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Plant growth and the expression of two transporter genes; PoHKT1 and PoVHA   transcripts in root and shoot tissues were studied under salt stress of three   Portulaca oleracea s.l. taxa. The study showed no significant differences in   ratios between root lengths in saline and non-saline treatments of the three   taxa, which was correlated with a clear down-regulation of the PoHKT1   transcripts in the root after 150mM NaCl. All measured growth parameters   except root length increased in P. oleraceae, decreased in P.   granulatostellulata and remain unchanged after 100mM NaCl in P. nitida   compared to control under saline conditions. The result was consistent with   the type of taxon which had significant effect on the shoot length, number of   leaves and dry weight (P< 0.05). All measured growth parameters except root   length showed a significant negative correlation with the shoot fold change   of PoHKT1 transcripts (r = -0.607, -0.693 and -0.657 respectively). The   regulation of PoVHA in root and shoot tissues in the three taxa are   significantly different. Under salt stress, both decreased uptake of Na+ into   the cytosol by decreasing the expression of PoHKT1 and increased vascular   compartmentalization ability of Na+ by inducing the expression of PoVHA seem   to work more efficiently in P. oleraceae and P. nitida than in P.   granulato-stellulata

Diversity in growth and expression pattern of PoHKT1 and PoVHA transporter genes under NaCl stress in Portulaca oleracea taxa