Do increases in xylem sap pH and/or ABA concentration mediate stomatal closure following nitrate deprivation?

Dodd, IC, Tan, LP and He, J (2003) Do increases in xylem sap pH and/or ABA concentration mediate stomatal closure following nitrate deprivation?. Journal of Experimental Botany, 54 385: 1281-1288. doi:10.1093/jxb/erg122


Author Dodd, IC
Tan, LP
He, J
Title Do increases in xylem sap pH and/or ABA concentration mediate stomatal closure following nitrate deprivation?
Journal name Journal of Experimental Botany   Check publisher's open access policy
ISSN 0022-0957
Publication date 2003-01-01
Sub-type Article (original research)
DOI 10.1093/jxb/erg122
Open Access Status Not yet assessed
Volume 54
Issue 385
Start page 1281
End page 1288
Total pages 8
Place of publication England
Publisher Oxford University Press
Language eng
Subject C1
270402 Plant Physiology
620208 Vegetables
Abstract Stomatal conductance (g(s)) of pepper (Capsicum annuum L.) plants decreased during the second photoperiod (day 2) after withholding nitrate (N). Stomatal closure of N-deprived plants was not associated with a decreased shoot water potential (Psi(shoot)); conversely Psi(shoot) was lower in N-supplied plants. N deprivation transiently (days 2 and 3) alkalized (0.2-0.3 pH units) xylem sap exuded from de-topped root systems under root pressure, and xylem sap expressed from excised shoots by pressurization. The ABA concentration of expressed sap increased 3-4-fold when measured on days 2 and 4. On day 2, leaves detached from N-deprived and N-supplied plants showed decreased transpiration rates when fed an alkaline (pH 7) artificial xylem (AX) solution, independent of the ABA concentration (10-100 nM) supplied. Thus changes in xylem sap composition following N deprivation can potentially close stomata. However, the lower transpiration rate of detached N-deprived leaves relative to N-supplied leaves shows that factors residing within N-deprived leaves also mediate stomatal closure, and that these factors assume greater importance as the duration of N deprivation increases.
Keyword Plant Sciences
Abscisic Acid
Capsicum
Nitrate
Stomata
Water Status
Xylem Ph
Abscisic-acid Content
Nitrogen Nutrition
Water Relations
Solanum-tuberosum
Sunflower Plants
Leaf Expansion
Pisum-sativum
Tomato Plants
Cotton Plants
Growth
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2004 Higher Education Research Data Collection
School of Biological Sciences Publications
 
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Created: Wed, 15 Aug 2007, 05:13:29 EST