Drought resistance of bermudagrass (Cynodon spp.) ecotypes collected from different climatic zones

Zhou, Yi, Lambrides, Christopher J. and Fukai, Shu (2013) Drought resistance of bermudagrass (Cynodon spp.) ecotypes collected from different climatic zones. Environmental and Experimental Botany, 85 22-29. doi:10.1016/j.envexpbot.2012.07.008


Author Zhou, Yi
Lambrides, Christopher J.
Fukai, Shu
Title Drought resistance of bermudagrass (Cynodon spp.) ecotypes collected from different climatic zones
Journal name Environmental and Experimental Botany   Check publisher's open access policy
ISSN 0098-8472
1873-7307
Publication date 2013-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.envexpbot.2012.07.008
Volume 85
Start page 22
End page 29
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2013
Language eng
Formatted abstract
The objectives of this paper were to (1) evaluate drought resistance of a large number of bermudagrass ecotypes collected from different climatic zones of regional Australia and compare their performance to commercial cultivars, (2) describe the mechanisms of drought resistance observed, and (3) investigate the relationship between geographic origins of the ecotypes and their drought resistance. Fifty-two genotypes of bermudagrass were evaluated in two field experiments using lysimeters 40 cm deep. The grasses were grown in well-watered conditions and then a drought treatment was imposed by withholding water and excluding rainfall using a portable rain-out shelter. Two criteria were used to select for drought resistance, i.e. survival period (SP), defined as the number of days after water was withheld to the stage when 100% leaf firing had occurred and Days50 defined as the days required to reach 50% green cover. These experiments suggested that genotypes with superior drought resistance had lower stomatal conductance in the earlier phases of the dry-down period as suggested by less water use and higher canopy temperature depression. Lower water use during the early stage of dry-down resulted in more soil available water at the end of the drought period to extend green-leaf cover. There was no correlation between root dry matter and survival period/Days50. We also found some ecotypes performed better in drought conditions than popular commercial cultivars. There was no relationship between drought resistance and geographic origins, suggesting that drought resistant ecotypes could be obtained from any climatic zone sampled in this study.
Keyword Soil water content
Evapotranspiration
Canopy temperature
Root biomass
Turfgrass
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 2013 Collection
 
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