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Ion Accumulation, Water Relations and Osmotic Adjustment in atriplex argentina, A. crenatifolia, *** and A. nummularia under Saline Conditions

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Journal of Agricultural Science and Technology(A) 2016年第5期6卷 324-334页

作者： Nadia Barcena Monica Ruiz Carlos Parera Agricultural Experimental Station-San Juan National Institute of Agricultural Technology (INTA) Integrated Unit INTA-NationalUniversity of San Juan San Juan 5400 Argentina

Salinity is a major stress that adversely affects growth and productivity in plants. There are species that tolerate this stresswithin the genus atriplex. Four species, A. lampa, A. crenatifolia, A. nummularia and A. argentina were compared for their ionaccumulation and water relations under saline conditions. A greenhouse study was conducted by irrigating the four species with NaCIsolutions at concentrations 0%, 1%, 2% and 4% starting when plants were six months old. Plants were harvested 45 d after startingthe salinity treatments and analyzed for their ion contents. In the four atriplex species, Na^＋ and Cl^- contents in plants increased, whileCa^2＋ and Mg^2＋ decreased with the increase of salinity in the irrigation solution. The results suggested that A. argentina and *** were able to maintain a higher leaf relative water content （RWC） at low leaf water potential, which was associated witha greater capacity of osmotic adjustment. A. lampa showed lower ion accumulation and minor osmotic adjustment than the otherspecies. It can be concluded that the accumulation of ions favors the lower osmotic potential and contributes to osmotic adjustment inthese halophytes.

关键词： atriplex sp., salinity stress, osmotic adjustment, ion accumulation, water relations.

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