Department for Plant Physiology, Institute for Biological Research "Siniša Stanković", National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia.
Faculty of Agriculture, University of Belgrade, Belgrade, Serbia.
Plant Signal Behav. 2023 Dec 31;18(1):2219936. doi: 10.1080/15592324.2023.2219936.
In this study, the effects of foliar applied methyl jasmonate (MeJA) on drought-stressed growth and leaf physiology parameters: stomatal conductance, chlorophyll, flavonoid, anthocyanin, and nitrogen balance index (NBI), were evaluated. These parameters could serve as indicators of drought tolerance of , a popular horticultural plant worldwide that is very sensitive to drought. The experiment included four treatments: control, drought-stressed plants sprayed with distilled water, drought-stressed plants sprayed with 5 µM MeJA, and drought-stressed plants sprayed with 50 µM MeJA. Foliar spraying with MeJA was performed twice: seven days before and on the day of drought induction. The stressed plant groups were non-irrigated to achieve soil water contents (SWC) of 15 and 5%, while control plants were well-watered throughout the experiment (35-37% SWC). The results of this study showed that drought significantly reduced fresh and dry shoot weight, as well as total leaf area, but did not impact on dry matter content. The foliar application of MeJA improved growth parameters of , depending on the elicitor concentration and drought intensity. Stomatal conductance was slightly reduced at 5% SWC, and foliar applied MeJA at both concentrations. The flavonoid index was slightly reduced at 15 and 5% SWC when 50 µM MeJA was foliar applied, while there were no observed changes in the anthocyanin index in any treatments. The foliar application of 50 µM MeJA increased the chlorophyll index and NBI of at 5% SWC, indicating a contribution of the elicitor to plant drought tolerance at the physiological level.
在这项研究中，评估了叶面喷施茉莉酸甲酯（MeJA）对干旱胁迫下生长和叶片生理参数的影响：气孔导度、叶绿素、类黄酮、花青素和氮素平衡指数（NBI）。这些参数可以作为 耐旱性的指标， 是一种在全球范围内非常受欢迎的园艺植物，对干旱非常敏感。实验包括四个处理：对照、用蒸馏水喷洒的干旱胁迫植物、用 5μM MeJA 喷洒的干旱胁迫植物和用 50μM MeJA 喷洒的干旱胁迫植物。MeJA 叶面喷施进行了两次：干旱诱导前七天和当天。胁迫植物组未浇水，使土壤含水量（SWC）达到 15%和 5%，而对照植物在整个实验过程中保持良好浇水（SWC 为 35-37%）。本研究结果表明，干旱显著降低了 的鲜重和干重、总叶面积，但对干物质含量没有影响。MeJA 的叶面喷施改善了 的生长参数，具体取决于诱导剂浓度和干旱强度。在 5%SWC 时，气孔导度略有降低，两种浓度的 MeJA 叶面喷施时也是如此。在 15%和 5%SWC 时，用 50μM MeJA 叶面喷施时类黄酮指数略有降低，而在任何处理中都没有观察到花青素指数的变化。在 5%SWC 时，50μM MeJA 的叶面喷施增加了 的叶绿素指数和 NBI，表明诱导剂在生理水平上有助于植物耐旱性。
