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Peptide signaling for drought-induced tomato flower drop
Science ( IF 44.7 ) Pub Date : 2020-03-26 , DOI: 10.1126/science.aaz5641
S. Reichardt 1 , H.-P. Piepho 2 , A. Stintzi 1 , A. Schaller 1
Affiliation  

Fruit abscission in response to drought Plants faced with drought, or simply not quite enough water, may be more likely to drop their fruit prematurely. Reichardt et al. found that a small signaling peptide hormone, phytosulfokine, which was previously known for its ability to regulate plant cell growth, also drives fruit abscission. Processed, and thus activated, by a subtilisin-like protease, phytosulfokine in turn drives expression of the hydrolases that degrade the cell walls in the abscission zone, leading to dropped fruit. Science, this issue p. 1482 A protease processes the peptide signal that drives water-deprived tomato plants to jettison their flowers and fruit. 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.

中文翻译:

干旱引起的番茄花落的肽信号传导

干旱导致果实脱落 面临干旱或水量不足的植物可能更有可能过早地掉下果实。Reichardt 等人。发现一种小的信号肽激素,植物磺化因子,以前以其调节植物细胞生长的能力而闻名,也会导致果实脱落。被枯草杆菌蛋白酶样蛋白酶处理并因此被激活,植物磺化因子反过来驱动水解酶的表达,这些水解酶降解脱落区的细胞壁,导致落果。科学,这个问题 p。1482 蛋白酶处理肽信号,促使缺水的番茄植株抛弃花朵和果实。花果过早脱落限制了环境胁迫下的作物产量。番茄植物中干旱引起的落花被发现受植物磺化因子 (PSK) 的调节,PSK 是一种以前以其促进生长和免疫调节活性而闻名的肽激素。响应干旱胁迫的 PSK 形成取决于植酸酶 2,这是一种枯草杆菌蛋白酶亚型的枯草杆菌蛋白酶,通过对番茄花梗中的 PSK 前体进行天冬氨酸特异性加工来产生肽激素。成熟肽在脱落区起作用,在那里它诱导执行脱落过程的细胞壁水解酶的表达。我们的结果提供了对脱落的分子控制的深入了解,该控制由蛋白水解加工调节以产生小植物肽激素。响应干旱胁迫的 PSK 形成取决于植酸酶 2,这是一种枯草杆菌蛋白酶亚型的枯草杆菌蛋白酶,通过对番茄花梗中的 PSK 前体进行天冬氨酸特异性加工来产生肽激素。成熟肽在脱落区起作用,在那里它诱导执行脱落过程的细胞壁水解酶的表达。我们的结果提供了对脱落的分子控制的深入了解,该控制由蛋白水解加工调节以产生小植物肽激素。响应干旱胁迫的 PSK 形成取决于植酸酶 2,这是一种枯草杆菌蛋白酶亚型的枯草杆菌蛋白酶,通过对番茄花梗中的 PSK 前体进行天冬氨酸特异性加工来产生肽激素。成熟肽在脱落区起作用,在那里它诱导执行脱落过程的细胞壁水解酶的表达。我们的结果提供了对脱落的分子控制的深入了解,该控制由蛋白水解加工调节以产生小植物肽激素。成熟肽在脱落区起作用,在那里它诱导执行脱落过程的细胞壁水解酶的表达。我们的结果提供了对脱落的分子控制的深入了解,该控制由蛋白水解加工调节以产生小植物肽激素。成熟肽在脱落区起作用,在那里它诱导执行脱落过程的细胞壁水解酶的表达。我们的结果提供了对脱落的分子控制的深入了解,该控制由蛋白水解加工调节以产生小植物肽激素。
更新日期:2020-03-26
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