Abstract:
Objective Agronomic characteristics and nutritional quality of colored rice grains from the mutated plants germinated from the irradiated seeds were analyzed.
Method Dried rice seeds of Yangdao 6 (9311-CK) were irradiated by Co60 to self-cross breed stable mutants that bore grain hulls with reddish brown or black color. Agronomic traits and nutritional quality of the harvested grains were determined.
Result R9311-01 of black grains and R9311-02 of reddish brown grains were obtained through the radiation treatment and select breeding. The mean ear length of R9311-01 and the 1000-grain weight of R9311-02 differed significantly from those of 9311-CK, but not the other agronomic traits. Aside from crude protein and total amino acid, the contents of fat, amylopectin, flavonoids, and anthocyanins in the grains of the mutant strains were significantly higher than those of control. Except the significantly higher lysine content in the grains of R9311-01, all other amino acids in the rice of either strain deviated significantly from control.
Conclusion The grains of black R9311-01 and reddish brown R9311-02 mutant rice obtained by irradiation inherited most of the agronomic traits of the grains of their parents 9311-CK but showed an improved nutrient content. Consequently, the radiation treatment might provide a venue for breeding high quality rice varieties bearing colored grains.
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