Abstract: The photosynthetic Diurnal,light-response curves and the related leaf parameters of Lilium Sorbonne planted in common soilless culture medium(C) and peat alternative medium(A) were measured using a Li-6400 portable photosynthesis system.The leaf net photosynthetic rate(Pn) of Lilium Sorbonne′ grown both of the media showed a single peak curve,and the peak appeared at 9:00 am.The photosynthetic light-response curves were approximately the same in the plants grown in different substrates,while the light compensation points of plants in A and C were respectively 12 and 20 μmol/(m²·s),the light saturation points were 272 and 242 μmol/(m²·s) respectively,the Pm were 5.95,5.77 μmol/(m²·s) respectively,and dark respiration rates were 0.247 4,0.537 2 μmol/(m²·s) respectively.The Pn of plants cultivated in A in light intensity range of 272-1 000 μmol/(m²·s) kept stable around Pn-max,which indicated that the plants grown in substrate A had developed a much wider light range adaptation than those grown in substrates,and a higher capability of utilizing the high and low intensity of light.Therefore,the peat alternative medium can be used as substitute of common soilless culture medium in soilless culture of Lilium Sorbonne.

Key words: Lilium, Sorbonne, Diurnal photosynthesis, Light response, Common soilless culture medium, Peat alternative medium

CLC Number: 

• S513