Academic Journal
CO 2 diffusion in tobacco: a link between mesophyll conductance and leaf anatomy
| العنوان: | CO 2 diffusion in tobacco: a link between mesophyll conductance and leaf anatomy |
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| المؤلفون: | Clarke, Victoria C., Danila, Florence R., von Caemmerer, Susanne |
| المساهمون: | Centre of Excellence in Translational Photosynthesis, Australian Research Council, Bill and Melinda Gates Foundation |
| المصدر: | Interface Focus ; volume 11, issue 2, page 20200040 ; ISSN 2042-8901 |
| بيانات النشر: | The Royal Society |
| سنة النشر: | 2021 |
| الوصف: | The partial pressure of CO 2 at the sites of carboxylation within chloroplasts depends on the conductance to CO 2 diffusion from intercellular airspace to the sites of carboxylation, termed mesophyll conductance ( g m ). We investigated how g m varies with leaf age and through a tobacco ( Nicotiana tabacum ) canopy by combining gas exchange and carbon isotope measurements using tunable diode laser spectroscopy. We combined these measurements with the anatomical characterization of leaves. CO 2 assimilation rate, A , and g m decreased as leaves aged and moved lower in the canopy and were linearly correlated. This was accompanied by large anatomical changes including an increase in leaf thickness. Chloroplast surface area exposed to the intercellular airspace per unit leaf area ( S c ) also decreased lower in the canopy. Older leaves had thicker mesophyll cell walls and g m was inversely proportional to cell wall thickness. We conclude that reduced g m of older leaves lower in the canopy was associated with a reduction in S c and a thickening of mesophyll cell walls. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1098/rsfs.2020.0040 |
| الاتاحة: | http://dx.doi.org/10.1098/rsfs.2020.0040 https://royalsocietypublishing.org/doi/pdf/10.1098/rsfs.2020.0040 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsfs.2020.0040 |
| Rights: | https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
| رقم الانضمام: | edsbas.5A98B9BD |
| قاعدة البيانات: | BASE |
| DOI: | 10.1098/rsfs.2020.0040 |
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