Department of Plant Pathology, Annamalai University, Chidambaram 608 002.
*Corresponding author's present address: Coconut Research Station, Veppankulam.
**Department of Horticulture, Annamalai University.
The pathogen Alternaria polyanthi causes leaf spot in tuberose. The changes in the biochemical properties of infected tuberose leaves were assessed and the results were compared with healthy leaves. Induction of related enzymes and sugars were assessed. The total phenol content of the infected leaves was found to be higher than the healthy leaves. Likewise, the changes in the activities of the peroxidase, polyphenol oxidase, phenylalanine ammonia-lyase, total sugars, reducing sugar and non-reducing sugar were also determined at different time intervals and the results implicated that these defence chemicals were induced following the pathogen infection and then their activities declined.
Alternaria polyanthi, tuberose, biochemical changes
