Journal
PLANT JOURNAL
Volume 70, Issue 5, Pages 831-844Publisher
WILEY
DOI: 10.1111/j.1365-313X.2012.04932.x
Keywords
abscisic acid; Arabidopsis; drought stress; leaf senescence; NAM; ATAF1; 2; CUC2 (NAC); reactive oxygen species
Categories
Funding
- National Research Foundation of Korea [20110016440]
- Rural Development Administration [PJ008103]
- Plant Signaling Network Research Center [20110001099]
- Agricultural R & D Promotion Center, Korea Ministry for Food, Agriculture, Forestry and Fisheries [309017-03]
- Seoul Scholarship Foundation
- Institute of Planning & Evaluation for Technology in Food, Agriculture, Forestry & Fisheries (iPET), Republic of Korea [IPET309017-5] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-0014373] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Rural Development Administration (RDA), Republic of Korea [PJ008103012012] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Reactive oxygen species (ROS) are produced in plant cells primarily as by-products of aerobic energy metabolism. They are also generated during plant adaptation responses to environmental stresses, such as drought and high salinity. Therefore, plants have evolved ROS-detoxifying enzymes and antioxidants to cope with ROS accumulation. However, if stress conditions are prolonged, the level of ROS will surpass the capacity of the detoxifying machinery, causing oxidative damage to cellular constituents. It is known that ROS act in abscisic acid-mediated stress responses to sustain plant survival under adverse growth conditions. However, it is largely unknown how ROS metabolism is linked to stress responses. Here, we show that a drought-responsive NAC transcription factor NTL4 promotes ROS production by binding directly to the promoters of genes encoding ROS biosynthetic enzymes during drought-induced leaf senescence. Leaf senescence was accelerated in 35S:4?C transgenic plants over-expressing an active form of NTL4 under drought conditions. The 35S:4?C transgenic plants were hypersensitive to drought, and ROS accumulated in the leaves. In contrast, ROS levels were reduced in NTL4-deficient ntl4 mutants, which exhibited delayed leaf senescence and enhanced drought resistance. These observations indicate that NTL4 acts as a molecular switch that couples ROS metabolism to drought-induced leaf senescence in Arabidopsis.
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