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Effects of Deficit Irrigation on the Reduction of Green Shoulder Fruits in Fresh Tomato  

Kang, Nam-Jun (Protected Horticulture Experiment Station, NHRI, RDA)
Cho, Myeong-Whan (Protected Horticulture Experiment Station, NHRI, RDA)
Choi, Young-Hah (Protected Horticulture Experiment Station, NHRI, RDA)
Publication Information
Journal of Bio-Environment Control / v.16, no.3, 2007 , pp. 186-193 More about this Journal
Abstract
Effects of deficit irrigation by different soil moisture-based water potential on the reduction of green shoulder fruits in fresh tomato were investigated. Deficit irrigation with -30 kPa treatment significantly reduced green shoulder fruit by 53.7% compared to the -15 kPa treatment. The total concentrations of potassium in levels of whole fruit was not different between normal red fruit (NRF) and green shoulder fruit (GSF). However, the concentrations of potassium in distal part of GSF lower than that of a basal part of GSF Total soluble sugar contents in NRF and GSF were increased during the maturation periods. Contents of starch in NRF and distal part of GSF were decreased during the maturation periods. However, contents of starch in basal part of GSF was not change during the maturation periods. Activity of sucrose phosphate synthase was higher in NRF than that of GSF. Activity of acid invertase in NRF and GSF decreased rapidly during the maturation periods. Activity of acid invertase was significantly different in distal and basal part of GSF. Total activities of peroxidase and alcohol dehydrogenase in NRF were higher than that of GSF.
Keywords
ADH; deficit irrigation; green shoulder fruit; invertase; POD; tomato; total soluble solids;
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