Menadione sodium bisulphite (MSB) mediates plant defense responses under abiotic stresses. In present experiment, Cd stress (1 mM) resulted in significant reduction in growth, relative water contents, chlorophyll and uptake of essential nutrients in two okra cultivars (Shabnum and Arka Anamika). Cd-induced reduction in these variables was more in cv. Arka Anamika compared with cv. Shabnum 786. Cd caused oxidative damage in the form of higher cellular levels of MDA and H₂O₂. MSB applications (0, 50, 100, 150 and 200 µM) had differential effect on growth and key physio-biochemical attributes. Higher MSB dose (200 µM) was lethal as it further aggravated damages under Cd toxicity. However, plants treated with 100 µM MSB exhibited lesser oxidative damage due to better oxidative defense in the form of stimulated activities of antioxidant enzymes (SOD, POD, CAT and APX) and increased concentration of non-enzymatic antioxidants (phenolics, flavonoids and ascorbic acid). Moreover, 100 µM MSB mitigated Cd effect on the uptake of Ca, K, and Mg. MSB also reduced the uptake and transport of Cd to aerial parts of plants. The results of present study revealed MSB-induced slight oxidative burst that induced the accumulation of reactive oxygen species (ROS) scavenging defense proteins under Cd stress.

甲萘醌亚硫酸氢钠（MSB）在非生物胁迫下介导植物防御反应。在目前的实验中，镉胁迫（1 mM）导致两个秋葵（Shabnum和Arka Anamika）的生长，相对含水量，叶绿素和必需营养素的吸收显着降低。Cd导致这些变量减少的cv更大。Arka Anamika与简历相比。Shabnum 786. Cd以较高的细胞水平MDA和H ₂ O ₂形式引起氧化损伤。MSB应用（0、50、100、150和200 µM）对生长和关键的生理生化特性具有不同的影响。更高的MSB剂量（200 µM）具有致死性，因为它进一步加重了Cd毒性下的破坏。但是，用100 µM MSB处理的植物由于抗氧化酶（SOD，POD，CAT和APX）的刺激活性和非酶类抗氧化剂（酚类，类黄酮和抗坏血酸）的浓度增加而表现出更好的氧化防御能力，因此氧化损伤较小。 ）。此外，100 µM MSB减轻了镉对钙，钾和镁吸收的影响。MSB还减少了Cd对植物地上部分的吸收和运输。本研究的结果揭示了MSB诱导的轻微氧化爆发，诱导了Cd胁迫下清除防御素的活性氧（ROS）的积累。