Peptide signaling for drought-induced tomato flower drop
Peptide signaling for drought-induced tomato flower drop
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DOI：
10.1126/science.aaz5641
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发表时间：
2020-03-27
期刊：
影响因子：
56.9
通讯作者：
Schaller, A.
中科院分区：
文献类型：
--
作者：
Reichardt, S.;Piepho, H. -P.;Schaller, A.
在环境胁迫下，花果过早脱落限制了作物产量。番茄植株受干旱诱导的落花受到植物硫酸盐(PSK)的调节，PSK是一种多肽激素，具有促进生长和免疫调节的活性。响应干旱胁迫的PSK的形成依赖于植酸酶2，这是一种植酸酶亚型的类枯草杆菌蛋白，它通过对番茄花梗中的PSK前体进行天冬氨酸特异性处理来产生多肽激素。成熟的多肽作用于离层，在那里它诱导执行离层过程的细胞壁水解酶的表达。我们的结果为通过蛋白分解过程产生一种小的植物多肽激素来调节脱落的分子控制提供了洞察力。
The premature abscission of flowers and fruits limits crop yield under environmental stress. Drought-induced flower drop in tomato plants was found to be regulated by phytosulfokine (PSK), a peptide hormone previously known for its growth-promoting and immune-modulating activities. PSK formation in response to drought stress depends on phytaspase 2, a subtilisin-like protease of the phytaspase subtype that generates the peptide hormone by aspartate-specific processing of the PSK precursor in the tomato flower pedicel. The mature peptide acts in the abscission zone where it induces expression of cell wall hydrolases that execute the abscission process. Our results provide insight into the molecular control of abscission as regulated by proteolytic processing to generate a small plant peptide hormone.