Modelling the dynamics and phenotypic consequences of tiller outgrowth and cessation in sorghum

Hammer, G L and McLean, G and Kholova, J and Oosterom, E van (2023) Modelling the dynamics and phenotypic consequences of tiller outgrowth and cessation in sorghum. in silico Plants, 5 (2). pp. 1-14. ISSN 2517-5025

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Abstract

Tillering affects canopy leaf area, and hence crop growth via capture of light, water and nutrients. Depending on the season, variation in tillering can result in increased or decreased yield. Reduced tillering has been associated with water-saving and enhanced yield in water-limited conditions. The objective of this study was to develop a generic model of the dynamics of tillering in sorghum incorporating key genetic and environmental controls. The dynamic of tillering was defined in four key phases—pre-tillering, tiller emergence, cessation of tiller emergence and cessation of tiller growth. Tillering commenced at full expansion of leaf four and thereafter was synchronized with leaf appearance. The potential total number of tillers (TTN) was dependent on a genetic propensity to tiller and an index of assimilate availability dependent on the shoot source–sink balance. Cessation of tiller emergence could occur before TTN depending on extent of competition from neighbours. Subsequent cessation of growth of emerged tillers was related to the extent of internal competition for assimilate among plant organs, resulting in prediction of final fertile tiller number (FTN). The model predicted tillering dynamics well in an experiment with a range in plant density. Plausibility simulations of FTN conducted for diverse field conditions in the Australian sorghum belt reflected expectations. The model is able to predict FTN as an emergent property. Its utility to explore GxMxE crop adaptation landscapes, guide molecular discovery, provide a generic template for other cereals and link to advanced methods for enhancing genetic gain in crops were discussed.

Item Type:	Article
Divisions:	Global Research Program - Accelerated Crop Improvement
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Adaptation, dynamics, model, tillering, simulation, sorghum
Subjects:	Others > Cereals Mandate crops > Sorghum
Depositing User:	Mr Nagaraju T
Date Deposited:	29 Feb 2024 06:13
Last Modified:	29 Feb 2024 06:13
URI:	http://oar.icrisat.org/id/eprint/12521
Official URL:	https://academic.oup.com/insilicoplants/article/5/...
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	The contributions of Graeme Hammer, Greg McLean and Erik van Oosterom were supported by the Australian Research Council Centre of Excellence for Plant Success in Nature and Agriculture (CE200100015). The contribution of Jana Kholova was supported by a grant of the Faculty of Economics and Management, Czech University of Life Sciences Prague (grant no. 2023B0005; Oborově zaměřené datové modely pro podporu iniciativy Open Science a principů FAIR). The authors thank Paula Demarco for Fig. 1 and anonymous reviewers for suggesting Figs 4 and 7.
Links:	Google Scholar

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