Membrane fluxes, bypass flows, and sodium stress in rice: the influence of silicon
AuthorFlam-Shepherd, R; Huynh, WQ; Coskun, D; Hamam, AM; Britto, DT; Kronzucker, HJ
Source TitleJOURNAL OF EXPERIMENTAL BOTANY
PublisherOXFORD UNIV PRESS
University of Melbourne Author/sKronzucker, Herbert
AffiliationVeterinary and Agricultural Sciences
Agriculture and Food Systems
Document TypeJournal Article
CitationsFlam-Shepherd, R., Huynh, W. Q., Coskun, D., Hamam, A. M., Britto, D. T. & Kronzucker, H. J. (2018). Membrane fluxes, bypass flows, and sodium stress in rice: the influence of silicon. JOURNAL OF EXPERIMENTAL BOTANY, 69 (7), pp.1679-1692. https://doi.org/10.1093/jxb/erx460.
Access StatusOpen Access
Open Access at PMChttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC5889039
Provision of silicon (Si) to roots of rice (Oryza sativa L.) can alleviate salt stress by blocking apoplastic, transpirational bypass flow of Na+ from root to shoot. However, little is known about how Si affects Na+ fluxes across cell membranes. Here, we measured radiotracer fluxes of 24Na+, plasma membrane depolarization, tissue ion accumulation, and transpirational bypass flow, to examine the influence of Si on Na+ transport patterns in hydroponically grown, salt-sensitive (cv. IR29) and salt-tolerant (cv. Pokkali) rice. Si increased growth and lowered [Na+] in shoots of both cultivars, with minor effects in roots; neither root nor shoot [K+] were affected. In IR29, Si lowered shoot [Na+] via a large reduction in bypass flow, while in Pokkali, where bypass flow was small and not affected by Si, this was achieved mainly via a growth dilution of shoot Na+. Si had no effect on unidirectional 24Na+ fluxes (influx and efflux), or on Na+-stimulated plasma-membrane depolarization, in either IR29 or Pokkali. We conclude that, while Si can reduce Na+ translocation via bypass flow in some (but not all) rice cultivars, it does not affect unidirectional Na+ transport or Na+ cycling in roots, either across root cell membranes or within the bulk root apoplast.
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