中国草地学报2026，Vol.48Issue(4)：1-14,14.DOI:10.16742/j.zgcdxb.20250447
狗牙根新品系种子萌发期及苗期耐盐性评价
Evaluation of Salt Tolerance in New Bermudagrass Lines at Seed Germination and Seedling Stages
摘要
Abstract
To evaluate the differences in salt tolerance among new lines of bermudagrass(Cynodon dactylon),identify key indicators for salt tolerance assessment,and thereby facilitate the breeding of new salt-tolerant cultivars,this study used 'Xinnong No.1' bermudagrass as the control.Three new lines(C138,C22,C63)were subjected to NaCl stress at concentrations of 0.5%,1.0%,1.5%,2.0%,and 2.5%dur-ing both seed germination and seedling stages.Germination,growth,and physiological parameters were measured.A comprehensive evaluation of salt tolerance was conducted by integrating the entropy-weighted TOPSIS method,membership function analysis,and the Comprehensive Salt Tolerance Index(CSI).The results indicated that salt stress significantly inhibited seed germination and seedling growth of bermudag-rass,with clear differential tolerance observed among the lines.C138 demonstrated the best performance across both stages,maintaining relatively high levels of germination rate,vigor index,aboveground bio-mass,and leaf relative water content under salt stress.C63 performed well under low to moderate salinity(≤1.0%).The entropy-weighted TOPSIS analysis revealed that germination potential and vigor index were major contributing factors during the germination stage,whereas aboveground and belowground bio-mass were key during the seedling stage.Based on the combined analysis of the membership function and CSI,the salt tolerance of the four bermudagrass materials was consistently ranked(from strongest to weak-est)as follows:C138,C63,'Xinnong No.1' bermudagrass,and C22.In summary,C138 exhibits strong compre-hensive salt tolerance and shows promise as an excellent material for saline-alkali land improvement,while C63 is suitable for mildly saline environments.These findings provide a basis for the breeding and promotion of salt-tolerant bermudagrass varieties.关键词
狗牙根/盐胁迫/萌发期/苗期/综合评价/耐盐指标Key words
Cynodon dactylon/salt stress/germination stage/seedling stage/comprehensive evalua-tion/salt tolerance indicators分类
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郭锦华,孙宗玖,李培英,张勇娟,伊丽姆努尔·阿不都热合曼..狗牙根新品系种子萌发期及苗期耐盐性评价[J].中国草地学报,2026,48(4):1-14,14.基金项目
新疆维吾尔自治区重点研发项目(2023B02031) （2023B02031）
