Photosynthetic responses of Pisum sativum to an increase in irradiance during growth 1. Photosynthetic activities
1987
Chow, W.S. | Anderson, J.M. (Commonwealth Scientific and Industrial Research Organization, Canberra (Australia). Div. of Plant Industry)
The extent and time course of changes in photosynthetic activities of leaves and isolated chloroplasts was followed in pea plants which were adapted to low light, and subsequently transferred to higher light. The photosynthetic rates of leaves, measured at light saturation or subsaturation, increased with no noticeable lag, doubling within 1 week after transfer to high light. In contrast, the increase of in vitro ribulose-1,5-bisphosphate carboxylase activity and photosystem II electron transport capacity occurred with an apparent lag of about 1 day after transfer to high light. The capacity for uncoupled whole-chain electron transport also increased slowly. Whilst the total chlorophyll (Chl) per unit leaf area remained steady, the Chl a:Chl b ratio increased with no apparent lag phase.
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