Journal
BIOLOGIA PLANTARUM
Volume 56, Issue 1, Pages 50-56Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s10535-012-0015-4
Keywords
gene expression; iron deficiency; transgenic Arabidopsis
Categories
Funding
- genetically modified organisms breeding major projects [2009ZX08009-122B]
- New stars on Science and Technology of Beijing [2008B74]
- National Natural Science Foundational of China [30800741]
- Chinese universities scientific funds [2009-2-06]
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Iron is one of the essential micronutrients required by all living organisms. In this study, we isolated a gene encoding putative citrate synthase (CS) from Malus xiaojinensis, designated as MxCS1. The MxCS1 gene encodes a protein of 473 amino acid residues with a predicted molecular mass of 52.5 kDa and a theoretical isoelectric point of 8.67. The expression of MxCS1 was enriched in the leaf rather than in phloem and root, however, its expression was hardly detected in the xylem. The gene expression was strongly induced by Fe stress treatment in the M. xiaojinensis seedlings. Over-expression of MxCS1 improved Fe deficiency tolerance in transgenic Arabidopsis. We argued that MxCS1 is a new member of the CS genes, and it may function as a regulator in response to iron stress in plants.
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