STUDIES ON USE OF ELICITORS AND BIO-FORMULATIONS ON SHELF LIFE AND QUALITY OF PAPAYA (Carica papaya L.) FRUITS
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Date
2018-07
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University of Horticultural Sciences, Bagalkot
Abstract
A study entitled “Studies on use of elicitors and bio- formulations on shelf life
and quality of papaya (Carica papaya L.) fruits” in var. Red Lady was carried out at
farmer’s fie ld, Kaladagi Hobli, Bagalkot district and Department of Post-harvest
Technology, College of Horticulture, University of Horticultural Sciences, Bagalkot
during 2017-18.
In the experiment on effect of pre harvest foliar application of elicitors and
bio- formulations under field conditions. Among the treatments, salicylic acid
@ 300 ppm treated fruits showed minimum physiological loss in weight (13.99%),
respiration rate (11.58 ml CO2/ kg/ hr), maximum firmness (4.34 N), sensory quality,
lesser changes in colour values and minimum per cent disease index (34.83%),
whereas, brassinosteroid treated fruits @ 0.1 per cent recorded the maximum total
soluble solids (14.850B) and Pseudomonas fluorescens treatment @ 1x108 cells/ml
recorded the maximum beta carotene content (1.19 mg 100 g-1). Similarly, salicylic
acid @ 300 ppm and brassinosteroid @ 0.1 per cent treated fruits also showed higher
shelf life of 9 days when compared to control fruit (7 days).
In the second experiment on combined effect of pre and post-harvest
application of best treatments (salicylic acid @ 300 ppm, brassinosteroid @ 0.1%,
chitosan @ 2%) of pre harvest experiment and its application on wrapping paper,
chitosan treatment for both fruits and wrapping paper maintained the minimum
respiration rate, physiological loss in weight, maximum firmness, titratable acidity,
sensory quality and lesser changes in colour values. However, salicylic acid treatment
for fruits showed a minimum per cent disease index. Among the wrapping of paper
and treatments, chitosan treated fruits having without wrapping paper and with treated
wrapping paper showed the higher shelf life of 9.80 days and 10.60 days, respectively
at ambient condition when compared to control fruits.
In conclusion, pre harvest application of salicylic acid @ 300 ppm and pre and
post harvest application of chitosan @ 2% enhanced the quality and shelf life of
papaya fruits.