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Title

Different cation stresses affect specifically osmotic root hydraulic conductance, involving aquaporins, ATPase and xylem loading of ions in Capsicum annuum, L. plants

AuthorsCabañero, Francisco J. ; Carvajal, Micaela
KeywordsAquaporins
ATPase
Calcium stress
Root hydraulic conductance
Salinity
Issue Date19-Oct-2007
PublisherElsevier
CitationJournal of Plant Physiology 164(10): 1300-1310 (2007)
AbstractIn order to study the effect of nutrient stress on water uptake in pepper plants (Capsicum annuum L.), the excess or deficiency of the main cations involved in plant nutrition (K+, Mg2+, Ca2+) and two different degrees of salinity were related to the activity of plasma membrane H+-ATPase, the pH of the xylem sap, nutrient flux into the xylem (Js) and to a number of parameters related to water relations, such as root hydraulic conductance (L0), stomatal conductance (gs) and aquaporin activity. Excess of K+, Ca+ and NaCl produced a toxic effect on L0 while Mg2+ starvation produced a positive effect, which was in agreement with aquaporin functionality, but not with ATPase activity. The xylem pH was altered only by Ca treatments. The results obtained with each treatment could suggest that detection of the quality of the nutrient supply being received by roots can be related to aquaporins functionality, but also that each cation stress triggers specific responses that have to be assessed individually.
Publisher version (URL)http://dx.doi.org/10.1016/j.jplph.2006.08.010
URIhttp://hdl.handle.net/10261/17440
DOI10.1016/j.jplph.2006.08.010
ISSN0176-1617
Appears in Collections:(CEBAS) Artículos
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