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231223s2007 xx ||||| 00| ||eng c |
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|a (NLM)16325303
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Quintero, José Manuel
|e verfasserin
|4 aut
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|a Na+ accumulation in shoot is related to water transport in K+-starved sunflower plants but not in plants with a normal K+ status
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|c 2007
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|b nc
|2 rdacarrier
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|a Date Completed 26.03.2007
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Sunflower plants (Helianthus annuus L. cv Sun-Gro 380) grown in nutrient solutions with different K+ levels were used to study the effect of potassium status on water uptake, Na+ uptake and Na+ accumulation in the shoot. Changes in nutrient potassium levels induced evident differences in internal potassium content. When both low and normal-K+ plants were exposed to 22 degrees C and salinity conditions (25 or 50 mM NaCl) during a short time period (9h), water uptake in low-K+ plants was greater than in normal-K+ plants. In addition, K+ starvation favoured the Na+ uptake and the Na+ accumulation both in the root and in the shoot. When the plants were exposed to heat stress by a sharp increase of the temperature to 32 degrees C during the same period of time, the stimulating effect of K+ starvation on the water uptake was even greater. The high temperature increased Na+ uptake in both types of plants, but the Na+ accumulation in the shoot was only favoured in low-K+ plants. The results suggest that Na+ accumulation in the shoot is more dependent on the water uptake in low-K+ plants than in normal-K+ plants, and this effect could explain the greatest susceptibility to the salinity in K+-starved plants under high transpiration conditions, which are typical in dry climates
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Water
|2 NLM
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|a Sodium
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|a Potassium
|2 NLM
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|a Fournier, José María
|e verfasserin
|4 aut
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|a Benlloch, Manuel
|e verfasserin
|4 aut
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|i Enthalten in
|t Journal of plant physiology
|d 1979
|g 164(2007), 1 vom: 02. Jan., Seite 60-7
|w (DE-627)NLM098174622
|x 1618-1328
|7 nnas
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| 773 |
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|g volume:164
|g year:2007
|g number:1
|g day:02
|g month:01
|g pages:60-7
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