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Journal of Botany
Volume 2014, Article ID 173125, 14 pages
http://dx.doi.org/10.1155/2014/173125
Research Article

Arbuscular Mycorrhizal and Dark Septate Endophyte Fungal Associations in South Indian Aquatic and Wetland Macrophytes

1Root and Soil Biology Laboratory, Department of Botany, Bharathiar University, Coimbatore, TamilNadu 641046, India
2Institute of Plant and Microbial Biology, 128 Sec. 2, Academia Road, Nankang, Taipei 11529, Taiwan

Received 20 July 2014; Revised 18 October 2014; Accepted 20 October 2014; Published 24 November 2014

Academic Editor: Jutta Ludwig-Müller

Copyright © 2014 Kumar Seerangan and Muthukumar Thangavelu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Investigations on the prevalence of arbuscular mycorrhizal (AM) and dark septate endophyte (DSE) fungal symbioses are limited for plants growing in tropical aquatic and wetland habitats compared to those growing on terrestrial moist or dry habitats. Therefore, we assessed the incidence of AM and DSE symbiosis in 8 hydrophytes and 50 wetland plants from four sites in south India. Of the 58 plant species examined, we found AM and DSE fungal symbiosis in 21 and five species, respectively. We reported for the first time AM and DSE fungal symbiosis in seven and five species, respectively. Intermediate-type AM morphology was common, and AM morphology is reported for the first time in 16 plant species. Both AM and DSE fungal colonization varied significantly across plant species and sites. Intact and identifiable AM fungal spores occurred in root zones of nine plant species, but AM fungal species richness was low. Though no clear relationship between AM and DSE fungal colonization was recognized, a significant negative correlation between AM colonization and spore numbers was established. Our study suggests that the occurrence of AM and DSE fungal symbiosis in plants growing in hydrophytic and wetland habitats is not as common as in terrestrial habitats.