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

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conference contribution
posted on 2023-05-23, 10:20 authored by Carina Moeller, Evers, JB, Rebetzke, GJ
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.


Publication title

Proceedings of the17th Australian Society of Agronomy Conference


T Acuna, M Harrison, C Moeller, D Parsons




Tasmanian Institute of Agriculture (TIA)


Australian Society of Agronomy

Place of publication


Event title

17th Australian Society of Agronomy Conference

Event Venue

Hobart, Australia

Date of Event (Start Date)


Date of Event (End Date)


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Copyright 2015 the author

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  • Open

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