4个抗稻瘟病基因在籼稻资源中的分布.

[Objective]This paper aimed to determine the distribution of rice blast resistant gene Pi-ta, Pi-9, Pi-b, and Pi-zt in rice materials in Hanzhong region and their effectiveness of combination of resistance to disease. [Methods] The molecular markers of four disease-resistant genes were used to detect the resistance of rice materials in Hanzhong region. [Results] The resistance gene pi-zt distribution frequency was the highest, followed by the resistance gene Pi-b and Pi-9, and Pi-ta was the lowest frequency. With different combinations of blast resistance genes showed the different levels of resistance to blast, Pi-b and Pi-9 contribution to the region of the blast resistance was larger, at the same time, containing Pi-b, Pi-9 and Pi-zt genes could effectively enhance the level of resistance. [Conclusion]The resistance gene database was preliminarily established to provide a scientific basis for the breeding of the gene molecule. [ABSTRACT FROM AUTHOR]