Regulation of tillering in sorghum: Environmental effects

Kim, Hae Koo, van Oosterom, Erik, Dingkuhn, Michael, Luquet, Delphine and Hammer, Graeme (2010) Regulation of tillering in sorghum: Environmental effects. Annals of Botany, 106 1: 57-67. doi:10.1093/aob/mcq079

Author Kim, Hae Koo
van Oosterom, Erik
Dingkuhn, Michael
Luquet, Delphine
Hammer, Graeme
Title Regulation of tillering in sorghum: Environmental effects
Journal name Annals of Botany   Check publisher's open access policy
ISSN 0305-7364
Publication date 2010-07
Sub-type Article (original research)
DOI 10.1093/aob/mcq079
Volume 106
Issue 1
Start page 57
End page 67
Total pages 11
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2011
Language eng
Formatted abstract
Background and Aims: Tillering has a significant effect on canopy development and, hence, on resource capture, crop growth and grain yield in sorghum. However, the physiological basis of tillering and its regulation by environmental effects are not fully understood. The objective of this study was to understand and quantify the environmental effects on tillering in sorghum using a carbohydrate supply-demand framework.

Methods: A series of five experiments with a wide range of radiation and temperature conditions was conducted and details of the tillering responses of a single representative hybrid were monitored. The concept of internal plant competition for carbohydrate was developed for analysis of these responses.

Key Results:
Tiller appearance was highly synchronized with main shoot leaf appearance, with a consistent hierarchy for tillering across environments. The main environmental effect was on the frequency of tiller appearance, in particular of the lower-rank tillers. This explained some of the observed environmental differences in the onset of tillering. A generalized index of internal plant competition, which took account of plant assimilate supply and demand (S/D index) during the critical period for tillering, explained most of the variation in maximum tiller number observed across the five experiments.

This result was consistent with the hypothesis that internal plant competition for assimilates regulates tillering in sorghum. Hence, the framework outlined has a predictive value that could provide the basis for dynamic simulation of tillering in crop growth models. © The Author 2010.
Keyword Carbohydrate supply-demand ratio
Internal plant competition
Leaf area development
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Agriculture and Food Sciences
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Citation counts: TR Web of Science Citation Count  Cited 26 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 11 Jul 2010, 00:09:33 EST