50份多花黑麦草种质耐盐性评价

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中图分类号：S443十.6 文献标识码：A 文章编号：1007-0435（2026）01-0239-15

Abstract：To screen out high-quality salt-tolerant Lolium multiflorum germplasm resources，the salt tolerance of 50 accessions ofLolium multiflorum with different ploidy levels were evaluated in this study.Underdiferent NaCl concentration treatments of 0，50，100，150，200 and 250 mmol L-1 ， the root length，shoot length，germination rate，germination potential，germination index，and vigor index after seed germination were measued. Salt tolerance of the experimental materials was assessed by using corelation analysis and other methods.The results showed that theD values of the 5O materials ranged from O.O37 to O.972.Ata Euclidean distance of 13.5，the 5O accessions were clasified into1 salt-tolerant accession，9 moderately salt-tolerant accessions，15 moderately salt-sensitive accessions，and 25 salt-sensitive accessions. Salt stress treatment of the screened extreme materials with diferent ploidy at the seedling stage showed that both plant height and biomass were inhibited，while relative Water content and chlorophyllcontent were decreased，indicating that plant growth and physiological processes were suppressed under salt stress. Comprehensive comparison between the seed germinationand seedling stages revealed that tetraploid Lolium multiflorum germplasm exhibited better salt tolerance than diploid materials.The findings provide theoretical support for breeding salt-tolerant Lolium multiflorum materials.

Key Words：Lolium multiflorum;Salinity stress;Germination period;Seedling stage;Physiological characteristic

盐分在土壤中的积累对牧草的发育和产量构成了主要的生态限制，对我国农业持续性发展带来严峻挑战1。（剩余19096字）