甘薯不同品种(系)的光合特性比较与聚类分析

Comparison of Photosynthetic Characteristics and Cluster Analysis in Different Sweet Potato Varieties(Lines)

本研究以29份甘薯品种(系)为试材,利用便携式光合仪测定其光合性状,通过方差分析、主成分分析、聚类分析和相关性分析对其光合指标进行综合评价。结果显示29份甘薯品种(系) 7个光合指标存在显著差异,变异系数在9.98%~42.14%;相关性分析发现净光合速率(net photosynthetic rate,P_n)与胞间CO_(2)浓度(intercellular CO_(2)concentration,C_i)、气孔导度(stomatal conductance,G_s)、蒸腾效率(transpiration efficiency,TE)、水分利用效率(water use efficiency,WUE)和羧化效率(carboxylation efficiency,CE)间均存在极显著正相关,与蒸腾速率(transpiration,T_r)间未达到显著水平。通过主成分分析提取2个主成分特征值大于1,累计贡献率98.4%。系统聚类将其分为4个类群,其中类群Ⅲ的16份甘薯品种(系)在光合性能和产量性状上表现突出,这些品种在甘薯高光效高产育种上具有一定的利用价值。

Twenty-nine sweet potato varieties(lines)were used as trial materials.Explored using portable photosynthesiometer.Photosynthetic indicators of the germplasms were comprehensively evaluated by variance analysis,principal component analysis,cluster analysis and correlation analysis.The results showed that there were significant differences in the seven photosynthetic indicators of the twenty-nine sweet potato varieties(lines).The coefficient of variation index parameters ranged from 9.98%to 42.14%.In the correlation analysis,Pn was significantly positivel correlated with Ci,Gs,TE,WUE and CE.And was no significantly positivel correlated with Tr.Through principal component analysis,two principal components were extracted as all eigenvalues were greater than 1,and the cumulative contribution rate of variance reached 98.4%.Twenty-nine sweet potato varieties(lines)could be divided into five groups.Among them,16 sweet potato varieties(lines)of groupsⅢperformed outstandingly in aspects of net photosynthetic rate and yield traits.These varieties have certain utilization value in the breeding of sweet potato with high photosynthetic efficiency and high yield.