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Photoprotective effects of high level expression Of C(4) phosphoenolpyruvate carboxylase in transgenic rice during photoinhibition

文献类型： 外文期刊

作者： Jiao, DM 1 ; Li, X 2 ; Ji, BH 2 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agrobiol Genet & Physiol, Nanjing 210014, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Agrobiol Genet & Physiol, Nanjing 210014, Peoples R China; Nantong Univ, Life Sci Coll, Nantong 226007, Peoples R China

关键词： carbon assimilation;carbonic anhydrase;chlorophyll fluorescence;3,3-dichloro-2-(dihydroxyphosphinoylmethyl)propenoate;enzymes scavenging active oxygen;malonyldialdehyde;Oryza;peroxidase;superoxide dismutase

期刊名称：PHOTOSYNTHETICA （ 影响因子：3.189； 五年影响因子：3.38 ）

ISSN： 0300-3604

年卷期： 2005 年 43 卷 4 期

页码：

收录情况： SCI

摘要： With untransformed rice cv. Kitaake as control, the characteristics of carbon assimilation and photoprotection of a transgenic rice line over-expressing maize phosphoenolpyruvate carboxylase (PEPC) were investigated. The PEPC activity in untransformed rice was low, but the activity was stimulated under high irradiance or photoinhibitory condition. PEPC in untransformed rice contributed by about 5-10 % to photosynthesis, as shown by the application of the specific inhibitor 3,3-dichloro-2-(dihydroxyphosphinoylmetliyl)propenoate (DCDP). When maize PEPC gene was introduced into rice, transgenic rice expressed high amount of maize PEPC protein and had high PEPC activity. Simultaneously, the activity of carbonic anhydrase (CA) transporting CO, increased significantly. Thus the photosynthetic capacity increased greatly (50 %) under high CO(2) supply. In CO(2)-free air, CO(2) release in the leaf was less. In addition, PEPC transgenic rice was more tolerant to photoinhibition. Treating by NaF, all inhibitor of phosphatase, showed that in transgenic rice more phosphorylated light-harvesting chlorophyll a/b-binding complexes (LHC) moved to photosystem 1 (PS1) protecting thus PS2 from photo-damage. Simultaneously, the introduction of maize PEPC gene Could activate or induce activities of the key enzymes scavenging active oxygen, such as Superoxide dismutase (SOD) and peroxidase (POD). Hence higher PS2 photochemical efficiency and lower superoxygen anion (O(2)(center dot-)) generation and malonyldiadehyde (MDA) content under photo inhibition Could improve protection from photo-oxidation.

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