Abstract

A field study on sugar beet with foliar application of jasmonic acid (JA) was evaluated under deficit irrigation regimes. The experiment was carried out in randomized complete block design with three replicates at two locations (Shahrekord and Shalamzar) in Chaharmahal-Bakhtiari Province, Iran during 2015 growing season. The experiment applied JA on sugar beet (Beta vulgaris L.) at two different concentrations of 5, 10 µM and control (foliar with water) under three water requirement of sugar beet (100, 75 and 50%). Physiological parameters of the sugar beet such as proline, soluble carbohydrates, chlorophyll content, carotenoid, anthocyanin, membrane stability index, root sugar content, root yield and sugar yield were evaluated. The results revealed water deficit led to decreases in carotenoid, chlorophyll content, relative water content, membrane stability index, root yield and sugar yield while proline and root sugar content increased significantly. Foliar application of JA resulted in notable improvements in the mean of all traits. JA amendment positively affected plant water relations mostly due to enhancements in osmoregulation. Ameliorative effects of exogenous JA tended to be greater in drought-stressed sugar beet plants as it led to the enhancement of chlorophyll content and relative water content in water deficit conditions. The results in this study demonstrated that the foliar application of JA significantly mitigated detrimental effects of water stress in sugar beet with increased root sugar content and sugar yield under water deficit regimes.

中文翻译：

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茉莉酸对缺水状况下甜菜糖产量和生理性状的影响：逐步回归法

摘要

在缺水灌溉制度下，对叶面施用茉莉酸（JA）的甜菜进行了田间研究。在2015年生长季节，该实验是在伊朗Chaharmahal-Bakhtiari省的两个位置（Shahrekord和Shalamzar）以三个完全重复的随机完整区组设计进行的。该实验将JA应用于甜菜（Beta vulgarisL.）在5、10 µM的两种不同浓度下，以及在甜菜的三种需水量（100％，75％和50％）下的对照（叶面水）。评估了甜菜的生理参数，如脯氨酸，可溶性碳水化合物，叶绿素含量，类胡萝卜素，花色苷，膜稳定性指数，根糖含量，根产量和糖产量。结果表明，水分亏缺导致类胡萝卜素，叶绿素含量，相对水分含量，膜稳定性指数，根产量和糖产量下降，而脯氨酸和根糖含量则显着增加。叶面喷施JA可以显着改善所有性状的平均值。JA修正案积极地影响了植物的水分关系，这主要是由于渗透调节作用的增强。外源JA在干旱胁迫下的甜菜植物中的改良作用趋于更大，因为它导致缺水条件下叶绿素含量和相对水分含量的增加。这项研究的结果表明，在缺水条件下，叶面施用JA显着减轻了甜菜中水分胁迫的有害影响，增加了根糖含量和糖产量。