Vol. 35 No. 3 (2021): Advances in Horticultural Science
Articles

Biochemical changes in pear fruits during storage at ambient conditions

A. Kaur
Department of Biochemistry, Punjab Agricultural University, 141 004 Ludhaiana, Punjab, India
S. Sharma
Department of Biochemistry, Punjab Agricultural University, 141 004 Ludhaiana, Punjab, India
N.P.
Department of Fruit Science, Punjab Agricultural University, 141 004 Ludhiana, Punjab, India
Published August 3, 2021
Keywords
  • Cellulase,
  • minerals,
  • 'Patharnakh',
  • pectinmethlestrase,
  • polygalacturonase,
  • 'Punjab Beauty',
  • quality attributes,
  • ripening physiology,
  • sugars
  • ...More
    Less
How to Cite
Kaur, A., Sharma, S., & Singh, N. (2021). Biochemical changes in pear fruits during storage at ambient conditions. Advances in Horticultural Science, 35(3), 293-303. https://doi.org/10.36253/ahsc-10740

Abstract

‘Patharnakh’ (PN) (Pyrus pyrifolia Burm. Nakai) and ‘Punjab Beauty’ (PB) [Pyrus communis L. × Pyrus pyrifolia Burm. (Nakai)] are leading low-chill pear cultivars of subtropics of India. Diurnal temperature and relative humidity during fruit harvest period is high which considerably affect the shelf life of fruits. Fruits of ‘PN’ and ‘PB’ pear harvested at physiological maturity were stored for 12 days at ambient temperature and effects of storage temperature on physical and qualitative parameters were studied. Both cultivars showed reduction in fruit weight and firmness, reducing sugars, sucrose, starch and pectin content. However, total soluble solids and juice acid content increased during storage. Sucrose synthase activity and sucrose content showed significant positive correlation in ‘PN’ cultivar. Activities of fruit softening enzymes such as polygalacturonase (PG) and cellulase was enhanced; whereas, pectinmethylesterase (PME) was reduced during storage. Fruit firmness was negatively correlated with PG in both the cultivars. In ‘PN’ cultivar, fruit firmness was positively correlated with cellulase and negatively with PME enzyme but reverse trend was observed in ‘PB’ cultivar. Fruit minerals content didn’t show any substantial disparities in both the cultivars during storage. ‘Patharnakh’ and ‘Punjab Beauty’ fruits maintain desirable quality parameters up to 6-9 days and 3-6 days, respectively, during storage at ambient conditions.

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