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LAWANDE, Dr.K. E | Desai, Dr.B.B | Kaulgud, Prof.S.N | kadam, Dr.S.S
Mahatma Phule Krishi Vidyapeeth, Rahuri - 413 722

The present investigation entitled, "Effects of varieties, stage of harvest and bahar treatments on internal breakdown of pomegranate {Punica granatum L.) fruits", was conducted at the Research Orchard of All India Co-ordinated Research Project on Arid Zone fruits, Department of Horticulture, Central Campus, Mahatma Phule Krishi Vidyapeeth, Rahuri, Dist. Ahmednagar during Mrig bahar, 1995 and Arabia bahar, 1996 on pomegranate cultivars viz., G-137, Gulsha Red, Jalore Seedless and Mridula at six different stages of fruit development. The disorder in the pomegranate fruit i.e. blackening (malady/internal breakdown) of arils manifests by degradation of aril colour, softening of arils followed by shrivelling and off-flavour at advanced stages. The malady was noticed in all the cultivars and in both the bahars i.e. Mrig bahar, 1995 and Ambia bahar, 1996. The malady in G-137 . „ was videnced at 105 days during Mrig bahar, 1995 and Ambia bahar, 1996. The malady in Mridula was evidenced at 120 days after fruit set during Mrig bahar, 1995. The cultivar Jalore Seedless and Mridula showed the malady at 135 days after fruit set during Ambia bahar, 1996 and that of in Gulsha Red it was at 150 days after fruit set. There were no noticeable differences in the colour of skin and appearance of healthy and affected fruits. There was no any difference in diameter, weight and volume of healthy and affected fruits of all the cultivars in the present investigation. The marked differences between colour of arils of healthy and affected fruits was observed during different growth and development stages of fruit. Initially the colour of healthy arils from healthy fruits was white with pink tinge, creamy white, red, it later on changed and colour of affected arils became brownish to black, pinkish with brown to black, brown to black as per the intensity of blackening in different cultivars. With the advancement in maturity of fruit, the percentage of affected fruits increased. There was difference in percentage of affected arils intensity at different stages of maturity of pomegranate fruits. Intensity of blackening of arils in all the cultivars was higher during Ambia bahar, 1996 than Mrig bahar, 1995. The fruits of Gulsha Red showed minimum incidence (20 and 40 %) and intensity (10 and 15 %) at 150 and 165 days during Ambia Jbahar, 1996. The reduction in the TSS, reducing and total sugars, ascorbic acid and calcium contents and increase in the contents of non-reducing sugars, tannins, boron and also increase in enzyme activities of polyphenol oxidase and peroxidase was observed in the affected arils as compared to those of the healthy arils from the affected as well as healthy fruits. No definite trend was observed as regards to iron and copper content in affected arils. There may be possibility of pathological reason as different fungi were isolated from affected arils and affected pulp. The malady of internal breakdown in the pomegranate is a complex phenomenon and appears to be governed by various factors like genetic, season, imbalance of mineral nutrition, increase in enzymatic activities, temperature, pathological as well as the combined effects of all these parameters.


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