Abstract
Rice blast is a serious disease caused by the filamentous ascomycetous fungus Magnaporthe oryzae. Incorporating disease resistance genes in rice varieties and characterizing the distribution of M. oryzae isolates form the foundation for enhancing rice blast resistance. In this study, the blast resistance gene Pish was observed to be differentially distributed in the genomes of rice sub-species. Specifically, Pish was present in 80.5% of Geng varieties, but in only 2.3% of Xian varieties. Moreover, Pish conferred resistance against only 23.5% of the M. oryzae isolates from the Geng-planting regions, but against up to 63.2% of the isolates from the Xian-planting regions. Thus, Pish may be an elite resistance gene for improving rice blast resistance in Xian varieties. Therefore, near-isogenic lines (NILs) with Pish and the polygene pyramid lines (PPLs) PPLPish/Pi1, PPLPish/Pi54, and PPLPish/Pi33 in the Xian background Yangdao 6 were generated using a molecular marker-assisted selection method. The results suggested that (1) Pish significantly improved rice blast resistance in Xian varieties, which exhibited considerably improved seedling and panicle blast resistance after Pish was introduced; (2) PPLs with Pish were more effective than the NILs with Pish regarding seedling and panicle blast resistance; (3) the PPL seedling and panicle blast resistance was improved by the complementary and overlapping effects of different resistance genes; and (4) the stability of NIL and PPL resistance varied under different environmental conditions, with only PPLPish/Pi54 exhibiting highly stable resistance in three natural disease nurseries (Jianyang, Jinggangshan, and Huangshan). This study provides new blast resistance germplasm resources and describes a novel molecular strategy for enhancing rice blast resistance.
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31 May 2019
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Funding
This study was supported by the National Key R & D Program of China [grant numbers 2017YFD0100304 and 2017YFD0100402], the Project of Breeding of Key New Varieties in Jiangsu Province [grant number PZCZ201702], the Jiangsu Province 333 Project [grant number BRA2016145], the Natural Science Foundation of Jiangsu Province, China [grant number BK20160447], the Molecular Breeding Technology Construction of Public Service Platform, Yangzhou City [grant number YZ2017170], and the Rice Industry Technology System of Yangzhou Comprehensive Experimental Station, Yangzhou, Jiangsu Province, China (CARS-01-60).
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Xiao, N., Wu, Y., Wang, Z. et al. Improvement of seedling and panicle blast resistance in Xian rice varieties following Pish introgression. Mol Breeding 38, 142 (2018). https://doi.org/10.1007/s11032-018-0899-6
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DOI: https://doi.org/10.1007/s11032-018-0899-6