کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2058023 | 1076144 | 2007 | 11 صفحه PDF | دانلود رایگان |
SummaryIn 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.
Journal: Journal of Plant Physiology - Volume 164, Issue 10, 19 October 2007, Pages 1300–1310