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《Journal of Tropical and Subtropical Botany》 2001-01
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THE O_2 AND NO_2~- PHOTOREDUCTION IN CHLOROPLASTS OF SUN AND SHADE LEAVES OF WOODY PLANTS

LIN Zhi-fang, PENG Chang-lian, LIN Gui-zhu (South China Institute of Botany, the Chinese Academy of Sciences, Guangzhou 510650, China)  
O2 and NO2- photoreduction in chloroplasts isolated from the leaves of Castanopsis fissa (tree) and Psychotria rubra (shrub) seedlings grown under three light intensities were compared in the presence of glyceraldehyde (an inhibitor of PCR and PCO cycle\ activity) and NH4Cl (uncoupler of photophosphorylation). The highest rate of O2 photoreduction (Mehler reaction) was observed in chloroplasts from full sun-exposed leaves of both plants, Which was 66% -68% of total electron transport. NO2 photoreduction showed a similar trend, but it was only 11% - 15% of total electron transport activity. Shade leaves exposed to 36% and 16% of full sun light significantly decreased the photoreduction rates of O2 and NO2, and the percentage of O2 photoreduction to tota1 electron transport, but had no effect on the percentage of electron transport partitioning to NO2 photoreduction. The activities of nitrite reductase (NiR), nitrate reductase (N-R) in leaves and the ratio of NiR/NR. activity were also affected by light intensity. As the light intensity was reduced, NiR activity decreased in C fissa, and NR activity increased in P. rubra. whereas the changes in NR activity in C fissa or NiR activity in P. rubra were not significant. The ratio of NiR/NR activity in two sun leaves reached more than 3, and it was just l.7-2.2 in shade leaves.
【Fund】: 中国科学院重点基金资助项目!(KZ952-J1-105);; 广东省自然科学基金资助项目!(984011).
【CateGory Index】: Q945.11
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