Study on the Photosynthetic Characteristics of Three Lily Cultivars

In order to guide the lily anti-season cultivation,using the Li-6400 portable photosynthesis system,three flowering lily cultivars(Pollyanna,Brunello,Elite)were measured with the chlorophyll content and chlorophyll a/b,stomata exchange parameters of different leaf position,and the response curves of photosynthetic active radiation-Pn,the response curves of intercellular CO2concentration-Pn in greenhouse on November at cloudy and rainy area.The results showed that the variation trends of the chlorophyll a+b on different leaf position of three cultivars were inconsistent,the highest chlorophyll of the Pollyanna were on the under part leaves,the highest chlorophyll of the Brunello were on the under and middle part leaves,and the higher chlorophyll of the Elite were on the upper and middle part leaves.While the highest chlorophyll a/b of three cultivars were all on the upper part leaves.The highest Pn of Pollyanna and Elite leaves were on the middle part leaves,and the minimum were on the under part leaves,while the highest Pn of Brunello was on the upper part leaves,the minimum was on the under part leaves.The variation trends of Pn on different leaf position with the variation trends of stomata conductance,intercellular CO2 concentration,transpiration rate and water utilization rate was similar,while with vapor pressure deficit was opposite.Three lily cultivars had lower light compensation point(2.36~18.92μmol·(m2·s)-1),dark respiration rate(0.496~0.651μmol·(m2·s)-1),apparent quantum efficiency(0.036 5~0.041 9),and higher light saturation point(1 163~1 236μmol·(m2·s)-1),and maximum net photosynthetic rate(10.11~13.94μmol·(m2·s)-1),and had higher capacity on utilizing low light,could adapt a wide range of light density.All three lily cultivars had lower light compensation point(12.19~63.71μmol·(m2·s)-1),higher light compensation point CO2(1 257~1 313μmol·(m2·s)-1),and photosynthetic rate(18.74~20.50μmol·(m2·s)-1),which suggests that these cultivars had higher capacity of carbon source assimilation.