| 16691366 |
Riethmuller-Haage I, Bastiaans L, Harbinson J, Kempenaar C, Kropff MJ: Influence of the acetolactate synthase inhibitor metsulfuron-methyl on the operation, regulation and organisation of photosynthesis in Solanum nigrum. Photosynth Res. 2006 Jun;88(3):331-41. Epub 2006 May 12.
The influence of the acetolactate synthase inhibitor metsulfuron-methyl on the operation of the photosynthetic apparatus was examined on 4-weeks-old climate chamber-grown Solanum nigrum plant. To have an indication on the relative performance of the photosynthetic apparatus of ALS-treated plants, the level of carbon dioxide (CO (2)) fixation, the relative quantum efficiency of photosystem I (Phi (PSI)) or photosystem II (Phi (PSII)) electron transport and leaf chlorophyll content were assessed for both control and treated plants at 2, 4 and 7 days after application of the herbicide. Results indicated a progressive inhibition of the level of CO (2) fixation, the relative quantum efficiency of photosystem I (Phi (PSI)) and II (Phi (PSII)) electron transport and the leaf chlorophyll content already 2 days after application of the herbicide. The linear relationship between the photosystem I and II was unaltered by herbicidal treatment and was sustained under conditions where large changes in pigment composition of the leaves occurred. It appears that the stress-induced loss of leaf chlorophyll is not a catastrophic process but rather is the consequence of a well-organised breakdown of components. Under photorespiratory and non-photorespiratory conditions, the relationship between the index of electron transport flow through photosystem I and II and the rate of CO (2) fixation is altered so that electron transport becomes less efficient at driving CO (2) fixation. |
62(0,2,2,2) |