Resumo
A type of leaf chlorosis is shown by plants of excelsa coffee growing in nursery beds in a lath house at the Instituto Agronômico, Campinas. Tests made with various elements showed that this type of chlorosis is due to iron deficiency. Seedling plants of arabica coffee growing in the same beds do not show chlorosis, but these symptoms are exhibited by arabica scions grafted on some excelsa rootstocks. Scions from chlorotic excelsa plants recover the normal color when grafted on arabica rootstock. Likewise, arabica scions that had become chlorotic after being grafted on excelsa rootstock recovered when transferred onto an arabica rootstock. Other grafting tests indicated that no pathological cause seems to be associated with this type of chlorosis, and that it is probably due to genetical characteristics of the excelsa root system that prevents the plants from absorbing enough iron from the soil imder marginal conditions.
Clorose das fôlhas do cafeeiro excelsa
A. S. CostaI; J. E. Teixeira MendesII
IEngenheiro agrônomo, Secção de Genética
IIEngenheiro agrônomo, Secção de Café, Instituto Agronômico de Campinas
SUMMARY
A type of leaf chlorosis is shown by plants of excelsa coffee growing in nursery beds in a lath house at the Instituto Agronômico, Campinas. Tests made with various elements showed that this type of chlorosis is due to iron deficiency. Seedling plants of arabica coffee growing in the same beds do not show chlorosis, but these symptoms are exhibited by arabica scions grafted on some excelsa rootstocks. Scions from chlorotic excelsa plants recover the normal color when grafted on arabica rootstock. Likewise, arabica scions that had become chlorotic after being grafted on excelsa rootstock recovered when transferred onto an arabica rootstock. Other grafting tests indicated that no pathological cause seems to be associated with this type of chlorosis, and that it is probably due to genetical characteristics of the excelsa root system that prevents the plants from absorbing enough iron from the soil imder marginal conditions.
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LITERATURA CITADA
- 1. Costa, A. S. e C. M. Franco. A virus technique useful to diagnose foliar deficiencies. Plant Physiology (no prelo).
- 2. Franco, C. M. e H. C. Mendes. Sintomas de deficiências minerais no cafeeiro. Bragantia 9: 165-173. 1949.
- 3. Hewitt, E. J. The relation of manganese and other metal toxicities to the iron status of plants. British Science News 2: 13 6-119. 1949.
- 4. Mendes, J. E. Teixeira. Incompatibilidade entre cavalo e cavaleiro. Revista do Instituto de Café (S. Paulo) 14: 783-786. 1939.
- 5. Rawlins, T. E., e C. M. Tompkins. The use of carborundum as an abrasive in plant-virus inoculations. Phytopath. 26: 578-587. 1936.
- 6. Samuel, G., e J. G. Bald. On the use of primary lesions in quantitative work with two plant viruses. Ann. Appl. Biol. 20: 70-99. 1933.
Datas de Publicação
-
Publicação nesta coleção
25 Maio 2010 -
Data do Fascículo
1951
