Developmental and physiological traits associated with high yield and stay-green phenotype in wheat

ChristopherJT, ManschadiAM, HammerGL, BorrellAK and JennyCFegent (2008) Developmental and physiological traits associated with high yield and stay-green phenotype in wheat. Australian Journal of Agicultural Research, 59 4: 354-364. doi:10.1071/AR07193


Author ChristopherJT
ManschadiAM
HammerGL
BorrellAK
JennyCFegent
Title Developmental and physiological traits associated with high yield and stay-green phenotype in wheat
Journal name Australian Journal of Agicultural Research   Check publisher's open access policy
ISSN 1836-0947
Publication date 2008-04-08
Year available 2008
Sub-type Article (original research)
DOI 10.1071/AR07193
Open Access Status
Volume 59
Issue 4
Start page 354
End page 364
Total pages 11
Place of publication Collingwood, VIC, Australia
Publisher CSIRO Publishing
Language eng
Subject C1
820507 Wheat
070303 Crop and Pasture Biochemistry and Physiology
Abstract Water availability is a key limiting factor in wheat production in the northern grain belt of Australia. Varieties with improved adaptation to such conditions are actively sought. The CIMMYT wheat line SeriM82 has shown a significant yield advantage in multi-environment screening trials in this region. The objective of this study was to identify the physiological basis of the adaptive traits underpinning this advantage. Six detailed experiments were conducted to compare the growth, development, and yield of SeriM82 with that of the adapted cultivar, Hartog. The experiments were undertaken in field environments that represented the range of moisture availability conditions commonly encountered by winter crops grown on the deep Vertosol soils of this region. The yield of SeriM82 was 6–28% greater than that of Hartog, and SeriM82 exhibited a stay-green phenotype by maintaining green leaf area longer during the grain-filling period in all environments where yield was significantly greater than Hartog. However, where the availability of deep soil moisture was limited, SeriM82 failed to exhibit significantly greater yield or to express the stay-green phenotype. Thus, the stay-green phenotype was closely associated with the yield advantage of SeriM82. SeriM82 also exhibited higher mean grain mass than Hartog in all environments. It is suggested that small differences in water use before anthesis, or greater water extraction from depth after anthesis, could underlie the stay-green phenotype. The inability of SeriM82 to exhibit stay-green and higher yield where deep soil moisture was depleted indicates that extraction of deep soil moisture is important.
Keyword drought adaptation
SeriM82
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Agriculture and Food Sciences
 
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Created: Mon, 20 Apr 2009, 01:01:10 EST by Emma Cushworth on behalf of School of Land, Crop and Food Sciences