Atkinson, Christopher J. and Else, Mark A. (2012) Hydraulic conductivity and PAT determine hierarchical resource partitioning and ramet development along Fragaria stolons. Journal of Experimental Botany, 63 (14). pp. 5093-5104. ISSN 0022-0957 (Print), 1460-2431 (Online) (doi:10.1093/jxb/ers155)

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Abstract

Co-ordination of metabolic and physiological activity between plant parts is key to the control of growth and development. Here the movement of resources and their allocation between mother plants and daughter ramets along Fragaria stolons was quantified with respect to hierarchy. Gradients of internodal ramet leaf water potential (ψ) and stolon and ramet hydraulic conductivities (L) were measured together with apparent stolon IAA movement via the polar auxin transport pathway (PAT). These processes are linked with measurements of stolon vascular development. The pattern of tissue differentiation and lignification in sequential stele sections of stolons demonstrated the rapid acquisition of the capacity for water transport, with transpiration potentially varying systematically with stolon lignification and the acropetal decline in stolon xylem ψ. Stolon and ramet L declined acropetally, with L across older ramets being significantly lower than that of the connecting stolons. The capacity for polar IAA transport increased with stolon age; this was due to increased transport intensity in older tissues. The partitioning of dry matter was strongly hierarchical with younger ramets smaller than older ramets, while foliar concentrations of N, P, and K were greater for the younger ramets. The results show that stolon anatomy develops rapidly at the apical end, facilitating hierarchical ramet development, which is evident as a basipetal increase in L. The rapid development of transport tissue functionality enables young unrooted ramets to acquire water, in order to supply an expanding leaf area, as well as mineral ions disproportionally with respect to older ramets. This facilitates colonization and self-rooting of apical ramets. The unidirectional increase in basipetal PAT along stolons facilitates hierarchical ramet development.

Item Type:	Article
Additional Information:	[1] First published online: July 12, 2012. [2] Published in print: September 2012. [3] Published as: Journal of Experimental Botany, (2012), Vol. 63, (14), pp. 5093-5104. [4] Published by Oxford University Press on behalf of the Society for Experimental Biology. [5] Copyright: © The Author [2012]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved.
Uncontrolled Keywords:	auxin, fragaria, hydraulic conductivity, polar auxin transport, stolons, ramets
Subjects:	S Agriculture > S Agriculture (General) S Agriculture > SB Plant culture
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science > Natural Resources Institute
Related URLs:	Publisher Organisation Organisation
Last Modified:	29 Jul 2015 17:18
URI:	http://gala.gre.ac.uk/id/eprint/9278

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