Comparison of Photosynthetic Physiological Characteristics of Two Varieties of Green Pears and Their Red Mutations Varieties

Taking‘Zaosu'pear,‘Bartlett'pear,and red mutation‘Hongzaosu'pear,‘Red Bartlett'pear as materials,photosynthetic characteristics and the pigment content in the leaves of four varieties of pear were measured.The results showed that the diurnal variation of net photosynthetic rate presented single-apex curves,and the order was‘Zaosu' pear‘Hongzaosu'pear‘Red Bartlett'‘Bartlett'according to the amount of average diurnal variation of net photosynthetic rate.The diurnal variation of these pears' transpiration rate(Tr)all presented single-apex curves.The diurnal variation of stomatal conductance(Gs)of‘Zaosu'and‘Hongzaosu'presented double-apex curves and the others presented single-apex curves.The diurnal variation of intercellular CO2concentration(Ci)of‘Zaosu'and‘Hongzaosu' presented double-valley curves and the others presented single-valley curves.The diurnal variation of these four varieties of pears' instantaneous water use efficiency(WUE)and light use efficiency(LUE)all presented single-valley curves.The content of chlorophyll and anthocyanin in the leaves of‘Hongzaosu'pear and‘Red Bartlett'of red mutation significantly exceeded that of‘Zaosu'pear and‘Bartlett'respectively.