Breeding method for bilinear ultra-small embryo hybrid rice

Abstract

The invention discloses a breeding method for bilinear ultra-small embryo hybrid rice and belongs to the technical field of special rice seedling. Bilinear sterile line and restoring line immature embryos to be mutagenized are subjected to in vitro tissue culture induction to form callus, 60 Co-gamma rays with the dosage being 11 to 15Gy are utilized for irradiation treatment, ultra-small embryo property mutants are obtained, then, the ultra-small embryo bilinear sterile line and restoring line are breaded through selecting properties of agriculture, yield, flowering and the like, and further, the bilinear ultra-small embryo hybrid rice combination is formed through matching. The content of the embryo is reduced through the breeding method, and the endosperm specific gravity improvement is reached, so the goals of improving the grain thousand seed weight, the yield and the polished rice rate are reached. The breeding method provided by the invention has the advantages that the ultra-small embryo property mutation frequency reaches 0.01 to 0.02 percent, the embryo weight of the breaded bilinear ultra-small embryo hybrid rice only accounts for 1 to 1.2 percent of the coarse rice grain weight, the size is only 1 / 3 to 1 / 2 of that of the ordinary rice embryo, and the polished rice rate is improved by 1.5 to 2.5 percent through being compared with that of the ordinary rice.

Description

technical field

[0001] The invention specifically relates to a method for breeding two-line ultra-small embryo hybrid rice, and belongs to the technical field of special rice breeding. Background technique

[0002] The brown rice of rice is mainly composed of endosperm and embryo. The main component of endosperm is starch, and the embryo contains more nutrients such as protein, fat and amino acid. Therefore, some breeders increase the nutrient content of brown rice by increasing the size of the embryo, such as giant embryo rice. However, to eat the nutrients in the germ, you must eat brown rice, because the germ and seed coat have been removed (remaining in the bran) during the process of milling brown rice into polished rice, and the polished rice we eat does not contain germ. Brown rice is difficult to boil because of poor taste, and people do not like to eat it. The polished rice we eat is removed during the rice milling process, because the husk, seed coat and embryo a...