نتایج جستجو برای: ovule
تعداد نتایج: 1286 فیلتر نتایج به سال:
The life cycle of flowering plants alternates between a predominant sporophytic (diploid) and an ephemeral gametophytic (haploid) generation that only occurs in reproductive organs. In Arabidopsis thaliana, the female gametophyte is deeply embedded within the ovule, complicating the study of the genetic and molecular interactions involved in the sporophytic to gametophytic transition. Massively...
in order to identify the best maturity time for excision of fertilized ovules in interspecific hybridization, intercrosses were made between two diploid (gossypium herbaceum and g. arboreum, 2n=26) and two tetraploid species (g. barbadense and g. hirsutum, 2n=52). flower morphology, growth rate of ovules and ovaries, as well as fiber growth pattern in various time scales post anthesis were reco...
BACKGROUND AND AIMS Ranunculaceae has a prominent phylogenetic position in Ranunculales which appears at the base of eudicots. The aims of the present paper are to reveal the features of ovule morphogenesis in different taxa and gain a better understanding of the systematics of Ranunculaceae. METHODS Flowers of 17 species from three subfamilies, nine tribes and 16 genera of Ranunculaceae, at ...
Title of Document: POLLEN TUBES FAIL TO TARGET OVULE IN THE ABSENCE OF TWO CATION/PROTON EXCHANGERS IN ARABIDOPSIS Yongxian Lu Doctor of Philosophy, 2010 Directed By: Professor Heven Sze Department of Cell Biology & Molecular Genetics Flowering plant reproduction requires precise delivery of the sperm cells to the ovule by a pollen tube. Guiding signals from female cells are being identified, t...
BACKGROUND AND AIMS Pollen limitation is a significant determinant of seed production, and can result from both insufficient pollen quantity (pollen shortage) and quality (mainly relating to self-pollination). For animal-pollinated tree species with large floral displays, pollen limitation may be determined by a balance between increased pollen quantity due to increased attractiveness for polli...
Ovules are fundamental for plant reproduction and crop yield as they are the precursors of seeds. Therefore, ovule specification is a critical developmental program. In Arabidopsis thaliana, ovule identity is redundantly conferred by the homeotic D-class genes SHATTERPROOF1 (SHP1), SHP2 and SEEDSTICK (STK), phylogenetically related to the MADS-domain regulatory gene AGAMOUS (AG), essential in f...
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