Polyembryony
Mostrando 13-18 de 18 artigos, teses e dissertações.
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13. Identification of zygotic and nucelar seed embryos and agronomic and molecular characterization of Ubá mango tree accesses / Identificação de embriões zigóticos e nucelares de sementes e caracterização agronômica e molecular de acessos de mangueira Ubá
The objectives of this work were to identify using ISSR molecular markers, the genetic origin, whether zygotic or nucelar, of seedlings relating to their vigor; to characterize the fruit physically and chemically and to evaluate the genetic diversity of Ubá mango tree accesses sampled in Visconde do Rio Branco, Viçosa and Ubá, based on phenotypic and geno
Publicado em: 2009
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14. Polyembryony in angiospermous trees of the Brazilian Cerrado and Caatinga vegetation
A ocorrência de poliembrionia foi investigada em 75 espécies lenhosas do Cerrado do Brasil central e da Caatinga xerófila do nordeste brasileiro. Quatorze espécies apresentaram poliembrionia, uma modalidade de reprodução anômala em angiospermas. Poliembrionia é relatada pela primeira vez para nove gêneros, Astronium, Byrsonima, Cariniana, Copaifera,
Acta Botanica Brasilica. Publicado em: 2001-12
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15. In Vitro Fertilization with Isolated, Single Gametes Results in Zygotic Embryogenesis and Fertile Maize Plants.
We demonstrate here the possibility of regenerating phenotypically normal, fertile maize plants via in vitro fertilization of isolated, single sperm and egg cells mediated by electrofusion. The technique leads to the highly efficient formation of polar zygotes, globular structures, proembryos, and transition-phase embryos and to the formation of plants from
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16. Embryo Sac Development in the Maize indeterminate gametophyte1 Mutant: Abnormal Nuclear Behavior and Defective Microtubule Organization.
The indeterminate gametophyte1 mutation in maize has been known to disrupt development of the female gametophyte. Mutant embryo sacs have abnormal numbers and behavior of micropylar and central cell nuclei, which result in polyembryony and elevated ploidy levels in the endosperm of developing kernels. In this study, we confirm abnormal nuclear behavior and p
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17. Polyembryony in Citrus. Accumulation of seed storage proteins in seeds and in embryos cultured in vitro.
Citrus exhibits polyembryonic seed development, an apomictic process in which many maternally derived embryos arise from the nucellus surrounding the developing zygotic embryo. Citrus seed storage proteins were used as markers to compare embryogenesis in developing seeds and somatic embryogenesis in vitro. The salt-soluble, globulin protein fraction (designa
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18. Suspensor-derived polyembryony caused by altered expression of valyl-tRNA synthetase in the twn2 mutant of Arabidopsis
The twn2 mutant of Arabidopsis exhibits a defect in early embryogenesis where, following one or two divisions of the zygote, the decendents of the apical cell arrest. The basal cells that normally give rise to the suspensor proliferate abnormally, giving rise to multiple embryos. A high proportion of the seeds fail to develop viable embryos, and those that d
The National Academy of Sciences of the USA.