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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.)

Citation

Turner, LR and Donaghy, DJ and Lane, PA and Rawnsley, RP, 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, 62, (4) pp. 497-506. ISSN 0142-5242 (2007) [Refereed Article]

Copyright Statement

Copyright 2007 The Authors

DOI: doi:10.1111/j.1365-2494.2007.00607.x

Abstract

This study utilized leaf stage-based defoliation intervals to describe the concentrations and contents of water-soluble 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. © 2007 The Authors.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Agronomy
Objective Division:Animal Production and Animal Primary Products
Objective Group:Pasture, Browse and Fodder Crops
Objective Field:Sown Pastures (excl. Lucerne)
Author:Turner, LR (Dr Lydia Turner)
Author:Donaghy, DJ (Associate Professor Danny Donaghy)
Author:Lane, PA (Associate Professor Peter Lane)
Author:Rawnsley, RP (Dr Richard Rawnsley)
ID Code:40046
Year Published:2007
Web of Science® Times Cited:8
Deposited By:Agricultural Science
Deposited On:2007-08-01
Last Modified:2013-12-13
Downloads:0

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