The Molecular Breeding of Different Ecotype <i>Japonica</i> Varieties Resistant to Rice Blast with High Genome Collinearity
2025
Shengyuan Zeng | Cancan Du | Yihao Yang | Qingfeng Hu | Chuang Li | Fang Feng | Min Guo | Dedao Jing | Tianzi Lin | Hongbing Gong | Changjie Yan
The Yangtze River Delta (YRD) is one of the most important <i>japonica</i> rice planting areas in China. Balancing the resistance, yield, and quality has always been a core issue in rice breeding due to the negative correlation among these three factors, while the broad-spectrum blast resistance gene <i>Piz</i> is closely linked with <i>Hd1</i>, the major gene regulating days to heading (DTH), and a precise combination of their beneficial alleles plays a key role in synchronously improving blast resistance and the regional adaptability of <i>japonica</i> rice in YRD. In this study, using the backcross progeny population derived from backbone parent ZD9471 and W1063, two alleles of <i>Hd1</i> were identified. Then, through molecular marker-assisted selection combined with Green Super Rice 40K (GSR40K) chip-based screening, six introgression lines (ILs) with two different alleles combinations of <i>Hd1</i> and <i>Pigm</i> were obtained. An evaluation of the blast resistance, yield, and quality traits showed that compared with the recipient parent, the panicle blast resistance of ILs was significantly enhanced; the grain number per panicle increased consistently with the delaying of the growth period, leading to higher yield in the ILs; the grain quality were synchronously improved. Two representative lines with similar genetic backgrounds but a significantly different regional adaptability, exhibiting a good blast resistance, high yield, and prominent quality were approved and demonstrated promising application prospects.
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