Osmotic adjustment, stomata morphology and function show contrasting responses to water stress in mesic and hydric grasses under elevated CO2 concentration

Mwendia, S W; Yunusa, I A M; Sindel, B M; Whalley, R D B; Bruhl, J J

doi:10.32615/ps.2019.016

Author(s)

Mwendia, S W

Yunusa, I A M

Sindel, B M

Whalley, R D B

Bruhl, J J

Publication Date

2019-01-30

Abstract

The physiological response of two species of grasses with C3 and C4 mechanisms syndromes, Napier grass (Pennisetum purpureum Schumach × Pennisetum glaucum (L.) R. Br) and hydric common reed grass (Phragmites australis (Cav.) Trin. Ex Steud) was examined under ambient (aCO2) and elevated CO2 (eCO2), in combination with water and temperature stress treatments. Under eCO2 and subjected to water and temperature stress, the Napier grass maintained higher daytime leaf water potential (LWP) by reducing transpiration (E) and executing larger osmotic adjustment (OA) at an average of 0.85 MPa compared with 0.42 MPa for common reed; carbon assimilation (PN) was thus higher for the Napier grass. Under aCO2 and low temperature, water stress induced no significant differences in OA between the grasses, but Napier grass still had higher PN than that of common reed. Recovery in LWP and PN 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 eCO2 reduced stomata number, but increased it in the Napier grass, especially when subjected to water stress and high temperature. Exposure to eCO2 enhanced OA capacity and E control in Napier grass resulting in superior physiological profile over the common reed subjected to water and heat stress.

Citation

Photosynthetica, 57(1), p. 121-131

ISSN

1573-9058

0300-3604

Link

https://hdl.handle.net/1959.11/47819

Language

en

Publisher

Akademie Ved Ceske Republiky, Ustav Experimentalni Botaniky (Academy of Sciences of the Czech Republic, Institute of Experimental Botany)

Rights

Attribution-NonCommercial-NoDerivatives 4.0 International

Title

Osmotic adjustment, stomata morphology and function show contrasting responses to water stress in mesic and hydric grasses under elevated CO2 concentration

Type of document

Journal Article

Entity Type

Publication

Author(s)	Mwendia, S W Yunusa, I A M Sindel, B M Whalley, R D B Bruhl, J J
Publication Date	2019-01-30
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>
Citation	Photosynthetica, 57(1), p. 121-131
ISSN	1573-9058 0300-3604
Link	https://hdl.handle.net/1959.11/47819
Language	en
Publisher	Akademie Ved Ceske Republiky, Ustav Experimentalni Botaniky (Academy of Sciences of the Czech Republic, Institute of Experimental Botany)
Rights	Attribution-NonCommercial-NoDerivatives 4.0 International
Title	Osmotic adjustment, stomata morphology and function show contrasting responses to water stress in mesic and hydric grasses under elevated CO2 concentration
Type of document	Journal Article
Entity Type	Publication

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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