Abstract: In this paper,field experiment was conducted to analysis the canonical correlations of light and temperature with the yield and quality characters of F₁ ecological populations of 54 hybrid rice breeds.The results showed that the yield and quality characters of the populations were significantly correlated with the accumulated temperature,effective accumulated temperature,extreme temperature difference,and sunshine length through the growth period of hybrid rice.The first canonical correlation coefficient (λ₁) between the light and temperature during vegetative growth stage and the yield characters was 0.9975,with the canonical information accounted for 99.96% of the total canonical information,leading to 99.50% of yield variation.Light and temperature affected the yield of hybrid rice mainly through their effects on the total and effective numbers of grains’ spikelet and its fertility.In this aspect,accumulated and effective accumulated temperature played a determinative role during vegetative growth stage,while extreme temperature difference and sunshine length were the key factors during reproductive growth stage.As for the quality characters of hybrid rice,light and temperature mainly affected the percentage of polished to head rice,and in this aspect,accumulated and effective accumulated temperature played a determinative role before filling stage,while extreme temperature difference and sunshine length were the key factors after this stage.

Key words: Underground biomass, Turnover rate