Results 221 to 230 of about 14,827,741 (270)

Ovule and embryo development, apomixis and fertilization

Current Opinion in Plant Biology, 1998
Genetic analyses, particularly in Arabidopsis, have led to the identification of mutants that define different steps of ovule ontogeny, pollen stigma interaction, pollen tube growth, and fertilization. Isolation of the genes defined by these mutations promises to lead to a molecular understanding of these processes.
A M, Chaudhury, S, Craig, E, Dennis, W, Peacock   +3 more
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DEVELOPMENT AND COMPOSITION OF THE SPINACH OVULE

Acta Botanica Neerlandica, 1980
SUMMARY The ultrastructure and histochemistry of the developing spinach ovule have been examined. The development and differentiation of the integuments, nucellus and female gametophyte results in an ortho-amphitropous organisation of the ovule. In the nucellus four parts can be distinguished: the conductive part, the original chalazal part, the ...
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Ovule development in Arabidopsis: progress and challenge

Current Opinion in Plant Biology, 2011
Female gametophyte, the central core of the ovule, is a simple seven-celled reproductive structure. Its stereotyped ontogeny provides a traceable model system to study mechanisms controlling cell growth, cell division, cell fate, pattern formation, and perhaps the function of essential genes in plants.
Dong-Qiao, Shi, Wei-Cai, Yang
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Structure and Development of the Ovule in Bromeliaceae

Kew Bulletin, 2004
Ovule structure and development are described for twelve species of Bromeliaceae, representing ten genera and all three subfamilies, including all three tribes of the polyphyletic subfamily Pitcairnioideae (Brocchinieae, Puyeae and Pitcairnieae). The characteristic micropylar and chalazal seed appendages of Bromeliaceae are compared with developing ...
Sajo, M. Graça, Prychid, Christina J., Rudall, Paula J.   +2 more
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Genetic and Phenotypic Analysis of Ovule Development in Arabidopsis

2023
The plant seed is a remarkable structure that represents the single most important energy source in global diets. The stages of reproductive growth preceding seed formation are particularly important since they influence the number, size, and quality of seed produced. The progenitor of the seed is the ovule, a multicellular organ that produces a female
Dayton C, Bird, Chao, Ma, Sara, Pinto, Weng Herng, Leong, Matthew R, Tucker   +4 more
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Fetal development in cattle with multiple ovulations

Journal of Animal Science, 1992
Treatment of lactating and nonlactating parous cows (n = 379) with 12 mg of FSH-P to evaluate development of multiple bovine fetuses resulted in ovulation rates ranging from 1 to 27 corpora lutea (CL). Fertilization rate (i.e., ova fertilized at 6 to 8 d postmating, 80.0%) was not affected by ovulation rate.
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The Hormonal Control of Ovulation and Early Development

Postgraduate Medicine, 1958
(1958). The Hormonal Control of Ovulation and Early Development. Postgraduate Medicine: Vol. 24, No. 6, pp. 654-660.
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Development of ovule and seed in Rapateaceae

Botanical Journal of the Linnean Society, 1988
VENTURELLI, M. & BOUMAN, F., 1988. Development of ovule and seed in Rapateaceae. The structure of the ovules and/or seeds of twelve species of Rapateaceae were studied, some additional embryological characters also being recorded. The ovules are always anatropous, bitegmic and crassinucellate, but they differ in the shape, size and in thickness of the ...
MARGARIDA VENTURELLI, FERRY BOUMAN
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The molecular and genetic control of ovule development

Current Opinion in Plant Biology, 1999
A genetic approach has resulted in an extensive framework for the methodical analysis of ovule development. The most recent progress was accomplished in the areas of primordium formation and integument morphogenesis. Furthermore, systematic screens have identified a number of gametophytic mutations disrupting several distinct steps of embryo sac ...
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Gypsy embryo specifies ovule curvature by regulating ovule/integument development in rice

Planta, 2005
The embryo position in a seed is stable in most plant species, indicating the existence of a strict regulatory mechanism that specifies the embryo position in the seed. To elucidate this mechanism, we analyzed the gypsy embryo (gym) mutant of rice, in which the position of the mature embryo in the seed is altered at a low frequency.
S, Yamaki, H, Satoh, Y, Nagato
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