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Effect of light quality on photosynthesis and contents of active ingredients in Saxifraga stolonifera Curt

A.N. He, C.W. She, X.J. Wu, S.H. Li and M.C. Zeng

To provide a theoretical basis for artificial cultivation of Saxifraga stolonifera, we cultured the plants under different types of agriculture films and compared their effect on photosynthesis, leaf microstructure and active ingredient contents using Li 6400 portable photosynthesis instrument, paraffin method and high performance liquid chromatography (HPLC). The results showed that the quality of transmitted light differed significantly under different film sheds, showing the highest UV transmittance under the white film shed as well as the highest red/blue ratio and lowest green/red ratio under the red film shed. Leaf gas exchange of S. stolonifera showed a “bimodal” diurnal variation curve under all sheds. Among them, S. stolonifera under red film shed showed the highest daily average net photosynthetic rate (PN) of 7.62 μmol m-2 s-1 and the greatest PN from the fitted photosynthesis-light response curve. Chlorophyll fluorescence parameter displayed that S. stolonifera under the red film shed had the highest electron transfer rate of 58.4 μmol m-2 s-1. Saxifraga stolonifera under red shed had the thickest mesophyll tissue and the highest active ingredient content and biological yield. In conclusion, shedding with red film is most conducive for photosynthesis of S. stolonifera.

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