Effects of growth regulations on the ripening of carabao mangoes sprayed with ethephon before harvest

Date

4-1983

Degree

Bachelor of Science in Agriculture

Major Course

Major in Horticulture

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

D. B. Mendoza

Abstract

The effects of growth regulator's on the respiration, ethylene production, color development, total soluble solids (TSS) and titratable acidity (TA) of 'Carabao' mangoes were studied. The trees were induced to flower with KNO3 and sprayed with 250 ppm ethephon solution one month before normal harvest. The fruits were harvested 126 days from flower induction. They were dipped in varying concentrations of napthaleneacetic acid (NAA), benzyl adenine (BA) and gibberellic acid (GA3) for five minutes and stored at 20C.

Higher respiration rates were observed on fruits treated with 500 ppm NAA, 100 and 200 ppm BA, 250 and 1250 ppm GA3. Fruits treated with 50 and 100 ppm naa, 20 ppm BA and 50 ppm GA3 had lower carbon dioxide production than the control. All treatments delayed the climacteric rise in respiration.

Ethylene production was highest at 50 ppm NAA. It was also observed that 100 ppm NAA, 200 ppm BA, 250 and 1250 ppm GA3 increased ethylene production compared to the control. Low ethylene production was exhibited by fruits treated with 20 and 100 ppm BA and 50 ppm GA3.

All growth regulators slowed down rate of color development. No significant effect was observed on TSS and TA content except for 250 ppm GA3 which had significantly lower TA content of treated fruits.

Basing on these results, the apparent benefit from postharvest application of growth regulators is around the region of 4 days from harvest. Within this period, ethephon sprayed fruits dipped in appropriate concentration of growth regulators are greener and have not attained the climacteric peak in respiration.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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