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Special Issue:
园艺-分子生物合辑Horticulture — Genetics · Breeding
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| Overexpression of MdMIPS1 enhances drought tolerance and water-use efficiency in apple |
| HU Ling-yu, YUE Hong, ZHANG Jing-yun, LI Yang-tian-su, GONG Xiao-qing, ZHOU Kun, MA Feng-wang |
| State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A&F University, Yangling 712100, P.R.China |
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摘要
肌醇及其衍生物在调节植物非生物逆境耐受性过程中发挥着重要作用。肌醇-1-磷酸合成酶MIPS（myo-inositol-1-phosphate synthase）是肌醇生物合成限速酶，本研究发现，在苹果植株中过表达MdMIPS1基因不仅能提高肌醇生物合成，而且还能提高植株耐旱性。研究表明，肌醇可能通过提高渗透保护剂（如葡萄糖、蔗糖和脯氨酸）的积累和改善活性氧清除相关抗氧化酶活性，提高苹果干旱耐受性。此外，在模拟黄土高原土壤环境的长期中度水分亏缺条件下，MdMIPS1过表达苹果植株表现为水分利用效率显著提高，这可能主要与肌醇生物合成增加协同调节植株渗透平衡和气孔孔径密切相关。综上所述，本研究揭示了苹果MdMIPS1介导的肌醇生物合成在植株耐旱性和水分利用效率调控过程中的积极作用。
Abstract Myo-inositol and its derivatives play important roles in the tolerance of higher plants to abiotic stresses, and myo-inositol-1-phosphate synthase (MIPS) is the rate-limiting enzyme in myo-inositol biosynthesis. In this study, we found that increased myo-inositol biosynthesis enhanced drought tolerance in MdMIPS1-overexpressing apple lines under short-term progressive drought stress. The effect of myo-inositol appeared to be mediated by the increased accumulation of osmoprotectants such as glucose, sucrose, and proline, and by the increased activities of antioxidant enzymes that eliminate reactive oxygen species. Moreover, enhanced water-use efficiency (WUE) was observed in MdMIPS1-overexpressing apple lines under long-term moderate water deficit conditions that mimicked the water availability in the soil of the Loess Plateau. Enhanced WUE may have been associated with the synergistic regulation of osmotic balance and stomatal aperture mediated by increased myo-inositol biosynthesis. Taken together, our findings shed light on the positive effects of MdMIPS1-mediated myo-inositol biosynthesis on drought tolerance and WUE in apple.
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Received: 26 May 2020
Accepted: 23 August 2021
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| Fund: This work was supported by the National Key Research and Development Program of China (2018YFD1000303) and the China Agriculture Research System of MOF and MARA (CARS-27). |
| About author: Correspondence MA Feng-wang, Tel: +86-29-87082648, E-mail: fwm64@sina.com, fwm64@nwsuaf.edu.cn |
Cite this article:
HU Ling-yu, YUE Hong, ZHANG Jing-yun, LI Yang-tian-su, GONG Xiao-qing, ZHOU Kun, MA Feng-wang.
2022.
Overexpression of MdMIPS1 enhances drought tolerance and water-use efficiency in apple. Journal of Integrative Agriculture, 21(7): 1968-1981.
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