Abstract:

Rice kernel smut（RKS）mainly damages rice floral organs in rice male sterile lines,and it occurs in most hybrid rice growing regions of the world,which becomes one of the main diseases to limit the seed production of hybrid rice. Studying the interaction mechanism between pathogenic bacteria and host may provide an important basis for mining gene resources of T. horrida and molecular breeding of rice with disease resistance. This review summarized the recent advances in infection processes,pathogenic related genes and biological pathways,and rice’s responses to T. horrida infection,as well as put forward future key research directions. The current studies demonstrated that the pathogen T. horrida invading the rice stigma at the earlier booting stage resulted in the disease. The lipid degradation and autophagy processes were key pathways of T. horrida successfully infecting the hosts. Genome sequencing and prediction of candidate effector proteins laid a foundation for the pathogenic genes researches of T. horrida. Furthermore,the report of sterile line resources resistant to T. horrida provided important resistant materials for gene mining and mechanism analysis. Future researches may focus on elucidating the pathogenic mechanism of T. horrida,mining the potential RKS-resistant genes using the resistance resources,and applying it in molecular breeding of resistance.

Key words: rice, Tilletia horrida, interaction, pathogenic genes, resistance genes