Acclimation of leaf photosynthesis and respiration to warming in field-grown wheat
Autor: | Yong-Ling Ruan, Onoriode Coast, Oorbessy Gaju, Richard A. Richards, Bradley C Posch, Meiqin Lu, Helen Bramley, Owen K. Atkin, Richard Trethowan |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
0106 biological sciences
0301 basic medicine S1 Genotype Victoria Physiology Acclimatization Climate change Plant Science Biology Photosynthesis 01 natural sciences Global Warming Crop 03 medical and health sciences Respiration Triticum 2. Zero hunger Crop yield Temperature Sowing 15. Life on land Carbon Dioxide Oxygen Plant Leaves 030104 developmental biology Agronomy 13. Climate action Seeds Temperature response 010606 plant biology & botany |
ISSN: | 0140-7791 |
Popis: | Climate change and future warming will significantly affect crop yield. The capacity of crops to dynamically adjust physiological processes (i.e. acclimate) to warming might improve overall performance. Understanding and quantifying the degree of acclimation in field crops could ensure better parameterization of crop and Earth System models and predictions of crop performance. We hypothesized that for field-grown wheat, when measured at a common temperature (25°C), crops grown under warmer conditions would exhibit acclimation, leading to enhanced crop performance and yield. Acclimation was defined as: (i) decreased rates of net photosynthesis at 25°C (A25) coupled with lower maximum carboxylation capacity (Vcmax25); (ii) reduced leaf dark respiration at 25°C (both in terms of O2 consumption, Rdark_O225; and CO2 efflux, Rdark_CO225); and (iii) lower Rdark_CO225:Vcmax25. Field experiments were conducted over two seasons with 20 wheat genotypes, sown at three different planting dates, to test these hypotheses. Leaf-level CO2 based traits (A25, Rdark_CO225, and Vcmax25) did not show the classic acclimation responses that we hypothesized; by contrast, the hypothesized changes in Rdark_O2 were observed. These findings have implications for predictive crop models that assume similar temperature response among these physiological processes, and for predictions of crop performance in a future warmer world. |
Databáze: | OpenAIRE |
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