| The genetic parameters of morphological characters were analyzed in F2 populations planted at same location, which
populations generated at four different altitudes of 400, 1 200, 1 860 and 2 200 m. The material female parent is Nan34, an improved line that cytoplasm donated by indica rice, and male parent is Xiaobaigu, a japonica rice landrace grown at Yunnan alpine region at 2650 m.The results showed that the average values of heading days, plant height, and flag-leaf width are increasing with the rising F2-generated altitude, however, the average values of flag-leaf length, effective panicles, panicle length, panicle node length, total grains per panicle,and spikelet fertility are decreasing with the rising F2-generated altitude. In addition, the variation coefficient, broad heritability, genetic advance and genetic skewness of the morphological traits in F2 populations are significantly different with F2-generated altitudes. The genetic distances based on morphological characters showed that the four F2 populations generated from hybrids at different altitudes had obviously genetic differentiation. The results indicate that the F2-generated altitude variation had strong effects on morphological traits. |
