Abstract:

Effects of photosynthesis response to different temperature and light condition were studied according to measure the light curves of three strawberry cultivars in greenhouse. The differences of photosynthesis characteristic parameters were studied using ‘Jingyao’, ‘Hongjia’ and ‘Gongsimeiyihao’ as materials under 25, 30 and 35℃ conditions. The results showed that: (1)photosynthetic rate, stomatal conductance, transpiration rate increased first then decreased while the intercellular CO2 concentration decreased with the higher photosynthetic active radiation under same temperature conditions. (2)The light saturation point, apparent quantum efficiency, light-saturated photosynthetic rate of strawberry cultivar ‘Hongjia’ and ‘Gongsimeiyihao’ were promoted while light compensation points of them were lower by the rising temperature in the range of 25-35℃. To strawberry ‘Gongsimeiyihao’, light saturation point, apparent quantum efficiency, light saturated photosynthetic rate was highest while the light compensation point was lowest when the temperature was 30℃ among three treatments in the rage of 25-35℃. (3)Optimal photosynthesis conditions of ‘Jingyao’ and ‘Hongjia’ was 35℃ and 1050 μmol/ (m2?s) photosynthetic active radiation, to strawberry cultivar ‘Gongsimeiyihao’, the optimal photosynthesis condition was 35℃ and 1200 μmol/(m2?s) photosynthetic active radiation.