Three rice varieties and several F3 lines with high and low cold tolerance, selected from F3 segregation lines of two crossesMilyang 23/Tong 88-7 and Milyang 23/TR22183 were used to analyze the effects of cold tolera...Three rice varieties and several F3 lines with high and low cold tolerance, selected from F3 segregation lines of two crossesMilyang 23/Tong 88-7 and Milyang 23/TR22183 were used to analyze the effects of cold tolerance on the response of grainquality to cold water irrigation. The result showed that cold water irrigation led to the decrease of rice grain size. Thelength, length-width ratio and weight of brown rice grain were more sensitively affected by cold water irrigation than thewidth and thickness. The shape of brown rice grain was not significantly affected by the selection for cold tolerance at theseedling stage (CTS). The gel consistency, amylose content, peak viscosity, cool viscosity, breakdown viscosity andconsistency viscosity were decreased, while alkali digestibility value and protein content were increased by cold waterirrigation. Under normal irrigation condition the physicochemical properties of milled rice and viscogram components ofmilled rice flour were not significantly different between lines with high and low cold tolerance. Under cold water irrigationthe amylose content, peak viscosity, hot viscosity, final viscosity of rice lines with high CTS or high cold tolerance at thebooting stage (CTB) were higher, while the protein content, setback viscosity, breakdown ratio and setback ratio werelower, than those of rice lines with low cold tolerance. This implied that the cold water response of rice grain quality wasless sensitive in the lines with high cold tolerance than in the lines with low cold tolerance, and the varietal improvementfor cold tolerance would be important for grain quality improvement at the same time.展开更多
文摘Three rice varieties and several F3 lines with high and low cold tolerance, selected from F3 segregation lines of two crossesMilyang 23/Tong 88-7 and Milyang 23/TR22183 were used to analyze the effects of cold tolerance on the response of grainquality to cold water irrigation. The result showed that cold water irrigation led to the decrease of rice grain size. Thelength, length-width ratio and weight of brown rice grain were more sensitively affected by cold water irrigation than thewidth and thickness. The shape of brown rice grain was not significantly affected by the selection for cold tolerance at theseedling stage (CTS). The gel consistency, amylose content, peak viscosity, cool viscosity, breakdown viscosity andconsistency viscosity were decreased, while alkali digestibility value and protein content were increased by cold waterirrigation. Under normal irrigation condition the physicochemical properties of milled rice and viscogram components ofmilled rice flour were not significantly different between lines with high and low cold tolerance. Under cold water irrigationthe amylose content, peak viscosity, hot viscosity, final viscosity of rice lines with high CTS or high cold tolerance at thebooting stage (CTB) were higher, while the protein content, setback viscosity, breakdown ratio and setback ratio werelower, than those of rice lines with low cold tolerance. This implied that the cold water response of rice grain quality wasless sensitive in the lines with high cold tolerance than in the lines with low cold tolerance, and the varietal improvementfor cold tolerance would be important for grain quality improvement at the same time.
