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Yasutaka Kano, Hiroshi Nakagawa, Masami Sekine, Hideyuki Goto and Akira Sugiura

Head and leaf weight of cabbage plants grown using half the nitrogen fertilizer applied to control plants (hereafter referred to as the half treatment) were markedly less than those obtained for control plants to which the standard amount of nitrogen fertilizer was applied. Sugar content 33 d after sowing (DAS) did not differ between treatments, but glucose and fructose content in the half treatment 82 DAS was higher than that of the control. Although the number of cell layers in cross-section for the leaves from both treatments was ≈20, cells from the half treatment appeared smaller than those of the control. Therefore, it is suggested that the higher sugar content in leaves of cabbage plants grown on media containing less nitrogen fertilizer occurs in response to the smaller cells in the leaves.

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Jun Matsumoto, Hideyuki Goto, Yasutaka Kano, Akira Kikuchi, Hideaki Ueda and Yuta Nakatsubo

To determine the relationship among cell size, acid invertase (AI) activity, sucrose phosphate synthase (SPS) activity, and sucrose accumulation in melon (Cucumis melo L.) during early development [from 6 to 16 days after anthesis (DAA)], fruit were heated at night to a minimum of 20 °C. Cells of heated fruit were larger than those of control fruit at 16 DAA but smaller at 50 DAA. AI activity was lower and SPS activity was higher in heated than in control fruit up to 26 DAA. Sucrose, glucose, and fructose contents at 26 and 50 DAA were higher in heated than in control fruit. Heating caused cells to reach mature size earlier than those of control fruit, and maturity was accompanied by earlier decline in AI activity and an earlier increase in SPS activity that promoted soluble sugar accumulation.