DELAY OF GERMINATION1 requires PP2C phosphatases of the ABA signalling pathway to control seed dormancy.
DELAY OF GERMINATION1 requires PP2C phosphatases of the ABA signalling pathway to control seed dormancy.
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DOI：
10.1038/s41467-017-00113-6
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发表时间：
2017-07-13
影响因子：
16.6
通讯作者：
Soppe WJJ
中科院分区：
文献类型：
--
作者：
Née G;Kramer K;Nakabayashi K;Yuan B;Xiang Y;Miatton E;Finkemeier I;Soppe WJJ
种子萌发的时间是植物生命中决定未来生长和发育的主要决定点。这个时间是由种子休眠控制的，种子休眠会阻止在有利条件下发芽。植物激素脱落酸（阿坝）和蛋白质萌发延迟1（DOG 1）是休眠的重要调节剂。阿坝在休眠中的作用已相当清楚，但DOG 1的作用仍不清楚。在这里，我们描述了四个磷酸酶与DOG 1在种子中相互作用。其中两个属于2C型蛋白磷酸酶的进化枝A：ABA-超敏萌发1（AHG 1）和AHG 3。这些磷酸酶在种子休眠的解除中具有冗余但必不可少的作用，对DOG 1具有上位性。我们建议，阿坝和DOG 1休眠途径收敛在2C型蛋白磷酸酶的进化枝A。DOG 1蛋白是拟南芥种子休眠的主要调节因子。在这里，Née等人提供的证据表明，DOG 1可以与2C型蛋白磷酸酶AHG 1和AHG 3相互作用，这代表了DOG 1调节的休眠途径和植物激素脱落酸信号传导的收敛点。
The time of seed germination is a major decision point in the life of plants determining future growth and development. This timing is controlled by seed dormancy, which prevents germination under favourable conditions. The plant hormone abscisic acid (ABA) and the protein DELAY OF GERMINATION 1 (DOG1) are essential regulators of dormancy. The function of ABA in dormancy is rather well understood, but the role of DOG1 is still unknown. Here, we describe four phosphatases that interact with DOG1 in seeds. Two of them belong to clade A of type 2C protein phosphatases: ABA-HYPERSENSITIVE GERMINATION 1 (AHG1) and AHG3. These phosphatases have redundant but essential roles in the release of seed dormancy epistatic to DOG1. We propose that the ABA and DOG1 dormancy pathways converge at clade A of type 2C protein phosphatases. The DOG1 protein is a major regulator of seed dormancy in Arabidopsis. Here, Née et al. provide evidence that DOG1 can interact with the type 2C protein phosphatases AHG1 and AHG3 and that this represents the convergence point of the DOG1-regulated dormancy pathway and signalling by the plant hormone abscisic acid.