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Indian Journal of Nematology
Year : 2007, Volume : 37, Issue : 2
First page : ( 149) Last page : ( 155)
Print ISSN : 0303-6960.

Phenylalanine Ammonia Lyase and Total Phenol Content in Resistant Banana to Pratylenchus coffeae

Devi A. Nithya1,*, Ponnuswami V.1, Sundararaju P.2, Soorianathasundaram K.1, Sathiamoorthy S.2, Uma S.1, Van Den Bergh I.3

1Department of Fruit Crops, Tamil Nadu Agricultural University, Coimbatore, India

2National Research Centre for Banana, Tiruchirapalli, India

3Biodiversity, France.

*E-mail: a_nithyadevi@hotmail.com

Accepted:  October,  2007.


The biochemical alterations in resistance banana accessions showed that relatively higher Phenylalanine Ammonia Lyase (PAL) activity than the susceptible ones indicating the inherent higher content of PAL in resistant accessions. The higher activity of this enzyme in resistant accessions viz., Karthobiumtham, M. balbisiana, Kanai Bansi, Bhimkol, Athiakol, Aittakol, Kechulepa was negatively correlated with lesion index of roots and corm. Increase in phenol content and enzyme activities were negatively related with the degree of infestation. In the present study, total phenol estimated in roots of banana genotypes showed that these compounds were higher in resistant accessions than susceptible ones.


Key words

Banana, root lesion nematode, phenylalanine ammonia lyase activity, total phenol, resistance mechanism.


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