Ravinderjit Kaura, Puja Ohria* & Renu Bhardwajb
aDepartment of Zoology, Guru Nanak Dev University, Amritsar-143005 (Punjab), India
bDepartment of Botanical & Environmental Sciences, Guru Nanak Dev University, Amritsar-143005 (Punjab), India
Received 15th June, 2013; Revised 20th July, 2013
Abstract : 28-Homobrassinolide was evaluated for its influence on susceptible (Pusa Ruby) and resistant (PNR-7) cultivars of tomato inoculated with second stage juveniles of root-knot nematode, Meloidogyne incognita. Morphological and biochemical parameters were investigated in roots 168 hrs after nematode inoculation. In susceptible cultivar, nematode invasion reduced the plant growth and development but HBl treatment improved the growth as observed from the amelioration of total antioxidant contents. In case of resistant plants, nematodes were not able to invade the roots and here also, pre-sowing treatment of seeds further enhanced the growth of plants. Moreover, nematode inoculation activated the level of antioxidants which further got enhanced with HBl treatment. Also, when the two varieties were compared for morphological and biochemical parameters, overall higher values were found in the resistant cultivar than in the susceptible one.