Some aspects of the light reaction of photosynthesis in Dipterocarpus turbinatus C. F. Gaertn seedlings in Cat Tien Park, Vietnam

Abstract

The studies were carried out on 3 and 6 month old seedlings of Dipterocarpus turbinatus (C.F. Gaertn) were grown in the pots. Research on the diurnal dynamics of the leaf photosynthetic intensity under the same illumination conditions have shown that the photosynthesis of the seedlings was controlled by circadian cycles. The studies related to the dependence of the photosynthesis intensity on the light spectral composition showed that the red part of light spectrum with a wavelength of 660 nm had the greatest effect on photosynthesis in D. turbinatus. The results of dependence was described by a quadratic equation with a high degree of accuracy of the approximation (R2 ~ 1.0). The main conclusion that, in the studies related to plant photosynthesis, in addition to generally environmental factors that have been traditionally considered for in previous similar studies, their circadian rhythms should be taken into account.