New Zealand Journal of Crop and Horticultural Science abstracts

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Gas exchange characteristics of four domesticated Primula species

Fei-hu Liu
Si-ming Hou

Faculty of Life Science
Yunnan University
2 North Cuihu Lake Road
Kunming 650091, People’s Republic of China
email: plantbreed2004@yahoo.com.cn

Xue-ni Liang

Faculty of Adult Education
Yunnan University
2 North Cuihu Lake Road
Kunming 650091, People’s Republic of China

Abstract Four wild Primula species were collected from the north-western mountainous area and planted in the field at Kunming, Yunnan Province, People’s Republic of China. Photosynthesis was tested by using a LiCor-6400 portable photosynthesis system to extend knowledge of photosynthesis of domesticated Primula. Specific differences were observed in light compensation point (LCP, µmol m–2 s–1), light saturation point (LSP, µmol m–2 s–1), and CO2 compensation point (CCP, µmol CO2 mol–1) of photosynthesis. Primula pulverulenta had the highest LCP (28), the other three species had lower LCP (13–15). P. obconica had a low LSP (80) and the highest CCP (75). P. bulleyana and P. pulverulenta both showed the highest LSP (c. 500) and an intermediate CCP (69–72), whereas P. forrestii had a middle LSP and the lowest CCP (60). The diurnal variations of photosynthetic rate (Pn) and transpiration rate in late July were single peak curves, reaching a maximum at c. 1000 and 1300 h, respectively. P. pulverulenta and P. bulleyana had the highest apparent quantum yield (0.043 and 0.037) and carboxylation efficiency (0.037 and 0.037), and the highest Pn (10.7 and 10.1 µmol m–2 s–1) under 800–2000 µmol m–2 s–1 of photosynthetically active radiation.

Keywords CO2 compensation point; diurnal variation; light compensation point; light saturation point; photosynthetic rate; Primula

New Zealand Journal of Crop and Horticultural Science, 2006, Vol. 34: 403–411
0014–0671/06/3404–0403      © The Royal Society of New Zealand 2006
H05099; Online publication date 20 November 2006. Received 30 August 2005; accepted 23 October 2006

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