Genetic control of nodal root angle in sorghum and its implications on water extraction

Singh, Vijaya, van Oosterom, Erik J., Jordan, David R. and Hammer, Graeme L. (2012) Genetic control of nodal root angle in sorghum and its implications on water extraction. European Journal of Agronomy, 42 3-10. doi:10.1016/j.eja.2012.04.006

Author Singh, Vijaya
van Oosterom, Erik J.
Jordan, David R.
Hammer, Graeme L.
Title Genetic control of nodal root angle in sorghum and its implications on water extraction
Journal name European Journal of Agronomy   Check publisher's open access policy
ISSN 1161-0301
Publication date 2012-10
Sub-type Article (original research)
DOI 10.1016/j.eja.2012.04.006
Volume 42
Start page 3
End page 10
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2013
Language eng
Abstract Genotypic variability in root system architecture has been associated with root angle of seedlings and water extraction patterns of mature plants in a range of crops. The potential inclusion of root angle as a selection criterion in a sorghum breeding program requires (1) availability of an efficient screening method, (2) presence of genotypic variation with high heritability, and (3) an association with water extraction pattern. The aim of this study was to determine the feasibility for inclusion of nodal root angle as a selection criterion in sorghum breeding programs. A high-throughput phenotypic screen for nodal root angle in young sorghum plants has recently been developed and has been used successfully to identify significant variation in nodal root angle across a diverse range of inbred lines and a mapping population. In both cases, heritabilities for nodal root angle were high. No association between nodal root angle and plant size was detected. This implies that parental inbred lines could potentially be used to asses nodal root angle of their hybrids, although such predictability is compromised by significant interactions. To study effects of nodal root angle on water extraction patterns of mature plants, four inbred lines with contrasting nodal root angle at seedling stage were grown until at least anthesis in large rhizotrons. A consistent trend was observed that nodal root angle may affect the spatial distribution of root mass of mature plants and hence their ability to extract soil water, although genotypic differences were not significant. The potential implications of this for specific adaptation to drought stress are discussed. Results suggest that nodal root angle of young plants can be a useful selection criterion for specific drought adaptation, and could potentially be used in molecular breeding programs if QTLs for root angle can be identified.
Keyword Breeding
Drought adaptation
Root angle
Root system
Water extraction
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes "Designing Crops for new challenges"

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Queensland Alliance for Agriculture and Food Innovation
Official 2013 Collection
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 19 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Thu, 15 Nov 2012, 15:18:03 EST by System User on behalf of School of Agriculture and Food Sciences