Innovative utilization of Erianthus rockii germplasm II.Genetic analysis of important agronomic traits on F_1 of Saccharum officinarum and E.rockii

Six agronomic traits including average stalk weight,stalk length,stalk diameter,millable stalk,internode length and plot yield of a set of 62 populations of Saccharum officinarum Ludashi ×Erianthus rockii Yunnan 95-19 were investigated by using variance analysis,correlation analysis,stepwise regression analysis and path analysis.The results showed approximately normal distribution of frequency for these traits.Average stalk weight,stalk length,stalk diameter and internode length showed bi-directional transgressive segregation in the progeny populations with average phenotype value of millable stalk higher and average phenotype value of plot yield lower,compared to the parent populations.Millable stalk,internode length exhibited extremely significant correlation with plot yield,and average stalk weight showed significant correlation with plot yield.Millable stalk and internode length exhibited extremely significant correlation to yield per plot,and these two traits contributed 48.9% and 3.4% of genetic variation of the yield per plot,respectively.Average stalk weight showed a significant correlation with yeild per plot and contributed 32.3% of genetic varation of the yield per plot.Moreover,stalk length and stalk diameter were found to produce an indirect effect on yield per plot.Out of five traits millable stalk,average stalk weight and internode length turned out to be the most suitiable indices for selection.