Effects Of Ethrel Ripening On Yield And Quality Of High Quality Upland Cotton

Cotton is one of the important economic crops in China.As the largest high-quality cotton producing area in China,Xinjiang is becoming more and more important in cotton production.Xinjiang is rich in cotton variety resources.However,there are some problems such as noncentralized boll opening and non-centralized harvesting,which in turn lead to high impurity content in seed cotton,thus affecting yield and quality,and increasing harvest cost.In order to improve the collection efficiency,reduce the pollution of cotton fiber by leaves,promote the concentration of boll opening and reduce the cost,cotton chemical ripening is one of the important ways to solve the above problems.In this study,the genetic model of genotype × environment interaction was used to analyze the genetic analysis and correlation analysis of 4 yield traits and 5 fiber quality traits of 242high-quality upland cotton varieties(lines)planted in the Alar reclamation area of southern Xinjiang in the two environments of spraying ethephon(E1)and non-spraying ethephon(E2).The genetic effects were clustered to clarify the sensitivity of yield traits and quality traits of various varieties(lines)to ethephon,and provide valuable germplasm resources for the later cultivation of high-yield and high-quality cotton varieties(lines).The main results are as follows:1、The results of genetic analysis showed that the inheritance of boll number per plant and lint yield per plant was dominated by genotype × environment interaction,and the genotype ×environment interaction accounted for 65 % and 60 % of the phenotype,respectively.The inheritance of boll weight and lint percentage was dominated by errors,accounting for 55 % and85 % of the phenotypic errors,respectively.Fiber length,micronaire,specific strength and elongation were dominated by genotype,and the genotype accounted for 63 %,44 %,67 % and 53 %of the phenotype,respectively.The inheritance of uniformity was dominated by error,and the error accounted for 50 % of the phenotype.2、The results of genetic effect analysis showed that there were differences in yield and fiber quality traits among different genotype materials under the environment of spraying ethephon(E1).Without spraying ethephon(E2),the yield and fiber quality traits of different genotype materials were different,which may be affected by genotype and other factors.The yield and fiber quality traits of the same genotype materials were different under the two environments of spraying ethephon(E1)and non-spraying ethephon(E2),which were mainly affected by the genotype ×environment interaction effect.3、From the results of correlation analysis,there are different correlations between yield traits and fiber quality traits.There was a significant genotype × environment interaction positive correlation between boll number per plant and boll weight,lint yield per plant.Fiber length and uniformity had extremely significant positive genotype and genotype × environment interaction with breaking strength and elongation,respectively.Micronaire had significant or extremely significant negative genotype and genotype × environment interaction with fiber length and strength.There was a significant positive genotype × environment interaction between boll number per plant and length and uniformity.Boll weight and uniformity were significantly positively correlated with genotype and genotype × environment interaction.Lint percentage was significantly negatively correlated with fiber length and breaking strength and genotype-environment interaction.It was significantly positively correlated with micronaire and genotype-environment interaction.Boll weight and lint percentage were significantly correlated with cotton fiber quality.4、Cluster analysis showed that 23 materials(G22,G37,G43,G61,G65,G78,G79,G85,G86,G89,G90,G111,G126,G134,G135,G138,G162,G164,G166,G214,G222,G231,G239)had no significant change in yield and fiber quality traits after spraying(E1)ethephon compared with no spraying ethephon(E2).The yield traits and fiber quality traits of four materials(G34,G75,G113,G125)after spraying ethephon(E1)were better than those without spraying ethephon(E2).