Plant and Soil

, Volume 238, Issue 2, pp 235–244 | Cite as

Influence of the mycorrhizal fungus, Glomus coronatum, and soil phosphorus on infection and disease caused by binucleate Rhizoctonia and Rhizoctonia solani on mung bean (Vigna radiata)

  • R.S. Kasiamdari
  • S.E. Smith
  • F.A. Smith
  • E.S. Scott

Abstract

Root-infecting fungal pathogens and also parasites, which do not cause major disease symptoms cause problems of contamination in pot cultures of arbuscular mycorrhizal (AM) fungi. We investigated the effect of the AM fungus, Glomus coronatum Giovannetti on disease caused by binucleate Rhizoctonia sp. (BNR) and R. solani in mung bean in the absence (P0) and presence (P1) of added soil phosphorus (P). When G. coronatum and BNR or R. solani were inoculated at the same time, G. coronatum improved the growth of the plants and reduced colonization of roots by BNR, but not by R. solani. R. solani reduced the growth of non-mycorrhizal mung bean in P0 soil 6 weeks after inoculation, whereas BNR had no effect on growth. G. coronatum reduced the severity of disease caused by BNR or R. solani on mung bean in both soil P treatments. When G. coronatum was established in the roots 3 weeks before BNR or R. solani was added to the potting mix, there was no significant effect of BNR or R. solani on growth of mung bean. Prior colonization by G. coronatum slightly reduced indices of disease caused by BNR or R. solani. In both experiments, addition of P stimulated plant growth and reduced the colonization of roots by BNR, but had little effect on disease severity. We conclude that the reduction of the effect of BNR or R. solani on mung bean could not be explained by improved P nutrition, but could be attributed to the presence of G. coronatum within and among the roots.

AM fungus colonization disease severity P nutrition Rhizoctonia Vigna radiata 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • R.S. Kasiamdari
    • 1
  • S.E. Smith
    • 1
  • F.A. Smith
    • 1
  • E.S. Scott
    • 2
  1. 1.Department of Soil and Water, and Centre for Plant Root SymbiosisThe University of Adelaide, Waite Campus, PMB1Glen OsmondAustralia
  2. 2.Faculty of BiologyGadjah Mada University, Jl. Tekhnika SelatanSekip UtaraIndonesia

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