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摘要
O objetivo deste trabalho foi avaliar o efeito da aplica o de diferentes concentra es de um an芍logo de brassinoster車ide (BIOBRAS 每 16) e de dois substratos sobre o crescimento de mudas micropropagadas do abacaxizeiro ＆Imperial＊. O experimento foi conduzido em DBC, em esquema fatorial 2 x 5 x 4, no qual foram avaliadas cincoconcentra es do BIOBRAS - 16 (0; 0,1; 0,3; 0,5 e 1 mg L-1), dois tipos de substratos e quatro 谷pocas de amostragem (60, 90, 120 e 150 dias ap車s transplantio). Os substratos utilizados foram o Plantmax e outro substrato obtido pela compostagem de uma mistura entre o baga o-de-cana e torta de filtro (BT). As plantulas foram transplantadas para tubetes c nicos em casa-de-vegeta o equipada com nebulizadores intermitentes. As plantas cultivadas no substrato BT e pulverizadas com 0,1 mg L-1 do BIOBRAS - 16 apresentaram maior crescimento da parte a谷rea, com maior n迆mero de folhas, diametro de roseta, largurade folha, massa fresca e massa seca, aos 150 dias ap車s transplantio. Nas plantas cultivadas no substrato BT as pulveriza es com o BIOBRAS-16 a 0,1 mg L-1 proporcionaram ac迆mulo de mat谷ria seca 2,8 vezes superior ao valor da testemunha cultivada no substrato Plantmax . A massa fresca e seca de ra赤zes foram superiores no substrato Plantmax em rela o ao BT, nas 迆ltimas 谷pocas de amostragem. This work aimed to evaluate the effects of different concentrations of a brassinoesteroid analogue (BIOBRAS-16) and two substrates on the growth of micropropagated seedlings of ＆Imperial＊ pineapple. A randomized block design was used in a 2 x 5 x 4 factorial scheme, evaluating five concentrations of BIOBRAS-16 (0; 0.1; 0.3; 0.5and 1 mg L-1), two types of substrates and four sampling periods (60, 90, 120 and 150 day safter planting). The substrates used were Plantmax and another obtained from a mix of composting sugar-cane bagasse and filter cake (CC). The seedlings were transplanted tosmall conic tubes and allocated in a greenhouse equipped with an intermittent mist. The plants cultivated in CC substrate and sprayed with 0.1 mg L-1 of BIOBRAS-16 showed higher growth of shoots with greater numbers of leaves, rosette diameter, leaf width, freshand dry matter production at 150 days after planting. The plants that were cultivated on CC substrate and sprayed with BIOBRAS-16 at a 0.1 mg L-1 produced 2.8 times more dry matter than the control cultivated in Plantmax substrate. The fresh and dry matter of roots were superior in Plantmax when compared to CC at late sampling periods.
