干旱胁迫对2种独行菜种子萌发和幼苗生长的影响

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中图分类号：S649 文献标识码：A

doi：10.13601/j.issn.1005-5215.2025.05.002

EffectsofDroughtStresson Seed Germinationand SeedlingGrowth ofTwoSpeciesofLepidium

Li Gang1，Jiang Shengxiu2*，Zhao Peng² （1.Grassland Workstation in Liangzhou District of Wuwei City，Wuwei 733ooo，China; 2.Gansu Desert Control Research Institute，Lanzhou 73oo70，China）

AbstractComparingtheresponseofsedgerminationoftwoLepidiumspeciestodroughtstresscanprovideatheoreticalbasisfor vegetationrestorationindesertareas.Thegerminationategerminationpotential，germinationindexandvigorindexofLepidium apetalumandLepidiumlatifiumseeds treatedwithdiferentmassfractionsofpolyethyleneglycol6Ooo（EG6oO）weredeteined. Theresultsshowedasthefolowingthreeaspects.（1）WiththeincreaseofPEG6oomassfraction，thegerminationrateand germination potentialof thetwo speciesofLepidiumseedsdecreased gradually，andwhenthemassfractionofPEG6o was more than 16% ，Lepidium latifoliumcouldnotgerminateatallThegerminationindexandvigorindexofLepidiumapetalumseeds were significantlydecreased by 24% PEG6000，and the germination index andvigor indexof Lepidium latifolium seedsweresignificantly increased by 4% and 8% PEG6000.（2）PEG600O stress reduced the germination rate of two species of Lepidium seeds，delayed the initial germinationtimeofseeds，ndprolongedthegerminationtimeofseeds.（3）WhenthemassfractionofEG6oo0wasorethan 8% ，the seedling growth of the two species of Lepidium was significantly inhibited.

KeyWordsLepidiumapetalum;Lepidium latifolium;droughtstress;germinationrate

植物在整个生命周期中会遭受各种环境胁迫，如寒冷、干旱和土壤盐渍化等。（剩余5593字）