Seed germination and development of desert rose seedlings (Adenium obesum Roem. & Schult) on different substrates

2020 
EnglishDesert rose (Adenium obesum) is a succulent plant that is native to the Arabian Peninsula. It has great commercial value with exuberant structure and flowering. It can be propagated by seeds to ensure maximum development of the caudex. Despite its high economic value, studies on its propagation are still required. The aim of this study was to evaluate seed germination performance and seedling development of desert rose seedlings in different substrates. Treatments comprised five different substrate compositions: S1 (Soil), S2 (Sand), S3 (Carolina Soil commercial substrate), S4 (Sand + Carolina Soil), and S5 (Soil+ Carolina Soil). The following were evaluated using uni- and multi-variate approaches: germination, first count, germination speed index, caudex diameter, number of leaves, seedling length, root length, shoot length, and fresh mass and dry mass. Sand is the ideal substrate for the germination of A. obesum seeds, while for forming seedlings, mixtures of the Carolina Soil commercial substrate with sand or soil should be used portuguesA rosa do deserto (Adenium obesum) e uma planta suculenta nativa da Peninsula Arabica, apresenta grande valor comercial, com estrutura e floracao exuberante. Sua propagacao pode ser por meio de sementes para garantir o maior desenvolvimento do caudex. Apesar do alto valor economico ainda se requerem estudos para sua propagacao. O objetivo foi avaliar o desempenho germinativo de sementes e desenvolvimento de mudas de rosa-do-deserto em diferentes substratos. Os tratamentos constaram em cinco diferentes composicoes de substrato: S1 (Terra), S2 (Areia), S3 (substrato comercial Carolina Soil), S4 (Areia+ Carolina Soil) e S5 (Terra + Carolina Soil). Foram avaliados com abordagem uni e multivariada: germinacao, primeira contagem, indice de velocidade de germinacao, diâmetro do caudex, numero de folhas, comprimento da plântula, comprimento da raiz, comprimento da parte aerea, massa fresca e massa seca. A areia e o substrato ideal para a germinacao de sementes de A. obesum, enquanto que para a formacao das mudas deve-se utilizar as misturas do substrato comercial Carolina Soil com areia ou terra
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