272份谷子种质资源萌发期抗旱性综合评价OA

A total of 272 millet germplasms were used as research objects.PEG-6000 solution was used to sim-ulate drought stress,and 20%was determined as the optimal concentration for drought resistance identification at germination stage by pre-test.Two treatmentsof distilled water(CK)and drought stress were set up.The drought re-sistance of millet was comprehensively evaluated by drought resistance coefficient(DC)through measuring nine in-dexes such as germination potential,germination rate and germination index of millet.The results of statistical analy-sis showed that all the measured indexes showed a downward trend under drought stress.Principal component analy-sis converted 9 identification indexes into 2 principal components,and the cumulative variance contribution rate was 72.49%.Correlation analysis showed that there was extremely significant positive correlation between each index.The above analysis results showed that drought stress seriously inhibited millet germination and root and bud growth,and the different indicators of millet under drought stress were correlated and consistent.The results of comprehen-sive membership function analysis combined with principal component analysis and entropy weight TOPSIS analysis showed that Jiugu 41 had the strongest drought resistance.K-means cluster analysis divided the drought resistance of the tested materials into two groups,and the overall drought resistance of the second group was better than that of the first group.The optimal regression equation was established by stepwise regression analysis,which showed that 9 indexes could be used as the objective evaluation indexes of drought resistance identification in millet germination stage,and D value was the appropriate drought resistance evaluation method.