Ultrastructural Aspects on Degeneration of Embryo, Endosperm and Suspensor Cells following Interspecific Crosses in the Genus Fagopyrum

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概要

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• Degeneration of embryo, endosperm and suspensor cells in hybrid embryo at 1 to 5 days after interspecific cross pollination in the genus Fagopyrum were studied by using a light microscope and transmission electron microscope (TEM) to determine the nature of the post-fertilization barriers of interspecific hybridization in buckwheat. In comparison with the self-pollinated or legitimate-pollinated embryo, interspecific hybrid embryos showed various post-fertilization ultrastructural abnormal phenomena such as failure of endosperm development, vacuolated embryo cells with degenerated endosperm, degeneration of embryo, endosperm and suspensor cells. Both endosperm and suspensor cells were degenerated. Their degeneration may lead to the loss of normal endosperm nourishing and failure of nutrient transport to the developing embryo and thus may trigger off the observed embryo abortion. Comparatively fewer abnormalities occurred in the hybrid embryo of the cross between F. cymosum and F. esculentum than in that between F. tataricum and F. esculentum. This indicates that the cross combination F. cymosum × F. esculentum may be considered as a breeding material in buckwheat hybridization. The deficiency and degeneration of endosperm that were observed at 2 to 3 DAP may lead to the degradation of hybrid embryo. Therefore, rescue of hybrid embryos at this critical stage (2-3 DAP) by ovule culture may overcome one of the main post fertilization barriers.

• 日本育種学会の論文

著者

• Adachi Taiji

  Laboratory Of Plant Genes And Physiology Division Of Agricultural And Environmental Sciences Graduat

• Guan Li-ming

  Faculty Of Agriculure Miyazaki University

• Shaikh Nilufar

  Laboratory Of Plant Genes And Physiology Division Of Agricultural And Environmental Sciences Graduat

関連論文

• Breeding Barriers in the Interspecific Cross of Oryza sativa L.and Oryza minuta Presl.
• Ultrastructural Aspects on Degeneration of Embryo, Endosperm and Suspensor Cells following Interspecific Crosses in the Genus Fagopyrum
• Abnormal Embryo Development and Efficient Embryo Rescue in Interspecific Hybrids, Oryza sativa × O. minuta and O. sativa × O. officinalis
• Failure of Fertilization Associated with Absence of Zygote Development in the Interspecific Cross of Fagopyrum tataricum × F. esculentum
• Inheritance and Characterization of a Null Allele for Group A Acetyl Saponins found in a Mutant Soybean (Glycine max (L.) Merrill)
• Conversion of AFLP Markers Linked to the S^h Allele at the S Locus in Buckwheat to a Simple PCR Based Marker Form

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