Abstract

SIERRA-ESCOBAR, Jorge A.; CASTRO RESTREPO, Dagoberto  and  OSORIO VEGA, Walter. Laurel (Ocotea sp.) mycorrhizal dependence. Colomb. for. [online]. 2009, vol.12, n.1, pp.17-24. ISSN 0120-0739.

A greenhouse experiment was carried out to determine the mycorrhizal dependency of laurel (>Ocotea sp.). In order to do this, a completely randomized experimental design was used, with six treatments in a factorial array of 3x2 and five repetitions. The treatments involved a combination of three Phosphorus (P) levels in soil solution (0.002, 0.02 and 0.2 mg L^-1) and two levels of mycorrhizal inoculation, either inoculated or non-inoculated with Glomus aggregatum Schenck & Smith. The leaf P content as a function of time was used as an output variable. Shoot dry matter, shoot P content, mycorrhizal colonization of roots, and mycorrhizal dependence were measured at harvest. The results indicated that the leaf P content increased significantly when using the mycorrhizal inoculation in laurel at P level 0.2 mg L ^-1, but not in the other P levels, on some of the sampling days. Shoot dry weight and total plant P content did not increase at all levels of soil available P. Mycorrhizal dependency of laurel reached 28%, which allows this species to be classified as moderately dependent on mycorrhiza.

Keywords : mycorrhiza; phosphorus fixation; Ocotea; Micorriza; fixação do fósforo; Ocotea.

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