microspore

How To Use microspore In A Sentence

• They have male spores called microspores and female spores called megaspores.
• The results showed that it was necessary to isolate microspores in the late uninucleate stage.
• 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
• Special emphasis is given to the initial stages of microspore embryogenic potential acquirement and the initiation of cell divisions.
• Only about 15% of viable microspores stayed at the haploid uninucleate or binucleate stages.
• 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
• Within the microsporangium, the microspores are embedded in a foamy mass that is dispersed as ‘floats’.
• Microspores cultured in vitro in a rich medium develop into mature pollen grains, which are fertile upon pollination in vivo.
• Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
• Low temperature and mannitol pretreatment favor the maintaining of microspore activity.