RICE SCIENCE ›› 2009, Vol. 16 ›› Issue (3): 201-209 .DOI: 10.1016/S1672-6308(08)60080-3

• Research Paper • Previous Articles     Next Articles

Effect of Cold-Water Irrigation on Grain Quality Traits in japonica Rice Varieties from Yunnan Province, China

ZHAO Guo-zhen1, LIU Ji-xin1, YANG Sea-jun2, YEA Jong-doo2, LIAO Xin-hua1, SU Zhen-xi1, SHI Rong1, JIANG Cong1, DAI Lu-yuan1   

  1. 1 Japonica Rice Breeding Center, Yunnan Academy of Agricultural Sciences, Kunming 650205, China; 2 National Institute of Crop Science, Rural Development Administration, Suwon 441-857, Korea
  • Received:2009-01-09 Online:2009-09-28 Published:2009-09-28
  • Contact: DAI Lu-yuan
  • Supported by:
    project 2006 NG 04 of Yunnan Province, China, and the International corporation project between the Yunnan Academy of Agricultural Sciences of China and the National Institute of Crop Science, Rural Development Administration of Korea.

Abstract: The response of grain quality traits to cold-water irrigation and its correlation with cold tolerance were studied in 11 japonica rice varieties from Yunnan Province, China. The results indicated that the response of grain quality traits to the cold-water stress varied with rice varieties and grain quality traits. Under the cold-water stress, grain width, chalky rice rate, whiteness, 1000-grain weight, brown rice rate, taste meter value, peak viscosity, trough viscosity, breakdown viscosity and final viscosity significantly decreased, whereas grain length-width ratio, head rice rate, alkali digestion value, protein content and setback viscosity markedly increased. However, the other traits such as grain length, amylose content, milled rice rate, peak viscosity time and pasting temperature were not significantly affected by the cold-water stress. Significant correlations were discovered between phenotypic acceptability and cold response indices of taste meter value, protein content, peak viscosity and breakdown viscosity. Therefore, it would be very important to improve the cold tolerance of Yunnan rice varieties in order to stabilize and improve their eating quality.

Key words: japonica rice, cold-water irrigation, grain quality trait, cold tolerance, starch viscosity