关键词: 杂交稻, 品质, 中亲优势, 超亲优势

Abstract: Genetic analysis of the mid-parent heterosis and heterobeltiosis in rice quality was carried out by using the hybrid rice and their parents as the research objects. The results showed that the mid-parent heterosis and heterobeltiosis of brown rice and milled rice rate of hybrid rice were positive, the mid-parent heterosis and heterobeltiosis of head rice rate of hybrid rice were negative. The average 1 000-grains weight of hybrid rice was 26.48 g and ranged between the male sterile line and the restore line. The mid-parent heterosis of 1 000-grains weight of hybrid rice was positive and the heterobeltiosis of hybrid rice was negative. The average seed length, seed width and length-width ratio of hybrid rice was 6.59 mm, 2.24 mm and 2.98 mm respectively. The mid-parent heterosis and heterobeltiosis of seed length, seed width and length-width ratio of hybrid rice were positive. The average chalky grain rate and chalkiness degree of hybrid rice was 7.5% and 17.86%. The mid-parent heterosis and heterobeltiosis of chalky grain rate and chalkiness degree of hybrid rice were negative. The average amylose content of hybrid rice was 16.98% and ranged between the male sterile line and restore line. The mid-parent heterosis of amylose content of hybrid rice was positive and the heterobeltiosis of amylose content of hybrid rice was negative. The average gel consistency of hybrid rice was 36.28 mm, the mid-parent heterosis and heterobeltiosis of gel consistency of hybrid rice were negative. Therefore, the ideal hybrid rice combinations with high grain quality can be selected according to the genetic association between the parents and hybrid rice .

Key words: hybrid rice, quality, mid-parent heterosis, heterobeltiosis