PDF(Pubmed)
Abstract：
Salinity is a worldwide problem limiting the plant growth and risking food security. This study was conducted to examine exogenous application of silicon (Si), gibberellic acid (GA3) upon the ion transport, growth, yield, and antioxidant enzymes activities of pea plant in saline conditions. Two pea varieties Meteor-FSD and Samrina Zard were pre-treated with GA3 (10-4 M) for 12 h. Plants were allowed to grow with or without silicon in washed silica sand. Ten days old seedlings were shifted in pots with 10 kg soil. Twenty-five days old plants were exposed to 0 and 5 dS m-1 sodium stress. Results showed that exogenous application of GA3 + Si was the best treatment for increasing plant biomass and yield in the presence and absence of NaCl. Furthermore, application of Si or GA3 enhanced chlorophyll content in the leaves, thereby increasing the net assimilation rate of pea varieties under NaCl stress by increasing the antioxidant enzyme activity. Treatment of Si alone or in combination with GA3 significantly reduced Na+ movement in both pea varieties. Results showed that Si has more prominent role than GA3 alone to build-up high plant biomass, yield, soluble protein content and reduction of Na+ transport. Samrina Zard variety showed higher yield, shoot and root dry weight as compared to Meteor-FSD variety in presence and absence of salt. It was concluded that Si can be used as a nutrient for pea under saline or non-saline conditions. Moreover, application of GA3 has a potential role for increasing salinity tolerance, mostly in sensitive pea varieties.
摘要：
盐度是限制植物生长和危及粮食安全的世界性问题。这项研究是为了检查硅（Si）的外源应用，赤霉素（GA3）在离子传输时，增长,产量，和豌豆植物在盐水条件下的抗氧化酶活性。将两个豌豆品种Meteor-FSD和SamrinaZard用GA3（10-4M）预处理12小时。使植物在洗涤的硅砂中在有或没有硅的情况下生长。将10天龄的幼苗移入具有10kg土壤的盆中。将25天龄的植物暴露于0和5dSm-1钠胁迫。结果表明，在存在和不存在NaCl的情况下，外源施用GA3Si是增加植物生物量和产量的最佳处理。此外，Si或GA3的应用提高了叶片中的叶绿素含量，从而通过提高抗氧化酶活性来提高NaCl胁迫下豌豆品种的净同化率。单独或与GA3联合处理Si均显着降低了两个豌豆品种的Na运动。结果表明，Si比单独的GA3具有更突出的作用，以建立高植物生物量，产量，可溶性蛋白质含量和Na+转运的减少。SamrinaZard品种表现出更高的产量，在存在和不存在盐的情况下，与Meteor-FSD品种相比，芽和根干重。结论是Si可以在盐水或非盐水条件下用作豌豆的营养素。此外，GA3的应用对提高耐盐性有潜在的作用，主要是敏感豌豆品种。
