Journal article
Water use dynamics of dryland canola (Brassica napus L.) grown on contrasting soils under elevated CO2
Plant and soil, Vol.438, pp.205-222
09/03/2019
Metrics
11 Record Views
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: InCites
Abstract
Background and aims
Increasing atmospheric carbon dioxide concentration ([CO2]) stimulates the leaf-level (intrinsic) water use efficiency (iWUE), which may mitigate the adverse effects of drought by lowering water use in plants. This study investigated the interactive effect of [CO2] and soil type on growth, yield and water use of canola (Brassica napus L.) in a dryland environment.
Methods
Two canola cultivars (vigorous hybrid cv. ‘Hyola 50’ and non-hybrid cv. ‘Thumper’) were grown in large intact soil cores containing either a sandy Calcarosol or clay Vertosol under current ambient (a[CO2]) and future elevated [CO2] (e[CO2]), ∼550 μmol mol−1). Net assimilation rates (Anet), stomatal conductance (gs) and leaf area were measured throughout the growing season. Seed yield and yield components were recorded at final harvest. Water use was monitored by lysimeter balances.
Results
Elevated [CO2]-stimulation of iWUE was greater than the effect on leaf area, therefore, water use was lower under e[CO2] than a[CO2], but this was further modified by soil type and cultivar. The dynamics of water use throughout the growing season were different between the studied cultivars and in line with their leaf development. The effect of e[CO2] on seed yield was dependent on cultivar; the non-hybrid cultivar benefitted more from increased [CO2]. Although textural differences between soil types influenced the water use under e[CO2], this did not affect the ‘CO2 fertilisation effect’ on the studied canola cultivars.
Conclusion
Elevated [CO2]-induced water savings observed in the present study is a potential mechanism of ameliorating drought effects in high CO2 environment. Better understanding of genotypic variability in response to water use dynamics with traits affecting assimilate supply and use can help breeders to improve crop germplasm for future climates.
Details
- Title
- Water use dynamics of dryland canola (Brassica napus L.) grown on contrasting soils under elevated CO2
- Creators
- Shihab Uddin - NSW Department of Primary IndustriesShahnaj Parvin - Bangladesh Agricultural UniversityMarkus Low - University of MelbourneGlenn J. Fitzgerald - University of MelbourneSabine Tausz-Posch - University of MelbourneRoger Armstrong - La Trobe UniversityMichael Tausz - Central Queensland University
- Publication Details
- Plant and soil, Vol.438, pp.205-222
- Publisher
- Springer Nature
- Number of pages
- 18
- Grant note
- Grains Research and Development Corporation; Grains R&D Corp Melbourne International Research Scholarship Australian Department of Agriculture and Water Resources; Australian Government
- Identifiers
- 991013099012402368
- Copyright
- (c) Springer Nature Switzerland AG 2019.
- Academic Unit
- Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article