Evaluation, grafting success and field establishment of cashew rootstock as influenced by VAM fungi.

Department of Agricultural Microbiology, University of Agricultural Sciences, GKVK Campus, Bangalore, India.
Indian journal of experimental biology (Impact Factor: 1.2). 12/2004; 42(11):1132-5.
Source: PubMed

ABSTRACT Seven isolates of vesicular arbuscular mycorrhizal (VAM) fungi were isolated from cashew rhizosphere soil of different cashew growing regions of South India. These seven isolates along with two more VAM fungi namely Acaulospora laevis and Glomus mosseae, which were found to be better symbionts for cashew during our earlier study were used to study their effectiveness on the growth and nutrition of cashew rootstock Ullal-1. Four promising VAM fungi were selected based on this study. Rootstocks inoculated with these four fungi were evaluated for their vigour through grafting success, using Ullal-3 cashew variety as scion. Grafting success was more in rootstocks inoculated with A. laevis and one of local isolates Glomus etunicatum. Grafts with rootstock treated with G. etunicatum and A. laevis survived and performed better when planted in the field compared to the uninoculated and other VAM fungal treatments.

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    ABSTRACT: The arbuscular mycorrhizal status of 46 medicinal plant species of herbs and shrubs in the western ghats of Karnataka region were surveyed during the month of September and November 2010 and 2011. Percent colonization, spore density and diversity of arbuscular mycorrhizal fungi associated with the rhizospheric soil and roots of medicinal plants growing wild as well as under cultivated conditions in this area were investigated. It was found that 100% of the surveyed species were mycorrhizal. The spore density of AMF ranged from 15 to 520 spores per 100 g of soil. Percent root colonization and spore density was comparatively higher in the KDU region than other sampling sites. A total of 40 AMF morphotypes were recovered, of this 4 were identified upto genus level. Among 36 identified AMF taxa Glomus sps. were found to be very dominant in the rhizosphere of medicinal plants followed by Acaulospora sps., Gigaspora sps., Scutellospora sps., Paraglomus sps and Pacispora sps. Variation in the spore density and percent colonization among different sampling sites could be attributed to host specificity, adaphic and climatic conditions.
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