Effects of autumn treatment with a mixture of gibberellin and prohydrojasmon spray and postharvest blue LED irradiation on fruit decay in satsuma mandarin fruit
2017
Yamaga, I. (Shizuoka Prefectural Agriculture and Forestry Research Institute Fruit Tree Research Center, Shizuoka (Japan)) | Furuya, M.
We investigated the effects of autumn treatment with a mixture of gibberellin and prohydrojasmon (GP; 3.3 :25 ppm) spray and postharvest blue light-emitting diode (LED) irradiation on storage diseases and chilling injury in satsuma mandarin fruits. Trees were treated with GP three months before harvest. Harvested fruits were irradiated with blue LEDs at a maximum emission wavelength of 465 nm and photon flux of 10 micromol./square m./s for 92 days at 8degC. The blue LED irradiation during storage significantly reduced storage diseases (blue mold, green mold, stem end rot, and black rot), chilling injury, and total decay rate from 63 until 92 days of storage. GP treatment alone did not inhibit the total fruit decay rate. Fruits treated with GP and postharvest blue LED irradiation had a higher titratable acid content than that in non-treated fruits after storage. In contrast, these treatments did not affect the sugar content of fruit. These results indicate that blue LED irradiation in actual storage environments was able to reduce the decay of mandarin fruit, with or without GP treatment.
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