Journal article
Water availability moderates N-2 fixation benefit from elevated [CO2]: A 2-year free-air CO2 enrichment study on lentil (Lens culinaris MEDIK.) in a water limited agroecosystem
Plant, cell and environment, Vol.41(10), pp.2418-2434
10/2018
PMID: 29859018
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Source: InCites
Abstract
Increased biomass and yield of plants grown under elevated [CO2] often corresponds to decreased grain N concentration ([N]), diminishing nutritional quality of crops. Legumes through their symbiotic N2 fixation may be better able to maintain biomass [N] and grain [N] under elevated [CO2], provided N2 fixation is stimulated by elevated [CO2] in line with growth and yield. In Mediterranean-type agroecosystems, N2 fixation may be impaired by drought, and it is unclear whether elevated [CO2] stimulation of N2 fixation can overcome this impact in dry years. To address this question, we grew lentil under two [CO2] (ambient ~400 ppm and elevated ~550 ppm) levels in a free-air CO2 enrichment facility over two growing seasons sharply contrasting in rainfall.
Elevated [CO2] stimulated N2 fixation through greater nodule number (+27%), mass (+18%), and specific fixation activity (+17%), and this stimulation was greater in the high than in the low rainfall/dry season. Elevated [CO2] depressed grain [N] (−4%) in the dry season. In contrast, grain [N] increased (+3%) in the high rainfall season under elevated [CO2], as a consequence of greater post-flowering N2 fixation. Our results suggest that the benefit for N2 fixation from elevated [CO2] is high as long as there is enough soil water to continue N2 fixation during grain filling.
Details
- Title
- Water availability moderates N-2 fixation benefit from elevated [CO2]: A 2-year free-air CO2 enrichment study on lentil (Lens culinaris MEDIK.) in a water limited agroecosystem
- Creators
- Shahnaj Parvin - University of MelbourneShihab Uddin - Bangladesh Agricultural UniversityMaryse Bourgault - University of MelbourneUte Roessner - University of MelbourneSabine Tausz-Posch - University of MelbourneRoger Armstrong - La Trobe UniversityGarry O'Leary - Department of Economic Development Jobs Transport and ResourcesGlenn Fitzgerald - University of MelbourneMichael Tausz - University of Birmingham
- Publication Details
- Plant, cell and environment, Vol.41(10), pp.2418-2434
- Publisher
- Wiley
- Number of pages
- 17
- Grant note
- DAV00137 / Grain Research and Development Corporation; Grains R&D Corp FtRG1193982 / Australian Commonwealth Department of Agriculture and Water Resources
- Identifiers
- 991013099201702368
- Copyright
- © 2018 John Wiley & Sons Ltd.
- Academic Unit
- Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article