ABA and stomatal closure

 

 

Abscisic acid and stomatal closure: a hydraulic conductance conundrum?

by Dodd I. C. (2013)

in New Phytol, 197: 6–8. doi:10.1111/nph.12052 –

This article is corrected by: Errata: Corrigendum – Volume 198, Issue 4, 1290, Article first published online: 4 April 2013 – DOI: 10.1111/nph.12279(2013), Corrigendum. New Phytol, 198: 1290. doi:10.1111/nph.12279

http://onlinelibrary.wiley.com/doi/10.1111/nph.12052/abstract 

http://onlinelibrary.wiley.com/doi/10.1111/nph.12279/full

New Phytologist 197 (2013), 6–8.

Since its publication, it has been brought to our attention that some information presented in the commentary by Dodd (2013) is misleading and the work of Shatil-Cohen et al. (2011) was not appropriately acknowledged. The author has amended the text to clarify this.

In the third paragraph the text should read:

In contrast to previous reports where incubation of WT leaf mesophyll protoplasts in 1 μM ABA for 1–4 h had no significant effect on osmotic water permeability (Morillon & Chrispeels, 2001; Shatil-Cohen et al., 2011), incubating bundle sheath protoplasts in 1 μM ABA for 1 h decreased osmotic water permeability by c. 40% (Shatil-Cohen et al., 2011). This demonstrates that ionic regulation of different cell types is differentially responsive to ABA (Shatil-Cohen et al., 2011), which would interact with spatial differences in ABA concentration observed in different cell types (Christmann et al., 2007) in regulating hydraulic responses to ABA.

In the fifth paragraph the text should read:

See: http://onlinelibrary.wiley.com/doi/10.1111/nph.12279/full

Hormonal factors and stomatal behavior

 

Hormonal interactions and stomatal responses.

by Dodd I. C. (2003)

in J. Plant Growth Regul. 22, 32–46. doi: 10.1007/s00344-003-0023-x –

CrossRef Full Text | Google Scholar

http://link.springer.com/article/10.1007%2Fs00344-003-0023-x

Abstract

Both environmental and hormonal factors and their interactions affect stomatal behavior. Methodologies for identifying hormonal interactions affecting stomatal function are reviewed. Although there is abundant evidence that abscisic acid (ABA) closes stomata, evidence that the other classical plant hormones (auxins, cytokinins, ethylene, gibberellins) in isolation alter stomatal response often comes from exogenous applications to detached epidermes and leaves, rather than correlation of endogenous concentrations with stomatal conductance (g_s).

Evidence for hormonal interactions comes from isolated tissues with exogenous hormones supplied at nonphysiological concentrations, or from variation in stomatal response to xylem ABA concentration in planta.

The roles of hormonal changes in causing stomatal closure following changes in soil environment are considered. Although soil drying induces multiple changes in xylem sap composition, analysis of stomatal responses suggests a dominant role for increased endogenous ABA concentrations and relatively little evidence of roles for other hormones.

A similar picture emerges from studies of soil compaction. Although soil flooding decreases ABA export from the root system, there is some evidence that apoplastic ABA accumulation elicits stomatal closure.

Stomatal closure following nitrogen deprivation does not appear to involve ABA and may provide a suitable experimental system to investigate roles for other hormones. The availability of mutant or transgenic lines with altered hormone homeostasis or sensitivity provides opportunities to screen for altered stomatal behavior in response to different environments, and may provide new evidence that hormonal interactions are important in the control of stomatal behavior.

Stomata and hormones

 

 

Hormonal interactions and stomatal responses

by Dodd I. C. (2003)

– . Journal of Plant Growth Regulators 22: 32–46. – 

CrossRef, CAS

Signal transduction and second messengers –
http://plantcellbiology.masters.grkraj.org/html/Plant_Growth_And_Development4-Plant_Hormones-Gibberellins_files/image001.gif

Both environmental and hormonal factors and their interactions affect stomatal behavior. Methodologies for identifying hormonal interactions affecting stomatal function are reviewed.

Although there is abundant evidence that abscisic acid (ABA) closes stomata, evidence that the other classical plant hormones (auxins, cytokinins, ethylene, gibberellins) in isolation alter stomatal response often comes from exogenous applications to detached epidermis and leaves, rather than correlation of endogenous concns. with stomatal conductance (gs).

Evidence for hormonal interactions comes from isolated tissues with exogenous hormones supplied at nonphysiol. concns., or from variation in stomatal response to xylem ABA concentration in planta.

The roles of hormonal changes in causing stomatal closure following changes in soil environment are considered. Although soil drying induces multiple changes in xylem sap composition, anal. of stomatal responses suggests a dominant role for increased endogenous ABA concns. and relatively little evidence of roles for other hormones.

A similar picture emerges from studies of soil compaction. Although soil flooding decreases ABA export from the root system, there is some evidence that apoplastic ABA accumulation elicits stomatal closure.

Stomatal closure following nitrogen deprivation does not appear to involve ABA and may provide a suitable exptl. system to investigate roles for other hormones. The availability of mutant or transgenic lines with altered hormone homeostasis or sensitivity provides opportunities to screen for altered stomatal behavior in response to different environments, and may provide new evidence that hormonal interactions are important in the control of stomatal behavior.