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2007 | 29 | 4 |
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Leaf anatomy and chloroplast ultrastructure of Mn-deficient orange plants

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Leaf samples of Mn-deficient and Mn-sufficient (control) ‘Navelate’ orange plants grown in a greenhouse were taken to investigate the effects of Mn deficiency in leaf structure and chloroplast ultrastructure. Total leaf chlorophyll concentration was significantly lower in Mn-deficient plants than in control ones. Entire lamina thickness was not altered due to Mn deficiency. However, Mn deficiency resulted in disorganization of mesophyll cells, mainly of palisade parenchyma cells. The number of mesophyll chloroplasts per cellular area and their length were both affected negatively. The membranous system of chloroplasts was also disorganized. The percentages of starch grains and plastoglobuli per chloroplast of Mn-deficient leaves were significantly greater than those of control leaves.
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  • Laboratory of Pomology, School of Agriculture, Aristotle University, 541 24 Thessaloniki, Greece
  • Department of Botany, School of Biology, Aristotle University, 541 24 Thessaloniki, Greece
  • Pomology Institute, N.AG.RE.F, P.O. Box 122, 592 00 Naoussa, Greece
  • Laboratory of Pomology, School of Agriculture, Aristotle University, 541 24 Thessaloniki, Greece
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