The effect of exogenous melatonin on root growth and lifespan and seed cotton yield under drought stress
文献类型： 外文期刊
作者： Zhu, Lingxiao 1 ; Li, Anchang 1 ; Sun, Hongchun 1 ; Li, Ping 2 ; Liu, Xiaoqing 1 ; Guo, Congcong 1 ; Zhang, Yongjiang 1 ; Zhang, Ke 1 ; Bai, Zhiying 1 ; Dong, Hezhong 1 ; Liu, Liantao 1 ; Li, Cundong 1 ;
作者机构： 1.Hebei Agr Univ, Coll Agron, State Key Lab North China Crop Improvement & Regul, Key Lab Crop Growth Regulat Hebei Prov, Baoding 071001, Hebei, Peoples R China
2.Handan Acad Agr Sci, Handan 056001, Peoples R China
3.Shandong Acad Agr Sci, Cotton Res Ctr, Jinan 250100, Peoples R China
关键词： Cotton; Drought; Melatonin; Root growth; Root lifespan; Yield
期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：5.9； 五年影响因子：6.0 ）
ISSN： 0926-6690
年卷期： 2023 年 204 卷
页码：
收录情况： SCI
摘要： Drought stress is the major environmental factor that inhibits the growth and reduces the yield of cotton (Gossypium hirsutum L.). The exogenous application of melatonin has been shown to alleviate drought stress damage, but it is unclear whether melatonin mediates the alleviation by preventing the drought-induced inhibition of root growth. To address this gap, we subjected cotton plants grown in RhizoPotsto treatments of thorough watering, drought stress treatment, and drought stress supplemented with exogenous melatonin. Melatonin promoted the aboveground growth compared with the non-melatonin treatment under drought stress, and increased the plant height, stem diameter, leaf area, SPAD value, and net photosynthetic rate. The application of melatonin significantly prevented the drought-induced yield losses by increasing the boll weight. The drought stress+melatonin treatment significantly increased the root length, root surface area, root volume, and specific root length by 18.36%, 25.46%, 26.07%, and 18.53%, respectively, compared with the drought stress treatment. Under drought stress, melatonin increased the root length by increasing its maximum and average rates of accumulation and increased the taproot diameter by increasing its maximum and average rates of accumulation. The drought stress+melatonin treatment significantly increased the lifespan of lateral roots and root hairs compared with the drought stress treatment. In conclusion, this study indicated that exogenous melatonin could improve the drought resistance and yield of cotton by promoting root growth and delaying root senescence.
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