The incidence of mycorrhizas in the roots and Endogone spores in rhizosphere soil of 52 xerophytes, 21 halophytes and 16 hydrophytes from Pakistan was investigated. Vesicular-arbuscular mycorrhizas were of general occurrence in all plants examined except hydrophytes and members of the families Urticaceae, Casuarinaceae, Nyctaginaceae, Portulaceae, Caryophyllaceae, Amaranthaceae, Chenopodiaceae, Capparaceae, Oleaceae, Elaeagnaceae, Zygophyllaceae, Tamaricaceae, Euphorbiaceae and Palmae. Mycorrhizas were found mainly in the surface and subsurface horizons of the soil, and they were much less abundant in the deeper layers, although the abundance of Endogone spores did not decrease with depth. Endogone spores were rare in permanently waterlogged soils, which suggested that soil moisture affected spore number. Most other soil samples contained Endogone spores, including some from rhizospheres of non-mycorrhizal plants. In some soils an increase in spore numbers was recorded in the autumn and winter and a decrease in the spring and summer.


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