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Carl-Otto Ottosen

Oxygen evolution in clones of Ficus benjamina L. grown in different environmental conditions

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Two clones of Ficus benjamina L. known to differ in growth rate were grown at 18, 20, 24 and 30°C and at PPFDs of 70, 140 and 200 μmol m-2 s-1. Light response curves were measured at growth temperature and at lower and higher temperature conditions in order to estimate differences in clonal responses. Values of maximum rate of photosynthesis (Pmax), apparent quantum yield (φ), saturating PPFD (Is) and apparent quantum efficiency were used to evaluate the state of the photosynthetic apparatus. No clonal differences were found, when plants were grown or measured at suboptimal temperatures (18°C), and only small differences were caused by different irradiances during growth. With higher cultivation temperature, clonal differences in Pmax became pronounced. Apparent quantum yield (φ) was lowest at 18°C, but increased with temperature. The results stress that observed differences in gas exchange after pretreatment form a complex pattern owing to basic differences in gas exchange and differences in temperature response. However genetic differences in photosynthesis were most clearly expressed in Pmax. This fact may be useful to include in greenhouse climate control models.

TidsskriftScientia Horticulturae
Sider (fra-til)311-318
Antal sider8
StatusUdgivet - nov. 1991
Eksternt udgivetJa

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