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Comparison of Free Sugar Content and Related Enzyme Activities on Different Parts of 'Changhowon Hwangdo' Peach Fruit  

Kim, Sung-Jong (National Institute of Horticultural & Herbal Science, Rural Development Administration)
Park, Hye-Young (National Academy of Agricultural Science, Rural Development Administration)
Publication Information
Horticultural Science & Technology / v.28, no.3, 2010 , pp. 387-393 More about this Journal
Abstract
The free sugar content and related enzymes of four different parts, inner, outer, stylar end and stem end, of 'Changhowon Hwangdo' peach ($Prunus$ $persica$, L. Batsch) fruit were compared from August to September in 2006, i.e., from 120 to 150 days after full bloom (DAFB). The soluble solids content (SSC) of stylar end was the highest among the four fruit parts at 150 DAFB. Changes of free sugar content were similar to that of SSC in the four parts. The starch content at the stylar end was the highest at 120 DAFB, while all the other parts showed low starch contents at 150 DAFB. The free sugar composition of peach changed during fruit development. The sucrose was low at 120 DAFB and increased gradually in all parts of peach fruit. On the contrary glucose, fructose and sorbitol decreased with fruit development. The free sugar contents and related enzymes activities were investigated during fruit development. The rapid increase of sucrose contents during fruit development was more affected by sucrose synthase than sucrose phosphate synthase. Activity of SS in the four fruit parts increased continuously over the fruit development period, but activity of acid invertase showed a downward trend. This study found that the free sugar content was affected by enzyme activity for the synthesis or the cleavage. However, it was very difficult to explain sugar accumulation of peach segments with related-enzymes.
Keywords
acid invertase; soluble solids content; sucrose synthase; sugar composition;
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