Rhizosphere and geocarposphere mycoflora of groundnut (Arachis hypogaea Linn)

  • P. Subrahmanyam
  • A. S. Rao


This study was undertaken to determine the influence of season (Kharif vs.Rabi) and moisture (irrigatedvs. rainfed condition) on groundnut rhizosphere and geocarposphere mycoflora. Fungal populations were always higher in rhizosphere than in geocarposphere while the geocarposphere populations always exceeded those populations in the field soil. Peaks in rhizosphere populations were found when the plants were at flowering stage and again at maturity. Geocarposphere populations showed only a slight increase with age until the plants were 90 days old and then rose rapidly until harvest. Qualitative differences appear to be related to temperature and soil moisture condition (as influenced by irrigation) inKharif andRabi season crops.Penicillium spp. were the most dominant group inKharif but disappeared inRabi. Aspergillus spp. were the second dominant group inKharif. A. flavus and otherAspergillus spp. were the most dominant fungi inRabi. Fusarium spp.,Macrophomina phaseolina, members of nucorales andTrichoderma spp., were the subdominant groups inKharif. Fusarium spp., were more dominant inRabi than inKharif. M. phaseolina was equally dominant in both seasons. Qualitative differences between field soil, rhizosphere and geocarposphere as also between irrigated and rainfed plots ofKharif were not marked. Populations were always higher inKharif than inRabi. The fungi which were found as dominants in geocarposphere were also found as dominants or subdominants in shells and kernels of developing pods in that season. Potentially plant pathogenic fungi isolated from field soil, rhizosphere and geocarposphere and plant parts were tested for pathogenicity on groundnut plants.


Field Soil Phaseolin Fungal Population Rabi Season Kharif Season 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Rao, A. S.,Plant and Soil 17 206 (1962).CrossRefGoogle Scholar
  2. 2.
    Joffe, A. Z.,Mycologia 60 908 (1968).CrossRefGoogle Scholar
  3. 3.
    Joffe, A. Z.,Mycopath. Mycol. Appl. 37 150 (1969).CrossRefGoogle Scholar
  4. 4.
    Sunar, M. S. and Chohan, J. S.,Plant Science 2 93 (1970).Google Scholar
  5. 5.
    Sunar, M. S. and Chohan, J. S.,Indian J. Agric. Sci. 41 29 (1971a).Google Scholar
  6. 6.
    Sunar, M. S. and Chohan, J. S.,Indian J. Agric. Sci. 41 38 (1971b).Google Scholar
  7. 7.
    Jackson, C. R.,Res. Bull. Univ. Ga. Coll. Agric. Expt. Stn. No. 26 (1968).Google Scholar
  8. 8.
    Griffin, G. J.,Phytopath. 62 1387 (1972).CrossRefGoogle Scholar
  9. 9.
    Chohan, J. S. and Raina, G. L.,XVI Annual Conf. Association of Microbiologists of India at Virbhadra (Rishikesh) (1975).Google Scholar
  10. 10.
    Jackson, C. R.,Phytopath.,55 499 (1965).Google Scholar
  11. 11.
    Joffe, A. Z. and Borut, S. Y.,Mycologia 58 629 (1966).PubMedCrossRefGoogle Scholar
  12. 12.
    Joffe, A. Z.,Plant and Soil 38 439 (1973).CrossRefGoogle Scholar
  13. 13.
    Joffe, A. Z. and Lisker, N.,Israel J. Bot. 18 77 (1969).Google Scholar
  14. 14.
    McDonald, D.,Trans. Br. Mycol. Soc. 53 393 (1969).CrossRefGoogle Scholar
  15. 15.
    Griffin, G. J. and Garren, K. H.,Phytopath. 64 322 (1974).Google Scholar
  16. 16.
    Subrahmanyam. P. and Prabhakar, C. S.,Plant and Soil 43 687 (1975).CrossRefGoogle Scholar
  17. 17.
    Porter, D. M. and Garren, K. H.,Trop. Sci. 10 100 (1968).Google Scholar
  18. 18.
    Rovira, A. D.,Ann. Rev. Microbiol. 19 241 (1965).CrossRefGoogle Scholar
  19. 19.
    Jensen, H. L.,Soil Sci. 31 123 (1931).CrossRefGoogle Scholar
  20. 20.
    Garrett, S. D.,Biology of Root Infecting Fungi Cambridge Univ. Press (1970).Google Scholar
  21. 21.
    McDonald, D.,Samaru Misc. Paper No. 27 Inst. Agric. Res., Ahmadu Bello Univ., Samaru, Zaria, Nigeria (1968).Google Scholar
  22. 22.
    Chohan, J. S.,Labdev J. Sci. and Technol. 9B 10 (1971).Google Scholar
  23. 23.
    Gangawane, L. V. and Deshponde, K. B.,Indian Phytopath. 26 325 (1973).Google Scholar
  24. 24.
    Subrahmanyam, P.,Ph.D. thesis submitted to S.V. University, Tirupati-517502 India (1975).Google Scholar
  25. 25.
    Jackson, C. R. and Bell, D. K.,Univ, Ga. Coll. Agric. Expt. Stn. Res. Bull. No. 56 (1969).Google Scholar
  26. 26.
    Bell, D. K.,Oleagineux 24 221 (1969).Google Scholar
  27. 27.
    Chohan, J. S., InCurrent Trends in Plant Pathology, Eds. S. P. Raychaudhury and J. S. Verma, Lucknow Univ., Lucknow, p. 171 (1974).Google Scholar
  28. 28.
    Narendra, D. V., Rao, V. G. and Mallikarjunaiah R. R.,Curr. Sci. 43 30 (1974).Google Scholar

Copyright information

© Indian Academy of Sciences 1977

Authors and Affiliations

  • P. Subrahmanyam
    • 1
  • A. S. Rao
    • 1
  1. 1.Department of BotanyS. V. UniversityTirupati

Personalised recommendations