نتایج جستجو برای: ovule culture
تعداد نتایج: 278593 فیلتر نتایج به سال:
BACKGROUND AND AIMS Resource allocation to flowers, fruits and seeds can vary greatly within an inflorescence. For example, distal fruits are often smaller and produce fewer and smaller fruits and seeds than more basal fruits. To assess the causes and functional significance of intra-inflorescence variation, pollen and resources were manipulated to test whether such patterns could be altered wi...
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...
The effects of temperature on rates of cellulose synthesis, respiration, and long-term glucose uptake were investigated using cultured cotton ovules (Gossypium hirsutum L. cv Acala SJ1). Ovules were cultured either at constant 34 degrees C or under cycling temperatures (12 h at 34 degrees C/12 h at 15-40 degrees C). Rates of respiration and cellulose synthesis at various temperatures were deter...
The floral-dip method for Agrobacterium-mediated transformation of Arabidopsis allows efficient plant transformation without need for tissue culture. To facilitate use with other plant species, we investigated the mechanisms that underlie this method. In manual outcrossing experiments, application of Agrobacterium tumefaciens to pollen donor plants did not produce any transformed progeny, where...
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...
selon les pédagogues, la culture étant un élément très important dans le processus de lapprentissage de langue étrangère et la maîtrise de la compétence linguistique requiert celle de la compétence culturelle. la littérature dun pays est comme un miroir qui reflète bon nombre daspects culturels, cest pourquoi avec le choix dun texte littéraire convenable, lenseignant peut assurer à la fois lapp...
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