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木本植物阳生和阴生叶片叶绿体O2和NO2-光还原作用
林植芳, 彭长连, 林桂珠
作者单位
林植芳, 彭长连, 林桂珠  
摘要:  在有PCR和PCO环活性抑制剂甘油醛和光合磷酸化解偶联剂NH4CL存在下,比较了生长于3种 光环境的乔木黧蒴和灌木九节幼苗阳生和阴生叶片叶绿体的O2和NO2-光还原速率。全自然光下两种 植物阳生叶片的叶绿体O2的光还原速率最高,占总光合电子传递活性的66%-68%,NO2-光还原速率 也有类似趋势占总电子传递的11%-15%左右。36%和16%自然光下阴生叶片O2和NO2-光还原 速率及O2光还原电子传递的比例显著降低,但NO2-光还原电子传递的比例不受影响。与NO2-光还原 相关的叶片NiR和NR活性及NiR/NR活性比也因叶片接受光强度大小而异,随光强减弱,黧蒴的NiR活性降低,九节的NR活性增高,但黧蒴的NR活性和九节的NiR活性变化未达差异显著性。
关键词:  O2的光还原  NO2-光还原  木本植物  叶绿体  光环境  亚硝酸还原酶
DOI:10.3969/j.issn.1005-3395.2001.1.001
分类号:
基金项目:
THE O2 AND NO2- PHOTOREDUCTION IN CHLOROPLASTS OF SUN AND SHADE LEAVES OF WOODY PLANTS
LIN Zhi-fang, PENG Chang-lian, LIN Gui-zhu
Abstract:  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 l1%-15% of total electron transport activity.Shade leaves exposed to 36% and 16% of full sun light significantly decreased the photoreduction rates of 02 and NO2- and the percentage of 02 photoreduction to total electron transport,but had no effect on the percentage of electron transport partitioning to NO2- photoreduction. The activities of nitrite reductase(NiR),nitrate reductase (NR)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 1.7—2.2 in shade 1eaves.
Key words:  Oxygen photoreduction  Nitrite photoreduction  Chloroplasts  Woody plants  Light intensity  Nitrite reductase

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