• R Kalyanasundaram

      Articles written in Proceedings – Plant Sciences

    • Electrophoretic and antigenic studies of soluble proteins inFusarium wilt of cotton

      R Balasubramanian R Kalyanasundaram

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      Polyacrylamide gel electrophoretic (PAGE) analysis ofFusarium infected cotton plants showed the disappearance of some erstwhile protein bands and the appearance of new bands to a greater degree in the compatible host-parasite combinations (Gossypium hirsutum/A1 strain;G. arboreum/I2 strain ofF. vasinfectum). Also, an increase in the number of antigenic proteins of the host following infection has been noticed only in the compatible host-parasite combinations as shown by agar double diffusion and immunoelectrophoretic studies. The newly formed antigens did not appear to originate either from the extracellular or intracellular protein pool of the pathogen; probably these are products of altered metabolism of the host species.

    • Strains ofFusarium vasinfectum VI. pathogenicity andin vivo production of pathogen factorst

      C Lakshminarasimham R Kalyanasundaram

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      Two American isolates and three Indian isolates ofFusarium vasinfectum representing two strainal groups were studied on their congenial and uncongenial hosts for their pathogenicity andin vivo production of pathogen factors. The Indian isolates produced a characteristic vein clearing symptoms on their congenial hostGossypium arboreum while the American isolates produced yellowing and abscission of the leaves on their congenial hostG. hirsutum. In cross inoculation studies these isolates produced atypical symptoms on their uncongenial hosts. Studies onin vivo production of pectin methyl esterase (PME) showed that this enzyme may have a role in pathogenesis ofG. arboreum but not ofG. hirsutum. However the enzyme polygalacturonase (PG) appears to have role in the pathogenesis ofG. arboreum as well asG. hirsutum. The toxin fusaric acid was found inG. arboreum plants infected by the Indian isolates. No fusaric acid could, however, be detected inG. hirsutum infected by any of the isolates studied. Thus fusaric acid appears to have a role in the selective pathogenicity of the Indian isolates and also its production seems to be selective. The present study indicates that different pathogen factors are involved in the development of different symptoms on the two species of cotton.

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