‘中苜3号'紫花苜蓿对不同盐碱胁迫的生长和生理响应

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中图分类号：S541.9 文献标识码：A 文章编号：1007-0435（2026）02-0509-09

Abstract： To investigate the growth and metabolic adaptability of alfalfa（Medicago satiua L.）under salinealkali soil conditions，this experimentused‘Zhongmu No.3’ alfalfa cutings as the test material. Setup neutral salt stress ΔNaCl+Na2SO4， andalkaline saltstress ΔNa2CO3+NaHCO3） treatments，with three gradientlevels for each：light （0.3% soil salinity），moderate （0.6%） ，and severe （0.9%） .After 15days of stress，the growth physiological indicators of plant leaves and roots were measured.The results showed that alfalfa exhibited significant growth and physiological responses under saline-alkali stress.With increasing stressintensity， growth parameters under neutral salt treatment reached the lowest level under severe stress treatment （NS）， whereas alkaline salt treatment exhibited a gradual decrease in growth parameters as treatment intensity escalated．The sodium ion （Na+） content in the leaves and roots significantly increased under different treatments. The content of malondialdehyde（MDA） in the leaves significantly rose under moderate（NM） and NS neutral salt stress treatments；meanwhile，the MDA content in both roots and leaves significantly increased under various alkaline salt stresss.The proline（Pro） content in the roots significantly increased under diferent streses， while the activity of superoxide dismutase （SOD） first increased and then decreased as the stress level rose. This study reveals the growth and metabolic adaptation mechanisms of alfalfa under saline-alkali stress，providingresearch references for the breeding of salt-tolerant varieties.

Key words：Alfalfa; Saline-alkali stress ;Growth traits ;Physiological response

土壤盐碱化是在不利的气候、水文等自然条件以及过度放牧、盲目开垦等人为因素干扰下，易溶性盐类在土壤中重新分配、过量积累和扩散所形成的[1-2]。（剩余14387字）