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In order to test the hypothesis that cecidozoa induced neoplastic formations on trees affect biochemical
characteristics of both, the new formed galls and host plant tissues. Biochemical characteristics with a
possible adaptive role were determined during Trioza jambolanae (a psyllid) induced cecidogenesis on
the host tree Syzygium cumini Linn. (Family- Myrtaceae). Photosynthetic pigments chl.a and b,
extractable protein, total sugars, amino acids, phenols, prolines and oxidative enzyme activities were
determined and compared in galled and ungalled leaf tissues. Results of biochemical estimation at
different stages of cecidogenesis showed variations in the amount of these biochemicals. Gradual
decrease in photosynthetic pigments and protein content were observed whereas low content of total
sugars, extractable amino acids and prolines were evident during the initial stage of cecidogenesis which
showed an increase in 30 days old gall, whereas decrease in amount of these were observed at gall
maturity. Besides these quantification of oxidative enzymes activity of IAA and Polyphenol oxidase was
also done. An increase in oxidative activities of both the enzymes was evident in 30 days old galls. The
present data reflect long term systemic effects of gall formation on host tree physiology, suggesting that
gall inducer affects adaptive responses of host plants.
Key Words: Cecidogenesis, Neoplastic, Ungalled, Polyphenol oxidase, Biochemicals.