Genetic analysis of novel intra-species unilateral incompatibility in Brassica rapa (syn. campestris) L.
Genetic analysis of novel intra-species unilateral incompatibility in Brassica rapa (syn. campestris) L.
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DOI：
10.1007/s00497-004-0235-7
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发表时间：
2005-02-01
影响因子：
--
通讯作者：
Watanabe, M
中科院分区：
文献类型：
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作者：
Takada, Y;Nakanowatari, T;Watanabe, M
植物已经进化出许多系统来防止不适当的受精。其中，不亲和性是指雌蕊中花粉萌发或花粉管生长受到抑制的一个组织良好的系统。自交不亲和性（SI），排斥自花花粉，促进开花植物的远交繁殖。另一方面，物种间不亲和性，阻止物种间的基因流动以限制远系繁殖，通常发生在单侧，被称为单侧不亲和性（UI）。在菊科植物中，尽管参与自花花粉识别的S位点基因已在SI系统中得到表征，但对UI的分子机制知之甚少。在本研究中，我们的特点是新的UI之间观察到的成员相同的物种，芜菁;花粉土耳其SI线是专门拒绝了雌蕊的日本商业SI品种'Osome'。这种种内UI的不相容表型与SI非常相似。分离分析表明，该UI的花粉因子不与S-位点连锁。
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.