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Vārānasi, India

Singh A.,Govind Ballabh Pant University of Agriculture & Technology | Singh K.P.,Govind Ballabh Pant University of Agriculture & Technology | Rajwar G.S.,Post University | Singh U.P.,22 Ganesh Dham Colony
Archives of Phytopathology and Plant Protection | Year: 2010

Development of powdery mildew (Podosphaera leucotricha) on five popular cultivars of apple, viz., Scarlet Gala, Golden spur, Mollies Delicious, Red Fuzi and Red Chief was studied to determine incidence-severity relationship. The disease was confined primarily to the vegetative terminal shoots early in the season which also traversed later onto other leaves. Several biochemical changes occur in the trees due to fungal/microbial infection. We studied the qualitative/quantitative changes in phenolic acids in apple-powdery mildew pathosystems. Scarlet Gala and Red Chief are very rich in phenolic acids, and had shown resistances to the pathogen but those with low amount of phenolic acids, viz., Golden spur, Mollies Delicious, and Red Fuzi, were highly susceptible. Thus, the quantity of phenolic acids (secondary metabolites) has been taken as a biochemical parameter in screening apple cultivars for resistance/susceptibility against powdery mildew of apple. © 2010 Taylor & Francis. Source


Singh U.P.,22 Ganesh Dham Colony | Maurya S.,ICAR Research Complex for Eastern Region | Singh M.,Banaras Hindu University | Singh A.,22 Ganesh Dham Colony
Mediterranean Journal of Nutrition and Metabolism | Year: 2013

Jamun (Syzygium cumini), which belongs to the family Myrtaceae, is an important indigenous minor fruit of commercial value. S. cumini fruit possesses considerable nutritive value because it is a rich source of carbohydrates, proteins, iron, calcium, minerals, vitamins as well as phenolic acids. Leaves are rich in phenolic acids in which tannic acid was maximum followed by caffeic acid. Tannic acid is also maximum in ripe fruit epicarp, seeds and mesocarp as compared to unripe fruit epicarp. Caffeic and cinnamic acids are also present in ripe fruit seeds. Other phenolic acids are present in traces. Tannic acid was maximum in the seeds of unripe fruits followed by chlorogenic and gallic acids and some other phenolic acids. The therapeutic properties of these phenolic acids are discussed. © 2013 Springer-Verlag Italia. Source


Singh U.,22 Ganesh Dham Colony | Singh R.,22 Ganesh Dham Colony | Singh A.,Banaras Hindu University | Singh H.,Banaras Hindu University
Journal of Plant Protection Research | Year: 2010

Sclerotium rolfsii is one of the devastating soil-borne phytopathogens which causes severe loss at the time of seedling development. It also causes leaf spots in several crops and wild plants. Petri plates, containing potato dextrose agar medium, were inoculated with S. rolfsii. Two-third area of three, 50% area of three and 100% area of other three plates were sealed with cellophane tape. The other three plates were not sealed. All the plates were incubated at 27±2°C. Two sets of such plates were prepared. One set was incubated in light whereas the other set in the dark. There was no significant difference in mycelial growth and number of sclerotia among them but significant difference was observed when compared to the control, i.e. the plates which were not sealed. Sclerotium and basidiospore formation were directly influenced by air as completely sealed plates failed to produce sclerotia and basidiospores. Basidiospores were produced abundantly in the light and in the dark conditions in unsealed plates only on Cyperus rotundus rhizome meal agar medium. Source

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