Energy-Saving Night Temperature Regime for Satsuma Mandarins (<i>Citrus unshiu</i> Marc.) Grown in a Plastic House with Heating. II. Effect of Night Temperature on Fruit Water and Carbon Balances

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  • TYANO Taku
    Fruit Tree Group, Oita Prefectural Agriculture, Forestry and Fisheries Research Center Faculty of Agriculture, Kyushu University
  • MATSUBARA Kimiaki
    Fruit Tree Group, Oita Prefectural Agriculture, Forestry and Fisheries Research Center
  • SHIMOOKA Moe
    Fruit Tree Group, Oita Prefectural Agriculture, Forestry and Fisheries Research Center
  • TAMANOI Akira
    Fruit Tree Group, Oita Prefectural Agriculture, Forestry and Fisheries Research Center
  • NARAHARA Minoru
    Fruit Tree Group, Oita Prefectural Agriculture, Forestry and Fisheries Research Center
  • KAWANO Masatoshi
    Fruit Tree Group, Oita Prefectural Agriculture, Forestry and Fisheries Research Center
  • ITO Shunichiro
    Fruit Tree Group, Oita Prefectural Agriculture, Forestry and Fisheries Research Center
  • SETOYAMA Shuji
    Faculty of Agriculture, Kyushu University
  • YASUNAGA Eriko
    Institute for Sustainable Agro-ecosystem Services, the University of Tokyo
  • ARAKI Takuya
    Faculty of Agriculture, Ehime University
  • KITANO Masaharu
    Faculty of Agriculture, Kyushu University

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Other Title
  • Energy-Saving Night Temperature Regime for Satsuma Mandarins (Citrus unshiu Marc.) Grown in a Plastic House with Heating(2)Effect of Night Temperature on Fruit Water and Carbon Balances
  • Energy-Saving Night Temperature Regime for Satsuma Mandarins (Citrus unshiu Marc.) Grown in a Plastic House with Heating. II. Effect of Night Temperature on Fruit Water and Carbon Balances

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Description

In order to clarify the effect of nighttime temperatures on fruit development of Satsuma mandarin, we examined the fruit water and carbon balances using the 13C tracer method and the roles of phloem and xylem transports for fruit growth under moderate night temperatures (MN, set at 23°C) and low night temperatures (LN, set at 13°C). The average predawn xylem water potentials were −0.79±0.04 MPa under MN and −0.77±0.03 MPa under LN. Fruit growth used 86% of pedicel sap flux toward the fruit, while transpiratory water losses from the fruit surface were 14% of pedicel sap flux under both MN and LN. The daytime integrated xylem sap flux was negative, but it was positive in the nighttime. The integrated phloem sap flux (ΣJPhlo) and the difference in ΣJPhlo between MN and LN were only 6–10% and 4% of the total sap accumulated in the fruit, respectively. Integrated fruit photosynthesis and integrated CO2 efflux from the fruit surface were 7–8% and 22–23% of the total carbon supply toward the fruit, respectively. This indicates that carbon translocation from leaves to fruit via the phloem of the stem is the main source of carbon for the fruit.

Journal

  • Environment Control in Biology

    Environment Control in Biology 52 (3), 167-173, 2014

    Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

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