■砷(As)是土壤和水中常见的剧毒和致癌污染物,对人类健康和植物生长构成重大风险。
■本研究的目的是评估形态学,生物化学,和生理标记,以及离子稳态,通过外源施用水杨酸(SA)来减轻向日葵中As的毒性作用,γ-氨基丁酸(GABA),和他们的组合。
■使用两种向日葵基因型进行了盆栽实验,FH-779和FH-773,经受As胁迫(60mgkg-1),以评估100mgL-1的SA,200mgL-1的GABA及其组合对生长和相关生理生化属性的影响在As胁迫下。
■研究表明,As毒性对各种生长参数有不利影响,叶绿素色素,相对含水量,总蛋白质,和向日葵植物的营养吸收。它还导致氧化应激增加,丙二醛(MDA)和过氧化氢(H2O2)含量较高,随着As在根和叶中的积累。然而,SA和GABA的应用通过增强酶促抗氧化防御系统来保护免受As诱导的损伤。这是通过激活超氧化物歧化酶(SOD)来实现的,过氧化氢酶(CAT),和过氧化物酶(POD)活性,以及渗透压的增加。它们还改善了砷毒性下的养分获取和植物生长。
■我们研究了SA和GABA在减轻砷对向日葵的植物毒性作用中的调节作用。我们的结果表明,SA和GABA在调节生长方面存在显著的相互作用,光合作用,代谢物,抗氧化防御系统,在As胁迫下向日葵的养分吸收。这些发现为植物防御机制和策略提供了宝贵的见解,以增强污染环境中的胁迫耐受性。在未来,SA和GABA可能是在其他面临非生物胁迫条件的重要作物中管理胁迫的有价值的工具。
UNASSIGNED: Arsenic (As) is a highly toxic and carcinogenic pollutant commonly found in soil and water, posing significant risks to human health and plant growth.
UNASSIGNED: The objectives of this study to evaluate morphological, biochemical, and physiological markers, as well as ion homeostasis, to alleviate the toxic effects of As in sunflowers through the exogenous application of salicylic acid (SA), γ-aminobutyric acid (GABA), and their combination.
UNASSIGNED: A pot experiment was conducted using two sunflower genotypes, FH-779 and FH-773, subjected to As stress (60 mg kg-1) to evaluate the effects of SA at 100 mg L-1, GABA at 200 mg L-1, and their combination on growth and related physiological and biochemical attributes under As stress.
UNASSIGNED: The study revealed that As toxicity had a detrimental effect on various growth parameters, chlorophyll pigments, relative water content, total proteins, and nutrient uptake in sunflower plants. It also led to increased oxidative stress, as indicated by higher levels of malondialdehyde (MDA) and hydrogen peroxide (H2O2), along with As accumulation in the roots and leaves. However, the application of SA and GABA protected against As-induced damage by enhancing the enzymatic antioxidant defense system. This was achieved through the activation of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) activities, as well as an increase in osmolytes. They also improved nutrient acquisition and plant growth under As toxicity.
UNASSIGNED: We investigated the regulatory roles of SA and GABA in mitigating arsenic-induced phytotoxic effects on sunflower. Our results revealed a significant interaction between SA and GABA in regulating growth, photosynthesis, metabolites, antioxidant defense systems, and nutrient uptake in sunflower under As stress. These findings provide valuable insights into plant defense mechanisms and strategies to enhance stress tolerance in contaminated environments. In the future, SA and GABA could be valuable tools for managing stress in other important crops facing abiotic stress conditions.