Analyses of Genetic and Photosynthetic Physiological Characteristics of a Green Revertible Albino Rice Mutant

A green revertible albino(gra) mutant was found from the rice breeding matierals. The mutant turned albino from edge to inter of leaf in 2~4 leaf stage. The 2nd and 3rd leaves were albino seriously. The 4th leaf turned green and the following leaves were normal green. At the same time the initial three leaves gradually convert to green, then the mutant plant is similar to the wild type. Genetic analysis showed that the trait was controlled by one nuclear recessive gene.The mutant was cultured under different tempretures, which revealed that the mutant was sensitive to low temperature and the albino leaves appearred below 24 ℃. In field condition the chlorophyll contents of mutant were 36% compared with the wild type at 3th leaf stage and then was similar to wild type from the 5th leaf stage to booting. The photosynthetic physiological traits of the mutant and the wild type including net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs) and intercellular CO2concentration(Ci), had no difference from 5th leaf stage to booting. The mutant was albino at seedling stage. The phenotypic trait was easy to be identified. It had no harmful effect on final grain yield after turning green. It will be an ideal marker in rice breeding.