DOI: 10.36347/sjavs.2014.v01i04.027

Pages: 293-298

Six generations, including P1，P2，F1，B1，B2 and F2, were constructed by 90-21-23 (tolerance to K deficiency) and D937 (sensitive to K deficiency) in maize (Zea Mays L.). The genetic analysis of plant potassium Accumulation were evaluated under natural potassium deficiency experimental field using a mixed genetic model of major gene plus polygene. The results showed that the plant potassium Accumulation were controlled by two major genes with additive-dominance-epistatic effects plus polygenes (E_1_0 model). The heritability of the major gene plus polygene in B1, B2 and F2 was estimated to be 57.99%, 58.94% and 52.99% respectively, and thus environment variance accounted for 41.06%~47.01% of phenotype variance. These results indicated that the most efficient selection tolerance to potassium deficiency was in the B2 generation. The polygenes and the environmental effect also play an important role in phenotypic variation. These results indicated that advanced backcross or recurrent selection should transfer the potassium tolerance gene and selection should not perform in early generation. This study recommends that the segregation analysis can be used by maize breeder who have related segregation data to obtain important information on the inheritance of tolerance breeding material, and could be benefit breeder to improve breeding program in maize.