Article

Nitrogênio e fósforo no crescimento de plantas de ginseng brasileiro [Pfaffia glomerata(Spreng.) Pedersen] cultivadas in vitro

Ciência Rural (Impact Factor: 0.4). 01/2003; DOI: 10.1590/S0103-84782003000100009
Source: DOAJ

ABSTRACT O ginseng brasileiro [Pfaffia glomerata (Spreng.) Pedersen] apresenta propriedades medicinais marcantes e, por isso, atualmente, é largamente explorado de forma extrativista, tanto por parte dos coletores de ervas como pela indústria farmacêutica. Este trabalho objetivou caracterizar o efeito da variação isolada da concentração de N e P do meio MS no crescimento de plantas de P. glomerata cultivadas in vitro. Segmentos nodais de 1,0cm de comprimento e sem folhas, de plantas já estabelecidas in vitro, foram cultivados em meio MS contendo cinco concentrações (0, 25, 50, 100 e 150% da concentração padrão do meio de cultura MS) de nitrogênio ou fósforo. Aos 15 dias após a inoculação (DAI), o número de raízes e o percentual de enraizamento são maiores na concentração de N e P equivalentes a 50% daquela do meio de cultura MS. Aos 40 DAI, o crescimento em altura das brotações, número de segmentos nodais, índice de área foliar, número de folhas, matéria seca de raízes, da parte aérea e total da planta é maior na concentração de N e P, em média, próxima a 80% daquela do meio de cultura MS.

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