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通过种子引发,用新型微量营养素和茉莉酸甲酯混合物作为激发子,可以减轻氧化应激,从而提高水稻(Oryza sativa L.)的耐旱性。

A novel micronutrients and methyl jasmonate cocktail of elicitors via seed priming improves drought tolerance by mitigating oxidative stress in rice (Oryza sativa L.).

机构信息

Division of Biochemistry, ICAR-Indian Agricultural Research Institute, New Delhi-110012, India.

HCP-Division, ICAR-CIPHET, Abohar, Punjab-152116, India.

出版信息

Protoplasma. 2024 May;261(3):553-570. doi: 10.1007/s00709-023-01914-x. Epub 2023 Dec 30.

Abstract

Drought is a major limiting factor for rice (Oryza sativa L.) production globally, and a cost-effective seed priming technique using bio-elicitors has been found to have stress mitigating effects. Till date, mostly phytohormones have been preferred as bio-elicitors, but the present study is a novel attempt to demonstrate the favorable role of micronutrients-phytohormone cocktail, i.e., iron (Fe), zinc (Zn), and methyl jasmonate (MJ) via seed priming method in mitigating the deleterious impacts of drought stress through physio-biochemical and molecular manifestations. The effect of cocktail/priming was studied on the relative water content, chlorophyll a/b and carotenoid contents, proline content, abscisic acid (ABA) content, and on the activities of ascorbate peroxidase (APX), superoxide dismutase (SOD), NADPH oxidase (Nox), and catalase (CAT). The expressions of drought-responsive genes OsZn-SOD, OsFe-SOD, and Nox1 were found to be modulated under drought stress in contrasting rice genotypes -N-22 (Nagina-22, drought-tolerant) and PS-5 (Pusa Sugandh-5, drought-sensitive). A progressive rise in carotenoids (10-19%), ABA (18-50%), proline (60-80%), activities of SOD (27-62%), APX (46-61%), CAT (50-80%), Nox (16-30%), and upregulated (0.9-1.6-fold) expressions of OsZn-SOD, OsFe-SOD, and Nox1 genes were found in the primed plants under drought condition. This cocktail would serve as a potential supplement in modern agricultural practices utilizing seed priming technique to mitigate drought stress-induced oxidative burst in food crops.

摘要

干旱是全球水稻(Oryza sativa L.)生产的主要限制因素,已发现使用生物激发剂的经济有效的种子引发技术具有减轻胁迫的作用。迄今为止,大多数植物激素都被用作生物激发剂,但本研究是一项新颖的尝试,旨在通过种子引发方法证明微量元素-植物激素鸡尾酒(即铁(Fe)、锌(Zn)和茉莉酸甲酯(MJ))在减轻干旱胁迫的不利影响方面的有利作用通过生理生化和分子表现。研究了鸡尾酒/引发对相对水含量、叶绿素 a/b 和类胡萝卜素含量、脯氨酸含量、脱落酸(ABA)含量以及抗坏血酸过氧化物酶(APX)、超氧化物歧化酶(SOD)、NADPH 氧化酶(Nox)和过氧化氢酶(CAT)活性的影响。在不同的水稻基因型 -N-22(Nagina-22,耐旱)和 PS-5(Pusa Sugandh-5,耐旱)中发现,干旱响应基因 OsZn-SOD、OsFe-SOD 和 Nox1 的表达在干旱胁迫下受到调节。类胡萝卜素(10-19%)、ABA(18-50%)、脯氨酸(60-80%)、SOD(27-62%)、APX(46-61%)、CAT(50-80%)、Nox(16-30%)的活性和 OsZn-SOD、OsFe-SOD 和 Nox1 基因的上调表达(0.9-1.6 倍)在干旱条件下的引发植物中发现。这种鸡尾酒可以作为现代农业实践的潜在补充,利用种子引发技术来减轻粮食作物中干旱胁迫引起的氧化爆发。

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