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小百草枯抗性蛋白调节百草枯和脱落酸反应，并赋予过表达拟南芥植株耐旱性。

Small paraquat resistance proteins modulate paraquat and ABA responses and confer drought tolerance to overexpressing Arabidopsis plants.

作者信息

Faragó Dóra, Zsigmond Laura, Benyó Dániel, Alcazar Rubén, Rigó Gábor, Ayaydin Ferhan, Rabilu Sahilu Ahmad, Hunyadi-Gulyás Éva, Szabados László

机构信息

Institute of Plant Biology, Biological Research Centre, Szeged, Hungary.

Facultat de Farmàcia, Universitat de Barcelona, Barcelona, Spain.

出版信息

Plant Cell Environ. 2022 Jul;45(7):1985-2003. doi: 10.1111/pce.14338. Epub 2022 Apr 29.

DOI:10.1111/pce.14338
PMID:35486392
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9324991/
Abstract

Adaptation of higher plants to extreme environmental conditions is under complex regulation. Several small peptides have recently been described to modulate responses to stress conditions. The Small Paraquat resistance protein (SPQ) of Lepidium crassifolium has previously been identified due to its capacity to confer paraquat resistance to overexpressing transgenic Arabidopsis plants. Here, we show that overexpression of the closely related Arabidopsis SPQ can also enhance resistance to paraquat, while the Arabidopsis spq1 mutant is slightly hypersensitive to this herbicide. Besides being implicated in paraquat response, overexpression of SPQs enhanced sensitivity to abscisic acid (ABA), and the knockout spq1 mutant was less sensitive to ABA. Both Lepidium- and Arabidopsis-derived SPQs could improve drought tolerance by reducing water loss, stabilizing photosynthetic electron transport and enhancing plant viability and survival in a water-limited environment. Enhanced drought tolerance of SPQ-overexpressing plants could be confirmed by characterizing various parameters of growth, morphology and photosynthesis using an automatic plant phenotyping platform with RGB and chlorophyll fluorescence imaging. Our results suggest that SPQs can be regulatory small proteins connecting ROS and ABA regulation and through that influence responses to certain stresses.

摘要

高等植物对极端环境条件的适应受到复杂的调控。最近有几种小肽被描述可调节对胁迫条件的反应。粗叶独行菜的小百草枯抗性蛋白（SPQ）先前已被鉴定，因为它能够赋予过表达转基因拟南芥植物百草枯抗性。在这里，我们表明，密切相关的拟南芥SPQ的过表达也能增强对百草枯的抗性，而拟南芥spq1突变体对这种除草剂略微敏感。除了参与百草枯反应外，SPQs的过表达还增强了对脱落酸（ABA）的敏感性，而敲除spq1突变体对ABA的敏感性较低。来自独行菜和拟南芥的SPQs都可以通过减少水分流失、稳定光合电子传递以及增强在水分有限环境中的植物活力和存活率来提高耐旱性。使用具有RGB和叶绿素荧光成像的自动植物表型平台对生长、形态和光合作用的各种参数进行表征，可以证实过表达SPQ的植物耐旱性增强。我们的结果表明，SPQs可能是连接ROS和ABA调控的调节性小蛋白，并通过这种方式影响对某些胁迫的反应。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/78f53c975d17/PCE-45-1985-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/861702e89b67/PCE-45-1985-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/7027cd57c3b3/PCE-45-1985-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/327e21ce7076/PCE-45-1985-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/78f53c975d17/PCE-45-1985-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/861702e89b67/PCE-45-1985-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/9dc1d4ea62a4/PCE-45-1985-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/0cc4cbdcfb77/PCE-45-1985-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/1de9e71bf778/PCE-45-1985-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/f9d0e2acad9c/PCE-45-1985-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/99b573dad4cb/PCE-45-1985-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/8d103175e530/PCE-45-1985-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/7027cd57c3b3/PCE-45-1985-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/650a/9324991/327e21ce7076/PCE-45-1985-g009.jpg
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