Leaf anatomy and carbon isotope composition in Coffea species related to photosynthetic pathway
The possible presence of vascular bundle sheath cells and its relation to photosynthetic pathway, leaf anatomy, and carbon isotope composition (delta13C) were examined in six species of the genus Coffea: C. arabica (cultivars Catuai Vermelho, Mundo Novo, Bourbon Vermelho, and Icatu Amarelo), C. canephora (cultivars Apoata and Guarini), C. liberica, C. dewevrei (C. liberica), C. salvatrix, and C. stenophylla. In all genotypes, the vascular bundle was surrounded by a layer of cells with numerous chloroplasts in a centrifugal position. Visually no differences could be seen between the spongy parenchyma cells and the bundle sheath cells, neither in size nor in chloroplast number. The leaf delta13C values ranged between a maximum of -26.2 per mil in C. salvatrix and a minimum of -29.7 per mil in C. liberica. A strong correlation (r=0.972, p=0.001) between delta13C and anatomical characteristics was observed in coffee species. C. salvatrix exhibited the highest delta13C values and the most compact mesophyll, with more palisade and spongy parenchyma cells in contact with the vascular bundle sheath.
| Main Authors: | , , , |
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| Format: | biblioteca |
| Published: |
2003
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| Subjects: | COFFEA, COFFEA ARABICA, COFFEA CANEPHORA, COFFEA LIBERICA, COFFEA STENOPHYLLA, CARBONO, CLOROPLASTO, CAFE, VARIEDADES, ISOTOPOS, HOJAS, MESOFILO, PARENQUIMA, FOTOSINTESIS, ANATOMIA DE LA PLANTA, HACES VASCULARES, |
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| Summary: | The possible presence of vascular bundle sheath cells and its relation to photosynthetic pathway, leaf anatomy, and carbon isotope composition (delta13C) were examined in six species of the genus Coffea: C. arabica (cultivars Catuai Vermelho, Mundo Novo, Bourbon Vermelho, and Icatu Amarelo), C. canephora (cultivars Apoata and Guarini), C. liberica, C. dewevrei (C. liberica), C. salvatrix, and C. stenophylla. In all genotypes, the vascular bundle was surrounded by a layer of cells with numerous chloroplasts in a centrifugal position. Visually no differences could be seen between the spongy parenchyma cells and the bundle sheath cells, neither in size nor in chloroplast number. The leaf delta13C values ranged between a maximum of -26.2 per mil in C. salvatrix and a minimum of -29.7 per mil in C. liberica. A strong correlation (r=0.972, p=0.001) between delta13C and anatomical characteristics was observed in coffee species. C. salvatrix exhibited the highest delta13C values and the most compact mesophyll, with more palisade and spongy parenchyma cells in contact with the vascular bundle sheath. |
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