Published: 25 May, 2021 | Volume 5 - Issue 2 | Pages: 028-043
Figure 3:
Intracellular Na+ homeostasis mediated by Na+ transporters and channels and their regulatory elements. Some new components in these transport mechanisms have been added, i.e., the regulation of stelar-localized SOS1 activity by Nax1 and Nax2 Na+ exclusion loci in rice. This regulation improves salt stress tolerance by enhancing the retrieval of Na+ from xylem back into stellar cells. Another component is the potential involvement of plant aquaporins (AQP, AtPIP2;1 in particular) in Na+ uptake. Equally important is the role of FV (fast vacuolar) and SV (slow vacuolar) channels that mediate vacuolar Na+ leakage to the cytosol, deemed a salt-sensitive trait. Worthy of note also is the role of PM and TP H+ pumps that generate a pmf to energize Na+ transport via the two Na+/H+ exchangers (SOS1 and NHXs), The NADPH dehydrogenase (NDH)-dependent cyclic electron flow (CEF) constitutes an important source of ATP required to fuel Na+ sequestration into vacuoles.
Read Full Article HTML DOI: 10.29328/journal.jpsp.1001058 Cite this Article Read Full Article PDF
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