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ABSTRACT: In sweet orange ?Pera-Rio? and acid lime ?Tahiti? citrus plants (Citrus spp.) stalked on ?Cleopatra? mandarin, a necrosis in the grafting point was observed, causing plant death and dry fruits. Aiming to identify the causes of changes in the rootstock, which lead to grafting incompatibility, an anatomical study comparing plants with and without symptoms, stalked on Rangpur lime, was performed. In addition, the plant nutritional conditions and soil fertility of orchards were evaluated. Necrotic processes caused by vascular discontinuity between the crown and the rootstock were the main causes of loss in productivity and fruit quality. The incompatibility between the rootstock with the crown of ?Pera-Rio? orange or ?Tahiti? lime causes plant nutritional imbalance that is not related to low natural fertility of the soil in the region. The results indicated problems in the use of ?Cleopatra? mandarin rootstock with the soil and climatic conditions of the Central Amazon region. Incompatibilidade de enxertia de base com tangerineira ?Cleopatra? em citros na Amazonia Central, Estado do Amazonas. RESUMO: Em plantas de laranjeira ?Pera-Rio? e de lima acida ?Tahiti? (Citrus spp.) enxertadas sobre tangerineira ?Cleopatra?, observaram-se uma necrose do ponto de enxertia, a morte das plantas e os frutos secos. Com o objetivo de detectar as causas das alteracoes no porta-enxerto que levaram a incompatibilidade de enxertia, realizou-se um estudo anatomico comparativo entre plantas com sintomas e plantas sem sintomas enxertadas sobre limao ?Cravo?, avaliando-se tambem o estado nutricional e a fertilidade do solo dos pomares. Processos necroticos ocasionados por descontinuidade vascular entre a copa e o porta-enxerto foram os principais fatores que levaram a perdas da produtividade e da qualidade dos frutos. A incompatibilidade entre o porta-enxerto e a copa de laranjeira ?Pera-Rio? ou a lima acida ?Tahiti? acarreta disturbio nutricional que nao tem relacao com a baixa fertilidade do solo da regiao. Os resultados indicaram problemas no uso de tangerineira ?Cleopatra? como porta-enxerto nas condicoes edafoclimaticas da Amazonia Central.

Incompatibility of Cleopatra mandarin rootstock for grafting citrus in Central Amazon, State of Amazonas, Brazil