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Salt-tolerant and - sensitive alfalfa (Medicago sativa) cultivars have large variations in defense responses to the lepidopteran insect Spodoptera litura under normal and salt stress condition
Lei, Yunting1,2,3,4; Liu, Qing2,3; Hettenhausen, Christian4; Cao, Guoyan4; Tan, Qing4; Zhao, Weiye4; Lin, Honghui1; Wu, Jianqiang4
2017-07-18
Source PublicationPLOS ONE
ISSN1932-6203
Volume12Issue:7Pages:e0181589
AbstractIn nature, plants are often exposed to multiple stress factors at the same time. Yet, little is known about how plants modulate their physiology to counteract simultaneous abiotic and biotic stresses, such as soil salinity and insect herbivory. In this study, insect performance bioassays, phytohormone measurements, quantification of transcripts, and protein determination were employed to study the phenotypic variations of two alfalfa (Medicago sativa) cultivars in response to insect Spodoptera litura feeding under normal and salt stress condition. When being cultivated in normal soil, the salt-tolerant alfalfa cultivar Zhongmu-1 exhibited lower insect resistance than did the salt-sensitive cultivar Xinjiang Daye. Under salinity stress, the defense responses of Xinjiang Daye were repressed, whereas Zhongmu-1 did not show changes in resistance levels. It is likely that salinity influenced the resistance of Xinjiang Daye through suppressing the accumulation of jasmonic acid-isoleucine (JA-Ile), which is the bioactive hormone inducing herbivore defense responses, leading to attenuated trypsin proteinase inhibitor (TPI) activity. Furthermore, exogenous ABA supplementation suppressed the insect herbivory-induced JA/JA-Ile accumulation and levels of JAR1 (jasmonate resistant 1) and TPI, and further decreased the resistance of Xinjiang Daye, whereas Zhongmu-1 showed very little response to the increased ABA level. We propose a mechanism, in which high levels of abscisic acid induced by salt treatment may affect the expression levels of JAR1 and consequently decrease JA-Ile accumulation and thus partly suppress the defense of Xinjiang Daye against insects under salt stress. This study provides new insight into the mechanism by which alfalfa responds to concurrent abiotic and biotic stresses.
KeywordAbscisic-acid Salinity Stress Nicotiana-attenuata Induced Resistance Abiotic Stresses Gene-expression Plants Herbivores Arabidopsis Jasmonate
Subject AreaMultidisciplinary Sciences
DOI10.1371/journal.pone.0181589
Indexed BySCI
Language英语
WOS IDWOS:000406061400057
Citation statistics
Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/54943
Collection资源植物与生物技术所级重点实验室
Affiliation1.Sichuan Univ, Minist Educ, Coll Life Sci, State Key Lab Hydraul & Mt River Engn,Key Lab Bio, Chengdu, Sichuan, Peoples R China
2.Chinese Acad Sci, Key Lab Mt Ecol Restorat & Bioresource Utilizat, Chengdu Inst Biol, Chengdu, Sichuan, Peoples R China
3.Chinese Acad Sci, Ecol Restorat & Biodivers Conservat Key Lab Sichu, Chengdu Inst Biol, Chengdu, Sichuan, Peoples R China
4.Chinese Acad Sci, Dept Econ Plants & Biotechnol, Yunnan Key Lab Wild Plant Resources, Kunming Inst Bot, Kunming, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Lei, Yunting,Liu, Qing,Hettenhausen, Christian,et al. Salt-tolerant and - sensitive alfalfa (Medicago sativa) cultivars have large variations in defense responses to the lepidopteran insect Spodoptera litura under normal and salt stress condition[J]. PLOS ONE,2017,12(7):e0181589.
APA Lei, Yunting.,Liu, Qing.,Hettenhausen, Christian.,Cao, Guoyan.,Tan, Qing.,...&Wu, Jianqiang.(2017).Salt-tolerant and - sensitive alfalfa (Medicago sativa) cultivars have large variations in defense responses to the lepidopteran insect Spodoptera litura under normal and salt stress condition.PLOS ONE,12(7),e0181589.
MLA Lei, Yunting,et al."Salt-tolerant and - sensitive alfalfa (Medicago sativa) cultivars have large variations in defense responses to the lepidopteran insect Spodoptera litura under normal and salt stress condition".PLOS ONE 12.7(2017):e0181589.
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