甘蔗基因型苗期生理性状与糖分及产量的关系

Studies on the Relationship Among Physiological Characters of Seedling Stage , Cane Juice Sucrose , and Cane Yield in Sugarcane Genotypes

摘要: 选取8个甘蔗基因型研究苗期一些生理性状与蔗汁糖分和产量关系。结果表明：苗期的相对生长率（RGR）与净同化率（NAR）间呈显著正相关（0．96），RGR、NAR与蔗汁糖分均呈负相关，与蔗茎产量均呈正相关。通径分析结果表明NAR对蔗汁糖分和蔗茎产量均为直接正向贡献。研究结果认为，甘蔗苗期有较高的NAR、叶面积比率（LAR）和叶绿素a/b值，可作为苗期进行高产高糖性状间接选择的指标。

Abstract: The physiological characters of leaf in seedling stage of 8 sugarcane genotypes were studied. The results showed that there was a very significant positive correlation (0.96) between relative growth rate (RGR) and net assimilation rate (NAR) during seedling stage. Both RGR and NAR had a negative correlation with cane juice sucrose and positive correlation with cane yield. Path analysis indicated that the NAR had directly positive contributions to cane juice sucrose and cane yield. The results showed that these physiological characters of seedling, such as higher value of NAR, LAR and chlorophyll a/b, can be used as indirect selection indices for higher yield and higher sucrose content of cane.