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Impact of defoliation severity on photosynthesis, carbon metabolism and transport gene expression in perennial ryegrass

Citation

Lee, JM and Sathish, B and Donaghy, DJ and Roche, JR, Impact of defoliation severity on photosynthesis, carbon metabolism and transport gene expression in perennial ryegrass, Functional Plant Biology: An International Journal of Plant Function, 38, (10) pp. 808-817. ISSN 1445-4408 (2011) [Refereed Article]

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Copyright 2011 CSIRO

DOI: doi:10.1071/FP11048

Abstract

Defoliation severity affects grass regrowth. The changes to biological processes affecting regrowth induced by severe defoliation are not fully understood, nor have they been investigated at a molecular level in field-grown plants. Fieldgrown perennial ryegrass (Lolium perenne L.) plants were defoliated to 20, 40 or 60mmduring winter. Throughout regrowth, transcript profiles of 17 genes involved in photosynthesis and carbon metabolism or transport were characterised in stubble and lamina tissue. Although defoliation to 20mm reduced residual lamina area and stubble water-soluble carbohydrate reserves compared with plants defoliated to 40 or 60 mm,net herbage regrowth was not reduced. Transcript profiles indicated a potential compensatory mechanism that may have facilitated regrowth. At the one-leaf regrowth stage, plants defoliated to 20mm had greater abundance of photosynthesis-related gene transcripts (rca, rbcS1, rbcS2, fba, fbp and fnr) and 20% greater stubble total nitrogen than plants defoliated to 60 mm. A greater capacity for photosynthesis in outer leaf sheaths may be one potential mechanism used by severely defoliated plants to compensate for the reduced residual lamina area; however, this premise requires further investigation.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Crop and Pasture Production not elsewhere classified
Objective Division:Animal Production and Animal Primary Products
Objective Group:Pasture, Browse and Fodder Crops
Objective Field:Sown Pastures (excl. Lucerne)
Author:Lee, JM (Mr Jenn Ming Lee)
Author:Donaghy, DJ (Associate Professor Danny Donaghy)
Author:Roche, JR (Dr John Roche)
ID Code:74101
Year Published:2011
Web of Science® Times Cited:8
Deposited By:Agricultural Science
Deposited On:2011-11-11
Last Modified:2012-05-17
Downloads:0

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