start-ver=1.4
cd-journal=joma
no-vol=9
cd-vols=
no-issue=1
article-no=
start-page=16
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=20191221
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Expression and Ion Transport Activity of Rice OsHKT1;1 Variants
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=OsHKT1;1 in rice, belongs to the high-affinity K+ Transporter family, has been found to be involved in salt tolerance. OsHKT1;1 in japonica rice (Nipponbare) produces mRNA variants, but their functions remain elusive. In salt tolerant rice, Pokkali, eight OsHKT1;1 variants (V1-V8) were identified in addition to the full-length OsHKT1;1 (FL) cDNA. Absolute quantification by qPCR revealed that accumulation of OsHKT1;1-FL mRNA is minor in contrast to that of OsHKT1;1-V1, -V2, -V4, and -V7 mRNAs, all of which are predominant in shoots, while only V1 and V7 mRNAs are predominant in roots. Two electrode voltage clamp (TEVC) experiments using Xenopus laevis oocytes revealed that oocytes-expressing OsHKT1;1-FL from Pokkali exhibited inward-rectified currents in the presence of 96 mM Na+ as reported previously. Further TEVC analyses indicated that six of eight OsHKT1;1 variants elicited currents in a Na+ or a K+ bath solution. OsHKT1;1-V6 exhibited a similar inward rectification to the FL protein. Contrastingly, however, the rests mediated bidirectional currents in both Na+ and K+ bath solutions. These data suggest possibilities that novel mechanisms regulating the transport activity of OsHKT1;1 might exist, and that OsHKT1;1 variants might also carry out distinct physiological roles either independently or in combination with OsHKT1;1-FL.
en-copyright=
kn-copyright=

en-aut-name=ImranShahin
en-aut-sei=Imran
en-aut-mei=Shahin
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=HorieTomoaki
en-aut-sei=Horie
en-aut-mei=Tomoaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=KatsuharaMaki
en-aut-sei=Katsuhara
en-aut-mei=Maki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=

affil-num=2
en-affil=Division of Applied Biology, Faculty of the Textile Science and Technology, Shinshu University
kn-affil=

affil-num=3
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
en-keyword=HKT
kn-keyword=HKT
en-keyword=rice
kn-keyword=rice
en-keyword=salt tolerance
kn-keyword=salt tolerance
en-keyword=Na+ transport
kn-keyword=Na+ transport
en-keyword=K+ transport
kn-keyword=K+ transport
en-keyword=mRNA variants
kn-keyword=mRNA variants
END