Physicochemical properties of non-glutinous, dull, and glutinous rice grain in segregating populations of dull/glutinous crosses

摘要

Dull grains segregated from F_3 and F_4 of the crosses between two dull mutants and a glutinous cultivar were compared with non-glutinous and glutinous segregants for their physicochemical properties. Amylose content of dull rice grain segregated from the dull/glutinous cross showed the intermediate value between glutinous and non-glutinous rice grain, whether it is controlled by the recessive or dominant gene. Alkali digestibility value (ADV) of dull rice grain was lower than that of glutinous ornon-glutinous rice. A positive correlation was found between ADV and amylose content of homozygous non-glutinous or dull F_4 grains, but a negative relationship was observed in glutinous grains. Protein content of dull grain was significantly higher thanthat of glutinous or non-glutinous grain segregated from the same cross, while those of glutinous and non-glutinous grains were not different. Among gelatinization characteristics, initial pasting temperature and peak viscosity of dull grains were higher than glutinous rice, and were not different with non-glutinous grain. Hot, cool and consistency viscosities of dull grain were intermediate between glutinous and non-glutinous rices. Dull grains showed the highest breakdown viscosity and the lowest setback viscosity among the three endosperm types.