A physiological framework to explain genetic and environmental regulation of tillering in sorghum

Alam, Mohammad Mobashwer, Hammer, Graeme L., Van Oosterom, Erik J., Cruickshank, Alan W., Hunt, Colleen H. and Jordan, David R. (2014) A physiological framework to explain genetic and environmental regulation of tillering in sorghum. New Phytologist, 203 1: 155-167. doi:10.1111/nph.12767

Author Alam, Mohammad Mobashwer
Hammer, Graeme L.
Van Oosterom, Erik J.
Cruickshank, Alan W.
Hunt, Colleen H.
Jordan, David R.
Title A physiological framework to explain genetic and environmental regulation of tillering in sorghum
Journal name New Phytologist   Check publisher's open access policy
ISSN 1469-8137
Publication date 2014-07-01
Year available 2014
Sub-type Article (original research)
DOI 10.1111/nph.12767
Volume 203
Issue 1
Start page 155
End page 167
Total pages 13
Place of publication Oxford United Kingdom
Publisher Blackwell Publishing
Language eng
Formatted abstract
Tillering determines the plant size of sorghum (Sorghum bicolor) and an understanding of its regulation is important to match genotypes to prevalent growing conditions in target production environments. The aim of this study was to determine the physiological and environmental regulation of variability in tillering among sorghum genotypes, and to develop a framework for this regulation.

Diverse sorghum genotypes were grown in three experiments with contrasting temperature, radiation and plant density to create variation in tillering. Data on phenology, tillering, and leaf and plant size were collected. A carbohydrate supply/demand (S/D) index that incorporated environmental and genotypic parameters was developed to represent the effects of assimilate availability on tillering. Genotypic differences in tillering not explained by this index were defined as propensity to tiller (PTT) and probably represented hormonal effects.

Genotypic variation in tillering was associated with differences in leaf width, stem diameter and PTT. The S/D index captured most of the environmental effects on tillering and PTT most of the genotypic effects.

A framework that captures genetic and environmental regulation of tillering through assimilate availability and PTT was developed, and provides a basis for the development of a model that connects genetic control of tillering to its phenotypic consequences.
Keyword Carbon balance
Environmental control
Genetic diversity
Organ size
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Queensland Alliance for Agriculture and Food Innovation
Official 2015 Collection
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Citation counts: TR Web of Science Citation Count  Cited 10 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 11 times in Scopus Article | Citations
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