Effect of Radiation and Temperature on Cranberry Photosynthesis and Characterization of Diurnal Change in Photosynthesis
Effect of Radiation and Temperature on Cranberry Photosynthesis and Characterization of Diurnal Change in Photosynthesis
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辐射和温度对蔓越莓光合作用的影响以及光合作用日变化的特征
DOI：
10.21273/jashs.129.1.0106
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
S. Kumudini
中科院分区：
文献类型：
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作者：
S. Kumudini
越橘(Vaccdium Maccarpon(Ait.))产量一直与光合作用产物的供应有关。然而，温度和辐射对小红莓光合作用的影响还不是很清楚。本试验的目的是研究越橘的光合作用对光照和温度的响应特性，以便建立一个估算越橘光合作用速率的模型。在气温为15~35℃、光照强度为200~1200µmol.m-2·S-1的条件下，测定了两个蔓越橘品种‘Stevensʼ’和‘Ben Learʼ’的光合作用响应。根据温度的不同，最大光合作用(Pmax)为10或12微克分子≈/m~2/S(净光合作用)，饱和辐射水平估计为600~800微克分子·m-2·S-1。小红莓的量子效率估计为0.03摩尔二氧化碳/摩尔光子。这两个模型：布莱克曼模型和Θ(曲率角)为0.99的非矩形双曲线都是在受控环境条件下测量光合作用速率的良好模型。模型预测值和中午前后的观测值之间的差异表明，潜在的光合作用速率在一天的周期中下降，这与中午低迷的现象一致。蔓越莓是美国北部沿海地区以及威斯康星州和加拿大部分地区的重要经济作物。商品越桔(Vaccdium Macrocarpon(Ait.)原产于酸性土壤，自然分布于沿海地区的沼泽和河岸。它是一种生长缓慢的爬行藤本植物，与另一种重要的北美原生果树蓝莓(Vaccdium CorymBosum)一起生长
Cranberry (Vaccinium macrocarpon (Ait.)) yield has been associated with photosynthate supply. However, the impact of temperature and radiation on photosynthesis of the cranberry plant is not well understood. The objective of this experiment was to characterize the photosynthetic response to radiation and temperature in order to develop a model for estimation of cranberry photosynthetic rates. Two cranberry cultivars, 'Stevensʼ and 'Ben Learʼ, were tested for photosynthetic response at air temperatures ranging from 15 to 35 °C and radiation intensities from 200 to 1200 µmol·m-2·s-1. Depending on temperature, maximum photosynthesis (Pmax ) was ≈10 or 12 µmol CO2/m2/s (net pho- tosynthesis) and the saturating radiation level was estimated to be 600 to 800 µmol·m-2·s-1. Cranberry quantum yield was estimated as 0.03 mol CO2/mol photon. Both models; Blackman and the nonrectangular hyperbola with a Θ (angle of curvature) of 0.99 were a good fi t for measured photosynthetic rates under controlled environment conditions. The disparity between modeled predicted values, and observed values in the fi eld around midday, indicates a reduction in potential photosynthetic rates in a diurnal cycle that is consistent with the phenomenon of midday depression. Cranberry is an important economic fruit crop in the north coastal regions of the United States as well as in Wisconsin and parts of Canada. The commercial cranberry (Vaccinium macro- carpon (Ait.)) is indigenous to acidic soils and is found naturally in marshes and river banks of coastal regions. It grows as a slow growing, creeping vine and is along with the other important native North American fruit crop, blueberry (Vaccinium corymbosum