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Advances in Horticultural Science
Patharnakh' (PN) (Pyrus pyrifolia Burm. Nakai) and 'Punjab Beauty' (PB) [Pyrus communis L. × Pyru... more Patharnakh' (PN) (Pyrus pyrifolia Burm. Nakai) and 'Punjab Beauty' (PB) [Pyrus communis L. × Pyrus pyrifolia Burm. (Nakai)] are leading lowchill 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 signifi cant positive correlation in 'PN' cultivar. Activities of fruit softening enzymes such as polygalacturonase (PG) and cellulase was enhanced; whereas, pectin methylesterase (PME) was reduced during storage. Fruit firmness was negative ly 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 69 days and 36 days, respectively, during storage at ambient conditions.
Advances in Horticultural Science
Patharnakh' (PN) (Pyrus pyrifolia Burm. Nakai) and 'Punjab Beauty' (PB) [Pyrus communis L. × Pyru... more Patharnakh' (PN) (Pyrus pyrifolia Burm. Nakai) and 'Punjab Beauty' (PB) [Pyrus communis L. × Pyrus pyrifolia Burm. (Nakai)] are leading lowchill 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 signifi cant positive correlation in 'PN' cultivar. Activities of fruit softening enzymes such as polygalacturonase (PG) and cellulase was enhanced; whereas, pectin methylesterase (PME) was reduced during storage. Fruit firmness was negative ly 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 69 days and 36 days, respectively, during storage at ambient conditions.