Adaptive strategy of Nitraria sibirica to transient salt,alkali and osmotic stresses via the alteration of Na+/K+fluxes around root tips  

作　　者：Xindi Mei Ting Dai Yingbai Shen 

机构地区：[1]Xinjiang Key Laboratory of Biological Resources and Genetic Engineering,College of Life Science and Technology,Xinjiang University,Urumqi 830046,People’s Republic of China [2]National Engineering Laboratory for Tree Breeding,Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants,Ministry of Education,The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of National Forestry and Grassland Administration,College of Biological Sciences and Biotechnology,Beijing Forestry University,Beijing 100083,People’s Republic of China

出　　处：《Journal of Forestry Research》2023年第2期425-432,共8页林业研究（英文版）

基　　金：supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region(No.2019D01C069);Natural Science Foundation of Xinjiang University(No.62031224614)。

摘　　要：Nitraria sibirica Pall.is an important shrub with a strong salt-alkali tolerance,but the mechanism underlying this tolerance remains obscure.In this study,N.sibirica,with salt-sensitive Vigna radiata(Linn.)Wilczek as the control,was subjected to transient salt stress(100 mM NaCl),alkali stress(50 mM Na_(2)CO_(3)),and osmotic stress(175 mM mannitol).The ionic fluxes of Na^(+)and K^(+)in the root apical region were measured.Results show that,under salt and alkali stress,N.sibirica roots exhibited higher capacities to limit Na+influx and reduce K+efflux,thereby resulting in lower Na^(+)/K^(+)ratios compared with V.radiata roots.Alkali stress induced stronger Na^(+)influx and K+efflux in the root salt stress treatment;Na^(+)influx was mainly observed in the root cap,while K^(+)efflux was mainly observed in the elongation zone.While under osmotic stress,N.sibirica roots showed stronger Na+efflux and weaker K+efflux than V.radiata roots.Na+efflux was mainly observed in the root elongation zone,while K+efflux was in the root cap.These results reveal the ionic strategy of N.sibirica in response to transient salt,alkali,and osmotic stresses through the regulation of Na+/K+flux homeostasis.

关 键 词：Nirtaria sibirica Na^(+)/K^(+)fl uxes Na^(+)/K^(+)ratios Salt stress Alkali stress Osmotic stress 

分 类 号：S793.9[农业科学—林木遗传育种]