Coloration of 'Irwin' mango fruit affected by ultra violet cut-off film under plastic house conditions.
Sasaki K., Utsunomiya N.
Author Affiliation: Experimental Farm of Kinki University, Yuasa, Wakayama 643-0004, Japan.
Horticultural Research (Japan) 1 : 191-194
Abstract : The effect of ultraviolet cut-off film on the coloration of fruits was investigated to clarify the role of ultraviolet rays on red coloration in 'Irwin' mango. One group of the fruits was bagged with transparent ultraviolet cut-off film and another group of fruits was exposed to natural light on the trees grown in a plastic house. The film cut off 310-400 nm rays and greatly reduced the dose of 220-300 nm and 360-480 nm rays. When fruits were exposed to high light intensity, bagging did not affect the coloration of fruits. High light intensity, more than 10?000 lx, increased the degree of red coloration compared with that under low light intensity in both bagged and control fruits. Definite occurrence of red coloration made the fruit skin more vivid. Bagging decreased the total soluble solids in the juice of ripened fruit. These results indicate that ultraviolet ray is not necessary for red coloration of 'Irwin' mango fruit, and the coloration of fruit may be improved with high light intensity.