Author(s) |
Mwendia, S W
Yunusa, I A M
Sindel, B M
Whalley, R D B
Bruhl, J J
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Publication Date |
2019-01-30
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Abstract |
<p>The physiological response of two species of grasses with C<sub>3</sub> and C<sub>4</sub> mechanisms syndromes, Napier grass (<i>Pennisetum purpureum</i> Schumach × <i>Pennisetum glaucum</i> (L.) R. Br) and hydric common reed grass (<i>Phragmites australis</i> (Cav.) Trin. Ex Steud) was examined under ambient (aCO<sub>2</sub>) and elevated CO<sub>2</sub> (eCO<sub>2</sub>), in combination with water and temperature stress treatments. Under eCO<sub>2</sub> and subjected to water and temperature stress, the Napier grass maintained higher daytime leaf water potential (LWP) by reducing transpiration (<i>E</i>) and executing larger osmotic adjustment (OA) at an average of 0.85 MPa compared with 0.42 MPa for common reed; carbon assimilation (<i>P</i><sub>N</sub>) was thus higher for the Napier grass. Under aCO<sub>2</sub> and low temperature, water stress induced no significant differences in OA between the grasses, but Napier grass still had higher <i>P</i><sub>N</sub> than that of common reed. Recovery in LWP and <i>P</i><sub>N</sub> following re-watering of water-stressed plants was more rapid in Napier grass than that in the common reed; the former had also higher water-use efficiency due to its low specific water use (water use/leaf area) that was just a fraction (less than 6%) that of the common reed. Exposure of common reed to eCO<sub>2</sub> reduced stomata number, but increased it in the Napier grass, especially when subjected to water stress and high temperature. Exposure to eCO<sub>2</sub> enhanced OA capacity and <i>E</i> control in Napier grass resulting in superior physiological profile over the common reed subjected to water and heat stress.</p>
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Citation |
Photosynthetica, 57(1), p. 121-131
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ISSN |
1573-9058
0300-3604
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Link | |
Publisher |
Akademie Ved Ceske Republiky, Ustav Experimentalni Botaniky (Academy of Sciences of the Czech Republic, Institute of Experimental Botany)
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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Title |
Osmotic adjustment, stomata morphology and function show contrasting responses to water stress in mesic and hydric grasses under elevated CO2 concentration
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Type of document |
Journal Article
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Entity Type |
Publication
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Name | Size | format | Description | Link |
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openpublished/OsmoticYunusaSindelWhalleyBruhl2019JournalArticle.pdf | 754.835 KB | application/pdf | Published version | View document |