Plant and Soil

, Volume 80, Issue 1, pp 105–117 | Cite as

Allelopathic effects ofEupatorium riparium on population regulation of two species ofGalinsoga and soil microbes

  • J. P. N. Rai
  • R. S. Tripathi


Allelopathic effect ofEupatorium riparium Regel, a dominant ruderal weed at higher altitudes in Meghalaya state in north-eastern India, was studied on two common sympatric annual weeds,Galinsoga ciliata (Raf.) andG. parviflora Cav. and on soil microbes. Seed germination and radicle and plumule growth of both species ofGalinsoga were suppressed by the aqueous extract and leachate ofE. riparium. Although the leaf leachate, leaf and litter extracts and litter bed caused considerable reduction in leaf area and seed and dry matter production in both species ofGalinsoga, the effect was much more pronounced onG. parviflora. The inhibitory effect was directly correlated with the concentration of the extract and leachate. The soil microbial population and growth of theGalinsoga spp. declined considerably in the experimental pots where the soil had earlier received leachate of different plant parts ofE. riparium growing in it. The presence of the partly decomposed litter ofE. riparium in the pots reduced soil microbial population and growth of the two weeds much more strongly as compared to the litter in the advanced stages of decomposition. The study also revealed that the abundance and colony growth of the two test fungiviz. Trichoderma viride andAspergillus flavus were differentially affected by the allelopathy ofE. riparium; T. viride being favoured andA. flavus inhibited.

Key words

Allelopathy Leaf leachate Litter Plant extract Population regulation Soil microbes Weed biology 


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  1. 1.
    Akhtar N, Naqui H H and Hussain F 1978 Biochemical inhibition (allelopathy) exhibited byCenchrus ciliaris Linn. andChrysopogan aucheri (Bioss) Staff. Pak. J. For. 28, 194–200.Google Scholar
  2. 2.
    del Moral R and Cates R R 1971 Allelopathic potential of dominant vegetation of Western Washington. Ecology 52, 1030–1037.Google Scholar
  3. 3.
    Dirvi G A and Hussain F 1979 Allelopathic effects ofDichanthium annulatum (Forssk) Staff. on some cultivated species. Pak. J. Sci. Ind. Res. 22, 194–199.Google Scholar
  4. 4.
    Friedman J, Orshan G and Ziger efir Y 1977 Suppression of annuals byArtemisia herbaalba in the Negev desert of Israel. J. Ecol. 65, 413–426.Google Scholar
  5. 5.
    Hull J C and Muller C H 1977 The potential for dominance byStipa pulchra in a California grassland Am. Midl. Nat. 97, 147–175.Google Scholar
  6. 6.
    Hussain F and Gadoon M A 1981 Allelopathic effects ofSorghum vulgare Pers. Oecologia 51, 284–288.Google Scholar
  7. 7.
    Kein R 1975 Quantitative effects of incorporating rice residue on populations of soil microflora. Mycologia 67, 283–287.Google Scholar
  8. 8.
    Lockerman R H and Putnam A R 1981 Mechanisms for differential interference among cucumber (Cucumis sativus L.) accessions. Bot. Gaz. 142, 427–430.Google Scholar
  9. 9.
    Lodhi M A K 1976 Role of allelopathy as expressed by dominating trees in a lowland forest in controlling the productivity and pattern of herbaceous growth. Am. J. Bot. 63, 1–8.Google Scholar
  10. 10.
    Lodhi M A K 1978 Comparative inhibition of nitrifiers and nitrification in a forest community as a result of allelopathic nature of various tree species. Am. J. Bot 65, 1135–1142.Google Scholar
  11. 11.
    Mishra R R and Sharma G D 1977 Ecology of soil fungi: Population variation in relation to varying cover vegetation and soil factors. Syd. Ann. Mycol. Ser. II, 30, 134–140.Google Scholar
  12. 12.
    Muller C H 1969 Allelopathy as a factor in ecological process. Vegetatio 18, 348–357.Google Scholar
  13. 13.
    Naqui H H and Muller C H 1975 Biochemical inhibition (Allelopathy) exhibited by Italian-Rye grass (Lolium multiflorum). Pak. J. Bot. 7, 139–147.Google Scholar
  14. 14.
    Neill R L and Rice E L 1971 Possible role ofAmbrosia psilostachya on patterning succession in old fields. Am. Midl. Nat. 86, 344–357.Google Scholar
  15. 15.
    Newman E I and Rovira A D 1975 Allelopathy among some British grassland species. J. Ecol. 63, 727–737.Google Scholar
  16. 16.
    Parker V T and Muller C H 1979 Allelopathic dominance by tree-associated herb in a California annual grassland. Oecologia 37, 315–320.Google Scholar
  17. 17.
    Putnam A R and Duke W B 1978 Allelopathy in agroecosystems. Ann. Rev. Phytopathol. 16, 431–451.Google Scholar
  18. 18.
    Rai J P N and Tripathi R S 1982 Allelopathy as a factor contributing to dominance ofEupatorium riparium Regel. Indian. J. Ecol. 9, 14–20.Google Scholar
  19. 19.
    Rice E L 1974Allelopathy, Academic Press Inc., New York.Google Scholar
  20. 20.
    Rice E L 1977 Some roles of allelopathic compounds in plant communities. Biochem. Syst. Ecol. 5, 201–206.Google Scholar
  21. 21.
    Rice E L 1979 Allelopathy—an update. Bot. Rev. 45, 15–109.Google Scholar
  22. 22.
    Rovira A D 1969 Plant root exudate. Bot. Rev. 35, 35–39.Google Scholar
  23. 23.
    Schlatterer E F and Tisdale E W 1969 Effects of litter ofArtermisia, Chrysothamnus andTortula on germination and growth of three perennial, grasses. Ecology 50, 869–873.Google Scholar
  24. 24.
    Stowe, L G 1979 Allelopathy and its influence on the distribution of plants in an Illinois old field. J. Ecol. 67, 1065–1085.Google Scholar
  25. 25.
    Tripathi R S, Singh R S and Rai J P N 1981 Allelopathic potential ofEupatorium adenophorum—a dominant ruderal weed of Meghalaya. Proc. Indian natn. Sci. Acad. B 47, 458–465.Google Scholar
  26. 26.
    Usami Y 1976 Ecological studies on weeds in mulberry fields. 2, Auto-ecology ofGalinsoga parviflora Cav. Weed Res. Japan 21, 76–80.Google Scholar
  27. 27.
    Walkley A and Black I A 1934 An examination of the Degtjareff method for determining soil organic matter and proposed modification of the chromic acid titration method. Soil. Sci. 37, 29–38.Google Scholar
  28. 28.
    Whittaker R H 1970 Communities and Ecosystems. Macmillan, New York.Google Scholar
  29. 29.
    Whittaker R H 1971 The Chemistry of communitiesIn Biochemical Interactions Among Plants, Nat. Acad. Sci. Washington.Google Scholar
  30. 30.
    Whittaker R H and Feeny P P 1971 Allelochemics: Chemical interactions between species. Science 171, 757–770.PubMedGoogle Scholar

Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1984

Authors and Affiliations

  • J. P. N. Rai
    • 1
  • R. S. Tripathi
    • 1
  1. 1.Botany Department, School of Life SciencesNorth-Eastern Hill UniversityShillongIndia

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