期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 21, 期 24, 页码 -出版社
MDPI
DOI: 10.3390/ijms21249454
关键词
abscisic acid; Arabidopsis; drought tolerance; ion leakage; poplar; transpirational water loss; XERICO
资金
- National Research Foundation of Korea [2014071G10-1722-AA04]
- [NRF-2018R1A2B2005362]
- [NRF-2018R1A6A3A01013476]
- Korea Forestry Promotion Institute (KOFPI) [2014071G10-1722-AA04] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Drought stress is one of the major environmental problems in the growth of crops and woody perennials, but it is getting worse due to the global climate crisis. XERICO, a RING (Really Interesting New Gene) zinc-finger E3 ubiquitin ligase, has been shown to be a positive regulator of drought tolerance in plants through the control of abscisic acid (ABA) homeostasis. We characterized a poplar (Populus trichocarpa) RING protein family and identified the closest homolog of XERICO called PtXERICO. Expression of PtXERICO is induced by both salt and drought stress, and by ABA treatment in poplars. Overexpression of PtXERICO in Arabidopsis confers salt and ABA hypersensitivity in young seedlings, and enhances drought tolerance by decreasing transpirational water loss. Consistently, transgenic hybrid poplars overexpressing PtXERICO demonstrate enhanced drought tolerance with reduced transpirational water loss and ion leakage. Subsequent upregulation of genes involved in the ABA homeostasis and drought response was confirmed in both transgenic Arabidopsis and poplars. Taken together, our results suggest that PtXERICO will serve as a focal point to improve drought tolerance of woody perennials.
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