Globally, soil salinity is a serious threat to horticultural crop productivity. Chili ( Capsicum annum L.) is a major spice horticultural crop. Its growth and production is severely affected by salt stress. To address this problem, a sand culture experiment was conducted in which two contrasting chili genotypes ‘ Plahi ’ (salt tolerant) and ‘A-120’ (salt sensitive) were grown under salt stress (50 mM NaCl) with foliar application of proline (0.8 mM). Proline application enhanced salt tolerance in both genotypes by osmoregulation of sodium and potassium. It enhanced chili growth and fruit yield by improving plant water relations and gas exchange attributes under salt stress. Antioxidants were increased with proline application under salt stress. There was also a significant positive correlation found among glycinebetaine and proline contents. In conclusion, protein-treated chili plants performed better than untreated plants as evidenced by normal function of photosynthetic machinery and antioxidant mechanisms under salt stress.

中文翻译：

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叶面施用脯氨酸通过调节光合属性、离子稳态和抗氧化防御机制诱导辣椒基因型的耐盐性

在全球范围内，土壤盐分是园艺作物生产力的严重威胁。辣椒 ( Capsicum annum L.) 是主要的香料园艺作物。它的生长和生产受到盐胁迫的严重影响。为了解决这个问题，进行了沙培养实验，其中两种对比辣椒基因型“Plahi”（耐盐）和“A-120”（盐敏感）在盐胁迫（50 mM NaCl）下生长，叶面喷施脯氨酸（ 0.8 毫米）。脯氨酸应用通过钠和钾的渗透调节增强了两种基因型的耐盐性。它通过改善盐胁迫下的植物水分关系和气体交换属性来促进辣椒的生长和果实产量。在盐胁迫下应用脯氨酸会增加抗氧化剂。在甘氨酸甜菜碱和脯氨酸含量之间也发现了显着的正相关。