نتایج جستجو برای: megaspore

تعداد نتایج: 107  

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2012
M A Kieling-Rubio A Droste P G Windisch

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...

Journal: :Genetics 1963
M P Maguire

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...

2015
Edith Lafleur Christelle Kapfer Valentin Joly Yang Liu Faiza Tebbji Caroline Daigle Madoka Gray-Mitsumune Mario Cappadocia André Nantel Daniel P. Matton

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...

Journal: :Cretaceous Research 2021

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...

2011
Anja Schmidt Samuel E. Wuest Kitty Vijverberg Célia Baroux Daniela Kleen Ueli Grossniklaus

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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