Gene Details:

• MSU gene ID: LOC_Os01g45990
• RAPdb gene ID: Os01g0648000
• Gene Symbol: OsAKT1
• Genome: MSU7 ,  IRGSP-1.0
• Species: Oryza sativa

Functional Descriptions:

• To unravel the mechanisms of K+ uptake and its sensitivity to salt stress in the model plant rice, we isolated and functionally characterized OsAKT1, a potassium channel homologous to the Arabidopsis root inward rectifier AKT1.
• OsAKT1 transcripts were predominantly found in the coleoptile and in the roots of young rice seedlings.
• Patch-clamp studies on rice root protoplasts identified a K+ inward rectifier with similar channel properties as heterologously expressed OsAKT1.
• In line with the transcriptional downregulation of OsAKT1 in response to salt stress, inward K+ currents were significantly reduced in root protoplasts.
• Thus, OsAKT1 seems to represent the dominant salt-sensitive K+ uptake channel in rice roots.
• Rice K+ uptake channel OsAKT1 is sensitive to salt stress.
• The Os-AKT1 Channel Is Critical for K+ Uptake in Rice Roots and Is Modulated by the Rice CBL1-CIPK23 Complex.
• Disruption of Os-AKT1 significantly reduced the K+ content, which resulted in inhibition of plant growth and development.
• 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.
• However, loss-of-function of OsAKT1 increased the sensitivity to excess Fe regarding leaf bronzing symptoms, reactive oxygen species generation, leaf spectral reflectance indices, and chlorophyll fluorescence.
• In conclusion, OsAKT1 is crucial for the tolerance of rice against Fe toxicity as K homeostasis affects Fe translocation from root to shoot.
• Potassium Ion Channel Gene OsAKT1 Affects Iron Translocation in Rice Plants Exposed to Iron Toxicity.

Function-related keywords:

• potassium ,  root ,  salt ,  salt-stress ,  seedling ,  potassium-uptake ,  plant-growth ,  growth ,  development ,  drought ,  tolerance ,  stress ,  drought-stress ,  stress-tolerance ,  leaf ,  shoot ,  homeostasis ,  iron ,  reactive-oxygen-species

Literature:

• Rice K+ uptake channel OsAKT1 is sensitive to salt stress .  DOI:  10.1007/s00425-004-1437-9 ;  PMID:  15599592
• The Os-AKT1 Channel Is Critical for K+ Uptake in Rice Roots and Is Modulated by the Rice CBL1-CIPK23 Complex .  DOI:  10.1105/tpc.114.123455 ;  PMID:  25096783
• Overexpression of the rice AKT1 potassium channel affects potassium nutrition and rice drought tolerance .  DOI:  10.1093/jxb/erw103 ;  PMID:  26969743
• Potassium Ion Channel Gene OsAKT1 Affects Iron Translocation in Rice Plants Exposed to Iron Toxicity .  DOI:  10.3389/fpls.2019.00579 ;  PMID:  31134118
• Calcium lignosulfonate improves proliferation of recalcitrant indica rice callus via modulation of auxin biosynthesis and enhancement of nutrient absorption .  DOI:  10.1016/j.plaphy.2021.01.046 ;  PMID:  33581621
• Silicon alleviates salt stress-induced potassium deficiency by promoting potassium uptake and translocation in rice (Oryza sativa L.) .  DOI:  10.1016/j.jplph.2021.153379 ;  PMID:  33639555
• Genome-Wide Analysis of Potassium Channel Genes in Rice: Expression of the OsAKT and OsKAT Genes under Salt Stress .  DOI:  10.3390/genes12050784 ;  PMID:  34065373

Related News:

Gene Resources:

• NCBI ID: AK120308
• UniProt accessions:

Sequences: