Submitted to: International Conference on Legume Genomics and Genetics
Publication Type: Abstract only
Publication Acceptance Date: 4/9/2006
Publication Date: 4/9/2006
Citation: Liu, J., Ramirez, M., Uhde-Stone, C., Graham, M., Ivashuta, S., Yamagishi, M., Gantt, J.S., Hernandez, G., Lara, M., Allan, D., Vance, C.P. 2006. Legume root genomic responses to phosphorus deficiency [abstract]. In: Genes to crops. 3rd International Conference on Legume Genomics and Genetics, April 9-13, 2006, Brisbane, Queensland, Australia. p. 28. Interpretive Summary:
Technical Abstract: Phosphorus (P) is an essential macronutrient for plant development and is second only to nitrogen as the most limiting nutrient for plant growth. Without substantial additions of P fertilizer, many soils are limited for P availability. Plants, particularly legumes, have developed adaptive mechanisms that aid in the acquisition of P from soils. Notable phenotypic changes include: modifications in root architecture (such as cluster roots, shallow angle lateral roots, and increased root hairs); exudation of organic acids and acid phosphatases; and proton extrusion. (Although mycorrhizal symbioses are the most common adaptation by plants to acquire P, that association will be addressed elsewhere in this meeting.) EST profiling in lupin and common bean has identified a plethora of genes that respond to P-deficiency. Recent data from our laboratories indicate that phloem transport and sugars are integrally related to P-deficiency induced gene expression in roots. Gene silencing via RNAi delivered to roots with Agrobacterium rhizogenes has successfully silenced genes involved in transport and signaling.