Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 1-9 |
| Journal | Environmental and Experimental Botany |
| Volume | 143 |
| DOIs | |
| Publication status | Published - 2017 |
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Keywords
- Abscisic acid
- Rosa × hybrida
- Salt stress
- Stomatal physiology
- Vapor pressure deficit
- Water loss
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Moderate salinity improves stomatal functioning in rose plants grown at high relative air humidity. / Carvalho, Dália R.A.; Vasconcelos, Marta W.; Lee, Sang; Vreugdenhil, Dick; Heuvelink, Ep; Pinto de Carvalho, Susana.
In: Environmental and Experimental Botany, Vol. 143, 2017, p. 1-9.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Moderate salinity improves stomatal functioning in rose plants grown at high relative air humidity
AU - Carvalho, Dália R.A.
AU - Vasconcelos, Marta W.
AU - Lee, Sang
AU - Vreugdenhil, Dick
AU - Heuvelink, Ep
AU - Pinto de Carvalho, Susana
PY - 2017
Y1 - 2017
N2 - Plants grown at high relative air humidity (RH ≥ 85%) show hampered stomatal closure in response to closing stimuli. We hypothesized that a moderate salinity during growth could trigger a stress response and stimulate stomatal functioning due to an increased leaf abscisic acid concentration ([ABA]). Cut rose ‘Prophyta’ was grown at moderate (63%) or high (89%) RH combined with three electrical conductivities (EC) in the nutrient solution (2, 4 and 6 dS m−1; adding NaCl). High RH resulted in higher pore area per leaf area in intact leaves, and higher stomatal conductance (gs) both in leaves subjected to desiccation and to light/dark transition, as compared to moderate RH. Increasing EC in high RH-grown plants lead to higher stomatal density but it enhanced stomatal closure in response to leaflet desiccation. This enhanced stomatal functioning was associated with increased [ABA] and [ABA + metabolites]. Nonetheless, plants grown at EC6 showed a significantly lower chlorophyll content, total plant dry weight and total leaf area. This negative effect on plant growth is related to ionic stress as the sodium and chloride concentrations increased in plants grown at EC6 compared to EC2 (up to 111- and 14-fold, respectively). This is the first study on the interactive effects of RH and salinity on stomatal functioning and anatomy during leaf development. It is shown that, when these two environmental factors that influence stomatal responsiveness in an opposite way are combined, moderate EC is able to improve stomatal responsiveness to leaflet desiccation in high RH-grown plants due to increased leaf [ABA].
AB - Plants grown at high relative air humidity (RH ≥ 85%) show hampered stomatal closure in response to closing stimuli. We hypothesized that a moderate salinity during growth could trigger a stress response and stimulate stomatal functioning due to an increased leaf abscisic acid concentration ([ABA]). Cut rose ‘Prophyta’ was grown at moderate (63%) or high (89%) RH combined with three electrical conductivities (EC) in the nutrient solution (2, 4 and 6 dS m−1; adding NaCl). High RH resulted in higher pore area per leaf area in intact leaves, and higher stomatal conductance (gs) both in leaves subjected to desiccation and to light/dark transition, as compared to moderate RH. Increasing EC in high RH-grown plants lead to higher stomatal density but it enhanced stomatal closure in response to leaflet desiccation. This enhanced stomatal functioning was associated with increased [ABA] and [ABA + metabolites]. Nonetheless, plants grown at EC6 showed a significantly lower chlorophyll content, total plant dry weight and total leaf area. This negative effect on plant growth is related to ionic stress as the sodium and chloride concentrations increased in plants grown at EC6 compared to EC2 (up to 111- and 14-fold, respectively). This is the first study on the interactive effects of RH and salinity on stomatal functioning and anatomy during leaf development. It is shown that, when these two environmental factors that influence stomatal responsiveness in an opposite way are combined, moderate EC is able to improve stomatal responsiveness to leaflet desiccation in high RH-grown plants due to increased leaf [ABA].
KW - Abscisic acid
KW - Rosa × hybrida
KW - Salt stress
KW - Stomatal physiology
KW - Vapor pressure deficit
KW - Water loss
U2 - 10.1016/j.envexpbot.2017.07.018
DO - 10.1016/j.envexpbot.2017.07.018
M3 - Article
VL - 143
SP - 1
EP - 9
JO - Environmental and Experimental Botany
JF - Environmental and Experimental Botany
SN - 0098-8472
ER -