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Authors Tattini, M; Gucci, R
Author Full Name Tattini, M; Gucci, R
Title Ionic relations of Phillyrea latifolia L. plants during NaCl stress and relief from stress
Source CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE
Language English
Document Type Article
Author Keywords chloride; excretion; growth; Phillyrea latifolia; potassium; sodium
Keywords Plus SALT TOLERANCE; SALINITY TOLERANCE; GAS-EXCHANGE; L KUNTH; MECHANISMS; LEAVES; TRANSPORT; CHLORIDE; GROWTH; FLOWS
Abstract Two experiments were conducted on Phillyrea latifolia L. plants exposed to increasing NaCl concentrations at the root zone in hydroponic culture. Growth, ion fluxes within the plant, and rates of excretion by glandular trichomes were measured during both salinity stress and relief periods. The reduction in relative growth rate (RGR) of plants treated with 100 and 200 mM external NaCl was more marked when RGR was calculated on a fresh weight (FW) basis than on a dry weight (DW) basis. The RGR of previously salt-treated plants, expressed on a FW basis, did not differ from that of the controls over 5 weeks of relief from stress, whereas RGR calculated on a DW basis did not fully recover. Fluxes of Na+ and K+ appeared highly regulated. Sodium transport to the leaf of 100 mM salt-treated plants equalled that of the controls, whereas Na+ transport to the leaf was higher in 200 mM salt-treated plants. Selectivity ratio for K+ and Na+ transport to the leaf was increased by salt treatments. The exclusion ability for Cl- was markedly lower than that for Na+ at 300 and 400 mM external NaCl. The excretion of Na+ and Cl- by glandular trichomes was very low at all external NaCl concentrations and substantially higher in basal leaves than in apical leaves. These results indicate that in P. latifolia, mechanisms of salt tolerance operate by excluding sodium and maintaining high selectivity for uptake and transport of K+, whereas the excretion of toxic ions is of minor significance.
Author Address Consiglio Nazl Ric, Ist Propagaz Specie Legnose, I-50018 Florence, Italy; Univ Pisa, Sez Coltivaz Arboree, Dipartimento Difesa & Coltivaz Specie Legnose, I-56124 Pisa, Italy
Reprint Address Tattini, M (corresponding author), Consiglio Nazl Ric, Ist Propagaz Specie Legnose, Via Ponte di Formicola 76, I-50018 Florence, Italy.
ResearcherID Number Tattini, Massimiliano/K-1238-2019
ORCID Number Tattini, Massimiliano/0000-0001-5434-8860
Times Cited 24
Total Times Cited Count (WoS, BCI, and CSCD) 28
Publisher NATL RESEARCH COUNCIL CANADA
Publisher City OTTAWA
Publisher Address RESEARCH JOURNALS, MONTREAL RD, OTTAWA, ONTARIO K1A 0R6, CANADA
ISSN 0008-4026
29-Character Source Abbreviation CAN J BOT
ISO Source Abbreviation Can. J. Bot.-Rev. Can. Bot.
Publication Date JUL
Year Published 1999
Volume 77
Issue 7
Beginning Page 969
Ending Page 975
Digital Object Identifier (DOI) 10.1139/b99-049
Page Count 7
Web of Science Category Plant Sciences
Subject Category Plant Sciences
Document Delivery Number 262AZ
Unique Article Identifier WOS:000084044700008
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