Department of Botany, Aligarh Muslim University, Aligarh, 202002, India.
Department of Botany, Aligarh Muslim University, Aligarh, 202002, India.
Chemosphere. 2021 Aug;276:130153. doi: 10.1016/j.chemosphere.2021.130153. Epub 2021 Mar 4.
Boron (B) toxicity is a notable abiotic hindrance that restricts crop productivity by disturbing several physiological and biochemical processes in plants. This study was aimed to elucidate the role of salicylic acid (SA) in conferring tolerance to B stress in Mentha arvensis and Cymbopogon flexuosus. Boron toxicity led to a considerable decrease in shoot height and root length, fresh and dry mass of shoot and root, and physiological and biochemical parameters. However, exogenously applied SA relieved the adverse effects caused by B toxicity and led to an increase in growth parameters under B stress and non-stress conditions. The treatment of B resulted in its increased accumulation in roots and shoots of both the plants which, in turn, caused oxidative damage as evident by increased content of malondialdehyde and catalase, peroxidase, superoxide dismutase and glutathione reductase enzyme activities. However, exogenous SA supply significantly affected antioxidant enzyme activities and protected the plants from excess B. Moreover, the essential oil content of two selected plants declined under B toxicity and significantly enhanced in SA-treated stressed plants. The contents of menthol and menthyl acetate in M. arvensis were lowered in B stressed plants which significantly improved in SA treated B-stressed and in their respective SA alone treatment. Similarly, citral-A and citral-B content of C. flexuosus declined under B toxicity, however, SA reversed the negative effects of B toxicity on essential oil components. This assessment stipulated the promising role of exogenously applied SA in alleviating B toxicity in M. arvensis and C. flexuosus by improving antioxidant machinery and limiting B uptake which protects the structural integrity of leaves and also helps in increasing essential oil content.
硼（B）毒性是一种显著的非生物胁迫，通过干扰植物的几个生理和生化过程来限制作物生产力。本研究旨在阐明水杨酸（SA）在赋予薄荷（Mentha arvensis）和香茅草（Cymbopogon flexuosus）对 B 胁迫耐性中的作用。硼毒性导致株高和根长、地上和地下部分的鲜重和干重以及生理生化参数显著下降。然而，外源 SA 缓解了 B 毒性引起的不利影响，并在 B 胁迫和非胁迫条件下增加了生长参数。处理 B 导致其在两种植物的根和地上部分积累增加，这反过来又导致丙二醛含量增加和过氧化氢酶、过氧化物酶、超氧化物歧化酶和谷胱甘肽还原酶活性增加，从而造成氧化损伤。然而，外源 SA 供应显著影响抗氧化酶活性并保护植物免受过量 B 的侵害。此外，两种选定植物的精油含量在 B 毒性下下降，并在 SA 处理的胁迫植物中显著增强。薄荷中薄荷醇和薄荷乙酸酯的含量在 B 胁迫植物中降低，而在 SA 处理的 B 胁迫植物和各自的 SA 单独处理中显著提高。同样，香茅草中的柠檬醛-A 和柠檬醛-B 含量在 B 毒性下下降，然而，SA 逆转了 B 毒性对精油成分的负面影响。这项评估规定了外源 SA 通过改善抗氧化机制和限制 B 吸收来缓解薄荷和香茅草中 B 毒性的有希望的作用，从而保护叶片的结构完整性，并有助于增加精油含量。
