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首頁> 美國衛(wèi)生研究院文獻(xiàn)>Journal of Experimental Botany >Light-harvesting chlorophyll a/b-binding proteins are required for stomatal response to abscisic acid in Arabidopsis
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Light-harvesting chlorophyll a/b-binding proteins are required for stomatal response to abscisic acid in Arabidopsis

機(jī)譯：擬南芥氣孔對(duì)脫落酸的氣孔響應(yīng)需要光采葉綠素a / b結(jié)合蛋白

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摘要

The light-harvesting chlorophyll a/b binding proteins (LHCB) are perhaps the most abundant membrane proteins in nature. It is reported here that the down-regulation or disruption of any member of the LHCB family, LHCB1, LHCB2, LHCB3, LHCB4, LHCB5, or LHCB6, reduces responsiveness of stomatal movement to ABA, and therefore results in a decrease in plant tolerance to drought stress in Arabidopsis thaliana. By contrast, over-expression of a LHCB member, LHCB6, enhances stomatal sensitivity to ABA. In addition, the reactive oxygen species (ROS) homeostasis and a set of ABA-responsive genes are altered in the lhcb mutants. These data demonstrate that LHCBs play a positive role in guard cell signalling in response to ABA and suggest that they may be involved in ABA signalling partly by modulating ROS homeostasis.
機(jī)譯：集光的葉綠素a / b結(jié)合蛋白（LHCB）可能是自然界中最豐富的膜蛋白。據(jù)報(bào)道，LHCB家族的任何成員，LHCB1，LHCB2，LHCB3，LHCB4，LHCB5或LHCB6的下調(diào)或破壞都會(huì)降低氣孔運(yùn)動(dòng)對(duì)ABA的反應(yīng)性，因此導(dǎo)致植物對(duì)ABA的耐受性降低擬南芥的干旱脅迫。相比之下，LHCB成員LHCB6的過度表達(dá)增強(qiáng)了對(duì)ABA的氣孔敏感性。此外，在lhcb突變體中，活性氧（ROS）穩(wěn)態(tài)和一組ABA反應(yīng)基因發(fā)生了改變。這些數(shù)據(jù)表明，LHCB在響應(yīng)ABA的保衛(wèi)細(xì)胞信號(hào)傳導(dǎo)中發(fā)揮積極作用，并表明它們可能部分地通過調(diào)節(jié)ROS穩(wěn)態(tài)而參與ABA信號(hào)傳導(dǎo)。

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