Resumen

MEDINA, Isabel; RODES, Rosa; DE LA FUENTE, E  y  MATEKAIRE, T. RELACIÓN DE LA SACAROSA FOSFATO SINTASA E INVERTASAS CON EL MOMENTO DE MADURACIÓN EN DOS CULTIVARES DE CAÑA DE AZÚCAR. cultrop [online]. 2010, vol.31, n.3, pp. 00-00. ISSN 0258-5936.

The determinant factors for the sucrose accumulation in sugarcane (Saccharum spp. hybrids), have not been totally decoded yet; however, they are essentials for improving the sugar capacities of varieties at the appropriate time for harvest. Two Cuban sugarcane cultivars, C 1051-73, as early, and My 5514, as late ripening genotypes, were used in this work. The biomass and sucrose accumulation capacity, net photosynthesis, dark respiration and the specific activity of sucrose metabolism enzymes, Soluble Acid Invertase (SAI) and Sucrose Phosphate Synthase (SPS), were studied in two stages close to ripening time. The varieties were significantly different in the net photosynthesis at 1 400 and 2 427 μmol photons.m-2.s-1 of photonic flux densities and sucrose concentration. A highly significant lineal relation was found between sucrose levels and the difference of SPS and SAI in the varieties analyzed (r2= 0.82, p≤0.001). The highest values of both, sucrose concentration and SPS-SAI, occurred before in the early-ripening variety, so the difference between these enzymatic activities could be used as a biochemical marker of ripening.

Palabras clave : sugarcane (Saccharum spp. hybrids); sucrose; ripening; soluble acid invertase; sucrose phosphate synthase.

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