ResumoObjetivou-se avaliar o tipo de rizoma e o seccionamento do rizoma principal de taioba na produção de mudas. O experimento foi conduzido em Cáceres MT, no período de outubro de 2006 a março de 2007. Foi utilizado o delineamento em blocos casualizados, com sete tratamentos (tipo de rizoma-semente) e quatro repetições: brotação secundária pequena (BSP), brotação secundária média (BSM), rizoma principal seccionado em duas partes (RPA1/2), rizoma principal apical seccionado em quatro partes (RPA1/4) e oito partes (RPA1/8); e rizoma principal basal seccionado em quatro partes (RPB1/4) e oito partes (RPB1/8). Os propágulos foram plantados em leitos com areia sob telado com sombreamento de 50%, sendo as mudas posteriormente transplantadas a campo para mensurar o desenvolvimento vegetativo. Os melhores resultados, quanto à emissão de brotações, massas fresca e seca das folhas e raízes, e o comprimento do pecíolo, foram observados nos propágulos RPA1/2, RPA1/4 e RPA1/8. Os tecidos da porção apical favoreceram o desenvolvimento de estruturas adventícias nos propágulos, promovendo o incremento em área foliar e comprimento de pecíolo no desenvolvimento posterior da muda. Observou-se viabilidade da utilização do método de seccionamento de rizomas principais para a produção de taioba. A produção de mudas de taioba pode ser feita pelo método de seccionamento de rizoma principal, em duas, quatro, ou em até oito partes, com a utilização da porção apical do rizoma.Palavras-chave adicionais: clone; horticultura tropical; porção apical; propagação; Xanthosoma sagittifolium (L.) Schott. AbstractThe objective of this study was to evaluate the type of rhizome and the ways of the sectioning of the main rhizome on the production of seedlings. The experiment was carried out in Cáceres, state of Mato Grosso, Brazil, from October of 2006 to March of 2007. The experiment was set according to a randomized complete block design with seven treatments (only rhizome types ) and four repetitions : small secondary sprouting (BSP), medium secondary sprouting (BSM), main rhizome divided in two parts (RP1/2), apical main rhizome divided in four (RPA1/4) and eight parts (RPA1/8), and basal main rhizome divided in four (RPB1/4) and eight (RPB1/8) parts. The propagules were sown in a partially shaded (50%) sandy substratum and the resulting plantlets were later transplanted to the field so as to measure their vegetative growth. The best results as to sprouting, fresh and dry leaf and root weight, and petiole length were observed for treatments RPA1/2, RPA1/4, and RPA1/8. The apical portion tissues favored the development of adventitial structures in the propagules thus stimulating the increment of leaf area and petiole length. The sectioning of the main rhizome in two, four, or even eight parts was thus verified to be an economically viable technique for the production of tannia seedlings.
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