Relation of sucrose phosphate synthase and invertases with ripening time in two sugarcane varieties
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Abstract
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.
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