Energy sorghum hybrids: functional dynamics of high nitrogen use efficiency

Olson, Sara N., Ritter, Kimberley, Medley, Jim, Wilson, Ted, Rooney, William L. and Mullet, John E. (2013) Energy sorghum hybrids: functional dynamics of high nitrogen use efficiency. Biomass and Bioenergy, 56 307-316. doi:10.1016/j.biombioe.2013.04.028

Author Olson, Sara N.
Ritter, Kimberley
Medley, Jim
Wilson, Ted
Rooney, William L.
Mullet, John E.
Title Energy sorghum hybrids: functional dynamics of high nitrogen use efficiency
Journal name Biomass and Bioenergy   Check publisher's open access policy
ISSN 0961-9534
Publication date 2013-09-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.biombioe.2013.04.028
Volume 56
Start page 307
End page 316
Total pages 10
Place of publication Oxford, United Kingdom
Publisher Pergamon
Language eng
Formatted abstract
The nitrogen use efficiency (NUE) of high biomass energy sorghum hybrid plants increased during 180 days of growth to a maximum of 370g DWg-1N-1. Shoot N uptake was biphasic and continued for 120 days. Leaf N accumulation was rapid until day 60. Specific leaf nitrogen (SLN) varied from 0.9 to 1.7gNm-2 green leaf area, a typical range for C4 grass canopies. Stem N increased to a maximum at day 120. NUE increased during development in parallel with increasing stem to leaf biomass ratio and as stems decreased from 0.7% to 0.2% N. At the end of the season, green leaves were ~1% N, represented 17% of total shoot biomass and accounted for 50% of N present in shoots (above ground biomass) while stems were ~0.2% N, comprised 83% of shoot biomass and accounted for 50% of shoot N. High NUE was due in part to N-remobilization from lower leaves and stem nodes/internodes to upper portions of the canopy. Up to 70% of dry weight and 90% of N was remobilized during senescence of lower leaves and 70% of N was remobilized from lower stem nodes/internodes. The NUE of energy sorghum was similar to Saccharum officinarum and Miscanthus x giganteus, and higher than grain Sorghum bicolor, Zea mays, and Panicum virgatum. High NUE of energy S. bicolor is due to long duration of vegetative growth, high stem to leaf biomass ratio, and very efficient N-remobilization from lower leaves and stem internodes during development.
Keyword Biomass
Energy crop
Nitrogen utilization efficiency
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
Institute for Molecular Bioscience - Publications
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Citation counts: TR Web of Science Citation Count  Cited 10 times in Thomson Reuters Web of Science Article | Citations
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