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Articles by Mohd. Rajik
Total Records ( 2 ) for Mohd. Rajik
  Kahkashan Arzoo , Samir Kumar Biswas and Mohd. Rajik
  The potentiality of different plant extracts like bark of Eucalyptus lanceolotus and Terminalia arjuna, tubers of Cyperus rotundus, leaves of Withania somnifera, Azadirachta indica, Datura stramonium, Acacia arabica, Cymbopogon flexuosus and Parthenium hysterophorus, cloves of Allium sativum, bulb of Allium cepa, fruits of Emblica officinalis and rhizome of Zingiber officinale as inducers were assessed on physiological and biochemical activities in tomato against fusarim wilt caused by Fusarium oxysporum f. sp. lycopersici and the results showed that pre-application of inducers provided protection to the tomato plant and reduced the disease intensity. The minimum disease intensity (8.93%) was reported from garlic extract treated plant whereas, in case of control-I it was 96.12%. Treatment with plant extracts as inducers prior to challenge inoculation sensitized the seedlings to produce increased levels of soluble protein. The maximum increase in protein content was found in garlic extract treated seedlings (32.62 mg g-1) after 15 days of pathogen inoculation. A high content of phenols which are indicators of first stage of defence mechanism, was also recorded in treated leaves with maximum in garlic extract treatment representing 2.28 mg g-1 of fresh leaves against 1.52 mg g-1 of fresh leaves in control-II after 15 days of pathogen inoculation. The soluble protein content (r = -0.5995) and total phenol content (r = -0.5313) both showed a negative correlation with disease incidence. Apart from inducing effect in plant defences, plant extracts have also some direct effect on growth and development of the pathogen. Protein profiling by SDS-PAGE revealed that one new protein is synthesized due to effect of inducers that might be responsible for disease.
  S.K. Biswas , Mohd. Rajik , Muneeshwar Sharma , Prem Naresh , Upesh Kumar , Kishan Lal and Ravindra Singh
  Disease response to spot blotch by different varieties of wheat namely K 307, K 9644, K 9162, K 9351, K 9465 and HD 2985 revealed that all the varieties give variable response on disease severity. Among the varieties, minimum disease severity was recorded in K 9351 with the value of 30.07% at 65 days of plant. Biochemical analysis of leaves of different varieties of wheat revealed that the variable amount of phenol and soluble protein content. The maximum with 31.50 and 28.60 mg g–1 of soluble protein and 3.10 and 2.85 mg g–1 of total phenol content was found in K 9351 at 20 and 65 days of plant, respectively. The correlation co-efficient between disease severity and soluble protein and total phenol content at 65 days of wheat varieties revealed that there was negative correlation showing (r) -0.974 and -0.953. The regression equation of soluble protein and disease severity showed that higher regression value, lower disease incidence. It is also cleared that increase amount of total phenol and protein content both are associated with decreases of disease severity and both the parameter are reduced with the increase with age of plant. The RAPD analysis of different wheat varieties revealed that variable number and size of fragments are found among the varieties. The highest numbers of fragments are found in variety K 9351 which is 13. The presence or absence of fragment and their variable size might be the responsible for morphological and biochemical variability along with resistance response to spot blotch.
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