Diversity and distribution of arbuscular mycorrhizal fungi associated with vegetable crops in Haryana, India

Abstract

The optimal growth and development of many vegetable crops hinge significantly upon their reliance on Arbuscular Mycorrhizal Fungi (AMF). Understanding the AMF status of vegetable crops can assist researchers in selecting suitable strains for future experiments. Therefore, a field work was carried out to determine the species diversity and composition of AMF with fifty vegetable crops from seventeen different districts of Haryana. AMF spores were isolated and identified to evaluate AMF density, diversity, and host preference in terms of AMF species richness, abundance and frequency of occurrence. Soil conditions, land use type and its physico–chemical properties played a crucial role in regulating the uneven distribution and composition of AMF. Mycotrophic structures such as linear infection (Arum–type) to coils (Paris–type) arbuscules and vesicles were seen. Interestingly, no correlation was found between spore number and root colonization. Maximum AMF spore density, spore richness and abundance were witnessed in Zea mays and Trigonella foenum–graecum. Five plants exhibited 100% AMF colonized roots, 15 plants showed above 75% and 12 plants above 50% colonization. Soil pH 6.10 to 7.40 supported the maximal abundance and frequency of occurrence of Glomus and Acaulospora with 53 species and 18 species followed by Acaulospora (18), Sclerocystis (10), Gigaspora (5), Entrophospora (4) and Sclerocystis (4). G. mosseae was the most preferred species among vegetable crops. Members of non–mycorrhizal families lack root colonization except for Brassica campestris, B. oleracea var. botrytis and B. Rapa where 2–11% root colonization was detected. Noticing the abundant AMF diversity of vegetable crops , this investigation expands the scope of detection, selection and inoculation of vegetable crops with suitable AMF species for improving their quality and quantity.

Keywords

• Abundance
• Frequency of occurrence
• Mycorrhizal distribution
• Soil properties
• Species richness

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