Drought resistance and soil water extraction of a perennial C4 grass: contributions of root and rhizome traits

Zhou, Yi, Lambrides, Christopher J. and Fukai, Shu (2014) Drought resistance and soil water extraction of a perennial C4 grass: contributions of root and rhizome traits. Functional Plant Biology, 41 5: 505-519. doi:10.1071/FP13249


Author Zhou, Yi
Lambrides, Christopher J.
Fukai, Shu
Title Drought resistance and soil water extraction of a perennial C4 grass: contributions of root and rhizome traits
Formatted title
Drought resistance and soil water extraction of a perennial C4 grass: contributions of root and rhizome traits
Journal name Functional Plant Biology   Check publisher's open access policy
ISSN 1445-4408
1445-4416
Publication date 2014-04
Year available 2014
Sub-type Article (original research)
DOI 10.1071/FP13249
Open Access Status
Volume 41
Issue 5
Start page 505
End page 519
Total pages 15
Place of publication Collingwood, VIC, Australia
Publisher C S I R O Publishing
Collection year 2015
Language eng
Formatted abstract
Previously, we showed that genotypic differences in soil water extraction were associated with drought response, but we did not study underground root and rhizome characteristics. In this study, we demonstrate a similar relationship between drought resistance and soil water extraction but investigate the role of underground organs. Eighteen bermudagrass genotypes (Cynodon spp.) from four climatic zones were assessed under continuous drought at two locations with contrasting soils and climates. The criterion for drought resistance was the duration required to reach 50% green cover (GC50) after water was withheld. GC50, physiological traits, rhizome dry matter (RhDM), root length density (RLD) and average root diameter (ARD) were determined in both locations; water extraction was measured in one location. Large genotypic variation for drought resistance was observed in both locations, with GC50 being 187–277 days in a clay soil and 15–27 days in a sandy soil. Drought-resistant genotypes had greater soil water extraction and a higher water uptake rate. GC50 was correlated with relative water content (r = 0.76), canopy temperature differential (r = –0.94) and photosynthetic rate (r = 0.87) measured during drought; RhDM (r = 0.78 to ~0.93) before and after drought; and ARD after drought (r = 0.82 to ~0.94); GC50 was not correlated with RLD. Ecotypes collected from the Australian Mediterranean zone had superior drought resistance and were characterised by a large rhizome network. This is the first comprehensive study with perennial C4 grasses describing the association between water extraction, root distribution, rhizomes and drought resistance.
Keyword Bermuda grass
Canopy temperature
Cynodon
Root length density.
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
Official 2015 Collection
 
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