Effects of Manganese Deficiency and Added Cerium on Photochemical Efficiency of Maize Chloroplasts |
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| Authors: | Chunxiang?Qu Xiaolan?Gong Chao?Liu Mengmeng?Hong Ling?Wang Email author" target="_blank">Fashui?HongEmail author |
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| Institution: | (1) Medical College of Soochow University, 215123 Suzhou, People’s Republic of China;(2) College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, People’s Republic of China;(3) Library of Soochow University, 215123 Suzhou, People’s Republic of China; |
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| Abstract: | The mechanism of the fact that manganese deprivation and cerium addition affect the photochemical efficiency of plants is
unclear. In this study, we investigated the improvement by cerium of the damage of the photochemical function of maize chloroplasts
under manganese-deprived stress. Chlorophyll fluorescence induction measurements showed that the ratio of variable to maximum
fluorescence (Fv/Fm) underwent great decreases under manganese deficiency, which was attributed to the reduction of intrinsic
quantum efficiency of the photosystem II units. The electron flow between the two photosystems, activities of Mg2+–ATPase and Ca2+–ATPase, and rate of photophosphorylation on the thylakoid membrane of maize chloroplasts were reduced significantly by exposure
to manganese deprivation. Furthermore, the inhibition of cyclic photophosphorylation was more severe than non-cyclic photophosphorylation
under manganese deficiency. However, added cerium could relieve the inhibition of the photochemical reaction caused by manganese
deprivation in maize chloroplasts. It implied that manganese deprivation could disturb photochemical reaction of chloroplasts
strongly, which could be improved by cerium addition. |
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