Abstract
Anthracnose, generally caused by Colletotrichum gloeosporioides, affects inflorescences quality in different species of ornamental tropical plants and it is one of the main fungal diseases to those crops. The objective of this study was to evaluate the aggressiveness and exoenzimes production on solid medium of 25 Colletotrichum isolates collected from anthurium, torch ginger, and heliconia plants with necrosis symptoms. The symptomatic floral stems were harvested in different counties of the Pernambuco State, Brazil, and carried to the laboratory, where the isolation process took place. The isolates were inoculated in the floral stems bracts of the three species studied, and the aggressiveness evaluated five days after inoculation. Isolates were also plated on specific culture media to determine amylolytic, lipolytic, and proteolytic activity, and assessed seven days after inoculation. The isolates aggressiveness was variable and some of them were not pathogenic when inoculated to their origin hosts. Six isolates were pathogenic to all the analyzed ornamental species and four isolates showed host specificity. All tested isolates presented amylolytic, lipolytic, and proteolytic activity. No relation between aggressiveness and enzyme activity was observed in the isolates tested. KEY-WORDS: Anthurium andraeanum; Etlingera elatior; Heliconia spp.; variability.
Highlights
Mangabeira (Hancornia speciosa Gomes) is a native fruit species from the Brazilian savannah
Its sexual propagation depends on a suitable substrate
because it interferes with seed germination
Summary
O experimento foi instalado e conduzido de 04 de novembro de 2007 a 11 de abril de 2008, em casa-de-vegetação (cobertura de polietileno transparente e difusor de luz de 150 micras), na área experimental da Universidade Estadual do Mato Grosso do Sul (UEMS), Unidade Universitária de Cassilândia (19o05’S, 51o56’W e altitude de 471 m). A semeadura foi realizada logo em seguida, para que não ocorresse alteração da qualidade fisiológica (Barros 2006). Os recipientes utilizados foram tubetes com comprimento de 140 mm, diâmetro superior de 40 mm e capacidade de 130 cm. Os substratos resultantes das misturas foram analisados quimicamente (Tabelas 1 e 2), sendo as análises realizadas pelo Instituto Agronômico de Campinas (IAC). Resultados da análise química para macronutrientes, pH e condutividade elétrica (CE) de substratos utilizados em experimento de produção de mudas de mangabeira em tubetes (Cassilândia, MS, 2008)
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