Effect of photocatalytic reaction of TiO2 on fruit rot fungi of rambutan
P. Jitareerat, A. Uthairatanakij, S. Photchanachai, V. Srilaong
Acta Horticulturae 973: 151-157: 2013.
2013
บทคัดย่อ
The effect of the photocatalytic reaction of TiO2 at 0 (control), 0.1, 1, 5, and 10% on spore germination and mycelial growth of Colletotrichum gloeosporioides, Fusarium sp., and Lasiodiplodia theobromae, the casual agents of rambutan fruit rot disease, was investigated. The results showed that the sensitivity of these three fungi to the photocatalytic reaction of TiO2 varied. TiO2 at 1% was the best concentration to inhibit spore germination of L. theobromae giving significant differences from untreated spores, whereas 1% of TiO2 showed only a small inhibitory effect on C. gloeosporioides and Fusarium sp. Germination However, high concentrations of TiO2 (5 and 10%) induced spore germination of these two fungi. The effect of the photocatalytic reaction of TiO2 on mycelial growth was to retard mycelial growth of all the fungi, and the effect was related to the increase of TiO2 concentration. Under the electron microscope the structure of spores and mycelium cultured in media containing TiO2 at 1% showed that the spores of all the fungi were able to germinate, mycelial structure was normal, and no damage to the cell walls was observed. The results implied that the slow growth of fungal mycelia might be caused by the interference of TiO2 particles during their growth.