新老水稻品种植株干物质积累变化的比较分析

以吉林省8个具有代表性的新老粳稻品种为供试材料，对其单株质量、叶片质量、茎鞘质量和穗质量进行测量，分析不同生育时期单株各器官干物质的积累与产量的关系。研究结果表明:新老水稻品种的单株质量、叶片质量和茎鞘质量这3个指标的变化规律不同，在整个生育期内，叶片质量与产量一直保持显著正相关，在分蘖期和乳熟期达到极显著正相关。茎鞘质量与产量相关性波动较大，在拔节期茎鞘质量与产量达显著负相关，在抽穗期达极显著正相关，剩余生育期内则表现为显著正相关，穗质量与产量的相关性在整个生育期内几乎都为极显著正相关，是产量增加的反应。 

Comparative Analysis of Dry Matter Accumulation Changes between Old and New Rice Cultivarst

Four older(released in 1960s) and four newer(released since 1990) rice cultivars were planted in field.Biomass of single plant,leaf,stem and sheath and panicle were measured.Relationship between dry matter accumulation and yield was studied in each growing stage.Results showed that biomass of single plant,leaf,stem and sheath and panicle of older and newer cultivars changed in different ways.In the whole growing stage,biomass of leaf was achieved positive correlation with the yield,especially achieved significant positively correlation level at the tillering stage and milky stage.Relevance between biomass of stem and sheath and yield had wider fluctuation.Biomass of stem and sheath were significantly negatively correlated with yield in the shooting period,and in the heading stage achieved significant positively correlation level,in the rest stages was positively correlation.Biomass of panicle kept significant positively correlation with yield in all the growing stage,which showed the yield growth.