Effects of Bagging on Skin Color and Fruit Quality of Wax Apple (Syzygium samarangenes Merr. et Perry)
Date Issued
2011
Date
2011
Author(s)
Lee, Chih-Pei
Abstract
Wax apple (Syzygium samarangenes Merr.et Perry) can produces fruits all-year-round in Taiwan; however, to enlarge winter fruits and darken the skin color of summer fruits are two major priority issues. Thus, the objective of this study was to evaluated the effect of light permeability and temperature on the synthesis of anthocyanins and fruits weight. The light permeability and temperature was adjusting by bagged the fruits with varieties of bags.
Fruit skin of wax apple may accumulate anthocyanins without light but light may enhence accumulation; however, the light intensity required to produce highest amount of anthocyanins varies among different seasons. In winter, fruits developed in 15%-90% permeability bag had highest anthocyanins content (6.3±0.4μmol•cm-2 ), in 4% permeability bag had 80% of the highest content, and in dark had 50% of the highest content. In spring, the highest content (8.3μmol•cm-2) appeared in the fruits developed under 4%-15% permeability, 52% permeability resulted in 50% decrease from the highest, and fruits developed in the dark accumulated 65% of the highest. Exposing to light through bags of 52% permeability for the dark treated fruits 1 week before harvest increased the anthocyanins content in winter fruits but not spring fruits. The average temperatures of the fruit developing periods of the winter and spring fruits were 22oC and 18 oC; whereas, the light intensities required to obtain highest anthocyanins content were 197-1180μmol•m-2•cm-2 for winter fruits, and 68-257μmol•m-2•cm-2 for spring fruits. Temperature and light intensity may play important roles in skin coloring in wax apple; however, more research is needed to prove.
The effect of temperature on fruit weight was conducted in winter of 2009. Tyvek-foil bag increased fruit developing temperature by 4.4oC than white paper bags, which resulted in increase of fruit length, width, weight, and volume; while switch Tyvek-foil bags to white paper bags at middle stage of fruit developing diminish the increase. The result revealed that he critical period for fruit enlargement was after middle stage of the fruit development. However, the effect of temperature on fruit development was not repeated in experiment of 2011 winter due to severe fruit drop.
Subjects
wax apple
bagging
light intensity
skin color
anthocyanins
fruit weight
Type
thesis
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