Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 325852
Title The occurrence of phenotypically complementary apomixis-recombinants in crosses between sexual and apomictic dandelions ( Taraxacum officinale ).
Author(s) Dijk, P.J.; Baarlen, P. van; Jong, J.H.S.G.M. de
Source Sexual Plant Reproduction 16 (2003). - ISSN 0934-0882 - p. 71 - 76.
Department(s) Laboratory of Phytopathology
Laboratory of Genetics
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) fertilization - arabidopsis - agamospermy - inheritance
Abstract Apomictic seed development in dandelion (Taraxacum officinale) involves (1) restitutional meiosis (diplospory), (2) egg cell parthenogenesis, and (3) autonomous endosperm development. The question is whether these elements of apomixis are controlled by one single gene or by several independent genes. Five triploid non-apomictic hybrids, obtained in diploid sexual x triploid apomict crosses were characterized using cyto-embryological and genetic methods. Nomarski-differential interference contrast microscopy and the transmission of microsatellite markers and ploidy levels indicated that the hybrids combined elements of the apomictic and the sexual developmental pathway. Hybrids form two complementary groups with respect to the presence or absence of parthenogenesis and autonomous endosperm development. The occurrence of complementary apomixis-recombinants suggests that parthenogenesis and autonomous endosperm development in Taraxacum are regulated independently by different genes. This study also indicates that early embryo development is independent of endosperm formation, but that endosperm is essential for later embryo growth.
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