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3D modelling of tillering behaviour and light interception of freely (-tin) and restricted (+tin) tillering wheat near-isolines


Moeller, C and Evers, JB and Rebetzke, GJ, 3D modelling of tillering behaviour and light interception of freely (-tin) and restricted (+tin) tillering wheat near-isolines, Proceedings of the17th Australian Society of Agronomy Conference, 20-24 September 2015, Hobart, Australia, pp. 1-4. (2015) [Refereed Conference Paper]


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A functional-structural plant model of wheat architecture was parameterised to simulate a pair of lines varying for a tiller inhibition (tin) gene. Effects of planting configuration were explored through red : far-red (R:FR) signalling on tiller production, final spike numbers, and light interception. Both increased plant density (125 to 200 plants/m2) and row spacing (20 to 30 cm) reduced the simulated tiller and spike numbers per plant in both lines. This reduction was greater in the free-tillering (tin) than in the reduced-tillering (+tin) line. At wider row spacing of 30 cm, simulated radiation interception was less in the +tin line than in the tin line from about 60 days after sowing onwards. In the +tin line, increased R:FR signalling between individual plants due to less within-row spacing at wider rows resulted in reduced spikes/m2 irrespective of population density. Spikes/m2 simulated for the tin line were similar at either row spacing in a population of 125 plants/m2, but decreased with wider row spacing at the higher density of 200 plants/m2. For both lines, the greatest number of tillers and ultimately spikes per m2 was simulated at a density of 200 plants/m2 and 20 cm row spacing (tin: 820 spikes/m2; +tin: 570 spikes/m2). The simulations indicated that growing +tin wheat at an increased density of 200 plants/m2 and 20 cm row spacing can produce similar, or greater, spikes/m2 compared to tin wheat grown at a density of 125 plants/m2.

Item Details

Item Type:Refereed Conference Paper
Keywords:Functional Structural Plant Model, wheat, tillering, canopy architecture, plant density, row spacing
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Crop and Pasture Biochemistry and Physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Winter Grains and Oilseeds
Objective Field:Wheat
UTAS Author:Moeller, C (Dr Carina Moeller)
ID Code:102996
Year Published:2015
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2015-09-15
Last Modified:2016-05-09
Downloads:185 View Download Statistics

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