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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 and Donaghy, DJ and 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, 62 (4). pp. 497-506. ISSN 0142-5242

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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
Keywords: prairie grass, water-soluble carbohydrate reserves, regrowth, leaf, roots
Journal or Publication Title: Grass and Forage Science
Publisher: Blackwell Publishing Ltd
Page Range: pp. 497-506
ISSN: 0142-5242
Identification Number - DOI: 10.1111/j.1365-2494.2007.00607.x
Additional Information:

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

Date Deposited: 07 Apr 2008 14:32
Last Modified: 18 Nov 2014 03:35
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