Photosynthetica 2004, 42(2):263-271 | DOI: 10.1023/B:PHOT.0000040599.63773.ef

High Irradiance Induced Changes of Photosystem 2 in Young and Mature Needles of Cypress (Cupressus sempervirens L.)

N. La Porta1, M. Bertamini1, N. Nedunchezhian2, K. Muthuchelian1
1 Istituto Agrario di San Michele all' Adige, 38010, San Michele all' Adige, Italy
2 Centre for Biodiversity and Forest Studies, School of Energy, Environment and Natural Resources, Madurai Kamaraj University, Madurai Kamaraj University, Madurai-625 021, India

Photoinhibition of photosynthesis was studied in young and mature detached sun needles of cypress under high irradiance (HI) of about 1 900 μmol m-2 s-1. The degree of photoinhibition was determined by means of the ratio of variable to maximum chlorophyll (Chl) fluorescence (Fv/Fm) and electron transport measurements. Compared with the mature needles, the young needles, containing about half the amount of Chl a+b per unit area, exhibited a higher proportion of total carotenoids (Car) as xanthophyll cycle pigments and had an increased ratio of Car/Chl a+b. The potential efficiency of photosystem (PS) 2, Fv/Fm, markedly declined in HI-treated young needles without significant increase of F0 level. In contrast, the Fv/Fm ratio declined with significant increase of F0 level in mature needles. In isolated thylakoids, the rate of whole chain and PS2 activity markedly decreased in young HI-needles in comparison with mature needles. A smaller inhibition of PS1 activity was observed in both needles. In the subsequent dark incubation, fast recovery was found in both needle Types that reached maximum PS2 efficiencies similar to those observed in non-photoinhibited needles. The artificial exogenous electron donors DPC, NH2OH, and Mn2+ failed to restore the HI-induced loss of PS2 activity in mature needles, while DPC and NH2OH significantly restored it in young needles. Hence, HI-inactivation was on the donor side of PS2 in young needles and on the acceptor side of PS2 in mature needles. Quantification of the PS2 reaction centre proteins D1 and 33 kDa protein of water splitting complex following HI-exposure of needles showed pronounced differences between young and mature needles. The large loss of PS2 activity in HI-needles was due to the marked loss of D1 protein of the PS2 reaction centre in mature needles and of the 33 kDa protein in young needles.

Additional key words: acclimation to irradiance; chlorophyll fluorescence; D1 protein; donor side; electron transport; photoinhibition; photosystem 2; proteins

Published: June 1, 2004  Show citation

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La Porta, N., Bertamini, M., Nedunchezhian, N., & Muthuchelian, K. (2004). High Irradiance Induced Changes of Photosystem 2 in Young and Mature Needles of Cypress (Cupressus sempervirens L.). Photosynthetica, 42(2), 263-271. doi: 10.1023/B:PHOT.0000040599.63773.ef
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