Effects of ammonium nitrate, cesium chloride and tetraethylammonium on high-affinity potassium uptake in habanero pepper plantlets (Capsicum chinense Jacq.)
Potassium (K +) is an essential nutrient and the most abundant cation in plant cells. Plants have a wide variety of transport systems for K + acquisition that catalyze K + uptake across a wide spectrum ofexternal K + concentrations and mediate K + movement within the plant, as well as its release into the environment. The KUP/HAK/KT transporter family plays a key role in K + homeostasis in plant cells. The present study demonstrates that habanero pepper plantlets have a clear pattern of K + uptake when resupplemented with K + after K + starvation. Habanero pepper plantlets, re-supplemented with a solution containing low concentrations of K + after 72, 96 or 120 h of K + starvation were able to decrease the amount of K + in the solution at different time points. To study the effect of NH 4 +, we added different concentrations of NH4NO3 to the medium solution and demonstrated that NH 4 + inhibited K + uptake in a dose-dependent manner. When the plantlets were subjected to K +starvation for 72 h and then resupplemented with 50 or 100 μM K +, exposure to K + channel blockers (10 mM CsCl and 20 mM TEA) decreased their K + uptake compared with the control treatment. A model demonstrating the process of K + uptake through an NH 4 +-insensitive component was proposed.
| Main Authors: | , , , , , , |
|---|---|
| Format: | info:eu-repo/semantics/article biblioteca |
| Language: | eng |
| Subjects: | info:eu-repo/classification/Autores/ AMMONIUM, info:eu-repo/classification/Autores/CHANNEL BLOCKERS, info:eu-repo/classification/Autores/HIGH AFFINITY TRANSPORTERS, info:eu-repo/classification/Autores/POTASSIUM, info:eu-repo/classification/cti/2, |
| Online Access: | http://cicy.repositorioinstitucional.mx/jspui/handle/1003/759 |
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