Conservação de sementes de porta-enxertos de citros em função dos teores de água das sementes e do ambiente de armazenamento

• Autor(a) principal: Demba, Walter da Gloria Pimenta
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4592
• topic: Propagação dos citros; Tangerina cleópatra; Citrumelo swingle; Limão cravo; Propagation of citrus; Cleopatra mandarin; Swingle citrumelo; Rangpur lime; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA

The conservation of Citrus seeds is one of the biggest problems faced by seedling producers due to low seed longevity of this species, which lose viability quickly, compromising the availability of viable seeds during sowing. Thus, the domain of seed conservation techniques is of great importance for the Brazilian citrus production systems, allowing the preservation and maintenance of genetic and buffer stocks to meet unpredictable needs. In this sense, this study aimed evaluates the quality of Rangpur lime, 'Cleopatra' mandarin and Swingle citrumelo seeds stored with different water contents in two environmental conditions. The seeds were harvested in the orchard of the Fruit Sector of the Department of Plant Science at UFV. After extraction, the seeds went through the process of degumming, being rubbed with lime and then washed in water to remove the mucilage. Drying was performed in the shade and in plastic trays for 6 days to obtain the desired moisture contents, which were 35%, 15% and 7%. Subsequently, the seeds were treated with the fungicide Captan 2 g/kg. Then the seeds were placed in hermetic containers, stored at room temperature and under refrigeration for 360 days. Every 90 days, i.e., to 0 (after harvest), 90, 180, 270 and 360 days were conducted the moisture content and germination tests. Regardless of the degree of humidity, was markedly decreased of seeds quality of all varieties stored at room temperature. Seeds of Rangpur lime with water content of 7% maintained high quality physiological stored in refrigerator for 360 days, which did not occur in room temperature storage, where viability was lost from 180 days.