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Jasmonates mediate plant defense responses to Spodoptera exigua herbivory in tomato and maize foliage
Plant Signaling & Behavior ( IF 2.8 ) Pub Date : 2020-04-14 , DOI: 10.1080/15592324.2020.1746898
Wafaa Al-Zahrani 1 , Sameera O Bafeel 1 , Manal El-Zohri 1, 2
Affiliation  

ABSTRACT Plants evolve diverse strategies to cope with herbivorous insects, in which the lipid-derived phytohormone jasmonic acid (JA) plays a crucial role. This study was conducted to investigate the differential responses of tomato and maize plants to Spodoptera exiguaherbivory and to clarify the role played by JA, methyl-jasmonate (MeJA) and jasmonoyl-L-isoleucine (JA-L-Ile) in their defense responses. JA, MeJA and JA-L-Ile were quantified using HPLC-MS/MS. The results showed that maize plant was more tolerant toS. exiguaherbivory than tomato. Spodopteraexigua attack induced JA, MeJA, and JA-L-Ile to high levels after 2 h of infestation in both test plants. Then, all studied JAsconcentration decreased gradually by increasing infestation time up to 1 week. JA concentration in infested maize was much higher than that in infested tomato leaves. However, MeJA concentration in infested tomato leaves was higher than that in maize. In control plants, JA was not recorded, while MeJA was recorded in comparable values both in tomato and maize. Our results showed that JA plays the main role in increasing defense responses to S. exigua infestation in the studied plants as a direct signaling molecule; however, MeJA could play an indirect role by inducing JA accumulation. JA-L-Ile indicated a less efficient role in defense responses to S. exigua attack in both test plants where its level is much lower than JA and MeJA.

中文翻译:

茉莉酸介导番茄和玉米叶中甜菜夜蛾的植物防御反应

摘要 植物进化出多种策略来应对食草昆虫,其中脂质衍生的植物激素茉莉酸 (JA) 起着至关重要的作用。本研究旨在调查番茄和玉米植物对甜菜夜蛾的不同反应,并阐明 JA、茉莉酸甲酯 (MeJA) 和茉莉酰-L-异亮氨酸 (JA-L-Ile) 在其防御反应中的作用。JA、MeJA 和 JA-L-Ile 使用 HPLC-MS/MS 进行定量。结果表明,玉米植株对S的耐受性更强。exiguaherbivivory 比番茄。在两种测试植物中侵染 2 小时后,甜菜夜蛾攻击将 JA、MeJA 和 JA-L-Ile 诱导至高水平。然后,所有研究的 JAs 浓度通过将侵染时间增加到 1 周而逐渐降低。受侵染玉米中的 JA 浓度远高于受侵染番茄叶片中的 JA 浓度。然而,受侵染的番茄叶片中的 MeJA 浓度高于玉米。在对照植物中,没有记录 JA,而在番茄和玉米中以可比较的值记录了 MeJA。我们的结果表明,JA 作为直接信号分子,在增加对所研究植物中甜菜夜蛾侵染的防御反应中起主要作用;然而,MeJA 可以通过诱导 JA 积累发挥间接作用。JA-L-Ile 表明在两个试验植物中对 S. exigua 攻击的防御反应效率较低,其水平远低于 JA 和 MeJA。作为直接信号分子在研究植物中的 exigua 侵染;然而,MeJA 可以通过诱导 JA 积累发挥间接作用。JA-L-Ile 表明在两个试验植物中对 S. exigua 攻击的防御反应效率较低,其水平远低于 JA 和 MeJA。作为直接信号分子在研究植物中的 exigua 侵染;然而,MeJA 可以通过诱导 JA 积累发挥间接作用。JA-L-Ile 表明在两个试验植物中对 S. exigua 攻击的防御反应效率较低,其水平远低于 JA 和 MeJA。
更新日期:2020-04-14
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