林棟樑 王仕賢 黃賢良
Studies on Maturity and Storage Quality of Winter Melon (Cucumis melo var. inodorous)
Lin, D. L., S. S. Wang and S. L. Hwang
Winter melons of “Tainan Test Cross No. 4”, “Honey World” and “Jade Green” were used in this study. Seedlings were planted under PE sheet tunnels. Fruit maturity and storage at various temperatures were investigated.
A simple sigmoid growth curve of fruit development is exhibited by all the three cultivars. Fruit size did not increase 35 days after anthesis. The internal ethylene concentration of “Jade Green“ fruit reached above 3 ppm at 38 days after anthesis. Fruit firmness of “Tainan Test Cross No. 4” was the highest with a significant decrease at 32 to 35 days after anthesis. Total soluble solids (TTS) reached above 11 brix at 47 days after anthesis. Surface color of fruit turned from dark green to slight yellow green when ripened. “Jade Green” fruit ripen earlier, which was ripen at 45 days after anthesis; while “Honey World” and “Tainan Test Cross No. 4” require 50 days.
Muskmelon fruits stored at 20℃ (RH 85~90%) for 1 to 2 weeks exhibits an increase in internal ethylene concentration and fruit softening. For the fruit stored for 3 weeks at 12℃, internal ethylene concentration remained at low level and fruit firmness maintained at hard. Fruits harvested at 45 days after anthesis had higher firmness then those harvested at 50 days after anthesis. TTS was not significantly affected during storage. Fruit of “Tainan Test Cross No. 4” and “Honey World”, stored at 7℃ for 2 weeks showed chilling injury symptoms with sunken surface and brown spots. While the “Jade Green” did not show any chilling injury symptom after stored at 7℃ for 3 weeks. It is suggested that “Tainan Test Cress No. 4” and “Honey World” should be harvested at 45 days or 50 days after anthesis and stored at 12℃ with an approximate storage life of 3 weeks.
Keywords: growth curve, internal ethylene concentration, firmness, total soluble solid, chilling injury.
Accepted for publication: November 17, 1992.