Cerium Relieves the Inhibition of Chlorophyll Biosynthesis of Maize Caused by Magnesium Deficiency |
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Authors: | Min Zhou Xiaolan Gong Wang Ying Liu Chao Mengmeng Hong Ling Wang Hong Fashui |
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Institution: | (1) Medical College of Soochow University, 215123 Suzhou, People’s Republic of China;(2) Department of Mathematics and Nature, Lasa Normal Higher Training School, 850000 Lasa, People’s Republic of China; |
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Abstract: | Lanthanoids (Ln) were demonstrated to improve chlorophyll formation and the growth of plants. But the mechanism of the fact
that Ln promotes chlorophyll biosynthesis of plants is poorly understood. The main aim of the study was to determine Ln effects
in chlorophyll formation of maize under magnesium (Mg) deficiency. Maize plants were cultivated in Hoagland’s solution. They
were subjected to Mg deficiency and to cerium administered in Mg-deficient Hoagland’s media, and then the contents of various
chlorophyll precursors and gen expressions of the key enzymes of chlorophyll biosynthesis were examined. The decrease of chlorophyll
contents in maize leaves caused by Mg deficiency suggested an inhibition of chlorophyll synthesis that was inhibited by a
reduction of the precursors as measured by analyzing the contents of δ-aminolevulinic acid, porphobilinogen, uroporphyrinogen
III, Mg–protoporphyrin IX, and protochlorophyll, as well as the expression levels of magnesium chelatase, magnesium-protoporphyrin
IX methyltransferase, and chlorophyll synthase; Mg deficiency significantly inhibited the transformation from coproporphyrinogen
III or protoporphyrin IX to chlorophyll. However, cerium addition significantly relieved the inhibition of chlorophyll biosynthesis
in maize caused by Mg deficiency and increased chlorophyll content and promoted a series of transformations from δ-aminolevulinic
acid to chlorophyll and maize growth under Mg deficiency. It implied that cerium might partly substitute for the role of Mg. |
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