High biomass yield energy sorghum: developing a genetic model for C4 grass bioenergy crops

Olson, Sara N., Ritter, Kimberley, Rooney, William, Kemanian, Armen, McCarl, Bruce A., Zhang, Yuquan, Hall, Susan, Packer, Dan and Mullet, John (2012) High biomass yield energy sorghum: developing a genetic model for C4 grass bioenergy crops. Biofuels, Bioproducts and Biorefining, 6 6: 640-655. doi:10.1002/bbb.1357

Author Olson, Sara N.
Ritter, Kimberley
Rooney, William
Kemanian, Armen
McCarl, Bruce A.
Zhang, Yuquan
Hall, Susan
Packer, Dan
Mullet, John
Title High biomass yield energy sorghum: developing a genetic model for C4 grass bioenergy crops
Journal name Biofuels, Bioproducts and Biorefining   Check publisher's open access policy
ISSN 1932-104X
Publication date 2012-11-01
Sub-type Article (original research)
DOI 10.1002/bbb.1357
Open Access Status Not yet assessed
Volume 6
Issue 6
Start page 640
End page 655
Total pages 16
Place of publication Chichester, West Sussex, United Kingdom
Publisher John Wiley & Sons
Language eng
Subject 2105 Renewable Energy, Sustainability and the Environment
1502 Banking, Finance and Investment
Formatted abstract
A first-generation energy sorghum hybrid with enhanced photoperiod sensitivity and long growth duration accumulated more than twice as much biomass as grain sorghum. The energy sorghum produced more leaves (~45 vs 17-20), longer stems (~4 vs 1.5 meters) and had a higher stem-to-leaf biomass ratio than grain sorghum. At the end of the season, energy sorghum stems represented 83% of the plant's shoot biomass. The greater biomass accumulation was due to longer growth duration, a higher leaf area index, greater radiation interception, and higher radiation use efficiency. When grown under dryland or limited irrigation conditions, the rate of biomass accumulation by the energy sorghum hybrid was reduced in mid-season. This decrease was most apparent in August due to summer water deficit; however plants recovered when rain occurred in September. Crop growth modeling and biomass accumulation rates measured under optimal field conditions show that energy sorghum, like other C4 energy grasses, has excellent biomass yield potential. The greenhouse gas offset values of energy sorghum hybrids, grown in large and small field plots, and under fully irrigated and dryland conditions, ranged from 63-78% for cellulosic ethanol production and 88-95% for power generation. This study shows that drought-tolerant, annual energy sorghum hybrids have the genetic yield potential to contribute significantly to bioenergy production. Sorghum is a genetically tractable, diverse species with a good genomics platform, making energy sorghum a promising genetic model for the design of C4 grass energy crops.
Keyword Bioenergy
Growth model
Radiation use efficiency
Greenhouse gas offset
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Institute for Molecular Bioscience - Publications
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Citation counts: TR Web of Science Citation Count  Cited 30 times in Thomson Reuters Web of Science Article | Citations
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