Thepbandit Wannaporn, Srisuwan Anake, Athinuwat Dusit
Faculty of Science and Technology, Thammasat University, Pathumtani 12121, Thailand.
Faculty of Science and Technology, Nakhon Ratchasima Rajabhat University, Nakhon Ratchasima 30000, Thailand.
Antioxidants (Basel). 2024 Aug 30;13(9):1055. doi: 10.3390/antiox13091055.
This study explores the impact of exogenous salicylic acid (SA) alongside conventional treatment by farmers providing positive (Mancozeb 80 % WP) and negative (water) controls on rice plants ( L.), focusing on antioxidant enzyme activities, phytohormone levels, disease resistance, and yield components under greenhouse and field conditions. In greenhouse assays, SA application significantly enhanced the activities of peroxidase (POX), polyphenol oxidase (PPO), catalase (CAT), and superoxide dismutase (SOD) within 12-24 h post-inoculation (hpi) with . Additionally, SA-treated plants showed higher levels of endogenous SA and indole-3-acetic acid (IAA) within 24 hpi compared to the controls. In terms of disease resistance, SA-treated plants exhibited a reduced severity of rice blast under greenhouse conditions, with a significant decrease in disease symptoms compared to negative control treatment. The field study was extended over three consecutive crop seasons during 2021-2023, further examining the efficacy of SA in regular agricultural practice settings. The SA treatment consistently led to a reduction in rice blast disease severity across all three seasons. Yield-related parameters such as plant height, the number of tillers and panicles per hill, grains per panicle, and 1000-grain weight all showed improvements under SA treatment compared to both positive and negative control treatments. Specifically, SA-treated plants yielded higher grain outputs in all three crop seasons, underscoring the potential of SA as a growth enhancer and as a protective agent against rice blast disease under both controlled and field conditions. These findings state the broad-spectrum benefits of SA application in rice cultivation, highlighting its role not only in bolstering plant defense mechanisms and growth under greenhouse conditions but also in enhancing yield and disease resistance in field settings across multiple crop cycles. This research presents valuable insights into the practical applications of SA in improving rice plant resilience and productivity, offering a promising approach for sustainable agriculture practices.
本研究探讨了外源水杨酸（SA）与农民常规处理（提供阳性对照（80%代森锰锌可湿性粉剂）和阴性对照（水））对水稻植株的影响，重点关注温室和田间条件下的抗氧化酶活性、植物激素水平、抗病性和产量构成因素。在温室试验中，接种后12 - 24小时内，施用SA显著提高了过氧化物酶（POX）、多酚氧化酶（PPO）、过氧化氢酶（CAT）和超氧化物歧化酶（SOD）的活性。此外，与对照相比，SA处理的植株在接种后24小时内内源SA和吲哚 - 3 - 乙酸（IAA）水平更高。在抗病性方面，SA处理的植株在温室条件下稻瘟病严重程度降低，与阴性对照处理相比，病害症状显著减轻。田间研究在2021 - 2023年连续三个作物季进行，进一步检验了SA在常规农业实践中的效果。SA处理在所有三个季节均持续降低了稻瘟病的严重程度。与阳性和阴性对照处理相比，SA处理下的株高、每蔸分蘖数和穗数、每穗粒数以及千粒重等产量相关参数均有所改善。具体而言，SA处理的植株在所有三个作物季的谷物产量更高，突出了SA在可控和田间条件下作为生长促进剂和稻瘟病防护剂的潜力。这些发现表明了SA在水稻种植中的广谱益处，强调了其不仅在温室条件下增强植物防御机制和促进生长方面的作用，还在多个作物周期的田间环境中提高产量和抗病性方面的作用。本研究为SA在提高水稻植株抗性和生产力方面的实际应用提供了有价值的见解，为可持续农业实践提供了一种有前景的方法。
