Female Gametophyte Genotype Selection and Its Progenies Phenotypic Genetic Segregation in Rice under Extreme Temperature

It is difficult to conduct temperature on female gametophyte selection. It is rare research on it. For exploring the selection of gametophyte, we treated booting stage and flowering stage with different temperatures and pollinated with Nan34, which produced 22 F1 female gametophyte genotype selection populations and their corresponding progeny F2 segregation populations. Six morphological traits of these F1 and F2 populations grown at three different altitude environments were analyzed. It was found that high and low extreme temperatures caused female gametophyte selection in the F1 populations, and then affected the phenotype genetic differentiation of their F2 progeny populations. The expression of selection effect at high temperature 35℃ treatment was stronger than at low temperature 16℃, that at flowering stage was also stronger than at booting stage. The selection populations which were treated by low temperature treatment and grew at altitude of 2200m and 1860m appeared the higher setting rate and weaker growth potential, but the trend at high temperature treatment was reverse. In addition, different altitude environments could affect the expression of morphological characters and the effect at the altitude of 1860m was weak. The results provide a reference for developing breeding method of female gametophyte genotype selection.