Exogenous melatonin improves cotton yield under drought stress by enhancing root development and reducing root damage

IF 4.6 1区 农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY
Lingxiao Zhu, Hongchun Sun, Ranran Wang, Congcong Guo, Liantao Liu, Yongjiang Zhang, Ke Zhang, Zhiying Bai, Anchang Li, Jiehua Zhu, Cundong Li
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Abstract

The exogenous application of melatonin by the root drenching method is an effective way to improve crop drought resistance. However, the optimal concentration of melatonin by root drenching and the physiological mechanisms underlying melatonin-induced drought tolerance in cotton ( L.) roots remain elusive. This study determined the optimal concentration of melatonin by root drenching and explored the protective effects of melatonin on cotton roots. The results showed that 50 μmol L melatonin was optimal and significantly mitigated the inhibitory effect of drought on cotton seedling growth. Exogenous melatonin promoted root development in drought-stressed cotton plants by remarkably increasing the root length, projected area, surface area, volume, diameter, and biomass. Melatonin also mitigated the drought-weakened photosynthetic capacity of cotton and regulated the endogenous hormone contents by regulating the relative expression levels of hormone-synthesis genes under drought stress. Melatonin-treated cotton seedlings maintained optimal enzymatic and non-enzymatic antioxidant capacities, and produced relatively lower levels of reactive oxygen species and malondialdehyde, thus reducing the drought stress damage to cotton roots (such as mitochondrial damage). Moreover, melatonin alleviated the yield and fiber length declines caused by drought stress. Taken together, these findings show that root drenching with exogenous melatonin increases the cotton yield by enhancing root development and reducing the root damage induced by drought stress. In summary, these results provide a foundation for the application of melatonin in the field by the root drenching method.
外源褪黑激素通过促进根系发育和减少根系损伤提高干旱胁迫下的棉花产量
通过灌根法外源施用褪黑激素是提高作物抗旱性的有效方法。然而,褪黑激素在棉花根部淋施的最佳浓度以及褪黑激素诱导棉花根部抗旱的生理机制仍未确定。本研究确定了根部淋洗褪黑激素的最佳浓度,并探讨了褪黑激素对棉花根部的保护作用。结果表明,50 μmol L褪黑激素是最佳浓度,能显著减轻干旱对棉花幼苗生长的抑制作用。外源褪黑素能促进干旱胁迫棉株的根系发育,显著增加根长、投影面积、表面积、体积、直径和生物量。褪黑素还能缓解干旱对棉花光合能力的削弱,并通过调节干旱胁迫下激素合成基因的相对表达水平来调节内源激素含量。褪黑素处理的棉花幼苗保持了最佳的酶和非酶抗氧化能力,产生的活性氧和丙二醛水平相对较低,从而减轻了干旱胁迫对棉花根系的损伤(如线粒体损伤)。此外,褪黑素还能缓解干旱胁迫造成的产量和纤维长度下降。综上所述,这些研究结果表明,用外源褪黑素浸根可以促进根系发育,减少干旱胁迫对根系的损伤,从而提高棉花产量。总之,这些结果为褪黑激素在田间通过淋根法的应用奠定了基础。
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来源期刊
Journal of Integrative Agriculture
Journal of Integrative Agriculture AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
7.90
自引率
4.20%
发文量
4817
审稿时长
3-6 weeks
期刊介绍: Journal of Integrative Agriculture publishes manuscripts in the categories of Commentary, Review, Research Article, Letter and Short Communication, focusing on the core subjects: Crop Genetics & Breeding, Germplasm Resources, Physiology, Biochemistry, Cultivation, Tillage, Plant Protection, Animal Science, Veterinary Science, Soil and Fertilization, Irrigation, Plant Nutrition, Agro-Environment & Ecology, Bio-material and Bio-energy, Food Science, Agricultural Economics and Management, Agricultural Information Science.
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