Variability in Drought Resistance During Seed Germination among 34 Pennisetum alopecuroides Gerplasms
To evaluate drought resistance and identify promising germplasm resources,this study inves-tigated the seed germination characteristics of 34 Pennisetum alopecuroides varieties under polyethylene gly-col(PEG-6000)induced drought.Membership function and cluster analysis were employed to comprehen-sively evaluate drought resistance during seed germination.The results showed that compared to the con-trol,5%PEG-6000 concentration exhibited a stimulatory effect,with significantly increased germination rate and index(P<0.05).However,higher PEG-6000 concentration exhibited a progressive inhibitory effect on germination(P<0.05).Plumule length displayed greater sensitivity to drought stress than radicle length,with both decreasing as PEG concentration increased.Fifteen percent of PEG-6000 was determined as suitable for drought resistance evaluation based on the measured parameters.The compre-hensive evaluation index ranged from 0.027 to 0.942 across the 34 varieties,with LW31 exhibiting the highest value and LW29 the lowest.Cluster analysis categorized all varietiesinto three groups.Varieties LW4,LW9,LW11,LW31,LW42,LW20-2,and LW21-1 were classified as drought-tolerant,and hold promise as breeding materials for new drought-resistant P.alopecuroides varieties.
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