Haipeng Wang , Gen Wang , Rui Qin , Chengqin Gong , Dan Zhou , Deke Li , Binjiu Luo , Jinghua Jin , Qiming Deng , Shiquan Wang , Jun Zhu , Ting Zou , Shuangcheng Li , Yueyang Liang, Ping Li
Current Issues in Molecular biology. 2024 Sep 25;46(10):10762-10778.(IF=2.8)
https://pubmed.ncbi.nlm.nih.gov/39451519/
Abstract
The utilization of heavy-panicle hybrid rice exemplifies the successful integration of architectural enhancement and heterosis, which has been widely adopted in the southwest rice-producing area of China. Iterative improvement in disease resistance and grain quality of heavy-panicle hybrid rice varieties is crucial to promote their sustainable utilization. Here, we performed a molecular design breeding strategy to introgress beneficial alleles of broad-spectrum disease resistance and grain quality into a heavy-panicle hybrid backbone restorer line Shuhui 600 (R600). We successfully developed introgression lines through marker-assisted selection to pyramid major genes (Wxb + ALKA-GC + Pigm + Xa23) derived from three parents (Huanghuazhan, I135, I488), which significantly enhance grain quality and confer resistance to rice blast and bacterial blight (BB). The improved parental R600 line (iR600) exhibited superior grain quality and elevated disease resistance while maintaining the heavy-panicle architecture and high-yield capacity of R600. Moreover, the iR600 was crossed with male sterility line 608A to obtain a new heavy-panicle hybrid rice variety with excellent eating and cooking quality (ECQ) and high yield potential. This study presents an effective breeding strategy for rice breeders to expedite the improvement of grain quality and disease resistance in heavy-panicle hybrid rice.
Keywords: blast and bacterial blight resistance; grain quality; heavy panicle; iR600.