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Sorghum dwarfing genes can affect radiation capture and radiation use efficiency

George-Jaeggli, B. and Jordan, D. R. and Van Oosterom, E. J. and Broad, I. J. and Hammer, G. L. (2013) Sorghum dwarfing genes can affect radiation capture and radiation use efficiency. Field Crops Research, 149 . pp. 283-290. ISSN 03784290 (ISSN)

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Article Link(s): http://dx.doi.org/doi10.1016/j.fcr.2013.05.005

Abstract

Presence of the dw3 sorghum dwarfing gene had negative effects on grain yield in some genetic backgrounds and environments. In a previous study we showed that this was due to a significant reduction in shoot biomass (mainly via reduced stem mass), which in turn negatively affected grain size. The current study examines whether shoot biomass was reduced via effects of dw3 on traits associated with resource capture, such as leaf area index (LAI), light interception (LI), and canopy extinction coefficient (k) or with resource use efficiency, such as radiation use efficiency (RUE). Three pairs of near-isogenic sorghum lines differing only in the presence or absence of the dwarfing allele dw3 (3-dwarfs vs 2-dwarfs) were grown in large field plots. Biomass accumulation and LI were measured for individual canopy layers to examine canopy characteristics of tall and short types. Similar to the previously reported effects on grain yield, the effects of dw3 on RUE, LI and k varied among genetic backgrounds and environments. Interactions between dw3 and genetic background, but also interactions with environment are likely to have modulated the extent to which RUE, LI, or k contributed to biomass differences between tall and short sorghum. © 2013 .

Item Type:Article
Business groups:Crop and Food Science
Additional Information:Correspondence Address: George-Jaeggli, B.; Queensland Department of Agriculture, Fisheries and Forestry, Hermitage Research Facility, 604 Yangan Road, Warwick, Qld 4370, Australia; email: Barbara.George-Jaeggli@daff.qld.gov.au
Keywords:Light interception Plant height Radiation use efficiency Sorghum bicolor allele biomass biomass allocation crop yield leaf area index light use efficiency radiative forcing resource use shoot sorghum
Subjects:Plant culture > Field crops > Sorghum
Science > Biology > Genetics
Deposited On:01 Jul 2014 04:57
Last Modified:01 Jul 2014 04:57

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