NaCI胁迫下果园适生草种萌发及幼苗的生理响应机制

打开文本图片集

中图分类号：S66 文献标识码：A 文章编号：2095-5774（2025）05-0450-07

Abstract：【Objective】This studycompared the seed germination and seedling growth parameters offour grassspecies， namely Lotus corniculatus，Loliumperenne，Festuca elata，and Agrostis clavata.Salt-tolerant grassspecies were screened out to provide experimentalbasis forthe practiceof inter-row grassgrowing insaline-alkalisoils.【Method】Inthis study， fourseeds ofLotuscorniculatus，Loliumperenne，FestucaelataandAgrostisclavata wereselectedtoanalyzetheeffctsofO， 50and10O mmol/L NaClon the growth performance，germination rate，seeding fresh weight，soluble protein content， antioxidant enzyme（SOD，POD）activities and malondialdehyde（MDA）contentofthese four seeds.The objective of this study was to screen grassspecies suitable for cultivation in the inter-row spaces of economic forests insaline-alkali regions.【Result】5O mmol/LNaCl significantly increased the germination rateof Lotus corniculatus，but significantly decreased thatofFestuca elata.However，thegerminationrateofFestuca elata was higherthanthatoftheother three species.NaClinhibited thefresh weightof seedlings of allfour speciesand significantlyincreasing thesoluble protein contentinFestucaelataseedlings.5Ommol/LNaClsignificantlyenhancedtheSODactivityinLotus corniculatussedlings， whileexertingno significantly efectonthe seedings of theother threespecies.NaCl stressignificantly elevated POD activityin Lolium perenne.seedlings，with no significant impactontheseedings of theother threespecies.After NaCl stress，theMDAcontentinseedlingsofLotuscorniculatus，FestucaelataandAgrostisclavataremainedrelativelytable without significant fluctuations.【Conclusion】Among the four grass speciessuitable for orchard growth，Festuca elata exhibitedthehighestgerminationrate.Aftertreatment with5Ommol/LNaCl，itshowednosignificantdecreaseinfresh weight，a significant increase insoluble proteincontent，andrelativelystable SOD，PODactivities，and MDAcontent. These characteristics indicate that Festuca elata has better salt tolerance.

Keywords：NaCl stress; adaptable grass species; enzyme activity;saline-sodic soil; salt tolerance; Festuca elata

土壤盐碱化是全球性的生态问题之一。（剩余9002字）