Abstract: To understand genetics factors of barley arabinoxylan and relative substance,the phenotypingdata of traits including total arabinoxylan(TAX),water-extractable arabinoxylan(WEAX),unwater-extractable arabinoxylan(WUAX),the ratio of unwater-extracted arabinoxylan(WUAX) and water-extracted arabinoxylan(WEAX) were characterized from a DH population which derived from a cross between Steptoe and Morex.Meanwhile,a methodology named "mixed major gene plus poly-gene inheritance model" was applied to resolving the genetic model of those traits.The variance results indicated that the significant different in grain arabinoxylan trait was available among year and offspring(P <0.01),while the interaction between genotype and year also significantly controlling the grain arabinoxylan content among offspring (P <0.01),the genetics model of TAX was fitted for three completely equal major genes with additive affect inheritance model in 2012-Yangma environment but two complementary effect major gene,two complementary effect major gene and one additive affect major gene in 2013-Yangma,Nanchong and Ya'an environment,respectively.WEAX in 2012-Yangma,2013-Yangma,Nanchong and Ya'an were controlled by two equal major genes with additive affect,three completely equal major genes with additive effect,four completely equal major genes with additive affect and four major genes expressing in model of additive epistatic effect,respectively.The genetics model of WUAX/WEAX(UE) was fitted for two major genes with additive-epistatic effect inheritance model in 2012-Yangma,as four additive-epistatic major gene,two complementary effect major gene,four additive-epistatic major gene in 2013-Yangma,Nanchong and Ya'an environment.Apart from Nanchong,the genetics model of WUAX were the same as TAX in each environment. WUAX was controlled by three equal major genes with additive effect in Nanchong environment. The highly heritability of major gene controlling arabinoxylan variation in barley was identified in this research,which ranged from 0.514 to 0.994. The results indicated that inheritance of arabinoxylan showed slightly different in different year for the temporal and spatial expression of plant metabolism genes.

Key words: Barley, Arabinoxylan, Major gene plus poly-gene model, Inheritance characteristics

CLC Number: 

• S513.03