Cart and rack development with a blue LED irradiation source for citrus fruit storage and the effects on the decay of satsuma mandarin 'Jutarou unshu' fruit treated with GP
2020
Yamaga, I. (Fruit Tree Research Center/Shizuoka Res. Inst. Agric. (Japan)) | Yoshikawa, K.
Major post-harvest citrus pathogens cause severe economic loses during storage. Long-term storage has become more difficult because of global warming, which has made rind puffing of mandarin fruits increasingly common. Puffy fruits are frequently damaged during harvest, transport, and storage; whereby, they can be easily infected by fungi, and thus, quickly decay. Herein, we investigated the mitigating effects of blue light-emitting diode (LED) irradiation, using the cart and rack method, on fruit decay in satsuma mandarin (Citrus unshiu Marc.) 'Jutarou unshu' fruit after harvesting. We examined a storage room (13.6 square m) equipped with cooling facilities in Numazu city, Nishiuraenashi. The fruits, which were treated with a mixture of gibberellin and prohydrojasmon (GP; 2 ppm: 25 ppm) spray three months before harvest, were stored using the cart and rack method with a blue LED irradiation source. Then, harvested fruits were irradiated with a tape LED at a maximum emission wavelength of 465 nm for 75 days at 6-7 ℃. After storage, the fruits treated with GP and post-harvest blue LED irradiation had a lower decay rate and rind puffing index than that of the control fruits. In addition, compared to the non-irradiated fruits, the blue LED irradiation during storage significantly reduced the blue and green mold of the treated fruits. In contrast, these treatments did not affect the sugar and titratable acid contents of the fruits. These results show that blue LED irradiation using the cart and rack method in actual storage environments could reduce the decay and rind puffing of mandarin fruit treated with GP.
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