Sucrose transport in the phloem: integrating root responses to phosphorus starvation

Journal of Experimental Botany
John P Hammond, Philip J White

Abstract

Sugars in plants, derived from photosynthesis, act as substrates for energy metabolism and the biosynthesis of complex carbohydrates, providing sink tissues with the necessary resources to grow and to develop. In addition, sugars can act as secondary messengers, with the ability to regulate plant growth and development in response to biotic and abiotic stresses. Sugar-signalling networks have the ability to regulate directly the expression of genes and to interact with other signalling pathways. Photosynthate is primarily transported to sink tissues as sucrose via the phloem. Under phosphorus (P) starvation, plants accumulate sugars and starch in their leaves. Increased loading of sucrose to the phloem under P starvation not only functions to relocate carbon resources to the roots, which increases their size relative to the shoot, but also has the potential to initiate sugar-signalling cascades that alter the expression of genes involved in optimizing root biochemistry to acquire soil phosphorus through increased expression and activity of inorganic phosphate transporters, the secretion of acid phosphatases and organic acids to release P from the soil, and the optimization of internal P use. This review looks at the evidence fo...Continue Reading

Citations

May 3, 2011·Plant Molecular Biology·Qing-Jun LuoChristopher D Rock
Feb 25, 2014·Plant Physiology and Biochemistry : PPB·Athikkattuvalasu S KarthikeyanKashchandra G Raghothama
Jan 27, 2009·Journal of Experimental Botany·Wei-Yi LinTzyy-Jen Chiou
Apr 7, 2009·Journal of Experimental Botany·John P HammondDuncan J Greenwood
Aug 16, 2011·Journal of Experimental Botany·Peter J Gregory, Timothy S George
May 18, 2013·Journal of Experimental Botany·Saad SuliemanLam-Son Phan Tran
May 17, 2011·Plant Physiology·Jianbo ShenFusuo Zhang
Apr 14, 2011·Plant Physiology·John P Hammond, Philip J White
Nov 16, 2013·Journal of Experimental Botany·Ignatious MatimatiMichael D Cramer
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Jun 28, 2011·Plant Signaling & Behavior·Mingguang Lei, Dong Liu

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