Effect of Paclobutrazol on Fruit Quality Attributes in Mango (Mangifera indica L.) Cv. Totapuri

Paclobutrazol application restricts vegetative growth while improving flowering and fruiting in mango. In the present study, effect of soil drenching with Paclobutrazol @ 3.0ml m-1 canopy diameter, applied during the 3rd week of August, on fruit quality attributes was investigated in cv. Totapuri. Parameters like fruit weight, total soluble solids (TSS), % acidity, and content of ascorbic acid, carotenoids, lycopene and individual sugars was estimated. Paclobutrazol application increased average fruit weight, TSS and content of ascorbic acid and total carotenoids, and reduced the acidity in fruits compared to fruits in untreated trees. Lycopene content was only marginally influenced by paclobutrazol. In fruits of paclobutrazol treated trees, increase of 23.4% in total sugars, 29.6% in reducing sugars, 77.4% in glucose and 27.8% in sucrose content was recorded over fruits from the untreated trees. Results indicated that, paclobutrazol application improved quality in mango fruit

Chemical Constituents during the Main and Off-Season in Mango (Mangifera indica L.) Cv. Royal Special

Evaluation and quantification of fruit quality parameters like carbohydrates, phenolics, flavonoids, ascorbic acid, titrable acidity, Total Soluble Solids (TSS), carotenoids and lycopene content was done in fruits of mango cv. Royal Special, at ICAR-Indian Institute of Horticultural Research, Bengaluru, India, during the off-season (October, 2012) and main-season (June, 2013), respectively. 'Royal Special' is a typical off-season bearing cultivar, often characterized by multiple flushing and flowering under South Indian conditions. Major phytonutrients such as total sugars, reducing sugars, starch, total carotenoids, lycopene, total phenols, flavonoids, ascorbic acid, TSS, titrable acidity and average fruit yield per plant, were recorded during the off- and main- seasons. Results indicated that fruits from off-season were higher in the major chemical constituents studied compared to the main-season crop, except for fruit yield per plant. This may be attributed to poor competition for nutrients among the developing fruits which act as a sink, besides fluctuating environmental conditions during the off-season, compared to the main-season

Influence of Organic Practices on Growth and Fruit Yield in Papaya Cv. Surya

A field trial on organic practices in papaya cv. Surya was conducted during 2009-2011 with 10 nutrient combinations involving farm yard manure, biofertilizers and VAM along with 100% recommended dose of fertilizers and no manure/ fertilizer treatment. Vegetative parameters were recorded periodically. At 18 months after planting, plant height, plant girth and number of leaves were found to be significant. Results indicated that, crop growth was better with organic treatments compared to no manure/fertilizer treatment. Fruit yield and quality parameters were also recorded. Fruit yield and average fruit weight were found to be significant. Maximum fruit yield of 32kg/plant (80 t/ ha) was recorded under 75% recommended dose of fertilizer applied as farm yard manure+vermicompost, which was significantly superior to that in 100% recommended dose of fertilizer for the 18-month cropping period

Effect of Organic Practices on Fruit Quality in Papaya Cv. Surya

A field experiment was conducted during 2009-10 at Indian Institute of Horticultural Research, Bangalore using papaya cv. 'Surya'. Ten organic nutrient treatments along with recommended dose of fertilizers and control (no manure/fertilizer) were used totaling twelve treatment combinations of FYM, biofertilizers and vermicompost. Fruit quality parameters such as total carotenoids, lycopene, TSS, average fruit weight and ascorbic acid content were analyzed. Among the treatments, application of 50% recommended dose of fertilizers in the form of farm yard manure (FYM) applied as Azospirillum+Phosphate solubilizing bacteria+Mycorrhiza+Vermicompost showed high level of carotenoids, lycopene and low levels of ascorbic acid. TSS and average fruit weight were not affected by various organic nutrient treatments

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Not AvailableIn order to study the role of carbohydrates in the paclobutrazol induced floral initiation in mango (Mangifera indica L.), the carbohydrate contents and the activities of amylase and sucrose metabolizing enzymes were analyzed in the apical buds and leaves of growing shoots at 4 bud developmental stages numerically haracterized as 510 (initiation of bud swelling), 511 (swollen buds), 513 (bud burst) and 515 (panicle emergence) according to standard BBCH scale. The soil drenching treatment of paclobutrazol @ 3.0 ml m-1 canopy diameter to the mango cv. Totapuri resulted in increase in the contents of total soluble sugars, reducing sugars, starch, sucrose, glucose and fructose in the apical buds and leaves, and the increases were greater in apical buds. Both in the paclobutrazol treated and control trees, the contents of total soluble sugar, reducing sugar, sucrose, glucose and fructose showed a progressive increase from 510 to 513 bud developmental stages and declined subsequently. In contrast, leaf starch showed a consistent declining pattern from higher value at 510–515 bud developmental stages. The amylase activity in leaves declined, while the activities of acid invertase (AI), sucrose synthase (SS) and sucrose phosphate synthase (SPS) increased significantly in the apical buds of paclobutrazol treated trees as compared to control, with peak activity witnessed at 513 bud developmental stage. The results indicated that paclobutrazol induced flowering is accompanied by an increase in starch in leaf concomitant with an increase in soluble sugars like sucrose, glucose and fructose in apical buds and inhibition in the amylase activity in association with increase in the activities of AI, SPS and SS in the apical buds.Not Availabl