Diverging temperature responses of CO2 assimilation and plant development explain the overall effect of temperature on biomass accumulation in wheat leaves and grains
| Autor: | Nicholas C. Collins, Iman Lohraseb, Boris Parent |
|---|---|
| Přispěvatelé: | Australian Centre for Plant Functional Genomics, School of Agriculture Food and Wine, University of Adelaide, Écophysiologie des Plantes sous Stress environnementaux (LEPSE), Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), FP7-613817 (MODEXTREME), Grains Research and Development Corporation (GRDC) project UA00123, European Project: 244374, Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine Plant growth Specific leaf area influence de la température Thermal time croissance foliaire Plant Science Biology Development Photosynthesis 01 natural sciences modèle de croissance 03 medical and health sciences Biomass Grain growth Respiration Temperature Wheat [SDV.BV]Life Sciences [q-bio]/Vegetal Biology Growth rate assimilation du carbone photosynthèse triticum aestivum 2. Zero hunger Vegetal Biology photosynthesis accumulation de biomasse fungi food and beverages Assimilation (biology) 15. Life on land Plant development 030104 developmental biology Agronomy Plant productivity surface foliaire spécifique écophysiologie végétale Biologie végétale 010606 plant biology & botany Research Article |
| Zdroj: | AoB Plants AoB Plants, 2017, ⟨10.1093/aobpla/plw092⟩ AoB Plants, Oxford University Press 2017, ⟨10.1093/aobpla/plw092⟩ AoB Plants, . (2017) |
| ISSN: | 2041-2851 |
| DOI: | 10.1093/aobpla/plw092⟩ |
| Popis: | Under rising temperature, the rate of any developmental process increased with temperature more rapidly than that of CO2 assimilation. We found that this discrepancy, summarised by the CO2 assimilation rate per unit of plant development, could explain the observed reductions in biomass accumulation in leaves and grain under high temperatures. This simple model describes the effects of night and day temperature equally well, and offers a simple framework for describing the effects of temperature on plant growth, without any supplementary effect of rising night temperatures. There is a growing consensus in the literature that rising temperatures influence the rates of biomass accumulation by shortening the development of plant organs and the whole plant and by altering the rates of respiration and photosynthesis. A model describing the net effects of these processes on biomass would be useful, but would need to reconcile reported differences in the effects of night and day temperature on plant productivity. In this study, the working hypothesis was that the temperature responses of CO2 assimilation and plant development rates were divergent, and that their net effects could explain observed differences in biomass accumulation. In wheat (Triticum aestivum) plants, we followed the temperature responses of photosynthesis, respiration and leaf elongation, and confirmed that their responses diverged. We measured the amount of carbon assimilated per ‘unit of plant development’ in each scenario and compared it to the biomass that accumulated in growing leaves and grains. Our results suggested that, up to a temperature optimum, the rate of any developmental process increased with temperature more rapidly than that of CO2 assimilation and that this discrepancy, summarised by the CO2 assimilation rate per unit of plant development, could explain the observed reductions in biomass accumulation in plant organs under high temperatures. The model described the effects of night and day temperature equally well, and offers a simple framework for describing the effects of temperature on plant growth. |
| Databáze: | OpenAIRE |
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