温州地区主栽蓝莓品种叶片饱和光强的研究

Studies on Light Saturation Point of Main Blueberry Cultivars in Wenzhou

摘要:

为探讨温州地区蓝莓（Vaccinium darrowixV. corymbosum）叶片的光饱和点，对2个蓝莓品种（‘奥尼尔’和‘薄雾’）叶片的光合速率和电子传递速率的光响应曲线进行拟合。结果表明，直角双曲线修正模型能较好地拟合光合速率和电子传递速率对光的响应曲线，给出的光饱和点值与实际观测值接近；而直角双曲线模型、非直角双曲线模型及指数方程模型拟合结果远低于实际观测值。在全光和遮荫下，‘奥尼尔’叶片的光饱和点分别为656.32~806.17和605.83~756.22 μmol m^-2s^-1；而‘薄雾’叶片的分别为1 034.63~1 641.25和933.09~988.18 μmol m^-2s^-1，说明这2个品种均为半阳生植物。

关键词:蓝莓;光合作用;光强;光响应模型

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