How To Use Microspore In A Sentence
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They have male spores called microspores and female spores called megaspores.
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The results showed that it was necessary to isolate microspores in the late uninucleate stage.
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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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Special emphasis is given to the initial stages of microspore embryogenic potential acquirement and the initiation of cell divisions.
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Only about 15% of viable microspores stayed at the haploid uninucleate or binucleate stages.
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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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Within the microsporangium, the microspores are embedded in a foamy mass that is dispersed as ‘floats’.
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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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Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
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Low temperature and mannitol pretreatment favor the maintaining of microspore activity.
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Topaz is a variety of canola exhibiting a high frequency of embryogenesis in isolated microspore cultures.
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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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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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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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Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
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They have male spores called microspores and female spores called megaspores.
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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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The tapetal tissue has a secretory role providing essential nutrients required for microspore and pollen grain development.
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The endogenous hormonal ratio was interdependent to the microspore abortion of radish.
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Microspores were induced to enter the embryogenic pathway by pretreating whole anthers in mannitol salt solution.
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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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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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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 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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Their heterosporous life cycle (including both megaspores and microspores) is likely to be an adaptation to their aquatic habit.
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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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Within the microsporangium, the microspores are embedded in a foamy mass that is dispersed as ‘floats’.
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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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Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
