Abstract:

Effects of doubled CO2 on the content of photosynthetic pigments and some photosynthetic functions of spring wheat under salt stress were studied. Chlorophyll and carotenoid content per unit fresh weight of leaves and the capacity of light energy absorption of chloroplasts containing equal chlorophyll were reduced by salt stress, as were the fluorescence quenching rate (△Fv/T) and the capacity of excitation energy distribution between PS Ⅱ and PS Ⅰ regulated Mg2+. However, these parameters all increased in the presence of doubled CO2. The results indicated that the unfavourable effects of salt stress on photosynthetic functions could be alleviated by high CO2 concentration.

Key words: Spring wheat, Doubled CO2 concentration, Salt stress, Photosynthetic pigments, Light energy absorpti