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International Journal on Algae
SJR: 0.216 SNIP: 0.322 CiteScore™: 0.4

ISSN Imprimer: 1521-9429
ISSN En ligne: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v14.i4.80
pages 380-389

Host-Pathogen Interaction Studies Between Susceptible and Tolerant Tea Clones in Relation to Red Rust Disease

Mohan Ramya
Department of Biotechnology, K.S. Rangasamy College of Technology, Tiruchengode-637 215, Namakkal District, Tamil Nadu, India
P. Ponmurugan
Department of Biotechnology, K.S. Rangasamy College of Technology, Tiruchengode-637 215, Namakkal District, Tamil Nadu, India

RÉSUMÉ

An experiment was conducted to estimate the growth response as biometric, physiological and biochemical changes in tea leaves due to red rust disease caused by an algal pathogen, Cephaleuros parasiticus Karst. between susceptible (UPASI-9) and tolerant (UPASI-3) cultivars. Biometric parameters such as fresh weight, dry weight, dry matter content, leaf moisture and intermodal length were reduced significantly in infected leaves when compared to healthy ones. Physiological responses of tea plants to infection in term of photosynthetic rate, transpiration rate, stomatal conductance and water use efficiency were also reduced in infected leaves. Similarly, biochemical constituents such as total chlorophyll, carotenoid, sugar, nitrogen, amino acids, protein, polyphenols and catechins of infected and healthy leaves were also studied. The results revealed that all the biochemical parameters were reduced significantly in infected leaves rather than healthy ones. However, the reduction was more prominent in susceptible cultivar than in tolerant ones. Similarly, the effect of red rust incidence on some of the tea quality parameters of black teas was evaluated between UPASI-9 and UPASI-3 clones which revealed almost all the tea quality parameters were declined sharply in infected leaves. The reduction of tea quality parameters was found to be higher in susceptible than in tolerant clones.


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