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Differential efficiency of photosynthetic oxygen evolution in flashing light in triazine resistant and triazine susceptible biotypes of senecio vulgaris



Differential efficiency of photosynthetic oxygen evolution in flashing light in triazine resistant and triazine susceptible biotypes of senecio vulgaris



Biochimica et Biophysica Acta 722(2): 245-255



Photosynthetic O2 evolution in response to flashing light was studied in triazine-susceptible and triazine-resistant biotypes of S. vulgaris L. Studies were conducted to determine if the modification of the herbicide-binding site which confers s-triazine resistance also affects the O2-evolving system. O2 evolution was measured using a Joliot-type O2-specific electrode on broken, stroma-free chloroplasts of both biotypes. Abnormal patterns of O2 evolution occurred in resistant chloroplasts. The S'1 .fwdarw. S2 transition is slower while the S2 decay is faster. The S'2 .fwdarw. S3 transition is slightly faster in resistant chloroplasts, while the decay of the S3 state is the same as in susceptible chloroplasts. These altered kinetics may be due to altered Q .fwdarw. B (B-) electron flow in resistant chloroplasts. Evidently, back-reactions from the reducing (acceptor) side of photosystem II to the oxidizing (donor) side occur with greater frequency in resistant than susceptible chloroplasts. These events are responsible for lower O2 yield and increased misses and double hits, resulting in abnormal yield patterns and lower quantum yield of CO2 fixation in resistant chloroplasts compared to the susceptible ones.

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Accession: 005155658

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