To assess the potential of exogenously-applied vitamin E commonly known as alpha-tocopherol (α-TOC) in drought stress tolerance, an experiment was performed on cauliflower (Brassica oleracea L. var. botrytis) plants. Two cultivars (TCF-605 and White Figer) of cauliflower were subjected to control and drought stress conditions. After thirty days of drought stress treatment, cauliflower plants were treated with α-TOC (150 and 300 mg/L) as a foliage spray. Drought stress markedly inhibited the plant biomass, leaf characteristics such as relative water contents (RWC), chlorophyll pigments (a and b), proline, ascorbic acid (AsA), GB, however it elevated RMP, total phenolics, activities of antioxidant enzymes e.g., CAT, SOD and POD. Drought stress also adversely affected curd characteristics including its fresh weight, GB, proline, total phenolics and enzymes activities (SOD and CAT). Exogenously applied α-TOC considerably suppressed RMP, while it improved plant growth, yield, RWC, total phenolics, ascorbic acid and POD, SOD, and CAT enzyme activities in the leaves of the cauliflower. Exogenous application of α-TOC also raised curd total phenolics, AsA and the activities of all observed enzymes under water deficiency. The cv. TCF-605 was better in shoot weight, shoot length, RWC, proline as well as GB contents, while cv. White Figer was higher in leaf RMP, proline and AsA levels under drought stress conditions. Overall, the results exhibited that cauliflower cv. TCF-605 was relatively tolerant to water stress in relation to growth and yield outcomes, which was interlinked with α-TOC-induced improved leaf and curd osmoprotection and antioxidative defense system. So, exogenous application of α-TOC can be suggested for improving growth and yield potential of crops subjected to drought stress.

为了评估外源施用的维生素 E（通常称为α-生育酚 (α-TOC)）在干旱胁迫耐受性中的潜力，在花椰菜 (Brassica oleracea L. var. botrytis) 植物上进行了一项实验。将两个花椰菜品种（TCF-605 和 White Figer）置于对照和干旱胁迫条件下。经过三十天的干旱胁迫处理后，用 α-TOC（150 和 300 mg/L）作为叶面喷雾处理花椰菜植物。干旱胁迫显着抑制植物生物量、叶片特征，如相对含水量（RWC）、叶绿素色素（a和b）、脯氨酸、抗坏血酸（AsA）、GB，但它提高了RMP、总酚、抗氧化酶的活性，例如、CAT、SOD 和 POD。干旱胁迫还对花球特性产生不利影响，包括鲜重、GB、脯氨酸、总酚和酶活性（SOD 和 CAT）。外源施用α-TOC显着抑制了RMP，同时提高了花椰菜叶片中的植物生长、产量、RWC、总酚、抗坏血酸以及POD、SOD和CAT酶活性。外源施用 α-TOC 还提高了缺水条件下凝乳总酚、AsA 和所有观察到的酶的活性。简历。TCF-605在芽重、芽长、RWC、脯氨酸以及GB含量方面较好，而cv. 在干旱胁迫条件下，白无花果的叶片 RMP、脯氨酸和 AsA 水平较高。总体而言，结果表明花椰菜 cv。TCF-605 相对于生长和产量结果而言对水分胁迫具有相对耐受性，这与 α-TOC 诱导的改善的叶片和花球渗透保护和抗氧化防御系统相关。因此，可以建议外源施用α-TOC来提高遭受干旱胁迫的作物的生长和产量潜力。