Effects of Ethylene Degreening and Storage Temperature on Coloration and Fruit Quality of ‘Eureka’ Lemon (Citrus limon L. Burm.F. cv. ‘Eureka’ )

• Main Authors: Tsung-Han Lin, 林宗翰
• Other Authors: Ching-Chang Shiesh
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/21875430682731111032

碩士 === 國立中興大學 === 園藝學系所 === 103 === Citrus limon Burm.f., lemon is one of the major fruit tree in Taiwan. Because the production season of lemon in Taiwan mainly in summer time (June to October) the price of lemon increases or decreases very often in a year period.If export the excessive lemon abroad, this problem will be solved.But Taiwan used to have green lemons in the meanwhile the comsumers in other contries near Taiwan most be fond of yellow lemons.If an integrate set of lemon degreening procedure could be established in Taiwan, and which in clues fast, medium and slow speed of lemon degreening, there will be a completely promising future for the lemon export industry in Taiwan. In the experiment of 2014 and 2015, degreening ‘Eureka’ lemon at 25°C and 30°C with 5 ppm ethylene gas. The lemons reach full color in 25°C by 9-10 days; in 30°C by 5-7 days.The fruit quality of lemon have very few changes in 25°C and 30°C. But it takes longer time at 25°C to achive fully yellow which may does harm to fruits because of long period of ethylene treatment. And then the fruit decay and bottom abscission increases.Degreen lemon at 25°C and 30°C in 0,5,10 and 100 ppm ethylene,it takes 5-6 days for lemon to reach full color in 10 ppm ethylene,and treated with 100 ppm 2,4-D liquid before ethylene treatment could reduce fruit bottom abscission rate but the effect is limited.After 5,100 ppm ethylene treatment,storaging the fruits at 13°C for 6-7 weeks which could obtain full yellow fruits.The weight loss will decrease as the storage time prolongs.The fruit titeable acid and firmness of every set at 30°C increases,and it’s good for storage.If wanted to apply this degreening technique on commercial use, 25°C and 30°C with 10 ppm ethylene gas are available,the latter is with better color but it takes 0.5 days longer than the former to reach full color.Seal the fruit in gas tank and degreening at 30°C with 10 ppm ethylene for 5 days,and storage in 20-33°C without MAP(Modified atomosphere Package) for 10 days. The result shows that storaging the fruits in 33°C is with better degreening effect but with serious fruit peel water loss problem.Bagging the fruits with PE bags before storaging in 1°C and 15°C.In 1°C, there are no obvious change in fruit peel color and quality;In 15°C,the fruits get full color in 3 weeks and both of which show no physiological deterioration in fuit.Harvest the fruits at 4.5,5 and 5 months after blooming and then degreening at 25°C with 10 ppm ethylene.It needs 10-11 days for 4.5 months maturity to get full color,and for 5,5.5 months sets which takes 5-7 days to get full color.