Pyramiding of Pi46 and Pita to improve blast resistance and to evaluate the resistance effect of the two R genes

doi:10.1016/S2095-3119(16)61415-6

摘要/Abstract

Abstract: Utilization of R (resistance) genes to develop resistant cultivars is an effective strategy to combat against rice blast disease. In this study, R genes Pi46 and Pita in a resistant accession H4 were introgressed into an elite restorer line Hang-Hui-179 (HH179) using the marker-assisted backcross breeding (MABB) procedure. As a result, three improved lines (e.g., R1791 carrying Pi46 alone, R1792 carrying Pita alone and R1793 carrying both Pi46 and Pita) were developed. The three improved lines had significant genetic similarities with the recurrent parent HH179. Thus, they and HH179 could be recognized as near isogenic lines (NILs). The resistance spectrum of the three improved lines, which was tested at seedling stage, reached 91.1, 64.7 and 97.1%, respectively. This was markedly broader than that of HH179 (23.5%). Interestingly, R1793 showed resistance to panicle blast but neither R1791 nor R1792 exhibited resistance at two natural blast nurseries. The results implied that the stacking of Pi46 and Pita resulted in enhanced resistance, which was unachievable by either R gene alone. Further comparison indicated that the three improved lines were similar to HH179 in multiple agronomic traits; including plant height, tillers per plant, panicle length, spikelet fertility, and 1 000-grain weight. Thus, the three improved lines with different R genes can be used as new sources of resistance for developing variety. There is a complementary effect between the two R genes Pi46 and Pita.

Key words: rice blast , resistance gene , improvement , marker-assisted selection

XIAO Wu-ming, LUO Li-xin, WANG Hui, GUO Tao, LIU Yong-zhu, ZHOU Ji-yong, ZHU Xiao-yuan, YANG Qi-yun, CHEN Zhi-qiang. [J]. Journal of Integrative Agriculture, 2016, 15(10): 2290-2298.

XIAO Wu-ming, LUO Li-xin, WANG Hui, GUO Tao, LIU Yong-zhu, ZHOU Ji-yong, ZHU Xiao-yuan, YANG Qi-yun, CHEN Zhi-qiang. Pyramiding of Pi46 and Pita to improve blast resistance and to evaluate the resistance effect of the two R genes[J]. Journal of Integrative Agriculture, 2016, 15(10): 2290-2298.

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