Cotton stunting corrected by inoculation with arbuscular-mycorrhizal fungal spores

Thompson, J. P. and Seymour, N. P. and Clewett, T. G. (2011) Cotton stunting corrected by inoculation with arbuscular-mycorrhizal fungal spores. In: 4th Asian Conference on Plant Pathology and the 18th Biennial Australasian Plant Pathology Society Conference (ACPP/APPS 2011): New Frontiers in Plant Pathology for Asia and Oceania, 26-29 Apr 2011, Darwin, Australia.

Abstract

Poor crop growth after long periods of fallow, called ‘longfallow disorder’ in the Australian northern grain and cotton region, is caused by a decline in natural arbuscular-mycorrhizal fungi (AMF). In a glasshouse experiment, cotton plants (cv. Deltapine 90) were grown in pots containing 22 kg of pasteurised (steam at 70°C, for 1 h) or unpasteurized vertosol of moderate P fertility (29 mg P/kg soil, Colwell method) from Emerald, Qld (Lat. 23.53 S, Long. 148.67E). At 42 days after sowing, plants in pasteurised soil were stunted (tops 0.7g d.w./plant; AMF colonisation 0%) compared with those in unpasteurised soil (tops 6.2 g; AMF colonization 47.9%). To determined if stunting resulted from loss of AMF, cotton plants already growing in the pasteurised soil were treated factorially: (a) left untreated, (b) inoculated with AMF spores (6 spores/g soil of Glomus mosseae, strain Hart 5), (c) fertilised with P (50 mg/kg soil) or (d) a combination of AMF spores and P. Growth of plants treated with AMF or P improved from 40 days after treatment to maturity (total wt 27.6 g; raw cotton 10.5 g for +AMF ‐P). The untreated plants remained stunted (0.4 g) and produced no bolls. The high mycorrhizal dependency of cotton in this experiment (98% and 36% for total weight in –P and +P treatments respectively, and 100% and 36% for raw cotton) demonstrated the essentiality of the arbuscular‐mycorrhizal symbiosis for cotton production in this region.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Poster)
Refereed: No
Item Status: Live Archive
Additional Information: Abstract only published - #148.
Faculty / Department / School: No Faculty
Date Deposited: 12 Sep 2016 00:32
Last Modified: 15 Sep 2017 02:57
Fields of Research : 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070303 Crop and Pasture Biochemistry and Physiology
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
URI: http://eprints.usq.edu.au/id/eprint/29660

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