ABSTRACT In the present study, effects of foliar application of 150 µM Jasmonic acid (JA), an endogenous plant growth regulator, on alleviation oxidative stress resulted from without (0 mM), low (50 mM), moderate (150 mM), and high (300 mM) NaCl in bitter melon (Momordica charantia) seedlings was investigated. High salt stress significantly decreased growth components including root length, leaf morphological properties, leaf water content, plant biomass and levels of pigments, soluble sugars, starch and proteins, but accumulated higher amounts of proline, free amino acids and the activities of ascorbate peroxidase (APX), catalase (CAT), polyphenol oxidase (PPO) and pyrogallol peroxidase (PPX). Exogenous JA treatment alone or combined with salt stress improved growth components with hyperaccumulation of soluble sugars, proteins, amino acids, proline and PPO activity, but was associated with a decrease in the activity of H2O2-decomposing enzymes. These results suggest that exogenous JA treatment can effectively raise salt stress tolerance of bitter melon seedlings through modifying allocation of carbon and nitrogen metabolism to adjust levels of metabolites and directing them to the growth processes.

中文翻译：

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茉莉酸对盐胁迫下苦瓜幼苗的代谢反应

摘要 在本研究中，叶面喷施 150 µM 茉莉酸 (JA)（一种内源性植物生长调节剂）对缓解氧化应激的影响来自无（0 mM）、低（50 mM）、中等（150 mM）和研究了苦瓜 (Momordica charantia) 幼苗中的高 (300 mM) NaCl。高盐胁迫显着降低了生长成分，包括根长、叶片形态特性、叶片含水量、植物生物量和色素、可溶性糖、淀粉和蛋白质的水平，但积累了更多的脯氨酸、游离氨基酸和抗坏血酸过氧化物酶的活性。 APX)、过氧化氢酶 (CAT)、多酚氧化酶 (PPO) 和连苯三酚过氧化物酶 (PPX)。单独或与盐胁迫结合的外源 JA 处理改善了生长成分，可溶性糖、蛋白质、氨基酸、脯氨酸和 PPO 活性，但与 H2O2 分解酶的活性降低有关。这些结果表明，外源JA处理可以通过改变碳和氮代谢的分配来调节代谢物水平并将其引导至生长过程，从而有效地提高苦瓜幼苗的盐胁迫耐受性。