Gas exchange characteristics of four domesticated Primula species

摘要

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, ìmol m‐2 s‐1), light saturation point (LSP, ìmol m‐2 s‐1), and CO2 compensation point (CCP, ìmol 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 1300h, respectively. P. pulverulenta and P. bul...