Common reed absorbs K+ more selectively than rice against high Na+/K+ ratio in nutrient solution
Year: 2017
Type: article
Abstract: The introduction of an active Na+ excretion system from salt-tolerant plants in salt-sensitive crop plants might necessitate enhancement of the robustness of K+ homeostasis and lead to improved plant growth under salt stress. To address this issue, we compared the acquisition and retention of K+ under excess Na+ concentrations in the common reed, which possesses excellent Na+ excretion ability, and low-Na+ excreting rice. Under excess Na+ concentrations, common reed maintained constant K+ content in all plant parts, whereas K+ content in rice decreased with increasing Na+ concentration. Preferential uptake of K+ against high Na+/K+ ratio in nutrient solution was approximately 10 times higher in common reed than in rice. The impact of excess Na+ on net K+ absorption rate of common reed was small. On the other hand, the net K+ absorption rate of rice was decreased by excess Na+ concentration. However, after the Na+ concentration in the nutrient solution was decreased from 50 to 1 mM, K+ absorption in rice recovered immediately. Thus, selectivity of K+ transporters or channels for K+ over Na+ in roots could be involved in the differences in K+ accumulation in rice and common reed.
Source: Soil Science & Plant Nutrition
Authors: Kyoko Higuchi, Kumiko Hara
Institution: Tokyo University of Agriculture
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2764011919