Objective This study aims to systematically screen salt-tolerant cucumber mutants from the ethyl methanesulfonate (EMS) mutant library,thereby providing germplasm resources for exploring salt tole-rance mechanisms and variety improvement in cucumber. Method The wild-type cucumber HS9320 and 28 cucumber mutants were selected as experimental materials,and salt stress was simulated with 100 mmol/L NaCl solution.Salt-tolerant mutants were screened by analyzing growth indices,contents of soluble sugar,soluble protein,proline,malondialdehyde,as well as activities of antioxidant enzymes including SOD,POD and CAT. Result Under salt stress,the 28 cucumber mutants at seedling stage exhibited varying degrees of growth changes.The reductions in shoot and root fresh weight of highly salt-tolerant mutants M324-2-1 and M369-6-2 were lower than those of wild-type HS9320,with their shoot and root fresh weight decreasing by 31.18% and 19.94%,22.07% and 25.05% compared with the control,respectively.These salt-tolerant mutants exhibited higher leaf soluble protein content as well as SOD and CAT activities than the control,whereas salt-sensitive mutant M391-1-1 showed significant reductions in leaf soluble protein content and POD activity.These findings suggest that salt-tolerant mutants can mitigate salt-induced damage by accumulating osmotic adjustment substances and increasing antioxidant enzyme activities. Conclusion Through salt tolerance experiments on cucumber mutant seedlings,four highly salt-tolerant and nine salt-tolerant mutants were screened,namely M324-2-1,M369-6-2,M112-6-1,M68-3-2,as well as M59-8-1,M7-6-1,M30-5-1,M389-9-1,M378-6-2, M324-2-3,M132-7-1,M378-6-3 and M9-2-2.
LiT L.Development status of China’ s facility vegetable industry and outlook[J].China Vegetables,2023(9):1-6.
[4]
ZhangF, ZhangJ, LiQ,et al.Exploring candidate genes and regulatory mechanisms for salt-alkali tolerance in cucumber[J].Agronomy,2024,14(3):543.
[5]
ZhouY X, FengC, WangY N,et al.Understanding of plant salt tolerance mechanisms and application to molecular breeding[J].International Journal of Molecular Sciences,2024,25(20):10940.
LiuD R, DongS Y, MiaoH,et al.Research progress on genetic breeding of cucumber tolerance for salt stress[J].China Ve-getables,2021(7):14-23.
[8]
GadM, NobuhiroS, SultanC,et al.Reactive oxygen species homeostasis and signalling during drought and salinity stresses[J].Plant,Cell & Environment,2010,33(4):453-467.
[9]
ZhouH P, ShiH F, YangY Q,et al.Insights into plant salt stress signaling and tolerance[J].Journal of Genetics and Genomics,2023,51(1):16-34.
YanM Y, KangQ S, YuanW G,et al.Phenotypic screening of EMS mutants in watermelon and genetic dissection of dwarf mutant[J].China Cucurbits and Vegetables,2025,38(4):28-34.
YueZ, GuoC S, HouY J,et al.Screening and identification of the salt-tolerant materials of watermelon mutant library[J].Journal of Northwest A&F University(Natural Science Edition),2026,54(4):74-81,91.
PanQ, ZhangS Y, ShenD,et al.Screening and identification of salt tolerant mutant of cucumber[J].Journal of Nanjing Agricultural University,2018,41(1):64-70.
[20]
薛伟.EMS诱变黄瓜突变体库构建及表型分析[D].长春:吉林农业大学,2023.
[21]
XueW.EMS mutagenic cucumber mutant construction and phenotypic analysis[D].Changchun:Jilin Agricultural University,2023.
[22]
赵世杰,苍晶.植物生理学实验指导[M].北京:中国农业出版社,2015:76-80.
[23]
ZhaoS J, CangJ.Guidance of plant physiology experiment [M].Beijing:China Agriculture Press,2015:76-80.