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Indian Journal of Nematology
Year : 2007, Volume : 37, Issue : 2
First page : ( 131) Last page : ( 134)
Print ISSN : 0303-6960.

Role of Phenolics and Enzymes in Imparting Resistance to Rice Plants against Root-Knot Nematode, Meloidogyne graminicola

Mishra C.D.1, Mohanty K.C.2

1Entomology Division, Central Rice Research Institute, Cuttack, Orissa-753 006, India

2Nematology Department, Orissa University of Agriculture and Technology, Bhubaneswar-751 003, India

Accepted:  September,  2007.


Three rice varieties, Annapurna (susceptible), Manika (moderately resistant) and Ramakrishna (resistant), were grown in pots in a greenhouse and inoculated with rice root-knot nematode (Meloidogyne graminicola) @ 1 J2/g soil. Infected plant roots of Annapurna, Manika and Ramakrishna produced greater amount of phenolics, by 27.7, 47.6 and 104.2% respectively as compared to their healthy ones. Similarly activity of enzyme, Phenylalanine ammonia lyase (PAL) increased by 16, 50.26 and 63.24% correspondingly, reducing amount of the aminoacid phenyl alanine content by 16.39, 35.4 and 68%. Tyrosine ammonia lyase (TAL) activity increased in the infected root by 9, 19.18 and 53.89% with 1.89, 18.6 and 35.89% decrease in the contents of amino acid tyrosine. Amino acid tryptophan decreased @ 27.65, 23.07 and 13.63% respectively. Reaction of the varieties to the nematode can be ascertained by analyzing these biochemicals.


Key words

Rice, Meloidogyne graminicola, phenolics, phenyalanine ammonia lyase and tyrosine ammonia lyase, resistance.


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