The Yield-Related Trait And Fiber Quality’s Assessment And Correlation Analysis Of Chromosome Segment Substitution Lines From G. Bardadense

The performance of the fiber quality and the resistance to verticillium of G. bardadense cultivars issuperior to G. hirsutum. It is important to introgress excellent genes from G. bardadense to high-yield G.hirsutum cultivars for cotton genetic improvement.In this research, a cotton germplasm population withgenetic background of G.hirsutum and some chromosome segments of G. barbadense were developedthrough crossing and advanced backcrossing with CCRI221, a commercial cotton cultivar as, therecipient parent,, and Hai1as the donor parent. Plenty of lines and individuals superior to the recipientparent CCRI221, especially in fiber quality were acquired through evaluating yield-related trait andfiber quality in BC₄F₃and BC₄F_3:4。1.The transgressive rate over the recurrent parent in BC₄F₃and BC₄F_3:4lines was above40%forfiber length,strength,micronaire value and elongation.There were large number of high fiber qualityindividuals, fiber strength was above32cN/tex for78individuals in BC4F4lines, and the highest fiberstrength reached to34.30cN/tex.This will provide a number of germplasm resources for furtherdeveloping single segment substitution lines, accurately locating QTL, cloning genes and genespyramiding.2. The SAS9.1be used to analysis the relation between two generations production traits and fiberquality traits, yield traits and fiber quality traits. The results show that the boll number is an importantfactor to improve cotton production,and fiber quality traits has Stronger correlation, the Correlationbetween Boll weight and fiber quality traits is more obvious, followed by lint percentage, the worst forboll number, we can give priority to the selection of these indicators in the cotton breeding process.3. The SAS9.1be used to analysis the relation between two generations Verticillium wilt and yieldtraits and fiber quality traits. The results show that there has greater effect between Verticillium wiltwith yield traits then Verticillium wilt with fiber quality traits.We can control cotton verticillium wilt Bychanging farming practices, balanced fertilization and destruction of sick straw measures et,but the mosteffective measure is the promotion of the resistant varieties.4. Inorder to more clear the principal components factor between cotton production and cottonfiber quality, The SAS9.1be used to analysis the principal components factor between two generationsproduction traits and fiber quality traits, yield traits and fiber quality traits. The results show that thecumulative contribution rate of seven principal components factor is more than95%in the twogenerations,the first principal components factor is yield factor,and the cumulative contribution rate ofyield factor beyond30%,Genetic correlation between the two generations of yield and quality traitsreflected by single boll weight and length of the cotton fiber.The genetic correlation of Yield traits,quality traits and yield and quality trait played a significant role in the breeding.5. Cotton yield and fiber quality traits exist more or less interrelated, Or mutually inhibit orpromote each other.the breeding of new varieties should be based on the genetic correlation betweeneach trait, so as to achieve a higher efficiency...