不同刺梨品种的光合特性

对刺梨的5个重要品种：贵农1号、贵农2号、贵农5号、贵农6号和贵农7号的营养枝和结果枝叶片的光合速率、光补偿点和光饱和点进行了测定。结果表明，叶片光合速率（Pn）由强到弱的顺序为：贵农6号〉贵农7号〉贵农2号〉贵农1号〉贵农5号；坐果情况会对光合速率产生重要影响，结果枝叶片的Pn高于营养枝叶片的Pn。各品种光补偿点由低到高为贵农2号〈贵农7号〈贵农1号〈贵农5号〈贵农6号；光饱和点由高到低为贵农7号、贵农2号〉贵农1号、贵农5号〉贵农6号，较低的光补偿点、较高的光饱和点是刺梨品种丰产的一般特点。

Study on Photosynthetic Characteristics of Rosa roxburghii. Tratt Varieties

Photosynthetic characteristics of leaves on the vegetative and fruiting cane of Rosa roxburghii.Tratt Varieties,Guinong 1,2,5,6,7 were studied in orchard.The results showed that the order of Pn from high to low was as follows: Guinong 6>7>2>1>5.Fruit setting would has a great effect on Pn,and Pn of fruiting shoot leaves was higher than that of vegetative cane leaves.The light compensation point of leaves of Rosa roxburgii.Tratt varieties presented from low to high as Guinong 2<7<1<5<6 and light saturation point as Guinong 6<1,5<7,2.Lower light compensation point and higher light saturation point were the general characteristics of high yielding varieties of Rosa roxburgii.Tratt.