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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Nadia Bárcena, Mónica Ruiz and Carlos Parera
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DOI:10.17265/2161-6256/2016.05.004
Affiliation(s)
Agricultural Experimental Station-San Juan, National Institute of Agricultural Technology (INTA), Integrated Unit INTA-National University of San Juan, San Juan 5400, Argentina
ABSTRACT
Salinity is a major stress
that adversely affects growth and productivity in plants. There are species
that tolerate this stress within the genus Atriplex.
Four species, A. lampa, A. crenatifolia, A. nummularia and A.
argentina were compared for their ion accumulation and water relations
under saline conditions. A greenhouse study was conducted by irrigating the four
species with NaCl solutions at concentrations 0%, 1%, 2% and 4% starting when plants were six months old. Plants
were harvested 45 d after starting the salinity treatments and analyzed for
their ion contents. In the four Atriplex species, Na+ and Cl– contents in plants increased, while Ca2+ and Mg2+ decreased with the increase of salinity in the irrigation
solution. The results suggested that A.
argentina and A. nummularia were
able to maintain a higher leaf relative water content (RWC) at low leaf water potential, which was associated with
a greater capacity of osmotic adjustment. A.
lampa showed lower ion accumulation and minor osmotic adjustment than the
other species. It can be concluded that the accumulation of ions favors the lower osmotic
potential and contributes to osmotic adjustment in these halophytes.
KEYWORDS
Atriplex sp., salinity stress, osmotic adjustment, ion accumulation, water relations.
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