Melo Alberto Soares de, Costa Rayssa Ribeiro da, Sá Francisco Vanies da Silva, Dias Guilherme Felix, Alencar Rayanne Silva de, Viana Priscylla Marques de Oliveira, Peixoto Tayd Dayvison Custódio, Suassuna Janivan Fernandes, Brito Marcos Eric Barbosa, Ferraz Rener Luciano de Souza, Costa Patrícia da Silva, Melo Yuri Lima, Corrêa Élida Barbosa, Lacerda Claudivan Feitosa de, Dantas Neto José
Department of Biology, Universidade Estadual da Paraíba, Campina Grande 58429-500, PB, Brazil.
Department of Agrarian and Exact, Universidade Estadual da Paraíba, Catolé do Rocha 58884-000, PB, Brazil.
Plants (Basel). 2024 Feb 26;13(5):634. doi: 10.3390/plants13050634.
Plant endogenous mechanisms are not always sufficient enough to mitigate drought stress, therefore, the exogenous application of elicitors, such as salicylic acid, is necessary. In this study, we assessed the mitigating action of salicylic acid (SA) in cowpea genotypes under drought conditions. An experiment was conducted with two cowpea genotypes and six treatments of drought stress and salicylic acid (T1 = Control, T2 = drought stress (stress), T3 = stress + 0.1 mM of SA, T4 = stress + 0.5 mM of SA, T5 = stress + 1.0 mM of SA, and T6 = stress + 2.0 mM of SA). Plants were evaluated in areas of leaf area, stomatal conductance, photosynthesis, proline content, the activity of antioxidant enzymes, and dry grain production. Drought stress reduces the leaf area, stomatal conductance, photosynthesis, and, consequently, the production of both cowpea genotypes. The growth and production of the BRS Paraguaçu genotype outcompetes the Pingo de Ouro-1-2 genotype, regardless of the stress conditions. The exogenous application of 0.5 mM salicylic acid to cowpea leaves increases SOD activity, decreases CAT activity, and improves the production of both genotypes. The application of 0.5 mM of salicylic acid mitigates drought stress in the cowpea genotype, and the BRS Paraguaçu genotype is more tolerant to drought stress.
植物内源机制往往不足以缓解干旱胁迫，因此，有必要外源施用诱导子，如水杨酸。在本研究中，我们评估了水杨酸（SA）在干旱条件下对豇豆基因型的缓解作用。对两种豇豆基因型进行了一项实验，设置了六种干旱胁迫和水杨酸处理（T1 = 对照，T2 = 干旱胁迫，T3 = 胁迫 + 0.1 mM SA，T4 = 胁迫 + 0.5 mM SA，T5 = 胁迫 + 1.0 mM SA，T6 = 胁迫 + 2.0 mM SA）。对植株的叶面积、气孔导度、光合作用、脯氨酸含量、抗氧化酶活性和干粒产量等方面进行了评估。干旱胁迫会减小叶面积、降低气孔导度和光合作用，从而降低两种豇豆基因型的产量。无论胁迫条件如何，BRS巴拉瓜苏基因型的生长和产量都优于金滴1-2基因型。向豇豆叶片外源施用0.5 mM水杨酸可提高超氧化物歧化酶（SOD）活性，降低过氧化氢酶（CAT）活性，并提高两种基因型豇豆的产量。施用浓度为0.5 mM的水杨酸可缓解豇豆基因型的干旱胁迫，且BRS巴拉瓜苏基因型对干旱胁迫的耐受性更强。
