Journal
PHYSIOLOGIA PLANTARUM
Volume 172, Issue 3, Pages 1452-1464Publisher
WILEY
DOI: 10.1111/ppl.13330
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Funding
- National Key Research and Development Program of China [2018YFD1000303]
- Agricultural Scientific and Technological Innovation Project of Shandong Academy of Agricultural Sciences [CXGC2018F03]
- earmarked fund for the China Agriculture Research System [CARS-27]
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The study revealed that the MdHB7-like gene in apple is induced under salt stress, and overexpression of this gene enhances salt tolerance in apple plants by improving photosynthetic performance, reducing ROS and Na+ accumulation, and increasing proline and soluble sugars accumulation. These findings highlight the important role of MdHB7-like as a regulator of salt tolerance in apple and provide potential insights for molecular breeding research.
Salinity is a major environmental constraint that substantially limits global agricultural productivity. HD-Zip I transcription factors are involved in plant responses to salt stress, but little is known about the HD-Zip I genes in apple (Malus domestica). Here, we characterized the function of an apple HD-Zip I gene (MdHB7-like) and report that its expression is induced by salt stress. To further explore its role in salt stress, we created MdHB7-like overexpressing and RNAi transgenic apple plants. The overexpression of MdHB7-like improved the photosynthetic performance and reduced ROS and Na+ accumulation under salt stress. Plants that overexpressed MdHB7-like also showed increased accumulation of proline and soluble sugars, which may have played an important role in their salt stress tolerance. RNAi suppression of MdHB7-like had the opposite effects. Together, our results demonstrate that MdHB7-like is an important regulator of salt tolerance in apple. Our results provide new insights for future research on the mechanisms by which MdHB7-like promotes salt tolerance and provide a potential target for molecular breeding in apple.
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