Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 9/1/2001
Publication Date: N/A
Technical Abstract: The growth and development of the root system is under genetic control but is modified by the environment. One of the most important environmental factors that influence root system development is soil temperature. Soil temperature changes have also been shown to impact the association of mycorrhizal fungi with roots which can impact both water and nutrient utilization. A series of studies in which cotton genotypes having differin amounts of cold tolerance were grown at either 28 or 18C soil temperature for 30 days. The impact of these temperature regimes on root development and mycorrhizal colonization was determined. A positive relationship was observed between root length and cold tolerance. The relationship appeared to be stronger for plants grown at 18C suggesting a differential expression of the cold tolerance traits. In general, there was no relationship between mycorrhizal colonization and cold tolerance characteristics across the genotypes tested. Cold soil temperatures appeared to restrict mycorrhizal colonization regardless of the plant's ability to tolerate these conditions.