Infection with an asymptomatic virus in rice results in a delayed drought response
Infection with an asymptomatic virus in rice results in a delayed drought response
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水稻感染无症状病毒导致干旱反应延迟
DOI：
10.1071/fp19241
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发表时间：
2020
影响因子：
3
通讯作者：
Choi Il-Ryong
中科院分区：
文献类型：
--
作者：
Encabo Jaymee R.;Macalalad-Cabral Reena Jesusa A.;Matres Jerlie Mhay K.;Coronejo Sapphire Charlene Thea P.;Jonson Gilda B.;Kishima Yuji;Henry Amelia;Choi Il-Ryong
植物中病毒的感染经常改变植物对生物和非生物胁迫的反应。本文研究了水稻东格鲁球形病毒（RTSV）感染对水稻干旱反应的影响。RTSV感染延迟叶片卷曲的开始1-2天。在干旱反应延迟期间，RTSV感染的植株在干旱条件下表现出比未感染植株更高的气孔导度和更小的负叶水势，表明RTSV感染的叶片更水合。其他生长和生理性状的植物在干旱条件下不受RTSV感染改变。干旱响应相关转录因子基因的表达分析显示，在RTSV感染的植物中，OsNAC 6和OsDREB 2a的表达被干旱激活的程度低于未感染的植物，进一步表明由于RTSV感染，植物的水分状况得到改善。RTSV在干旱条件下的植株中的积累量高于在充分供水条件下的植株，表明干旱增加了水稻植株对RTSV感染的敏感性。这些结果表明，RTSV感染可以通过增加叶片含水量来暂时缓解干旱胁迫对水稻的影响，而干旱则增加了水稻对RTSV的敏感性。
Infection of viruses in plants often modifies plant responses to biotic and abiotic stresses. In the present study we examined the effects of Rice tungro spherical virus (RTSV) infection on drought response in rice. RTSV infection delayed the onset of leaf rolling by 1–2 days. During the delay in drought response, plants infected with RTSV showed higher stomatal conductance and less negative leaf water potential under drought than those of uninfected plants, indicating that RTSV-infected leaves were more hydrated. Other growth and physiological traits of plants under drought were not altered by infection with RTSV. An expression analysis of genes for drought response-related transcription factors showed that the expression of OsNAC6 and OsDREB2a was less activated by drought in RTSV-infected plants than in uninfected plants, further suggesting improved water status of the plants due to RTSV infection. RTSV accumulated more in plants under drought than in well-watered plants, indicating the increased susceptibility of rice plants to RTSV infection by drought. Collectively, these results indicated that infection with RTSV can transiently mitigate the influence of drought stress on rice plants by increasing leaf hydration, while drought increased the susceptibility of rice plants to RTSV.