西北地区玉米亲本制种种子综合活力的评价OA北大核心CSTPCD

In order to explore the seed vigor and adaptability range of maize parents in Northwest China,41 maize hybrid parental materials were treated with accelerated aging,cold soaking,drought and salt stress.The 7 d germination rate and seedling biomass were measured,and the standard germination test without any treatment was taken as control.The correlation analysis of 29 parameters including seedling emergence rate,above activity and the biomass index of the 41 parent materials in 4 climate regions,which were Beijing,Shihezi and Urumqi of Xinjiang,and Jiuquan of Gansu,was carried out.The results showed that:It was feasible to evaluate the vigor of parent seeds by selecting those lines with 80％seeds germinated normally under simulated drought(20％PEG 6000)and salt stress(200 mmol/L NaCl)treatments,respectively.The standard germination rate(bud rate)of 30 of the materials reached 85％of the national standard,and 11 of the materials were＞92％of the germination standard.After cold soaking treatment,the germination rate of 35 parents(about 85％)was not significantly affected compared with the that of the control group,and the germination rate of 4 parents after cold soaking was 1％to 18％higher than that of untreated parents.The aging resistance of 41 parent seeds was generally poor,and the highest germination rate was only 44％after accelerated aging.Under 200 mmol/L NaCl stress,the germination rate of 10 parents was significantly inhibited,and under 20％PEG 6000 drought condition,the germination rate of 8 parents was significantly inhibited.The germination rate of the other 10 parents was significantly increased under the simulated drought and salt stress(P≤0.05).The comparative analysis of seedling biomass under the above criteria of germination,cold soaking,aging,drought and salt stress did not find any specific trend or law,and the trend of seedling length and seedling weight was the same.The drought stress induced root development in 18 parents,and the root weight increased significantly in 12 parents.The seedling emergence rate of different parental materials showed great variation in the four climate zones,and the correlation between the seedling emergence rate and cold immersion germination rate in each climate zone reached a very significant level.