Abstract

MEDINA CANO, Clara Inés; MARTINEZ BUSTAMANTE, Enrique; LOBO ARIAS, Mario  and  VARGAS ARCILA, Maria Orfilia. LULO (Solanum quitoense Lam)  BIOMASS PARTITIONING UNDER FULL SUNHINE LIGHT AT THE LOW MOUNTAIN RAIN FOREST OF EAST ANTIOQUIA, COLOMBIA. Rev. Fac. Nac. Agron. Medellín [online]. 2008, vol.61, n.1, pp.4256-4268. ISSN 0304-2847.

An study, with the lulo Solanum quitoense botanical varieties septentrionale, accession 'NM', with thorns, and quitoense, accession 'SV80', thorneless, was carried out at Corpoica's La Selva Research Station, Rionegro, Antioquia, Colombia. The objective was to determine the biomass partitioning for both materials under full sunshine conditions from transplanting up to 364 days after transplanting. The plant dry matter accumulation for both materials adjusted closely to sigmoidal models (P<0.0001) for all the plant organs, with some differences between the studied  populations. Thus, for total dry matter the logarithmic and longitudinal phases were evident for variety septentrionale but not the asymptotic one; in contrast, in quitoense all the model phases were clearly observed. Dry matter partitioning displayed a dynamic differential pattern throughout the ontogenic periods for both materials, with greater dry matter foliage accumulation at the onset of the growing period, followed by an increase in the partitioning to the stems at the beginning of the reproductive period, and stabilization during the productive stage. Also it was observed that the foliar dry matter accumulated during the vegetative period was redistributed, at the productive stage, between leaves, flowers and fruits. Significant allometric relationships were obtained between stem diameter and leaf dry matter, as well as between leaf dry matter and root dry matter.

Keywords : Dry matter; biomass distribution; allocation models; allometry.

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