控制日本梨自交不亲和强度的花粉因子。

Sexual Plant Reproduction Pub Date : 2012-12-01 Epub Date: 2012-11-02 DOI:10.1007/s00497-012-0202-7
Shin Hiratsuka, Makoto Fujimura, Taishi Hayashida, Yutaka Nishikawa, Kazuyoshi Nada
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引用次数: 6

摘要

日本梨具有遗传控制的自交不亲和系统,但在半体内试验中花粉管生长和自花授粉后坐果在品种间差异较大。花柱中花粉管到达基部的比例为0 ~ 36%(由花柱离体培养确定),坐果的比例为0.6 ~ 15.2%。根据这些数据,我们对每个品种的自交不亲和弱值进行了赋值。本研究表明花粉因子控制着自交不亲和的程度。以完全亲和的‘后越’(S (1) S(7))花柱比较13个品种的花粉管生长,品种间差异较大,且与自交不亲和弱呈显著正相关(r = 0.707)。因此,梨的自交不亲和程度是由与s位点无关的花粉因子决定的。花粉供体对‘后越’坐果和果实生长无显著影响,但种子数与自交不亲和弱度呈显著正相关(r = 0.972)。而在不产生S- rnase的花柱(基因型:S (4) (sm) S (4) (sm))中,这种关系消失(r = 0.341),除1个品种外,花粉管生长促进率为12- 36%。这些结果表明,s - rnase对亲和性花粉起细胞毒素作用的方式依赖于品种,抑制程度取决于与s位点无关的花粉因子。花粉因子在不亲和花柱中也对S-RNase起作用,导致不同程度的自交不亲和。
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Pollen factors controlling self-incompatibility strength in Japanese pear.

Japanese pear has a genetically controlled self-incompatibility system, but both the pollen-tube growth in a semi in vivo assay and fruit set after self-pollination differ considerably among cultivars. The percentage of styles in which pollen tubes have reached the base ranges from 0 to 36 %, a value determined by culture of styles in vitro, and fruit set ranges from 0.6 to 15.2 %. Based on these data, we have assigned a value for the self-incompatibility weakness to each cultivar. Here, we showed that pollen factors control the degree of self-incompatibility. When the pollen-tube growth of 13 cultivars was compared in a completely compatible 'Hougetsu' (S (1) S (7)) style, it differed a fair amount among cultivars and showed a significantly positive relation to self-incompatibility weakness (r = 0.707). The degree of self-incompatibility of pear is, therefore, determined by pollen factor(s) unrelated to the S-locus. Although the fruit set and fruit growth of 'Hougetsu' were not affected by the pollen donor, a positive relationship was also observed between seed number and self-incompatibility weakness (r = 0.972). However, in a style with no S-RNase production (genotype: S (4) (sm) S (4) (sm) ), the relationship disappeared (r = 0.341) and pollen-tube growth was promoted by 12-36 % except in one cultivar. These results suggest that S-RNase functions as a cytotoxin on compatible pollen in a cultivar-dependent manner, and that the degree of inhibition is determined by pollen factor(s) unrelated to the S-locus. The pollen factor also functions on S-RNase in incompatible styles, resulting in a different degree of self-incompatibility.

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来源期刊
Sexual Plant Reproduction
Sexual Plant Reproduction 生物-生殖生物学
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