exhibiting a high frequency of embryogenesis in isolated microspore cultures.
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Low temperature and mannitol pretreatment favor the maintaining of microspore activity.
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Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
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Microspores cultured in vitro in a rich medium develop into mature pollen grains, which are fertile upon pollination in vivo.
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Within the microsporangium, the microspores are embedded in a foamy mass that is dispersed as ‘floats’.
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The macrospore or embryo-sac produces a prothallium called the endosperm, in which archegonia or corpuscula are formed; and lastly, in typical dicotyledons it is only lately that any trace of a prothallium from the microspore or pollen cell has been discovered, while the macrospore or embryo-sac produces only two or three prothallium cells, known as antipodal cells, and two or three oospheres, known as germinal vesicles.
Scientific American Supplement, No. 531, March 6, 1886
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Only about 15% of viable microspores stayed at the haploid uninucleate or binucleate stages.
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Special emphasis is given to the initial stages of microspore embryogenic potential acquirement and the initiation of cell divisions.
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The pollen cells are formed from mother cells by a process of cell division and subsequent setting free of the daughter cells or pollen cells by rejuvenescence, which is distinctly comparable with that of the formation of the microspores of Lycopodiaceæ, etc. The subsequent behavior of the pollen cell, its division and its fertilization of the germinal vesicle or oosphere, leave no doubt as to its analogy with the microspore of vascular cryptogams.
Scientific American Supplement, No. 531, March 6, 1886
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The results showed that it was necessary to isolate microspores in the late uninucleate stage.
