Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 866 Yu-Hang-Tang Road, Hangzhou 310058, China.
Hainan Institute of Zhejiang University, Sanya 572025, China.
Int J Mol Sci. 2022 Nov 26;23(23):14819. doi: 10.3390/ijms232314819.
China has the largest sweet potato planting area worldwide, as well as the highest yield per unit area and total yield. Drought is the most frequently encountered environmental stress during the sweet potato growing season. In this study, we investigated salicylic acid (SA)-mediated defense mechanisms under drought conditions in two sweet potato varieties, Zheshu 77 and Zheshu 13. Drought stress decreased growth traits, photosynthetic pigments and relative water contents, as well as the photosynthetic capability parameters net photosynthetic rate, stomatal conductance and transpiration rate, whereas it increased reactive oxygen species production, as well as malondialdehyde and abscisic acid contents. The application of SA to drought-stressed plants reduced oxidative damage by triggering the modulation of antioxidant enzyme activities and the maintenance of optimized osmotic environments in vivo in the two sweet potato varieties. After SA solution applications, expression was downregulated and the abscisic acid contents of drought-stressed plants decreased, promoting photosynthesis and plant growth. Thus, foliar spraying an appropriate dose of SA, 2.00-4.00 mg·L, on drought-stressed sweet potato varieties may induce resistance in field conditions, thereby increasing growth and crop yield in the face of increasingly frequent drought conditions.
中国拥有世界上最大的甘薯种植面积，单位面积和总产量均居世界首位。干旱是甘薯生长季节最常遇到的环境胁迫。本研究以浙薯 77 和浙薯 13 两个甘薯品种为试材，探讨了干旱胁迫下水杨酸（SA）介导的防御机制。干旱胁迫降低了生长特性、光合色素和相对含水量以及光合作用参数净光合速率、气孔导度和蒸腾速率，而增加了活性氧的产生以及丙二醛和脱落酸的含量。在两种甘薯品种中，SA 的应用通过触发抗氧化酶活性的调节和体内优化的渗透环境来减轻干旱胁迫下植物的氧化损伤。SA 处理后，下调了表达，干旱胁迫下植物的脱落酸含量降低，促进了光合作用和植物生长。因此，在干旱胁迫下的甘薯品种叶片喷施适当剂量（2.00-4.00mg·L）的 SA 可能会在田间条件下诱导抗性，从而在日益频繁的干旱条件下增加生长和作物产量。
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