ナルトミカンの生理障害 (果皮黄斑症) の発生に及ぼす採収時期, 貯蔵温度及び貯蔵前の加温処理の影響

Abstract

Effects of harvesting time, storage temperature and pre-storage warming were studied in relation to the subsequent development of ‘Rind yellow spot’ of Naruto (Citrus medioglobosa Hort. ex Tanaka), a physiological rind disorder during storage.1. When the fruit was harvested before full color developed, no incidence of the disorder was found during storage, but when harvested after that, the disorder became increasingly severe.2. The disorder occurred much more severely on fruit stored at 2_??_10°C than at 15 °C. The disorder developed rapidly on fruit stored at 10°C during the first half of the storage period, while at 2°C storage it increased remarkably only in the second half.3. Warming treatment at 25°C or 35°C before cold storage reduced the incidence of the disorder. Although the effect of treatment for 6 hours was slight, a marked effect was observed with treatment for 24 hours. Electrolyte leakage from rind disks was reduced when the fruit was warmed before cold storage.4. It is suggested that the disorder appears to be a kind of chilling injury, and that its development is closely associated with storage temperature and can be prevented by pre-storage warming treatment.