Sodium Nitroprusside and Melatonin Improve Physiological Vitality and Drought Acclimation via Synergistically Enhancing Antioxidant Response in Dryland Maize

IF 3.9 3区 生物学 Q1 PLANT SCIENCES
Fazal Ullah, Saddam Saqib, Wasim Khan, Ling Zhao, Wajid Khan, Meng-Ying Li, You-Cai Xiong
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Abstract

It is critical to improve the adaptability of plants to drought stress through exogenous addition method. This study explored the combined effects of sodium nitroprusside (SNP) and melatonin (MT) on improving drought resilience in dryland maize. We hypothesized that the joint application of SNP + MT would enhance drought resilience through both above- and below-ground interactions. Maize plants were treated with SNP, MT, and a combination of both under different water stress conditions. The combined treatment was observed to significantly improve chlorophyll contents, water use efficiency (WUE), while reducing oxidative stress markers, compared to separate treatments and controls (CK). These improvements led to enhanced plant biomass and yield productivity under the conditions of drought. Specifically, leaf chlorophyll levels increased averagely by 24.22% under well-watered (WW) conditions, and 27.94% under mild water-stressed (MWS) conditions, respectively. In addition, the content of chlorophyll b increased by 13.27 and 56.32% in WW and MWS, respectively. Particularly, the combined treatment resulted in higher WUE, lower oxidative stress, and higher nutrient content [nitrogen, phosphorus, and potassium (NPK)], contributing to improved plant growth and yield. The examination uncovered noteworthy associations (p < 0.05) between these interventions and physiological characteristics, including heightened WUE, diminished oxidative stress, and augmented nutrient content. These factors contributed to the enhancement of plant production and biomass. The research also investigated the effects of microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN). Therefore, the combined application of SNP and MT can act as a promising strategy to enhance drought tolerance in maize, demonstrating a fine potential to improve crop productivity in drought-prone areas.

Abstract Image

硝普钠和褪黑素通过协同增强旱地玉米的抗氧化反应,改善其生理活力和干旱适应性
通过外源添加方法提高植物对干旱胁迫的适应性至关重要。本研究探讨了硝普钠(SNP)和褪黑激素(MT)对提高旱地玉米抗旱能力的联合作用。我们假设,联合应用 SNP + MT 可通过地上和地下的相互作用提高抗旱能力。在不同的水分胁迫条件下,玉米植株分别接受 SNP、MT 以及二者的联合处理。与单独处理和对照组(CK)相比,综合处理显著提高了叶绿素含量和水分利用效率(WUE),同时降低了氧化应激标记。这些改善提高了植物在干旱条件下的生物量和产量。具体而言,叶片叶绿素含量在水分充足(WW)条件下平均增加了 24.22%,在轻度水分胁迫(MWS)条件下平均增加了 27.94%。此外,叶绿素 b 的含量在 WW 和 MWS 条件下分别增加了 13.27% 和 56.32%。特别是,联合处理可提高 WUE 值、降低氧化应激和提高养分含量(氮、磷、钾(NPK)),从而改善植物生长和产量。研究发现,这些干预措施与生理特性之间存在显著的关联(p < 0.05),包括提高水分利用效率、降低氧化应激和增加养分含量。这些因素都有助于提高植物产量和生物量。研究还调查了微生物生物量碳(MBC)和微生物生物量氮(MBN)的影响。因此,SNP 和 MT 的联合应用可作为提高玉米耐旱性的一种有前途的策略,显示出提高干旱易发地区作物产量的巨大潜力。
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来源期刊
CiteScore
8.40
自引率
6.20%
发文量
312
审稿时长
1.8 months
期刊介绍: The Journal of Plant Growth Regulation is an international publication featuring original articles on all aspects of plant growth and development. We welcome manuscripts reporting question-based research on various aspects of plant growth and development using hormonal, physiological, environmental, genetic, biophysical, developmental and/or molecular approaches. The journal also publishes timely reviews on highly relevant areas and/or studies in plant growth and development, including interdisciplinary work with an emphasis on plant growth, plant hormones and plant pathology or abiotic stress. In addition, the journal features occasional thematic issues with special guest editors, as well as brief communications describing novel techniques and meeting reports. The journal is unlikely to accept manuscripts that are purely descriptive in nature or reports work with simple tissue culture without attempting to investigate the underlying mechanisms of plant growth regulation, those that focus exclusively on microbial communities, or deal with the (elicitation by plant hormones of) synthesis of secondary metabolites.
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