早熟玉米自交系萌发期和苗期抗旱性鉴定与综合评价OA

In order to to investigate the drought resistance of different early-maturing maize inbred lines at both germination and seedling stages,and to establish a'germination-seedling'two-stage drought resistance evaluation technology system,47 early-maturing maize inbred lines were used as experimental materials,to identify excellent inbred lines with drought resistance at both germination and seedling stages.The results showed that,-0.30 MPa(PEG-6000)treatment was identified as the optimal osmotic pressure concentration for evaluating drought resist-ance in maize inbred lines at the germination stage.By measuring the seed germination drought tolerance index un-der this osmotic stress,23 inbred lines with resistant and highly resistant levels were selected.The survival rate af-ter recurrent drought survival rate was measured at the seedling stage,leading to the selection of 29 inbred lines with resistant and highly drought resistant.Based on the comprehensive evaluation,20 inbred lines demonstrated re-sistant and highly resistant at both germination and seedling stages,including four lines with highly drought resist-ant:206-305,NY624,207Y-4,and H19-9.Drought resistance levels of six inbred lines showed susceptible and highly susceptible,among which,one line of H05-100 was classified as highly susceptible.