PDF(Pubmed)
Abstract：
Drought stress poses a significant threat to agricultural productivity, especially in areas susceptible to water scarcity. Sunflower (Helianthus annuus L.) is a widely cultivated oilseed crop with considerable potential globally. Jasmonic acid, a plant growth regulator, plays a crucial role in alleviating the adverse impacts of drought stress on the morphological, biochemical, and physiological characteristics of crops. Experimental detail includes sunflower varieties (Armani Gold, KQS-HSF-1, Parsun, and ESFH-3391), four drought stress levels (0, 25%, 50%, and 75% drought stress), and three levels (0, 40ppm, 80ppm) of jasmonic acid. The 0% drought stress and 0ppm jasmonic acid were considered as control treatments. The experimental design was a completely randomized design with three replicates. Drought stress significantly reduced the growth in all varieties. However, the exogenous application of jasmonic acid at concentrations of 40ppm and 80ppm enhanced growth parameters, shoot and root length (1.93%, 19%), shoot and root fresh weight (18.5%, 25%), chlorophyll content (36%), photosynthetic rate (22%), transpiration rate (40%), WUE (20%), MDA (6.5%), Phenolics (19%), hydrogen peroxide (7%) proline (28%) and glycine betaine (15-30%) under water-stressed conditions, which was closely linked to the increase in stomatal activity stimulated by jasmonic acid. Furthermore, JA 80 ppm was found to be the most appropriate dose to reduce the effect of water stress in all sunflower varieties. It was concluded that the foliar application of JA has the potential to enhance drought tolerance by improving the morphological, biochemical, and physiological of sunflower.
摘要：
干旱胁迫对农业生产力构成重大威胁,特别是在容易缺水的地区。向日葵（HelianthusannuusL.）是一种广泛种植的油料作物，在全球范围内具有相当大的潜力。茉莉酸,一种植物生长调节剂,在缓解干旱胁迫对形态学的不利影响中起着至关重要的作用,生物化学，和作物的生理特性。实验细节包括向日葵品种（阿玛尼金，KQS-HSF-1,Parsun,和ESFH-3391），四个干旱胁迫水平(0，25%，50%,和75%的干旱胁迫)，和三个级别(0，40ppm，80ppm)的茉莉酸。0%干旱胁迫和0ppm茉莉酸作为对照处理。实验设计是具有三个重复的完全随机设计。干旱胁迫显著降低了所有品种的生长。然而,40ppm和80ppm浓度的茉莉酸的外源施用提高了生长参数，芽和根长(1.93%，19%），芽和根鲜重(18.5%，25%），叶绿素含量（36%），光合速率（22%），蒸腾速率（40%），WUE（20%），MDA（6.5%），酚类物质（19%），过氧化氢（7％）脯氨酸（28％）和甘氨酸甜菜碱（15-30％）在水胁迫条件下，这与茉莉酸刺激的气孔活动增加密切相关。此外，发现JA80ppm是降低所有向日葵品种水分胁迫影响的最合适剂量。结论是，JA的叶面施用具有通过改善形态来增强耐旱性的潜力，生物化学，向日葵的生理。
