Evaluation of Drought Resistance of 7 Fescue Germplasms at Bud Stage
In order to explore the stress ability of Fescue germplasm to stress during the bud stage,drought stress was simulated with different concentrations of PEG-6000(0,5%,10%,15%,20%,25%)using Festuca valesiaca,a new strain(FV)and common varieties of Festuca rubra Legend(CQ),Grassland(CY),Morpheus(MS),Northern(BF),Yushan(YS)and Duohua(DH)as mate-rials.Germination rate,germination potential,vitality index,radicle length,plumule length,radicle/plumule and other germination indexes were measured at the germination stage.The effects of drought on seed germination were analyzed.The drought resistance was evaluated by principal compo-nent analysis,membership function analysis and cluster analysis.The results showed that the high concentration of PEG(20%-25%)significantly decreased the germination potential,germination rate,germination index,vitality index,radicle length,radicle length and root to shoot ratio of Fescue germplasms,while the difference of 5%-15%PEG was different with different germplasms.Among them,0-10%PEG had an initiation effect on FV,BF and YS germination indexes.Comprehensive evaluation indicated that by principal component analysis,7 relative single trait indexes were trans-formed into 2 new comprehensive indexes,and the cumulative contribution rate was 85.06%.Accord-ing to the newly synthesized index,7 Fescue germpalsms were divided into 3 categories by member-ship function method combined with cluster analysis.Among them,FV,CQ and BF had strong drought resistance,CY and YS had average drought resistance,and MS and DH had weak drought resistance.
Festucabud stagedrought resistanceprinciple component analysismembership function methodPEG stress