水稻DUS测试新品种品质性状的差异性分析及应用

在DUS测试的基础上,对23个水稻申请品种及其近似品种的8个主要稻米品质性状连续2年的检测结果进行了差异性分析,结果表明:8个稻米品质性状在品种间的差异均达到极显著水平,其变异系数大小依次为垩白度、垩白粒率、碱消值、直链淀粉含量、胶稠度、整精米率、精米率、糙米率;常规稻的整精米率、垩白粒率、垩白度和直链淀粉含量的变异系数明显高于杂交稻;DUS测试性状差异较小的4对材料均有3个以上的品质指标存在显著差异;8个稻米品质性状均符合UPOV对性状的要求,可作为水稻DUS测试指南中的补充测试性状用于DUS测试判定.

Difference Analysis and Application in DUS Testing of Grain Quality Characteristics of Rice New Varieties for DUS Testing

Based on the DUS testing experiment, the difference of eight main grain quality characteristics of 23 rice applicant varieties and their similar ones were statistically analyzed in 2 continuous years. A significant difference was found among varieties on each of the eight grain quality characteristics, and the variation coefficients of these grain quality characteristics were ranked in the order of chalky percent, chalkiness, alkali value, amylose content, gel consistency, head rice, milled rice and brown rice. The variation coefficient of head rice, chalky percent, chalkiness and amylose content of conventional rice varieties were obviously higher than those of hybrid ones. Significant differences were found on at least 3 of the eight grain quality characteristics for each of the 4 pairs of rice DUS testing varieties with difference on only 1-2 characteristics according to the DUS testing results. All the eight grain quality characteristics in this experiment met the UPOV requirements as DUS testing characteristics and could be listed as the complimentary characteristics in the rice DUS testing guideline.