نتایج جستجو برای: megaspore
تعداد نتایج: 107 فیلتر نتایج به سال:
The heterosporous fern Regnellidium diphyllum occurs in southern Brazil and some adjoining localities in Uruguay and Argentina. Currently it is on the list of threatened species in the state of Rio Grande do Sul. Anthropic alterations such as the conversion of wetlands into agricultural areas or water and soil contamination by pollutants may compromise the establishment and survival of this spe...
A M O N G the progenies of advanced corn-backcross generations of hybrids of 2n Zea mays L. X 2n Tripsacum dactyloides L., several 21-chromosome stocks have been isolated which contain the 20 normal chromosomes of corn plus an extra chromosome from Tripsacum. In one of these, the extra chromosome has been transmitted through the egg in 91 percent of the 80 offspring which have been grown and ch...
The fertilization-related kinase 1 (ScFRK1), a nuclear-localized mitogen-activated protein kinase kinase kinase (MAPKKK) from the wild potato species Solanum chacoense, belongs to a small group of pMEKKs that do not possess an extended N- or C-terminal regulatory domain. Initially selected based on its highly specific expression profile following fertilization, in situ expression analyses revea...
The first megaspores recovered from Ukrainian Lower Cretaceous strata are described and illustrated by reflected light scanning electron micrography. Four lycopsid megaspore taxa identified in core samples north of Kherson (Khersons'ka Oblast), the Black Sea Basin, southern Ukraine. Miospore assemblages same reveal a slightly higher diversity microspores and, conjunction with previous foraminif...
Germ line specification is a crucial step in the life cycle of all organisms. For sexual plant reproduction, the megaspore mother cell (MMC) is of crucial importance: it marks the first cell of the plant "germline" lineage that gets committed to undergo meiosis. One of the meiotic products, the functional megaspore, subsequently gives rise to the haploid, multicellular female gametophyte that h...
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