作为花粉S决定者的S位点F盒蛋白准非自我S-RNase,这是类植物自身不相容性的基础
Zong-Hong Cao1, Dan Song1, Yu Hu1
1National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, China.
Journal of experimental botany
|March 15, 2024
概括
果中的自我不相容性 (SI) 阻止了自我受精. 这项研究提供了直接证据,S-locus F-box (SLF) 蛋白质控制花粉功能,作为非自我识别系统中的花粉决定因素.
科学领域:
- 植物生殖生物学 植物生殖生物学
- 分子遗传学 分子遗传学
- 基因组学就是基因组学.
背景情况:
- 自我不相容性 (SI) 是一种防止开花植物自我受精的遗传机制.
- 花SI受S-locus的控制,包括S-RNase (型决定性) 和多个S-locus F-box (SLF) 基因 (假定花粉决定性).
- 缺乏SLF基因作为果中的花粉决定因素的直接证据.
研究的目的:
- 为SLF基因作为花粉决定因素在类植物自我不相容性中的作用提供直接证据.
- 调查在Citrus SI系统中非自我识别背后的分子机制.
主要方法:
- 两个梅罗 (Citrus grandis) 植物的基因组组合.
- 孤立和注释S半型和SLF等位基因.
- 对SLF基因的遗传学分析.
- 使用"迷你" (Fortunella hindsii) 的转变实验进行功能验证.
- 在CgSSK1蛋白的体外相互作用测试.
主要成果:
- 确定了三个新的,完整的S半型和36个SLF/SLF类等位基因.
- 遗传学分析将138种SLF分为12种类型.
- 转换实验表明,S6-SLF7a通过识别非自我S8-RNase来诱导自我兼容性.
- 在体外试验证实了SLF与CgSSK1蛋白的相互作用.
结论:
- SLF蛋白直接控制果中的花粉功能,作为花粉S决定因素.
- 这项研究验证了SLF在Citrus中的"非自我识别"SI系统中的作用.
- 这些发现有助于我们更好地了解果树中SI机制.
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