Jan Amin Ullah, Hadi Fazal, Nawaz Muhammad Asif, Rahman Khaista
Department of Biotechnology, Faculty of Sciences, Shaheed Benazir Bhutto University Sheringal Dir Upper, 18800, Pakistan.
Department of Biotechnology, Faculty of Biological Sciences, University of Malakand, Chakdara, 18800, Pakistan.
Plant Physiol Biochem. 2017 Jul;116:139-149. doi: 10.1016/j.plaphy.2017.05.008. Epub 2017 May 20.
Potassium and zinc are essential elements in plant growth and metabolism and plays a vital role in salt stress tolerance. To investigate the physiological mechanism of salt stress tolerance, a pot experiment was conducted. Potassium and zinc significantly minimize the oxidative stress and increase root, shoot and spike length in wheat varieties. Fresh and dry biomass were significantly increased by potassium followed by zinc as compared to control C. The photosynthetic pigment and osmolyte regulator (proline, total phenolic, and total carbohydrate) were significantly enhanced by potassium and zinc. Salt stress increases MDA content in wheat varieties while potassium and zinc counteract the adverse effect of salinity and significantly increased membrane stability index. Salt stress decreases the activities of antioxidant enzymes (superoxide dismutase, catalase and ascorbate peroxidase) while the exogenous application of potassium and zinc significantly enhanced the activities of these enzymes. A significant positive correlation was found of spike length with proline (R = 0.966 ), phenolic (R = 0.741) and chlorophyll (R = 0.853). The MDA content showed significant negative correlation (R = 0.983) with MSI. It is concluded that potassium and zinc reduced toxic effect of salinity while its combine application showed synergetic effect and significantly enhanced salt tolerance.
钾和锌是植物生长和代谢中的必需元素，在耐盐胁迫方面起着至关重要的作用。为了研究耐盐胁迫的生理机制，进行了盆栽试验。钾和锌能显著降低氧化应激，并增加小麦品种的根、茎和穗长度。与对照C相比，钾处理后鲜生物量和干生物量显著增加，其次是锌处理。钾和锌显著提高了光合色素和渗透调节物质（脯氨酸、总酚和总碳水化合物）的含量。盐胁迫会增加小麦品种中的丙二醛含量，而钾和锌可抵消盐度的不利影响，并显著提高膜稳定性指数。盐胁迫会降低抗氧化酶（超氧化物歧化酶、过氧化氢酶和抗坏血酸过氧化物酶）的活性，而外源施用钾和锌可显著提高这些酶的活性。穗长与脯氨酸（R = 0.966）、酚类物质（R = 0.741）和叶绿素（R = 0.853）之间存在显著正相关。丙二醛含量与膜稳定性指数呈显著负相关（R = 0.983）。得出的结论是，钾和锌降低了盐度的毒性作用，而它们的联合施用显示出协同效应，并显著提高了耐盐性。
