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In vitro seed germination and seedling development of Annona crassiflora Mart. Germinação de sementes e desenvolvimento in vitro de plântulas de Annona crassiflora Mart

Annona crassiflora Mart known as 'araticum', 'marolo' or 'field araticum' is a typical fruit from the Cerrado biome of Brazil with socio-economic and medicinal importance. Normally, Annona crassiflora is propagated through seeds. However, due to a deep dormancy that the...

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Bibliographic Details
Published in:Scientia agricola 2009-06, Vol.66 (3), p.410-413
Main Authors: Márcia de Nazaré Oliveira Ribeiro, Moacir Pasqual, Fabíola Villa, Leila Aparecida Salles Pio, Henk William Maria Hilhorst
Format: Article
Language:English
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Summary:Annona crassiflora Mart known as 'araticum', 'marolo' or 'field araticum' is a typical fruit from the Cerrado biome of Brazil with socio-economic and medicinal importance. Normally, Annona crassiflora is propagated through seeds. However, due to a deep dormancy that the seeds display at dispersion and the difficulty to obtain uniform plants in a short time period, micropropagation may be a feasible alternative. Concentrations of gibberellic acid (GA3) and naphthalene-acetic acid (NAA) and their interactive effects on in vitro seed germination and seedling development of Annona crassiflora were studied. Mature fruits of Annona crassiflora were depulped and the seeds washed in clear water and dried at room temperature. Seed coat was removed and the seeds were placed on Murashige & Skoog (MS) medium supplemented with gibberellic acid (GA3) and naphthalene-acetic acid (NAA), 30 g L-1 sucrose and 6 g L-1 agar-agar. Seeds were kept under these conditions for 30 days. After this period, seedlings were kept for another 90 days on Wood Plant Medium (WPM) with 20 g L-1 sucrose and 5 g L-1 agar-agar supplemented with the same GA3 and NAA concentrations. Cultures were incubated under controlled conditions at 25 ± 2°C temperature, 16: 8 (light: dark) photoperiod of 32 µmol m-2 s-1 irradiance provided by cool white fluorescent tubes (Philips). Use of WPM medium supplemented with 25-32 mg L-1 GA3 or MS with 26-30 mg L-1 GA3 and 2 mg L-1 NAA promoted rooting and plant growth.O araticum ou marolo (Annona crassiflora Mart.) é uma fruta típica de Cerrado com grande importância sócio-econômico e medicinal. Sua propagação pode ser feita através de sementes, porém devido à dormência das sementes e dificuldade de se obterem plantas uniformes e em curto espaço de tempo, a micropropagação poderá ser uma alternativa. Estudaram-se os efeitos do GA3 associado ao ANA sobre a germinação de sementes e desenvolvimento in vitro de marolo. Frutos maduros foram despolpados e suas sementes lavadas e secas. Em seguida retirou-se o tegumento das sementes e estas foram colocadas em tubos contendo 20 mL de meio MS, acrescido de GA3 e ANA. Ao meio foram adicionados 30 g L-1 de sacarose e 6g L-1 de ágar, permanecendo nestas condições por 30 dias. Ao final dos 30 dias, as plântulas foram colocadas em meio WPM, acrescido de 20 g L-1 de sacarose, 5 g L-1 de ágar e suplementado das mesmas concentrações de GA3 e ANA da etapa anterior, onde permaneceram por 90 dias. Melhores resultados em meio WPM para
ISSN:0103-9016
1678-992X
DOI:10.1590/S0103-90162009000300017