Abstract

Chromium (Cr) is a major abiotic stress for plant species that significantly impacted plant development and impeded agricultural production. Menadione sodium bisulfite (MSB) has recently manifested a remarkable role in modulating plant defense responses. In the present experiment, Cr caused a significant decrease in growth, relative water contents, and chlorophyll in okra cultivars (Shabnam 786 and Arka Anamika). Cr produced an increase in proline, total soluble proteins, total free amino acids, phenolics, flavonoids, ascorbic acid, hydrogen peroxide (H₂O₂), malondialdehyde (MDA), and Cr accumulation. Besides, activities of antioxidant enzymes were also higher in Cr-stressed plants. MSB application (50, 100, 150, and 200 µM) profoundly impacted growth and important physio-biochemical characteristics in okra under Cr stress. Better growth in MSB treated plants was associated with lower oxidative damage and better oxidative defense system reflected in the form of higher antioxidant enzyme activities alongside the concentrations of non-enzymatic antioxidant compounds. In this background, cv. Shabnam-786 exhibited greater Cr tolerance over Arka Anamika. The degree of oxidative damage measured in the form of H₂O₂ and MDA was greater in cv. Arka Anamika. Lower MSB levels (50 and 100 µM) circumvented inhibitory Cr effects in okra, while higher doses proved lethal for plant growth and development.

摘要

铬（Cr）是植物物种的主要非生物胁迫，会严重影响植物发育并阻碍农业生产。甲萘醌亚硫酸氢钠（MSB）最近在调节植物防御反应中表现出显著作用。在本实验中，Cr导致秋葵品种（Shabnam 786和Arka Anamika）的生长，相对含水量和叶绿素显着下降。铬增加了脯氨酸，总可溶性蛋白，总游离氨基酸，酚类，类黄酮，抗坏血酸，过氧化氢（H ₂ O _2）的含量。），丙二醛（MDA）和Cr积累。此外，在Cr胁迫的植物中，抗氧化酶的活性也较高。MSB（50、100、150和200 µM）的施用对Cr胁迫下秋葵的生长和重要的生理生化特性产生了深远的影响。MSB处理过的植物更好的生长与更低的氧化损伤和更好的氧化防御系统有关，这表现为更高的抗氧化酶活性以及非酶抗氧化化合物的浓度。在这种背景下，简历。与Arka Anamika相比，Shabnam-786的Cr耐受性更高。H ₂ O ₂形式的氧化损伤程度而MDA的简历则更高。Arka Anamika。较低的MSB水平（50和100 µM）避免了秋葵中的Cr抑制作用，而较高的剂量证明对植物的生长和发育具有致命作用。