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草业学报 ›› 2026, Vol. 35 ›› Issue (6): 24-34.DOI: 10.11686/cyxb2025262

• 研究论文 • 上一篇    下一篇

紫花苜蓿新品系对盐胁迫的响应

任孟雨(), 王利群, 南丽丽(), 郭佳雨   

  1. 甘肃农业大学草业学院,草业生态系统教育部重点实验室,农业农村部饲草种质与新品种选育重点实验室[部省共建],甘肃 兰州 730070
  • 收稿日期:2025-06-26 修回日期:2025-07-21 出版日期:2026-06-20 发布日期:2026-04-13
  • 通讯作者: 南丽丽
  • 作者简介:Corresponding author. E-mail: nanll@gsau.edu.cn
    任孟雨(2001-),男,河北邯郸人,在读硕士。E-mail: miss758250@qq.com
  • 基金资助:
    甘肃省重大专项(25ZDNA005)

Responses of new alfalfa lines to salt stress

Meng-yu REN(), Li-qun WANG, Li-li NAN(), Jia-yu GUO   

  1. College of Pratacultural Science,Gansu Agricultural University,Key Laboratory of Grassland Ecosystem,Ministry of Education,Key Laboratory of Forage Germplasm Innovation and New Variety Breeding of Ministry of Agriculture and Rural Affairs,Lanzhou 730070,China
  • Received:2025-06-26 Revised:2025-07-21 Online:2026-06-20 Published:2026-04-13
  • Contact: Li-li NAN

摘要:

为探讨紫花苜蓿新品系在盐胁迫下的变化及响应机制,以5份苜蓿新品系(P1、P2、P3、P4、P5)及中苜1号紫花苜蓿(ZM)为研究对象,在盐胁迫(200?mmol·L-1 NaCl)下分别处理0(CK)、8与16?d后测定其开花期形态、生理等指标。结果表明:随盐胁迫时间的延长,供试苜蓿的株高、叶面积、地上生物量、地下生物量和地上部及地下部K+含量呈降低趋势。同时,盐胁迫也抑制了供试苜蓿根系的生长,根总长、根总表面积、根平均直径、根体积和根尖数均降低。而总黄酮含量,苯丙氨酸解氨酶、肉桂酸-4-羟基化酶、4-香豆酸辅酶A连接酶活性和地上部及地下部Na+含量均增加。主成分分析表明,地下部K+及Na+含量、根尖数、株高与叶面积可视为评估苜蓿开花期耐盐性的关键指标。隶属函数综合评价表明,供试苜蓿耐盐性排名为P3>P4>P5>ZM>P2>P1。综上所述,P3为耐盐胁迫品系,P1为盐胁迫敏感品系。

关键词: 紫花苜蓿, 耐盐性, 黄酮, 苯丙氨酸解氨酶

Abstract:

In this study, we explored the responses of five new alfalfa (Medicago sativa) lines (P1, P2, P3, P4, and P5) and M. sativa cv. ‘Zhongmu’ No.1 (ZM) to salt stress. The morphological and physiological parameters of alfalfa in the early flowering stage were measured at 0 (CK), 8, and 20 days under salt stress (200?mmol·L-1 NaCl). The results show that with the extension of salt stress, there was increasing inhibition of plant height, leaf area, aboveground biomass, underground biomass, and K+ content of aboveground and underground parts of alfalfa plants. Salt stress also inhibited the growth of the root system of alfalfa plants, with negative effects on the total root length, total root surface area, average root diameter, root volume, and root tip number. The total flavonoid content and the activities of phenylalanine ammonia-lyase, cinnamic acid-4-hydroxylase, and 4-coumarate-coenzyme A ligase were increased under salt stress, as were the Na+ contents in the aboveground and underground parts. Principal component analysis revealed that underground K+ and Na+ contents, root tip number, plant height, and leaf area are the preferred indices for evaluating the salt tolerance of alfalfa at the early flowering stage. On the basis of a comprehensive evaluation with the membership function method, the M. sativa lines were ranked from most to least salt tolerant as follows: P3>P4>P5>ZM>P2>P1. These findings provide a theoretical basis for breeding new salt-resistant alfalfa cultivars.

Key words: alfalfa, salt tolerance, flavones, phenylalanine ammonia-lyase