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Photosynthetic Characteristics of Four Wild Dendrobium Species in China

文献类型： 外文期刊

作者： Wu, Gang-Yi 1 ; Hui, Jun-Ai 1 ; Wang, Zai-Hua 1 ; Li, Jie 2 ; Ye, Qing-Sheng 1 ;

作者机构： 1.S China Normal Univ, Coll Life Sci, Guangdong Prov Key Lab Biotechnol Plant Dev, Guangzhou 510631, Guangdong, Peoples R China

2.Guangdong Acad Agr Sci, Environm Hort Res Inst, Guangzhou 510640, Guangdong, Peoples R China

关键词： C3 pathway;Dendrobium orchid;leaf anatomical structure;net photosynthetic rate;photosynthetic physiology

期刊名称：HORTSCIENCE （ 影响因子：1.455； 五年影响因子：1.617 ）

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收录情况： SCI

摘要： Photosynthetic physiology of Dendrobium nobile, Dendrobium pendulum, Dendrobium chrysotoxum, and Dendrobium densiflorum was studied. A bimodal diurnal variation of the net photosynthetic rate (P) was observed in the four Dendrobium species with the first peak [5.09 to 6.06 mu mol (CO2) per m(-2).s(-1)] approximate to 1100 HR and the second peak [3.83 to 4.58 mu mol (CO2) per m(-2).s(-1)] at 1500 HR. No CO2 fixation was observed at night. For all four Dendrobium species, the light compensation point (LCP) was 5 to 10 mu mol.m(-2).s(-1), light saturation point (LSP) ranged from 800 to 1000 mu mol.m(-2).s(-1), apparent quantum yield (AQY) was 0.02, and CO2 compensation points (CCP) and saturation point (CSP) were 60 to 85 mu mol.mol(-1) and 800 to 1000 mu mol.mol(-1), respectively. Carboxylation efficiency (CE) values ranged from 0.011 to 0.020. The optimum temperature for photosynthesis was between 26 and 30 degrees C. The measurement of P-n seasonal variation indicated that July to August had the higher P-n for Dendrobium species. Additionally, the chlorophyll a/b (Chl a/b) ratios of the leaves were 2.77 to 2.89. Measurement of key enzymes in the photosynthetic pathway indicated relatively high Ribulose-1,5-bisphosphate carboxylase (RuBPCase) and glycolate oxidase (GO) activities but very low phosphoenolpyruvate carboxylase (PEPCase) activities. It suggested that these four Dendrobium species are typical semishade C-3 plants

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