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Plant Physiology 93:1316-1320 (1990)
© 1990 American Society of Plant Biologists

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Development and Growth Regulation

Oxygen-Evolving Activity of Thylakoids from Barley Plants Cultivated on Different Concentrations of Jasmonic Acid 1

Liliana Todorova Maslenkova, Yuli Zanev and Losanka Petrova Popova

Institute of Plant Physiology, Bulgarian Academy of Sciences, Acad. G. Bonchev str., Bldg. 21, Sofia 1113, Bulgaria

The kinetics characteristics of oxygen evolution in thylakoids prepared from barley (Horeum vulgare) seedlings grown in the presence of different jasmonic acid (JA) concentrations were studied. In comparison to control preparations, 100 micromolar JA-treated samples show an inhibition of the Hill activity (46%) and of O2-flash yields to above 70%. A damping in the oscillations of O2 yields, induced by a flash train, increases with increasing growth regulator concentration. After these treatments, the value of the total number of oxygen-evolving centers (S0 + S1), estimated according to the Kok scheme, shows a considerable decrease. In 100 micromolar JA-treated preparations, the turnover half-time of S1-states increases and the stability of the S2- and S3-states decreases.

1 This work was supported by funds from the Institute of Plant Physiology at the Bulgarian Academy of Sciences.






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Copyright © 1990 by the American Society of Plant Biologists