Photosynthetic and Transpiration Characteristics of 6 Cultivars in Pomegranate

In order to improve quality and yield,some photosynthetic and transpiration indexes of 6 cultivars in pomegranate were determined and analyzed by Li-6400 Photosynthetic System.The results showed that the light compensation point of 6 cultivars was from 25 μmol·m-2s-1 to 52 μmol·m-2s-1,and light saturation point was from 600 μmol·m-2s-1 to 1 050 μmol·m-2s-1.It explained differences of the 2 indexes between 6 species were little.But there were significant differences between diurnal variations of net photosynthetic rate.The diurnal variation curves of net photosynthetic rate of all 4 varieties had two peaks and an obvious midday depression at different time,while ones of both Erbenzi and Baiyu's maternal plant had one peak and no midday depression.The diurnal variation curves of transpiration rate of Bopicao,Dabenzi and Erbenzi were zigzag,ones of Baiyu's maternal plant and Yushizi had two peaks,one of Baiyu had a peak.The diurnal variation curves of intercellular CO2 concentration of 6 cultivars were V-shape.