Sex determination in Actinidia. 1. Sex-linked markers and progeny sex ratio in diploid A. chinensis |
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Authors: | C F Harvey G P Gill L G Fraser M A McNeilage |
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Institution: | (1) The Horticulture and Food Research Institute of New Zealand Ltd., Mt. Albert Research Centre, Private Bag 92169, Auckland, New Zealand Fax +64 9 815 4201; e-mail mmcneilage@hort.cri.nz, NZ |
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Abstract: | First results from two strategies aimed at elucidating the genetics of sex in the dioecious genus Actinidia Lindl. (Actinidiaceae) support the hypothesis that sex-determining genes are localized in a pair of chromosomes which, although
cytologically indistinguishable, function like an XX/XY system with male heterogamety. A. chinensis Planch., a close relative of the kiwifruit A. deliciosa (A. Chev.) CF Liang et AR Ferguson], has diploid and tetraploid races. Bulk segregant analysis to find sex-linked markers
revealed two markers whose inheritance patterns in three diploid families showed X and Y linkage and indicated that the male
is the heterogametic sex. Some recombination between the markers and the sex-determining loci was also demonstrated. Sex ratios
in 12 progenies from controlled crosses varied around 1:1, as expected for an XX/XY system.
Received: 20 December 1995 / Revision accepted: 24 April 1997 |
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Keywords: | Actinidia Dioecism Sex determination Sex markers Sex ratios |
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