ISHS Acta Horticulturae 769: XXVII International Horticultural Congress - IHC2006: International Symposium on Asian Plants with Unique Horticultural Potential
DAILY CHANGES IN THE PHOTOSYNTHETIC RATE AND CHLOROPHYLL FLUORESCENCE IN FOUR COLORED LEAF PRUNUS TAXA |
| Authors: | Q.J. Wang, Y.M. Li, F.M. Lv, H.R. Shu, X. Shen |
| Keywords: | P. persica Bastsch var. dupelex Sieb. et Zucc, P. cerasifera var. atropurpurea Jacg., P. ×bliriana 'Meirenmdi', P. ×cistena 'Pissardii', photosynthetic rate, chlorophyll fluorescence |
| Abstract:
Daily changes in the photosynthetic rate and chlorophyll fluorescence were investigated using four colored leaf Prunus taxa, i.e., P. persica var. dupelex, P. cerasifera var. atropurpurea, P. ×bliriana ‘Meirenmdi’, and P. ×cistena ‘Pissardii’. P. persica var. compressa, a green leaf variety, was used as the control. The results indicated that all colored leaf plants had lower photosynthetic rates than the green leaf plant. They were also found to be much more sensitive to light intensity. The daily change of the photosynthetic rate of P. ×bliriana ‘Meirenmdi’ was a three-peak curve, and the daily changes of the other three were double-peak curves. All colored leaf plants undergo the phenomenon of “noon break.” At about 12:00 noon, their duration becomes shorter than that of the green leaf plant. The “noon break” phenomenon is regulated by stoma. There were no differences found between colored leaf plants and the green leaf plant in intrinsic photochemical efficiency (Fv/Fm), but the quantum yield of PSII (φPSII) and photochemical quenching (qP) of colored leaf plants were lower than these in the green leaf plant. Non-photochemical quenching (NPQ) of colored leaf plants was higher than that of green leaf plant. | |
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