A population of 123 double haploid (DH) lines, derived from a cross between an indica variety IR64 and japonica variety Azucena was used in this study.

• 以籼稻品种IR64和粳稻品种Azucena及其DH群体(123个DH系)为遗传研究材料,在穗干物质积累的不同时期测定穗重。