Khan Imran, Muhammad Awon, Chattha Muhammad Umer, Skalicky Milan, Bilal Chattha Muhammad, Ahsin Ayub Muhammad, Rizwan Anwar Muhammad, Soufan Walid, Hassan Muhammad Umair, Rahman Md Atikur, Brestic Marian, Zivcak Marek, El Sabagh Ayman
Department of Agronomy, University of Agriculture, Faisalabad, Pakistan.
Department of Botany and Plant Physiology, Faculty of Agrobiology, Food, and Natural Resources, Czech University of Life Sciences Prague, Prague, Czechia.
Front Plant Sci. 2022 Apr 26;13:840900. doi: 10.3389/fpls.2022.840900. eCollection 2022.
Salinity stress is one of the major global problems that negatively affect crop growth and productivity. Therefore, ecofriendly and sustainable strategies for mitigating salinity stress in agricultural production and global food security are highly demandable. Sugarcane press mud (PM) is an excellent source of the organic amendment, and the role of PM in mitigating salinity stress is not well understood. Therefore, this study was aimed to investigate how the PM mitigates salinity stress through the regulation of rice growth, yield, physiological properties, and antioxidant enzyme activities in fine rice grown under different salinity stress conditions. In this study, different levels of salinity (6 and 12 dS m) with or without different levels of 3, 6, and 9% of SPM, respectively were tested. Salinity stress significantly increased malondialdehyde (MDA, 38%), hydrogen peroxide (HO, 74.39%), Na (61.5%), electrolyte leakage (40.32%), decreased chlorophyll content (32.64%), leaf water content (107.77%), total soluble protein (TSP, 72.28%), and free amino acids (FAA, 75.27%). However, these negative effects of salinity stress were reversed mainly in rice plants after PM application. PM application (9%) remained the most effective and significantly increased growth, yield, TSP, FAA, accumulation of soluble sugars, proline, K, and activity of antioxidant enzymes, namely, ascorbate peroxidase (APX), catalase (CAT), and peroxidase (POD). Thus, these findings suggest a PM-mediated eco-friendly strategy for salinity alleviation in agricultural soil could be useful for plant growth and productivity in saline soils.
盐胁迫是影响作物生长和生产力的主要全球性问题之一。因此，在农业生产和全球粮食安全中，减轻盐胁迫的生态友好型和可持续策略非常必要。甘蔗滤泥（PM）是一种优质的有机改良剂，但人们对其在减轻盐胁迫方面的作用了解甚少。因此，本研究旨在探讨PM如何通过调节不同盐胁迫条件下精细水稻的生长、产量、生理特性和抗氧化酶活性来减轻盐胁迫。在本研究中，分别测试了不同水平的盐度（6和12 dS m）以及添加不同水平（3%、6%和9%）SPM的情况。盐胁迫显著增加了丙二醛（MDA，38%）、过氧化氢（HO，74.39%）、钠（Na，61.5%）、电解质渗漏（40.32%），降低了叶绿素含量（32.64%）、叶片含水量（107.77%）、总可溶性蛋白（TSP，72.28%）和游离氨基酸（FAA，75.27%）。然而，施用PM后，这些盐胁迫的负面影响在水稻植株中主要得到了逆转。施用9%的PM仍然是最有效的，显著提高了生长、产量、TSP、FAA、可溶性糖、脯氨酸、钾的积累以及抗氧化酶即抗坏血酸过氧化物酶（APX）、过氧化氢酶（CAT）和过氧化物酶（POD）的活性。因此，这些发现表明，PM介导的农业土壤盐度缓解生态友好策略可能对盐渍土壤中的植物生长和生产力有益。
