| The drought is the impact of corn production to enhance the first limiting factor.Increasing irrigation facilities,improving the environment and enhancing the ability of plants to adapt to drought are the main ways to improve the drought resistance of crops.Understanding drought resistance characteristics and screening drought resistant varieties are effective means to solve drought problems.In this study,7 representative locations were determined in three major maize producing areas in china,and maize hybrids with good drought resistance were selected to carry out an experimental investigation with 2 water treatments(drought,irrigation)in 2014-2016 years.The drought resistance related agronomic characters,dry matter accumulation and yield were investigated to evaluate the drought resistance characteristics of different maize varieties by analysis drought resistance index,drought tolerance index and stress sensitive index.Give the result as follows:1? Drought reduced the rate of seeding,plant height uniformity,SPAD value,dry matter accumulation.Shaandan 609 and Denghai 605 who have better drought resistance ability,have higher seeding rate and dry matter accumulationr.The ratio of dry matter accumulation to total accumulation was higher.ASI and plant height uniformity was smaller.SPAD value was stable.2? Genotype effect,treatment effect,location effect,genotype by treatment interaction effect,genotype by location effect and genotype by location by treatment effect accounted for the total variation by 3.77%?20.08%?43.19%?0.81%?11.60%?3.85%,respectively.Treatment effect,location effect,genotype by treatment interaction effect,genotype by location effect and genotype by location by treatment effect were 5.35?11.46?0.21?3.08?1.05 times of genotype effect,respectively.The results showed that different maize varieties varied greatly in different locations and years.3? To analyze the yield,the coefficient of variation and GGE biplot in the 3 year trial,Zhongzhong 8,Xianyu 335,Weike 702,Zhengdan 958,Shaandan 609,Jindan 81 have higher production level,smaller coefficient of variation and better stability than others.Belong to high yield and stable varieties.4? The drought resistance of varieties in three years was evaluated by use drought resistanceindex,drought tolerance index and GGE double labeled map analysis.The results show that Jindan 81,Xianyu 335,Zhongzhong 8,Zhengdan 958,Weike 702,Shaandan 609 and Denghai 605 have higher drought resistance index,drought tolerance index and stability than others.Belong to highly drought resistant varieties.5? Yulin Academy of Agricultural Sciences demonstration results show that Shandan 609 have high yield,high emergence rate,short ASI.Consolidated results show that Shandan609 have high drought resistant.6? The drought resistance of the seven maize varieties participating in the 3 years experiment were analyzed by direct identification and indirect identification.Yield and agronomic traits were better performance of the maize varieties are the Xianyu 335 and Shandan 609. |
PDF Full Text Request