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Patterns of leaf and root regrowth, and allocation of water-soluble carbohydrate reserves following defoliation of plants of prairie grass (Bromus willdenowii Kunth.)

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Turner, LR ORCID: 0000-0001-8954-7069, Donaghy, DJ, Lane, PA and Rawnsley, RP 2007 , 'Patterns of leaf and root regrowth, and allocation of water-soluble carbohydrate reserves following defoliation of plants of prairie grass (Bromus willdenowii Kunth.)' , Grass and Forage Science, vol. 62, no. 4 , pp. 497-506 , doi: 10.1111/j.1365-2494.2007.00607.x.

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Abstract

This study utilized leaf stage-based defoliation intervals to describe the concentrations and contents of watersoluble carbohydrate (WSC) and nitrogen (N) in stubble and root reserves and their effect on the regrowth of prairie grass (Bromus willdenowii Kunth.) plants. The priority sequence for allocation of WSC reserves during the regrowth period was also investigated. There were substantially higher concentrations of WSC and N in the stubble compared with the roots following defoliation, confirming the stubble as the primary site for energy storage, with roots playing a lesser role. However, high R2 values for the relationships between WSC concentration in roots and regrowth variables suggested that plants of prairie grass were reliant on WSC reserves from the roots in addition to the stubble to meet the energy requirements of plants until adequate photosynthetic tissue had been produced. The sequence of priority for allocation of WSC reserves followed the order of leaf growth, root growth and tillering during the regrowth period. Although WSC reserves were identified as the primary contributor to plant regrowth following defoliation, there was also a strong relationship between stubble N concentration and regrowth variables.

Item Type: Article
Authors/Creators:Turner, LR and Donaghy, DJ and Lane, PA and Rawnsley, RP
Keywords: prairie grass, water-soluble carbohydrate reserves, regrowth, leaf, roots
Journal or Publication Title: Grass and Forage Science
Publisher: Blackwell Publishing Ltd
ISSN: 0142-5242
DOI / ID Number: 10.1111/j.1365-2494.2007.00607.x
Additional Information:

The definitive version is available at www.blackwell-synergy.com

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