LowTemperature-Induced30 (LTI30)positively regulates drought stress resistance in Arabidopsis:effect on abscisic acid sensitivity and hydrogen peroxide accumulation

作   者：施海涛，陈银华, 钱永强(共同一作），产祝龙
期刊名称：Front. PlantSci.
影响因子：4.298
卷 期 号：6
页     码：893
关键词：LowTemperature-Induced30,abscisicacid,hydrogenperoxide,droughtstress,reactiveoxygenspecies,Arabidopsis
论文摘要：
As a dehydrin belonging to group II late embryogenesis abundant protein (LEA)
family, Arabidopsis Low Temperature-Induced 30 (LTI30)/XERO2 has been shown to
be involved in plant freezing stress resistance. However, the other roles of AtLTI30
remain unknown. In this study, we found that the expression of AtLTI30 was largely
induced by drought stress and abscisic acid (ABA) treatments. Thereafter, AtLTI30
knockout mutants and overexpressing plants were isolated to investigate the possible
involvement of AtLTI30 in ABA and drought stress responses. AtLTI30 knockout mutants
were less sensitive to ABA-mediated seed germination, while AtLTI30 overexpressing
plants were more sensitive to ABA compared with wild type (WT). Consistently, the
AtLTI30 knockout mutants displayed decreased drought stress resistance, while the
AtLTI30 overexpressing plants showed improved drought stress resistance compared
with WT, as evidenced by a higher survival rate and lower leaf water loss than WT after
drought stress. Moreover, manipulation of AtLTI30 expression positively regulated the
activities of catalases (CATs) and endogenous proline content, as a result, negatively
regulated drought stress-triggered hydrogen peroxide (H2O2) accumulation. All these
results indicate that AtLTI30 is a positive regulator of plant drought stress resistance,
partially through the modulation of ABA sensitivity, H2O2 and proline accumulation.