Salinity-induced expression of HKT may be crucial for Na(+) exclusion in the leaf blade of huckleberry (Solanum scabrum Mill.), but not of eggplant (Solanum melongena L.)

Biochemical and Biophysical Research Communications
Dekoum V M AssahaHirofumi Saneoka

Abstract

Reduced Na(+) accumulation in the leaf blade is an important aspect of salinity tolerance and high affinity K(+) transporters (HKTs) are known to play a significant role in the process. Huckleberry and eggplant have previously been shown to display 'excluder' and 'includer' characteristics, respectively, under salt stress, but the underlying mechanisms have not been investigated. Here, we isolated the cDNA of the HKT homologs, Solanum scabrum HKT (SsHKT) from huckleberry and Solanum melongena HKT (SmHKT) from eggplant, and analyzed their expressions in different tissues under salt stress. SsHKT expression was markedly induced in the root (28-fold) and stem (7-fold), with a corresponding increase in Na(+) accumulation of 52% and 29%, respectively. Conversely, eggplant accumulated 60% total Na(+) in the leaf blade, with a lower SmHKT expression level in the root (3-fold). Huckleberry also maintained a higher K(+)/Na(+) ratio in the leaf blade compared to eggplant, due to the reduction of its Na(+) concentration and unaltered K(+) concentration. Functional analysis demonstrated that SsHKT-mediated Na(+) influx inhibited yeast growth under Na(+) stress, and that SsHKT did not complement the growth of the K(+) uptake-deficient CY162...Continue Reading

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Citations

Jun 5, 2015·Frontiers in Plant Science·Mahmoud W Yaish, Prakash P Kumar
Aug 5, 2017·Frontiers in Physiology·Dekoum V M AssahaMahmoud W Yaish
Jul 14, 2021·Journal of Agricultural and Food Chemistry·Bingbing LiuZongwei Cai

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