Jasmonic acid is required for plant acclimation to a combination of high light and heat stress

编号 040021403

推送时间 20191125

研究领域 森林培育 

年份 2019 

类型 期刊 

语种 英语

标题 Jasmonic acid is required for plant acclimation to a combination of high light and heat stress

来源期刊 Plant Physiology

期 第214期

发表时间 20191008

关键词 Jasmonic acid;  heat stress;  high light stress;  plant acclimation; 

摘要 In the field, plants experience high light intensities that are often accompanied by elevated temperatures. Such conditions are a serious threat to agriculture production, since photosynthesis is highly sensitive to both high light intensities and high-temperature stress. One of the potential cellular targets of high light and heat stress combination is photosystem II (PSII) because its degree of photoinhibition depends on the balance between the rate of PSII damage (induced by light stress), and the rate of PSII repair (impaired under heat stress). Here, we studied the responses of Arabidopsis thaliana plants to a combination of high light and heat stress conditions. Combined high light and heat stress was accompanied by irreversible damage to PSII, decreased D1 (PsbA) protein levels, and an enhanced transcriptional response indicative of PSII repair activation. We further identified several unique aspects of this stress combination that included enhanced accumulation of jasmonic acid (JA) and JA-isoleucine (JA-Ile), elevated expression of over 2200 different transcripts that are unique to the stress combination (including many that are JA-associated), and distinctive structural changes to chloroplasts. A mutant deficient in JA biosynthesis (allene oxide synthase; aos) displayed enhanced sensitivity to combined high light and heat stress and further analysis revealed that JA is required for regulating several transcriptional responses unique to the stress combination. Our study reveals that JA plays an important role in the acclimation of plants to a combination of high light and heat stress.

服务人员 孙小满

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