The Unseen Gem Of SP600125

2009) (Fig.?1b). Similarly, unidirectional 22Na+ fluxes in Odin and Towner, two contrasting durum wheat cultivars (tolerant and sensitive, respectively; Cuin et?al. 2009), were not statistically different. In addition, no major difference in unidirectional 22Na+ uptake was detected 60?min after salt stress was applied (Fig.?1c). Thus, the results presented corroborate previous reports that the contrasting Na+ accumulation and salinity tolerance in wheat is not conferred by differences in the unidirectional uptake of Na+ (Davenport et?al. 1997). It is not the unidirectional Na+ uptake but the net Na+ flux (i.e. the difference between Na+ uptake and its extrusion) that is critical to salinity tolerance. Nonetheless, the detection of potentially small but critical differences between influx and efflux is impeded by the poor signal-to-noise ratio that occurs in the presence of high Na+ concentrations http://www.selleckchem.com/products/SP600125.html in the bathing medium. As shown in Fig.?1a, even at the relatively low concentration of NaCl used in the present study (50?mM), resolution of the Na+ flux is still problematic. This problem was mitigated by adapting an approach used previously to study the effects of extreme pH treatment http://www.selleck.cn/products/Imatinib(STI571).html on the activity of H+ transporters: a so-called ��recovery�� protocol (Fuglsang et?al. 2007). In this method, the net efflux of Na+ is recorded immediately following the cessation of salinity treatment. Accordingly, 6-day-old wheat roots were treated with 150?mM NaCl for 24?h, then NaCl was quickly removed and Na+ flux responses were measured. A rapid and massive efflux of Na+ from roots was recorded in all cultivars immediately after the removal of NaCl from the bathing medium (Fig.?2). In seven out of the eight cultivars examined, the net efflux rapidly subsided within 5?min. It could be argued that this initial efflux from the roots might originate from the removal of loosely bound Na+ from the root surface as well as from the apoplastically bound Na+ (Wang et?al. 2006). For this reason, a time point of 20?min after NaCl removal was chosen for comparative purposes. By this time, net Na+ fluxes reached their steady levels, and no confounding effects of either K+ or Ca2+ were present (discussed below). http://www.selleckchem.com/products/AZD6244.html At this time point, a small but significant (P?