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Temporal and spatial patterns of soil water extraction and drought resistance among genotypes of a perennial C-4 grass

Zhou, Y. and Lambrides, C. J. and Roche, M. B. and Duff, A. and Fukai, S. (2013) Temporal and spatial patterns of soil water extraction and drought resistance among genotypes of a perennial C-4 grass. Functional Plant Biology, 40 (4). pp. 379-392. ISSN 1445-4408

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Article Link(s): http://dx.doi.org/10.1071/fp12270

Abstract

The objective of this study was to investigate patterns of soil water extraction and drought resistance among genotypes of bermudagrass (Cynodon spp.) a perennial C-4 grass. Four wild Australian ecotypes (1-1, 25a1, 40-1, and 81-1) and four cultivars (CT2, Grand Prix, Legend, and Wintergreen) were examined in field experiments with rainfall excluded to monitor soil water extraction at 30-190 cm depths. In the study we defined drought resistance as the ability to maintain green canopy cover under drought. The most drought resistant genotypes (40-1 and 25a1) maintained more green cover (55-85% vs 5-10%) during water deficit and extracted more soil water (120-160 mm vs 77-107 mm) than drought sensitive genotypes, especially at depths from 50 to 110 cm, though all genotypes extracted water to 190 cm. The maintenance of green cover and higher soil water extraction were associated with higher stomatal conductance, photosynthetic rate and relative water content. For all genotypes, the pattern of water use as a percentage of total water use was similar across depth and time We propose the observed genetic variation was related to different root characteristics (root length density, hydraulic conductivity, root activity) although shoot sensitivity to drying soil cannot be ruled out.

Item Type:Article
Business groups:Crop and Food Science
Additional Information:Zhou, Yi Lambrides, Christopher J. Roche, Matthew B. Duff, Alan Fukai, Shu Australian Research Council (ARC) [LP0775239] This project was supported by the Australian Research Council (ARC) linkage project (EcoTurf; ID: LP0775239). We are grateful to the staff from Redlands Research Station of The Department of Agriculture, Fisheries and Forestry helping manage the experiments. We also acknowledge our industry partners Jimboomba Turf Group Pty Ltd, South East Queensland Council of Mayors and Department of Agriculture, Fisheries and Forestry. Csiro publishing Collingwood
Keywords:drought tolerance green couch grass turfgrass water use warm-season turfgrasses grain-sorghum tall fescue subhumid environment kentucky bluegrass cynodon spp. responses growth avoidance plant
Subjects:Plant culture > Lawns and turfgrasses
Plant culture > Irrigation farming
Agriculture > Agriculture (General) > Soils. Soil science
Deposited On:21 Aug 2014 00:46
Last Modified:21 Aug 2014 00:46

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