Genetic analysis of novel intra-species unilateral incompatibility in Brassica rapa (syn. campestris) L. |
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Authors: | Yoshinobu Takada Takayuki Nakanowatari Jun Sato Katsunori Hatakeyama Tomohiro Kakizaki Akiko Ito Go Suzuki Hiroshi Shiba Seiji Takayama Akira Isogai Masao Watanabe |
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Institution: | (1) Laboratory of Plant Breeding, Faculty of Agriculture, Iwate University, Iwate Morioka, 020-8550, Japan;(2) Department of Leaf and Root Vegetables, National Institute of Vegetable and Tea Science, Mie Ano, 514-2392, Japan;(3) Division of Natural Science, Osaka Kyoiku University, Osaka Kashiwara, 582-8582, Japan;(4) Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara Ikoma, 630-0101, Japan;(5) Present address: Iwate Biotechnology Research Center, Kitakami, 024-0003, Japan |
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Abstract: | Plants have evolved many systems to prevent inappropriate fertilization. Among them, incompatibility is a well-organized system in which pollen germination or pollen-tube growth is inhibited in pistils. Self-incompatibility (SI), rejecting self-pollen, promotes outbreeding in flowering plants. On the other hand, inter-species incompatibility, preventing gene flow among species to restrict outbreeding, usually occurs unilaterally, and is known as unilateral incompatibility (UI). In Brassicaceae, little is known about the molecular mechanism of UI, although S-locus genes involved in recognition of self-pollen have been characterized in the SI system. In the present study, we characterized novel UI observed between members of the same species, Brassica rapa; pollen of Turkish SI lines was specifically rejected by pistils of the Japanese commercial SI variety Osome . The incompatible phenotype of this intra-species UI closely resembled that of SI. Segregation analysis revealed that the pollen factor of this UI was not linked to the S-locus.The revised version was published online in December 2004 with corrections to figure 1. |
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Keywords: | Brassica rapa (syn campestris) L Intra-species incompatibility Pollen-stigma interaction Self-incompatibility Unilateral incompatibility |
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