蔷薇科花粉表达的F-box基因家族及其基于s - rase的配子体自交不亲和机制

Sexual Plant Reproduction Pub Date : 2010-03-01 Epub Date: 2009-08-30 DOI:10.1007/s00497-009-0111-6
Hidenori Sassa, Hiroyuki Kakui, Mai Minamikawa
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引用次数: 77

摘要

蔷薇科、茄科和车前草科的许多物种都表现出基于S- rnase的自交不亲和性(SI),其中雌蕊部分特异性由S位点编码核糖核酸酶(S- rnase)控制。尽管最近的研究结果表明,S基因座编码的F-box蛋白SLF/SFB决定了花粉部分的特异性,但这些雌蕊和花粉部分S基因座产物如何在体内相互作用并引发SI反应在很大程度上尚不清楚。此外,遗传学研究表明,花粉的功能在不同物种之间可能存在差异。在茄科和蔷薇科Maloideae亚科(如苹果和梨)中,花粉中两个不同的花粉S等位基因共存会破坏花粉的SI,这种现象被称为竞争相互作用。然而,在蔷薇科的樱桃亚科(如樱桃和杏仁)中似乎没有竞争相互作用。此外,花粉S缺失的影响似乎在不同的分类群中有所不同。本文综述了蔷薇科、花蔷薇科和花蔷薇科花粉部分功能的潜在差异,并讨论了基于s - rase的SI机制分化的意义。
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Pollen-expressed F-box gene family and mechanism of S-RNase-based gametophytic self-incompatibility (GSI) in Rosaceae.

Many species of Rosaceae, Solanaceae, and Plantaginaceae exhibit S-RNase-based self-incompatibility (SI) in which pistil-part specificity is controlled by S locus-encoded ribonuclease (S-RNase). Although recent findings revealed that S locus-encoded F-box protein, SLF/SFB, determines pollen-part specificity, how these pistil- and pollen-part S locus products interact in vivo and elicit the SI reaction is largely unclear. Furthermore, genetic studies suggested that pollen S function can differ among species. In Solanaceae and the rosaceous subfamily Maloideae (e.g., apple and pear), the coexistence of two different pollen S alleles in a pollen breaks down SI of the pollen, a phenomenon known as competitive interaction. However, competitive interaction seems not to occur in the subfamily Prunoideae (e.g., cherry and almond) of Rosaceae. Furthermore, the effect of the deletion of pollen S seems to vary among taxa. This review focuses on the potential differences in pollen-part function between subfamilies of Rosaceae, Maloideae, and Prunoideae, and discusses implications for the mechanistic divergence of the S-RNase-based SI.

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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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