Fusarium wilt of pigeon pea

II. Changes in the host metabolism
  • S. Subramanian


Chlorophyll, ascorbic acid, free reducing sugars and total manganese were highest in the least susceptible variety N.P. 15 and lowest in the most susceptible N.P. 24. In the latter, total carbohydrates were more in the root than in the shoot, while in the former, the opposite trend was observed. Fe/Mn ratio was found to increase with increasing susceptibility. Under pathogenesis, there was progressive reduction in the contents of manganese, leaf pigments, ascorbic acid and total carbohydrates and an increase in the iron content, Fe/Mn ratio and free reducing sugars in N.P. 24 whereas in N.P. 15, although there was a reduction in leaf pigments and total carbohydrates, such a derangement was not apparent in the case of ascorbic acid and free reducing sugars. Transpiratory studies showed that there was an increase in the rate of transpiration during the early stage of the disease which was found to fall off gradually with the advancement of infection. The possible role of ethylene in wilt pathogenesis is discussed.


Total Carbohydrate Susceptible Variety Manganese Content Wilt Disease Ascorbic Acid Content 
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Copyright information

© Indian Academy of Sciences 1963

Authors and Affiliations

  • S. Subramanian
    • 1
  1. 1.University Botany LaboratoryMadras-5

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