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Articles by Yusuke Kusugi
Total Records ( 1 ) for Yusuke Kusugi
  Bimal Kumar Pramanik , Toshiyuki Matsui , Haruo Suzuki , Yusuke Kusugi and Matsuzaki Tomohiro
  This study investigated the seasonal fluctuations in invertase, sucrose synthase (SS) and sucrose phosphate synthase (SPS) activities and sugar and organic acid contents in the florets and branchlets of two broccoli cultivars ‘Hartland’ and ‘Sairin’ harvested from October to April. In both, cultivars and portions, invertase (soluble and cell wall-bound fraction) and SS activities were high in October thereafter decreasing until January and once again gradually increasing up to April. In both cultivars, there was no specific change in SPS activity throughout the harvest season but the activity was high in January. Organic acids (malic and citric) and sugar (specially, sucrose) concentrations increased from October to a maximum in January and again decreased up to April. However, no significant change was observed in glucose and fructose. There was a highly significant negative correlation observed between invertase and SS activities and sucrose content in the florets and branchlets of both cultivars. ‘Sairin’ showed higher invertase, SS and SPS activities in both florets and branchlets than ‘Hartland’.
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