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近十余年,在世界范围内水稻育种方面尚未取得突破性的进展,重要的原因是没有发现优异的种质和缺乏新的育种途径。在现有单产水平较高的基础上,进一步提高水稻产量的关键在于利用杂种优势,尤其是籼粳亚种间杂种优势的利用。 籼粳亚种间杂文育种的障碍之一是结实率低,F_1的结实率一般不足于10％,而且,后代性状很不易稳定,在育种程序上需要采用多次回交与复交等
In the recent ten years, no breakthrough has been made in rice breeding around the world. The important reason is that no outstanding germplasm was found and new breeding methods were lacking. Based on the existing high yield level, the key to further increase the yield of rice lies in the utilization of heterosis, especially the heterosis of indica and japonica subspecies. One of the barriers to the breeding of indica / japonica subspecies is low seed setting rate, the F_1 seed setting rate is generally less than 10%, and the offspring traits are not easy to be stable. Breeding programs need to use multiple backcrosses and complex breeding