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茉莉酸酯和水杨酸作为仙客来花衰老的神秘调控因子

Jasmonates and salicylic acid as enigmatic orchestrators of capitula senescence in Cav.

作者信息

Lone Mohammad Lateef, Farooq Sumira, Ul Haq Aehsan, Altaf Foziya, Parveen Shazia, Tahir Inayatullah

机构信息

Plant Physiology and Biochemistry Research Laboratory, Department of Botany, University of Kashmir, Srinagar, India.

出版信息

Physiol Mol Biol Plants. 2023 Dec;29(12):1863-1874. doi: 10.1007/s12298-023-01407-4. Epub 2023 Dec 23.

Abstract

The fine-tuning of the intricate network of plant growth hormones empowers the balanced responses of plants to environmental and developmental signals. Salicylic acid and jasmonates are emerging as advanced hormones that provide plants with resistance to environmental stresses. Senescence is characterized by coordinated and systematic crosstalk between phytohormones that remodels the biochemical and physiological mechanisms in plants, resulting in cell death. The present investigation examines the role of jasmonates (methyl jasmonate and jasmonic acid) and salicylic acid (SA) in regulating the petal senescence of detached stalks of . Based on our results, it was revealed that SA and jasmonic acid (JA) at 40 μM and methyl jasmonate (MJ) at 0.75 μM concentration delayed the senescence of detached flowers of considerably. These growth regulators improved the membrane stability, reinforced the antioxidant enzyme activities and averted the upsurge of hydrogen peroxide (HO) content in the petals. Additionally, SA and jasmonates preserved higher content of total phenols, reducing sugars and soluble proteins in the petals, besides impeding the bacterial growth in testing solutions which corroborated with the maximum solution uptake. The elevated soluble protein content was found to be associated with low specific protease activity (SPA) and α-amino acid content in the petal tissues. Our study concluded that SA and jasmonates delayed flower senescence by averting oxidative stress and maintaining the nutritional status of the petals.

摘要

植物生长激素复杂网络的精细调节使植物能够对环境和发育信号做出平衡反应。水杨酸和茉莉酸盐正成为为植物提供抗环境胁迫能力的高级激素。衰老的特征是植物激素之间协调且系统的相互作用,这种相互作用重塑了植物的生化和生理机制,导致细胞死亡。本研究考察了茉莉酸盐(茉莉酸甲酯和茉莉酸)和水杨酸(SA)在调节[具体植物名称]离体花茎花瓣衰老中的作用。基于我们的结果,发现40μM的SA和茉莉酸(JA)以及0.75μM浓度的茉莉酸甲酯(MJ)显著延迟了[具体植物名称]离体花朵的衰老。这些生长调节剂提高了膜稳定性,增强了抗氧化酶活性,并避免了花瓣中过氧化氢(HO)含量的激增。此外,SA和茉莉酸盐除了抑制测试溶液中的细菌生长(这与最大溶液吸收量相关)外,还在花瓣中保留了较高含量的总酚、还原糖和可溶性蛋白质。发现花瓣组织中可溶性蛋白质含量升高与低特异性蛋白酶活性(SPA)和α-氨基酸含量有关。我们的研究得出结论,SA和茉莉酸盐通过避免氧化应激和维持花瓣的营养状态来延迟花朵衰老。

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