Prolonged exposure of tobacco to a low oxygen atmosphere to suppress photorespiration decreases net photosynthesis and results in changes in plant morphology and chloroplast structure
1999
Migge, A. (Universitaet Bielefeld (Germany). Fakultaet fuer Biologie) | Kahmann, U. | Fock, H.P. | Becker, T.W.
Air-grown tobacco (Nicotiana tabacum) plants were transferred for one week into a low oxygen atmosphere (2 kPa O2, LO) to study both immediate and long-term effects of the suppression of photorespiration on net photosynthetic rate (PN), plant morphology, and chloroplast ultrastructure. The PN and the leaf conductance for CO2 increased upon exposure of attached tobacco leaves to LO. These results may suggest that under LO, external CO2 is used to consume the radiant energy normally utilized in photorespiration by net CO2 assimilation at the expense of an increased rate of transpiration. Prolonged LO-treatment of tobacco resulted in a decrease in the PN (measured in air) and in a reduction in the number of starch grains in the chloroplasts.
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