| Autor: |
Jayawardena DM; Department of Environmental Sciences, University of Toledo, Toledo, OH 43606, USA., Heckathorn SA; Department of Environmental Sciences, University of Toledo, Toledo, OH 43606, USA., Rajanayake KK; Department of Chemistry and Biochemistry, University of Toledo, Toledo, OH 43606, USA., Boldt JK; U.S. Department of Agriculture, Agricultural Research Service, Toledo, OH 43606, USA., Isailovic D; Department of Chemistry and Biochemistry, University of Toledo, Toledo, OH 43606, USA. |
| Jazyk: |
angličtina |
| Zdroj: |
Plants (Basel, Switzerland) [Plants (Basel)] 2021 Apr 08; Vol. 10 (4). Date of Electronic Publication: 2021 Apr 08. |
| DOI: |
10.3390/plants10040722 |
| Abstrakt: |
The response of plant N relations to the combination of elevated CO 2 (eCO 2 ) and warming are poorly understood. To study this, tomato ( Solanum lycopersicum ) plants were grown at 400 or 700 ppm CO 2 and 33/28 or 38/33 °C (day/night), and their soil was labeled with 15 NO 3 - or 15 NH 4 + . Plant dry mass, root N-uptake rate, root-to-shoot net N translocation, whole-plant N assimilation, and root resource availability (%C, %N, total nonstructural carbohydrates) were measured. Relative to eCO 2 or warming alone, eCO 2 + warming decreased growth, NO 3 - and NH 4 + -uptake rates, root-to-shoot net N translocation, and whole-plant N assimilation. Decreased N assimilation with eCO 2 + warming was driven mostly by inhibition of NO 3 - assimilation, and was not associated with root resource limitations or damage to N-assimilatory proteins. Previously, we showed in tomato that eCO 2 + warming decreases the concentration of N-uptake and -assimilatory proteins in roots, and dramatically increases leaf angle, which decreases whole-plant light capture and, hence, photosynthesis and growth. Thus, decreases in N uptake and assimilation with eCO 2 + warming in tomato are likely due to reduced plant N demand. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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