Genetic analysis of tolerance to low phosphorus using major gene plus poly-gene model in Yunnan japonica rice

Genetic breeding of high-phosphorous in crop is an efficient way to utilize potential phosphorous in soil. Genetic analysis of tolerance to low phosphorus of using major gene plus poly-gene model in Yunnan japonica rice were identified for existence and number of major gene, which can speed up rice breeding of high-phosphorous . In the low-P tolerance experiment, P1,P2, F1, F2 and F3 5 populations hybrided from parents(Hexi35 and Zaohangu)were planted under low phosphorous of soil (6.26 mg·kg-1) and high level (40 mg·kg-1) in Yunnan Academy of Agricultural Sciences, and its low-P tolerance genetic were analyzed about gene effect using major gene plus poly-gene mixed model. The main results are as follows: the genes of low-P tolerance of tiller and grain yield per panicle was controlled by two major gene and poly-gene,there were epistasis effects and obvious differences in genetic effects between the two major genes.F2 heritability of major gene of tiller was from 80.64% to 85.55%,and F3 heritability from 45.88% to 57.96%;F2 heritability of major gene of grain yield per panicle was from 60.94% to 83.08 %,and F3 heritability from 62.20% to 75.80%. So, It is suggested that utilizing major gene and additive effects of the first major gene during which, traits of tolerance to low-P should be screened from F2 segregating generation and upper generation, played an important role in rice breeding.