A quantitative genetics approach to nitrogen use efficiency in sugarcane

Whan, Alex, Robinson, Nicole, Lakshmanan, Prakash, Schmidt, Susanne and Aitken, Karen (2010) A quantitative genetics approach to nitrogen use efficiency in sugarcane. Functional Plant Biology, 37 5: 448-454.


Author Whan, Alex
Robinson, Nicole
Lakshmanan, Prakash
Schmidt, Susanne
Aitken, Karen
Title A quantitative genetics approach to nitrogen use efficiency in sugarcane
Journal name Functional Plant Biology   Check publisher's open access policy
ISSN 1445-4408
1445-4416
Publication date 2010-04-30
Sub-type Article (original research)
DOI 10.1071/FP09260
Volume 37
Issue 5
Start page 448
End page 454
Total pages 7
Editor Rana Munns
Place of publication Melbourne, Australia
Publisher CSIRO
Collection year 2011
Language eng
Subject C1
829899 Environmentally Sustainable Plant Production not elsewhere classified
060705 Plant Physiology
Formatted abstract The economic and environmental consequences of inefficient use of nitrogen (N) fertiliser in agricultural crops is of concern worldwide, so new crop varieties with improved nitrogen use efficiency (NUE) are sought. Here, we report the first study of mapping quantitative trait loci (QTL) for nitrogen physiology traits in sugarcane. QTL analysis was undertaken for each parent of a segregating bi-parental sugarcane mapping population. We grew 168 progeny under limiting (0.2 mM NH4NO3) and non-limiting (5.0 mM NH4NO3) N supplies in two glasshouse experiments. Significant marker-trait associations (MTA) were detected in each treatment for shoot dry weight, root dry weight, total shoot N, shoot internal NUE (iNUE; measured as units shoot dry weight per unit N), leaf protein content and glutamine synthetase (GS) activity. MTA for GS activity did not co-locate with other traits except leaf protein content, indicating that variation in GS activity is not linked to plant size or iNUE during early growth. Under high N, there were no significant MTA for iNUE among markers from the male parent, Q165, an Australian commercial cultivar, but six MTA were found for markers inherited from the female parent, IJ76–514, a Saccharum officinarum ancestral variety. The results indicate that variation for iNUE under high N may be lower in commercial varieties than unimproved genotypes. Further, four MTA were consistent with previous field-based research on sugar and biomass production. Our study provides initial evidence that QTL may be incorporated in sugarcane breeding programs targeting improved NUE.
© CSIRO 2010

Keyword Glutamine synthetase
NUE
QTL
Trait loci
Saccharum Spp.
Yield
Identification
Cultivar
Linkage
Maize
Soils
QTLs
Dissection
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 Biological Sciences Publications
 
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Created: Sun, 16 May 2010, 00:06:17 EST