Taxus cuspidate was chosen as the research object.The diurnal variation of photosynthetic rate, the photosyn-thetic response of different light intensities and chlorophyll fluorescence parameters were measured by using LI-6400 porta-ble photosynthesis measurement system.The results showed that diurnal variation of photosynthetic rate curve of female plant presented unimodal type, the male plant was double peaks and it had obvious midday rest phenomenon.The light sat-uration point of Taxus cuspidate was 520 umol· m-2 · s-1 .The light compensation point of Taxus cuspidate was 13.769 umol· m-2 · s-1 .It showed that Taxus cuspidata had strong tolerance of shade.The largest ( potential ) photochemical quantum efficiency Fv/Fm of chlorophyll fluorescence parameters between male and female plant was basically the same. While the excitation energy capture efficiency Fv′/Fm′of female plant was slightly higher than the male plant.The parame-ters Fv/Fm、Fv′/Fm′、qN、qP、φPsⅡ、ETR of male and female plant had no significant difference.It demonstrated that the photosystem II ( PSII) change of male and female plant were basically the same.

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