Genetic Analysis Of Grain Quality In Braley

Barley is mainly used as the materials for beer, feed production for Animal Husbandry and major food crops for plateaus residents, and its quality is of important for the commercial values of the final product, thus the improvement of barley quality has been placed into a major objective of barley breeding and agronomy studies. In the current study, the inheritance of the pasting properties and the major genes plus polygenes mixed inheritance model of the pasting properties, amylose content, amylopectin content, the ratio of amylopectin content and amylose content, the starch content and the protein content of barley were investigated by a72diallel desin and a Doubled Haploid population. The results are showed below.(1)In addition to pasting temperature to more combinations of ultra-low parental, other starch pasting properties are mostly between the combination of parents of hybrid F1.The combinations of ultra-low parental of Peak Viscosity,Trough Viscosity, Final Viscosity and.Peak Time are the least, while the combinations of ultra-high parental of Breakdown Viscosity, Setback Viscosity and Pasting Temperature are the least.(2) For Breakdown Viscosity of Barley hybrid and mid-parental show significant positive correlation, for Setback Viscosity of hybrid and female parent, high-parental, mid-parental show significant or very significant positive correlation, and for Pasting Temperature of hybrid and male parent show significant positive correlation; in general, the correlation between hybrid with female parent, male parent, low-parental, mid-parental and high-parental are positive in pasting properties.(3) Significance or very significance is found in the variability among the parents, among the hybrid combination and among the reciprocal crosses in the Pasting Properties of barley, which means that the additive variation, dominant variation and cytoplasm effects of barley pasting properties are existed. There is no significant variability among the parents and the hybrid combination in the Pasting Properties of barley, which implicates that genetic equilibrium is existed. The variation among Through Viscosity, Final Viscosity, Setback Viscosity and Pasting Temperature within hybrids is significantly larger than that within parents, which means that these traits are mainly controlled by the endosperm genotype. The variation among Peak Viscosity, Breakdown Viscosity and Peak Time is equivalent to that within parents, which means that these traits are controlled by the maternal plant genotype.(4)The broad heritability of the pasting properties in barley is over50%except the Peak Viscosity, and the broad heritability of the Setback Viscosity is reach to87%, which means the genetic factor play an important role in pasting properties in barley. The narrow heritability of the pasting properties are small except Setback Viscosity (72%), and the narrow heritability of the Peak Viscosity and the Through Viscosity are30%. The additive inheritance coefficient of variation of the pasting properties in barley is over10%, which means that the descendant lines have major genetic variance and could be well used in barley breeding.(5) The analysis on the major genes plus polygenes mixed inheritance model indicated that the Breakdown Viscosity and Peak Time are controlled by polygenes or two major genes plus polygenes. The Peak Viscosity, the Through Viscosity, the Final Viscosity and the Protein Content in Barley are controlled by two major genes or two major genes plus polygenes.The Setback Viscosity and Pasting Temperature are controlled by two major genes plus polygenes or three major genes. The Amylopectin/Amylose is controlled by two or three major genes.The Amylopectin Content and Starch Content are controlled by three major genes or three major genes plus polygenes.