HomeInternational Rice Research Notesvol. 22 no. 3 (1997)

Xingxiangyou 77, a Highyielding and Fine-Quality Semiaromatic Hybrid Rice

Zhou Kunlu | Liao Fuming

Discipline: Agriculture, Genetics



Xingxiangyou 77 was developed at HHRRC using aromatic cytoplasmic male sterile line Xingxiang A and nonaromatic restorer line Minghui 77. It was extensively tested and approved for release to farmers by the Hunan Provincial Crop Variety Release Committee in February 1997. Xingxiang A, improved from the first aromatic CMS line Xiangxiang 2A, is another aromatic CMS line developed by HHRRC. The new line has stable male sterility and better outcrossing characteristics than Xiangxiang 2A. Minghui 77, developed by the Sanming Agricultural Institute, Fujian, China, is a popular strong restorer line with good grain quality. The cross between these two parents was first made in 1993. In 1994, the hybrid was tested in the Hunan Rice Variety Multilocational Trial and yielded 6.9 t ha-1 on average at all five locations, 5.5% higher (significant at 5% level) than check Weiyou 64. In the same year, it gave a mean yield of 5.9 t ha-1 at six locations in the trial of new commercial fine-quality rice varieties of Hunan Province with a yield advantage of 2.9% over check Xiangwanxian 1. Tested in the Hunan Rice Variety Regional Trials of 1995 and 1996, it gave a mean grain yield of 6.8 t ha-1 over 14 and 12 locations, respectively, with yields of 2.3% and 5.6% higher than those of check Weiyou 64 (Table 1). In the on-farm trials and demonstration plots, it generally yielded 6.8 to 7.7 t ha-1 when grown as late rice in a double-cropping system.