Exogenous naphthaleneacetic acid alleviated alkalinity-induced morpho-physio-biochemical damages in Cyperus esculentus L. var. sativus Boeck

作者：Abd Ullah, Fanjiang Zeng, Akash Tariq, Muhammad Ahsan Asghar, Khansa Saleem, Ali Raza, Muhammad Asad Naseer, Zhihao Zhang, Javaria Noor · 发表于：Frontiers in Plant Science · 年份：2022 · DOI：10.3389/fpls.2022.1018787 · 被引用次数：18 · 研究领域：Botany, Ecology, and Taxonomy Studies、Plant responses to water stress、Flowering Plant Growth and Cultivation

Cyperus esculentus L. var. sativus Boeck (commonly called Chufa) is a perennial species that produces nutritious underground tubers and contributes to the diet and health of human worldwide. However, it is salt-sensitive and its adaptation to salinity stress remains an enigma. Naphthaleneacetic acid (NAA) plays a vital role in regulating plant salt stress tolerance. Thus, we aimed to investigate the impact of NAA (150 mg/L) application on growth and physio-biochemical response mechanisms of Chufa plants to different levels of salinity stress (0-, 90-, and 180 mM of alkaline stress ([1:1 ratio of Na 2 CO 3 and NaHCO 3 ]). In response to increasing stress levels, shoot-root growth decreased, whereas malondialdehyde (MDA), hydrogen peroxide (H 2 O 2 ), osmolytes (soluble protein, proline, and soluble sugars), and activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) significantly increased. Alkalinity led to significant increase in Na + and Cl – , but decrease in Mg 2+ concentration in both roots and leaves; however, K + decreased significantly in leaves under both stresses. Additionally, NO 3 − and. levels, nitrate reductase (NR) activities, and glutamate synthase (GOGAT) decreased significantly. However, glutamine synthetase (GS) increased non-significantly at 90 mM but declined at 180 mM. Foliar NAA application reduced Na + and Cl - , MDA, and H 2 O 2 but increased photosynthetic pigments, K + and Mg 2+ , osmolytes, nitrogen (N) metabolism...