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2024, Volume 11, Issue 1

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Frontiers of Agricultural Science and Engineering doi: 10.15302/J-FASE-2021388

APPLE SUMO E3 LIGASE MDSIZ1 NEGATIVELY REGULATES DROUGHT TOLERANCE

State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Apple Laboratory, College of Horticulture, Northwest A&F University, Yangling 712100, China.

Received: 2021-03-11 Accepted: 2021-04-16 Available online: 2021-04-16
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Abstract

Drought stress typically causes heavy losses in apple production and uncovering the mechanisms by which apple tolerates drought stress is important in apple breeding. MdSIZ1 is a SUMO (small ubiquitin-like modifier) E3 ligase that promotes SUMO binding to substrate proteins. Here, we demonstrate that in apple has a negative relationship with drought tolerance. RNAi transgenic apple trees had a higher survival rate after drought stress. During drought stress they had higher leaf water potential, reduced ion leakage, lower H O and malondialdehyde contents, and higher catalase activity. In addition, RNAi transgenic plants had a higher net photosynthetic rate during the latter period of drought stress. Finally, the transgenic apple trees also altered expression levels of some microRNAs in response to drought stress. Taken together, these results indicate that apple MdSIZ1 negatively regulates drought stress by enhancing leaf water-holding capacity and antioxidant enzyme activity.

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