Journal Article

FZJ-2013-06242

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Threshold response of stomatal closing ability to leaf abscisic acid concentration during growth

Giday, H. (Corresponding author) ; Fanourakis, D.FZJ* ; Kajaer, K. H. ; Fomsgaard, I. S. ; Ottosen, C. -.

2014
Univ. Press Oxford

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Please use a persistent id in citations: http://hdl.handle.net/2128/8036  doi:10.1093/jxb/eru216

Abstract: Leaf abscisic acid concentration ([ABA]) during growth influences morpho-physiological traits associated with the plant’s ability to cope with stress. A dose–response curve between [ABA] during growth and the leaf’s ability to regulate water loss during desiccation or rehydrate upon re-watering was obtained. Rosa hybrida plants were grown at two relative air humidities (RHs, 60% or 90%) under different soil water potentials (–0.01, –0.06, or –0.08MPa) or upon grafting onto the rootstock of a cultivar sustaining [ABA] at elevated RH. Measurements included [ABA], stomatal anatomical features, stomatal responsiveness to desiccation, and the ability of leaves, desiccated to varying degrees, to recover their weight (rehydrate) following re-watering. Transpiration efficiency (plant mass per transpired water) was also determined. Soil water deficit resulted in a lower transpiration rate and higher transpiration efficiency at both RHs. The lowest [ABA] was observed in well-watered plants grown at high RH. [ABA] was increased by soil water deficit or grafting, at both RHs. The growth environment-induced changes in stomatal size were mediated by [ABA]. When [ABA] was increased from the level of (well-watered) high RH-grown plants to the value of (well-watered) plants grown at moderate RH, stomatal responsiveness was proportionally improved. A further increase in [ABA] did not affect stomatal responsiveness to desiccation. [ABA] was positively related to the ability of dehydrated leaves to rehydrate. The data indicate a growth [ABA]-related threshold for stomatal sensitivity to desiccation, which was not apparent either for stomatal size or for recovery (rehydration) upon re-watering.

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Contributing Institute(s):

1. Pflanzenwissenschaften (IBG-2)

Research Program(s):

1. 242 - Sustainable Bioproduction (POF2-242) (POF2-242)
2. 89582 - Plant Science (POF2-89582) (POF2-89582)
3. EPPN - European Plant Phenotyping Network (284443) (284443)

Appears in the scientific report 2014

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Database coverage:
; ; ; Allianz-Lizenz / DFG ; BIOSIS Previews ; Current Contents - Agriculture, Biology and Environmental Sciences ; Current Contents - Life Sciences ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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