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Mitigating drought stress in sesame by foliar application of salicylic acid, beeswax waste and licorice extract
Agricultural Water Management ( IF 5.9 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.agwat.2019.105997
Nasibeh Pourghasemian , Rooholla Moradi , Mehdi Naghizadeh , Tommy Landberg

Abstract This study evaluated the effects of salicylic acid (SA), beeswax waste extract (BWE) and licorice extract (LE) as novel biostimulants, on drought-induced oxidative stress on sesame. The treatments consisted of three drought stress conditions (full irrigation, 90 % field capacity (FC); moderate stress, 60 % FC; and severe stress, 30 % FC) together with four exogenous foliar applications (control, water; LE, 5000 ppm; BWE, 2000 ppm; and SA, 1.5 mM). Plants subjected to drought stress displayed significant reduction in plant height, leaf area index, biological and seed yield, chlorophyll a and b content, quantum efficiency of photosystem II (Fv/Fm), net photosynthetic rate (Pn), stomatal conductance (gs), transpiration (Tr) and water use efficiency (WUE). Drought stress stimulated Malondialdehyde (MDA), proline, protein and carotenoid contents, and catalase (CAT), ascorbate peroxidase (APX), Guaiacol peroxidase (GPX) and glutathione reductase (GR) activity, while the exogenous foliar application of substances mitigated the oxidative damages. The alleviated effect of BWE on drought stress was more effective than those of LE and SA. In conclusion, it could be recommended that the application of the natural substances may lead to overcoming the negative effects of drought stress by regulating osmoprotectants content and antioxidant defense system, increasing mineral nutrients in plant organs and adjusting photosynthesis systems; consequently, contributing to improving the sesame productivity.

中文翻译:

叶面喷施水杨酸、蜂蜡废料和甘草提取物减轻芝麻干旱胁迫

摘要 本研究评估了作为新型生物刺激剂的水杨酸 (SA)、蜂蜡废料提取物 (BWE) 和甘草提取物 (LE) 对干旱引起的芝麻氧化应激的影响。处理包括三种干旱胁迫条件(完全灌溉,90% 田间持水量 (FC);中等胁迫,60% FC;和严重胁迫,30% FC)以及四种外源叶面施用(对照,水;LE,5000 ppm ;BWE,2000 ppm;和 SA,1.5 mM)。遭受干旱胁迫的植物的株高、叶面积指数、生物和种子产量、叶绿素 a 和 b 含量、光系统 II 的量子效率 (Fv/Fm)、净光合速率 (Pn)、气孔导度 (gs) 均显着降低、蒸腾作用 (Tr) 和水分利用效率 (WUE)。干旱胁迫刺激丙二醛 (MDA)、脯氨酸、蛋白质和类胡萝卜素含量,以及过氧化氢酶 (CAT)、抗坏血酸过氧化物酶 (APX)、愈创木酚过氧化物酶 (GPX) 和谷胱甘肽还原酶 (GR) 活性,而外源性叶面施用物质减轻了氧化损伤。BWE对干旱胁迫的缓解作用比LE和SA更有效。综上所述,建议应用天然物质可通过调节渗透保护剂含量和抗氧化防御系统,增加植物器官中的矿质养分和调节光合作用系统来克服干旱胁迫的负面影响;因此,有助于提高芝麻生产率。而外源性叶面施用物质减轻了氧化损伤。BWE对干旱胁迫的缓解作用比LE和SA更有效。综上所述,建议应用天然物质可通过调节渗透保护剂含量和抗氧化防御系统,增加植物器官中的矿质养分和调节光合作用系统来克服干旱胁迫的负面影响;因此,有助于提高芝麻生产率。而外源性叶面施用物质减轻了氧化损伤。BWE对干旱胁迫的缓解作用比LE和SA更有效。综上所述,天然物质的应用可能通过调节渗透保护剂含量和抗氧化防御系统,增加植物器官中的矿质养分和调节光合作用系统,从而克服干旱胁迫的负面影响;因此,有助于提高芝麻生产率。建议应用天然物质可通过调节渗透保护剂含量和抗氧化防御系统、增加植物器官中的矿质营养素和调节光合作用系统来克服干旱胁迫的负面影响;因此,有助于提高芝麻生产率。建议应用天然物质可通过调节渗透保护剂含量和抗氧化防御系统、增加植物器官中的矿质营养素和调节光合作用系统来克服干旱胁迫的负面影响;因此,有助于提高芝麻生产率。
更新日期:2020-03-01
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