Vascular and nonvascular transmission of systemic reactive oxygen signals during wounding and heat stress

编号 040031105

推送时间 20211004

研究领域 森林培育 

年份 2021 

类型 期刊 

语种 英语

标题 Vascular and nonvascular transmission of systemic reactive oxygen signals during wounding and heat stress

来源期刊 Plant Physiology

期 第311期

发表时间 20210405

关键词 heat stress;  Arabidopsis thaliana;  high light (HL);  reactive oxygen species (ROS); 

摘要 Sensing of heat, high light (HL), or mechanical injury by a single leaf of a plant results in the activation of different systemic signals that reach systemic tissues within minutes and trigger systemic acquired acclimation (SAA) or systemic wound responses (SWRs), resulting in a heightened state of stress readiness of the entire plant. Among the different signals associated with rapid systemic responses to stress in plants are electric, calcium, and reactive oxygen species (ROS) waves. These signals propagate from the stressed or injured leaf to the rest of the plant through the plant vascular bundles, and trigger SWRs and SAA in systemic tissues. However, whether they can propagate through other cell types, and whether or not they are interlinked, remain open questions. Here we report that in response to wounding or heat stress (HS), but not HL stress, the ROS wave can propagate through mesophyll cells of Arabidopsis (Arabidopsis thaliana). Moreover, we show that ROS production by mesophyll cells during these stresses is sufficient to restore SWR and SAA transcript accumulation in systemic leaves, as well as SAA to HS (but not HL). We further show that propagation of the ROS wave through mesophyll cells could contribute to systemic signal integration during HL and HS stress combination. Our findings reveal that the ROS wave can propagate through tissues other than the vascular bundles of plants, and that different stresses can trigger different types of systemic signals that propagate through different cell layers and induce stress-specific systemic responses.

服务人员 孙小满

服务院士 尹伟伦

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