Arbuscular Mycorrhizal and Dark Septate Endophyte Fungal Associations in Two Dominant Ginger Species of Northeast India
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RESEARCH ARTICLE
Arbuscular Mycorrhizal and Dark Septate Endophyte Fungal Associations in Two Dominant Ginger Species of Northeast India Radha Raman Pandey1
•
Surbala Loushambam1 • Alok Kumar Srivastava2
Received: 19 August 2019 / Revised: 23 October 2019 / Accepted: 6 December 2019 The National Academy of Sciences, India 2020
Abstract Studies on the prevalence of arbuscular mycorrhizal fungi (AMF) and dark septate endophytic fungi (DSEF) are limited for rhizomatous crops in subtropical ecosystems compared to other terrestrial habitats. Hence, the authors assessed the incidence of AMF and DSEF in roots and diversity of AMF in the rhizosphere of Zingiber montanum and Z. officinale collected from shifting cultivation fields of Manipur, Northeast (NE) India. Both the gingers had dual colonization of AMF and DSEF structures in different cortical cells of the same examined root segments and revealed the Intermediate type of AM morphology. Such endomycorrhizal symbiotic association is being reported for the first time in Z. montanum. Distribution of different AMF and DSEF structures varied significantly across the two ginger species. The total root length colonization with AMF and DSEF was highest in Z. montanum. The maximum spore population of AMF was recorded in Z. officinale soil, whereas the AMF species richness was highest in Z. montanum rhizosphere. Altogether, 13 spore morphotypes of AMF corresponding to
Significance Statement This study reveals the first report on AM fungal diversity in the rhizosphere soil, and AM morphology, AM and DSE fungal colonization patterns in the roots of Z. montanum under shifting cultivation system of North Eastern India. & Radha Raman Pandey [email protected] 1
Department of Botany, Manipur University, Canchipur, Imphal, Manipur 795 003, India
2
National Bureau of Agriculturally Important Microorganisms (NBAIM), Kusmaur, Maunath Bhanjan, Uttar Pradesh 275103, India
eight genera, i.e., Acaulospora, Claroideoglomus, Funneliformis, Glomus, Rhizophagus, Sclerocystis, Scutellospora and Septoglomus were isolated from the field and trap culture soils of both ginger species. Significant positive correlations were recorded between some soil properties and root-colonizing variables of AMF and DSEF. Thus, the occurrence of native AMF and DSEF associations in two important indigenous gingers cultivated in the Jhum fields of hilly terrains reveals the possibility of utilizing them in the future for sustainable agriculture. Keywords AMF diversity DSE fungi Root colonization pattern Zingiber montanum Z. officinale
Introduction Members of Zingiberaceae, commonly known as gingers, are among the important horticultural crops mainly cultivated for its aromatic rhizomes which are used since times immemorial as spices, condiments, flavoring agents and for its potential medicinal properties being largely distributed in tropical and subtropical regions of Asia [1]. Manipur being a part of Northeast (NE) India lies within the Indo-Burma mega-biodiversity hot spot region having se
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