Work

Improving Grain Shape of the Rice Variety Exiangsimiao by Introgressing the Long-Grain Allele of GL7/GW7

Year: 2026

Type: article

Abstract: was introgressed into EXSM via marker-assisted selection combined with backcross breeding, and two improved long-grain lines (EXSM-IL1 and EXSM-IL2) were developed. Their background recovery rates reached 96.70% and 97.50%, respectively. Their grain lengths (GLs) and length-to-width ratios (LWRs) were significantly higher than EXSM. The milling quality, especially the head milled rice rate (HMRR), of both improved lines was significantly lower than EXSM. EXSM-IL1 showed no significant difference in grain yield (GY) to EXSM, although both improved lines had shorter total growth duration (TGD), longer panicle length (PL), and a lower seed setting ratio (SSR) and 1000-grain weight (KGW). Six hybrid combinations derived from the improved lines exhibited longer GL, higher LWR and narrower GW than those of the hybrid combinations derived from EXSM. The TGD and KGW of the six hybrid combinations were significantly lower compared with the hybrids from EXSM. Furthermore, the two improved lines carried 41 favorable genes associated with crucial traits. These results provide the basis for rice grain shape improvement and supply long-grain and high-quality breeding lines and restorer lines for rice production in southern China.

Source: International Journal of Molecular Sciences

DOI: 10.3390/ijms27198930