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Amin M.,Institute of Horticultural science | Malik A.U.,Institute of Horticultural science | Khan A.S.,University of Agriculture at Faisalabad | Javed N.,University of Agriculture at Faisalabad
International Journal of Agriculture and Biology | Year: 2011

Mango fruit quality, marketability and shelflife are adversely affected by postharvest disease development. The fungicides and plant activators suppress the disease development in fruits and vegetables. These studies were targeted to evaluate the potential of pre and postharvest fungicidal applications and on-tree foliar spray of a plant activator viz. a viz. salicylic acid for postharvest disease management in two commercial mango cultivars (Sindhri & Samar Bahisht Chaunsa) of Pakistan. Alternaria alternata (49.3% in Sindhri; 58.5% in Chaunsa), Phomopsis mangiferae (20.0% in Sindhri; 18.2% in Chaunsa) and Botryodiplodia sp. (3.9% in Sindhri; 2.7% in Chaunsa) were found to be associated with mango fruit stem end rot (SER) under agro-ecological conditions of Punjab, Pakistan. Penecillium sp. and Aspergillus sp. (A. niger & A. flavus) were identified to be associated with secondary infections in the diseased mango fruit tissues. Among the postharvest diseases, fruit side rots were predominant (5-10% affected area) followed by stem end and distal end rots (<5% affected area). Postharvest fungicidal treatments gave significantly better disease control as compared to preharvest applications. Postharvest hot water (52°C; 5min) application of Tecto (1.8 mL/L) a.i. Thiabendazole (TBZ) individually and in combination with Sportak (0.5 mL/L) a.i. Prochloraz (tank mix) resulted in significantly lower postharvest disease development than other pre and postharvest treatments. Pre and postharvest fungicidal applications significantly affected fruit peel color development. Relatively better color development was observed in the fruit subjected to postharvest fungicidal treatments as compared to preharvest applications. Non significant effect of both pre and postharvest fungicidal treatments was observed on biochemical quality attributes (TSS & titratable acidity). On tree foliar sprays of salicylic acid (250, 500 & 1000 μM) in cvs. Sindhri and Samar Bahisht Chaunsa at the time of panicle pushing/flower opening, fruit set and stone hardening could not perform well against postharvest disease development. © 2011 Friends Science Publishers. Source


Afzal I.,Faisalabad | Afzal I.,University of Adelaide | Mukhtar K.,Institute of Horticultural science | Qasim M.,Institute of Horticultural science | And 3 more authors.
International Agrophysics | Year: 2012

The effects of magnetic field treatments of French marigold seeds on germination, early seedling growth and biochemical changes of seedlings were studied under controlled conditions. For this purpose, seeds were exposed to five different magnetic seed treatments for 3 min each. Most of seed treatments resulted in improved germination speed and spread, root and shoot length, seed soluble sugars and α-amylase activity. Magnetic seed treatment with 100 mT maximally improved germination, seedling vigour and starch metabolism as compared to control and other seed treatments. In emergence experiment, higher emergence percentage (4-fold), emergence index (5-fold) and vigorous seedling growth were obtained in seeds treated with 100 mT. Overall, the enhancement of marigold seeds by magnetic seed treatment with 100 mT could be related to enhanced starch metabolism. The results suggest that magnetic field treatments of French marigold seeds have the potential to enhance germination, early growth and biochemical parameters of seedlings. © 2012 Institute of Agrophysics. Copyright © 2012 Institute of Agrophysics, Polish Academy of Sciences. Source


Amjad M.,Institute of Horticultural science | Afzal I.,University of Agriculture at Faisalabad | Ahmed T.,Institute of Horticultural science | Iqbal Q.,Institute of Horticultural science | Iqbal J.,Ayub Agriculture Research Institute
Journal of Animal and Plant Sciences | Year: 2013

The study was carried out to investigate the effects of hormonal priming on germination and seedling growth of tomato seeds. Priming was done by exposing seeds of two tomato cultivars 'Nagina' and 'Pakit' to aerated solutions of (Cytokinins) 10, 50 and 100 ppm BAP and kinetin for 24 h. The performance of primed and non primed seeds was evaluated during germination and emergence tests under controlled conditions by using completely randomized design with three replications. Seed priming with 10 ppm kinetin increased final germination percentage, germination index, shoot length and seedling fresh weight of both tomato cultivars as compared to all other presowing seed treatments including control. Seeds of both tomato cultivars primed with 10 ppm kinetin for 24 h significantly reduced the time taken to 50% emergence and mean emergence, increased final seedling emergence percentage and seedling growth. Results indicated that cytokinins priming with varying concentrations of BAP and kinetin improved germination potential and seedling establishment of both cultivars. Maximum improvement was recorded in seeds primed with 10 ppm kinetin. The better performance of primed seeds may be due to lower electrical conductivity (EC) of seed leachates. Source

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