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Water availability moderates N2 fixation benefit from elevated [CO2 ]: A 2-year free-air CO2 enrichment study on lentil (Lens culinaris MEDIK.) in a water limited agroecosystem.
Parvin, Shahnaj; Uddin, Shihab; Bourgault, Maryse; Roessner, Ute; Tausz-Posch, Sabine; Armstrong, Roger; O'Leary, Garry; Fitzgerald, Glenn; Tausz, Michael.
Afiliación
  • Parvin S; School of Ecosystem and Forest Sciences, The University of Melbourne, Creswick, Victoria, Australia.
  • Uddin S; Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh.
  • Bourgault M; Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh.
  • Roessner U; Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Creswick, Victoria, Australia.
  • Tausz-Posch S; Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Creswick, Victoria, Australia.
  • Armstrong R; Northern Agricultural Research Centre, Montana State University, Havre, Montana, USA.
  • O'Leary G; School of Biosciences, The University of Melbourne, Parkville, Victoria, Australia.
  • Fitzgerald G; Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Creswick, Victoria, Australia.
  • Tausz M; School of Biosciences, University of Birmingham, Edgbaston, Birmingham, UK.
Plant Cell Environ ; 41(10): 2418-2434, 2018 10.
Article en En | MEDLINE | ID: mdl-29859018
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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dióxido de Carbono / Lens (Planta) / Fijación del Nitrógeno Idioma: En Revista: Plant Cell Environ Asunto de la revista: BOTANICA Año: 2018 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dióxido de Carbono / Lens (Planta) / Fijación del Nitrógeno Idioma: En Revista: Plant Cell Environ Asunto de la revista: BOTANICA Año: 2018 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Estados Unidos