Studies on Light Saturation Point of Main Blueberry Cultivars in Wenzhou

Abstract:

In order to explore the light saturation point of blueberry (Vaccinium darrowixV. corymbosum) leaves in Wenzhou area, the light-response curves of electron transport rate and photosynthesis of blueberry cultivars ‘O’neal’ and ‘Misty’ under shading and full sunlight were fitted by four models, such as modified rectangular hyperbolic model (model I), rectangular hyperbola model (model Ⅱ), nonrectangular hyperbolic model (model Ⅲ) and exponential equation model (model IV). The results showed that the light response curves could be fitted well by the model I. The fitted values of light saturation point by model I were close to measure values, however, those fitted by model Ⅱ, model Ⅲ and model IV were lower than measure values. The light saturation points of ‘O’neal’ were 656.32-806.17 (full light) and 605.83-756.22 μmol m^-2s^-1(shading); and those of ‘Misty’ were 1 034.63-1 641.25 (full light) and 933.09-988.18 μmol m^-2s^-1(shading). In conclusion, the two blueberry cultivars were semi-heliophyte.

Key words:Blueberry;Photosynthesis;Light saturation point;Light-response model