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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    ABSTRACT: This study aimed to establish a protocol for in vitro propagation of two accessions (Ac) of Pfaffia glomerata (Ac 4 and Ac 13) and to evaluate the effect of different carbon sources on the production of 20-hydroxyecdysone (20E) in leaves and roots. For the assessment of axillary shoot proliferation in vitro, nodal segments were inoculated onto Murashige and Skoog (MS) medium supplemented with 2.22 mu M 6-benzyladenine and 2.68 mu M alpha-naphthaleneacetic acid and carbon sources (glucose or sucrose) at varying concentrations (0.1, 0.2, or 0.3 M). To assess the in vitro production of 20E, nodal segments were inoculated into MagentaA (R) containers containing MS medium with different carbon sources (glucose, sucrose, or glucose + sucrose at 0.1 or 0.2 M) and placed in plastic bags with bacterial filters. Both experiments were composed of five repetitions for each treatment and analyzed after 30 d of culture. Multiple shoot formations were genotype-dependent when segments were cultivated on a medium supplemented with glucose or sucrose at 0.1 M, yielding 35 and 43 shoots per explant for Ac 4 and 4.4 and 2.8 shoots per explant for Ac 13, respectively. For the 20E content, significant effects were also observed among accessions and carbon sources. Ac 13 had the highest average 20E levels for both roots and leaves. Under the experimental conditions, Ac 4 had more favorable characteristics for large-scale multiplication than Ac 13, and glucose at 0.2 M was the best carbon source for the cultivation of Pfaffia, both for producing multiple shoots and for in vitro 20E production. This is the first report using a combination of auxin and cytokinin to enable effective Pfaffia in vitro axillary shoot proliferation from nodal explants.
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    ABSTRACT: In vitro growth in different culture media: evaluation of the hybrid Brassavola perrinii Lindl. x Cattleya loddigesii Lindl. The in vitro culture is an important method for propagation of commercial orchid species. The objective of the present paper is to study the in vitro development of Brassavola perrinii Lindl. x Cattleya loddigesii Lindl. using as parameters for evaluation of ½ MS culture media, Hyponex® and Kristalon laranja®. After 180 days of culture, it was inferred that the most efficient media culture for the germination and development of seeds was Kristalon laranja.
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    ABSTRACT: Pfaffia glomerata (Spreng.) Pedersen, known as brazilian ginseng, is an extensively used plant in folk medicine due to its phytotherapic characteristics. This work aimed to determine the best combination of sucrose (30, 45 and 60 g L-1) and nitrogen (50, 75, 100 and 125% of the strength of MS medium) on micropropagation of P. glomerata. In 30 days of cultivation, sucrose ranging from 40 to 45g L-1 and nitrogen at 50% increased the height and the number of nodes. The number of shoots was greater at concentration of 55g L-1 sucrose combined with 70% N. The dry matter of roots, aerial parts, and of the whole seedling was increased on 50% N and 45g L-1 sucrose. Altogether the halved concentration of nitrogen and the increased concentration of sucrose to 45g L-1 increase the height, the number of nodes and the shoots as well as biomass production improved due to an enhancemednt of carbon use.
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