Study on the allelism of boron efficiency genes in Brassica napus

'Qingyou No.10' and `8Z05' had been proved to be boronefficiency cultivars, 'Bakow' be a boroninefficiency cultivar by pot culture experiment. The F2 population of `8Z05''Qingyou No.10' were planted in boron deficient soil from 2000 to 2001. At the flowering stage, the ratio of boron efficiency plants to boron inefficiency plants was 574∶14. The ratio at bearing stage was similar to the result of the flowering stage, which showed that major genes controlling boron efficiency traits in the two boron efficiency cultivars were allelic. Another minor genes probably had some contributions to the traits of boron efficiency, but the location of them may be different. The results obtained from 2001 to 2002 showed the same rule.