We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Overexpression of the rice AKT1 potassium channel affects potassium nutrition and rice drought tolerance.
- Authors
Ahmad, Izhar; Maathuis, Frans J. M.; Mian, Afaq
- Abstract
Potassium (K+) is the most important cationic nutrient for all living organisms and has roles in most aspects of plant physiology. To assess the impact of one of the main K+ uptake components, the K+ inward rectifying channel AKT1, we characterized both loss of function and overexpression of OsAKT1 in rice. In many conditions, AKT1 expression correlated with K+ uptake and tissue K+ levels. No salinity-related growth phenotype was observed for either loss or gain of function mutants. However, a correlation between AKT1 expression and root Na+ when the external Na/K ratio was high suggests that there may be a role for AKT1 in Na+ uptake in such conditions. In contrast to findings with Arabidopsis thaliana, we did not detect any change in growth of AKT1 loss of function mutants in the presence of NH4+. Nevertheless, NH4+-dependent inhibition was detected during K+ uptake assays in loss of function and wild type plants, depending on pre-growth conditions. The most prominent result of OsAKT1 overexpression was a reduction in sensitivity to osmotic/drought stress in transgenic plants: the data suggest that AKT1 overexpression improved rice osmotic and drought stress tolerance by increasing tissue levels of K+, especially in the root.
- Subjects
CROPS; DROUGHT tolerance; RICE -- Nutrition; POTASSIUM content of plants; GENETIC overexpression; ION channels; OSMOTIC potential of plants; PLANTS
- Publication
Journal of Experimental Botany, 2016, Vol 67, Issue 9, p2689
- ISSN
0022-0957
- Publication type
Article
- DOI
10.1093/jxb/erw103