Department of Horticulture, Michigan State University, 48824-1112, East Lansing, MI, USA.
Photosynth Res. 1983 Jan;4(1):307-16. doi: 10.1007/BF00041828.
Diurnal and seasonal net photosynthetic rates (Pn) of sour cherry were determined. Leaf Pn was not significantly affected by shoot excision. Under constant environmental conditions (PFD, 1200 μmol m(-2) s(-1); temp. 25; relative humidity, 80-90%) there was no significant diurnal fluctuation in Pn for individual leaves. However, there was a pronounced fluctuation in Pn for whole trees measured under constant temperature but natural variation in sunlight from sunrise to sunset. Maximum Pn occurred before solar noon, remained constant for 1-2 hr, then declined. Photosynthetic rate of recently expanded leaves fluctuated through out the season but, in general, was greatest in the spring as leaves expanded, reached a peak, remained stable for several weeks, then gradually declined. The Pn of leaves on terminal shoots was not significantly different from the Pn of leaves on spurs of the same physiological age. The presence of fruit did not have a consistent effect on the Pn of sour cherry leaves.
测定了酸樱桃的日变化和季节净光合速率（Pn）。 芽切对叶片 Pn 没有显著影响。 在恒定的环境条件下（PFD，1200 μmol m(-2) s(-1)；温度 25；相对湿度 80-90%），单个叶片的 Pn 没有明显的日变化。 然而，在恒定温度下但从日出到日落阳光的自然变化下测量整棵树时，Pn 有明显波动。 最大 Pn 出现在中午前，持续 1-2 小时，然后下降。 新展开叶片的光合速率在整个季节波动，但通常在春季叶片展开时最大，达到峰值，稳定数周，然后逐渐下降。 顶端枝条上叶片的 Pn 与同一生理年龄的短枝叶片的 Pn 没有显著差异。 果实的存在对酸樱桃叶片的 Pn 没有一致的影响。
