The question as to what triggers stomatal closure during leaf desiccation remains controversial. This paper examines characteristics of the vascular and photosynthetic functions of the leaf to determine which responds most similarly to stomata during desiccation. Leaf hydraulic conductance (Kleaf) was measured from the relaxation kinetics of leaf water potential (l), and a novel application of this technique allowed the response of Kleaf to l to be determined. These ?vulnerability curves? show that Kleaf is highly sensitive to l and that the response of stomatal conductance to l is closely correlated with the response of Kleaf to l. The turgor loss point of leaves was also correlated with Kleaf and stomatal closure, whereas the decline in PSII quantum yield during leaf drying occurred at a lower l than stomatal closure. These results indicate that stomatal closure is primarily coordinated with Kleaf. However, the close proximity of l at initial stomatal closure and initial loss of Kleaf suggest that partial loss of Kleaf might occur regularly, presumably necessitating repair of embolisms.
(private-note)Rehydration and pressure bomb to measure Kleaf -assumes that the main site of resistance is in the veins, not in the mesophyll, so it won't work for me. -wouldn't work for freezing anyway. 'conductance' WOULD BE GREATEST IMMEDIATELY AFTER A FREEZE WHEN ALL THE CELLS ARE SUCKING, SURELY? After pressure bombing leaves, they can't be rehydrated- it just doesn't work. Gee! Leaves provide probably the best environment for refilling of embolized conduits (Salleo et al., 2000; 2001) due to the relative abundance of inorganic ions and other osmolytes that could be used to generate positive pressures (Holbrook and Zwieniecki, 1999), as well as possessing large amounts of metabolic energy to drive ion movement.
%0 Journal Article
%1 Brodribb_Holbrook_03
%A Brodribb, T.
%A Holbrook, N. M.
%D 2003
%J Plant Physiology
%K bibtex-import, citeulikeExport droughtbolism, embolism, papercopy, refilling
%P 2166--2173
%T Stomatal Closure during Leaf Dehydration, Correlation with Other Leaf Physiological Traits
%V 132
%X The question as to what triggers stomatal closure during leaf desiccation remains controversial. This paper examines characteristics of the vascular and photosynthetic functions of the leaf to determine which responds most similarly to stomata during desiccation. Leaf hydraulic conductance (Kleaf) was measured from the relaxation kinetics of leaf water potential (l), and a novel application of this technique allowed the response of Kleaf to l to be determined. These ?vulnerability curves? show that Kleaf is highly sensitive to l and that the response of stomatal conductance to l is closely correlated with the response of Kleaf to l. The turgor loss point of leaves was also correlated with Kleaf and stomatal closure, whereas the decline in PSII quantum yield during leaf drying occurred at a lower l than stomatal closure. These results indicate that stomatal closure is primarily coordinated with Kleaf. However, the close proximity of l at initial stomatal closure and initial loss of Kleaf suggest that partial loss of Kleaf might occur regularly, presumably necessitating repair of embolisms.
@article{Brodribb_Holbrook_03,
abstract = {{The question as to what triggers stomatal closure during leaf desiccation remains controversial. This paper examines characteristics of the vascular and photosynthetic functions of the leaf to determine which responds most similarly to stomata during desiccation. Leaf hydraulic conductance (Kleaf) was measured from the relaxation kinetics of leaf water potential (l), and a novel application of this technique allowed the response of Kleaf to l to be determined. These ?vulnerability curves? show that Kleaf is highly sensitive to l and that the response of stomatal conductance to l is closely correlated with the response of Kleaf to l. The turgor loss point of leaves was also correlated with Kleaf and stomatal closure, whereas the decline in PSII quantum yield during leaf drying occurred at a lower l than stomatal closure. These results indicate that stomatal closure is primarily coordinated with Kleaf. However, the close proximity of l at initial stomatal closure and initial loss of Kleaf suggest that partial loss of Kleaf might occur regularly, presumably necessitating repair of embolisms.}},
added-at = {2019-03-31T01:14:40.000+0100},
author = {Brodribb, T. and Holbrook, N. M.},
biburl = {https://www.bibsonomy.org/bibtex/2db794e5144b1ecaf8a31e44c066d9390/dianella},
citeulike-article-id = {1523630},
comment = {(private-note)Rehydration and pressure bomb to measure Kleaf -assumes that the main site of resistance is in the veins, not in the mesophyll, so it won't work for me. -wouldn't work for freezing anyway. 'conductance' WOULD BE GREATEST IMMEDIATELY AFTER A FREEZE WHEN ALL THE CELLS ARE SUCKING, SURELY? After pressure bombing leaves, they can't be rehydrated- it just doesn't work. Gee! Leaves provide probably the best environment for refilling of embolized conduits (Salleo et al., 2000; 2001) due to the relative abundance of inorganic ions and other osmolytes that could be used to generate positive pressures (Holbrook and Zwieniecki, 1999), as well as possessing large amounts of metabolic energy to drive ion movement.},
interhash = {435fd6d4339cbad71c27d6c6d8594de2},
intrahash = {db794e5144b1ecaf8a31e44c066d9390},
journal = {Plant Physiology},
keywords = {bibtex-import, citeulikeExport droughtbolism, embolism, papercopy, refilling},
pages = {2166--2173},
posted-at = {2007-07-31 06:09:36},
priority = {2},
timestamp = {2019-03-31T01:16:26.000+0100},
title = {{Stomatal Closure during Leaf Dehydration, Correlation with Other Leaf Physiological Traits}},
volume = 132,
year = 2003
}