Calcium supply effects on wheat cultivars differing in salt resistance with special reference to leaf cytosol ion homeostasis
2013 (English)In: Physiologia Plantarum: An International Journal for Plant Biology, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 149, no 3, 321-328 p.Article in journal (Refereed) Published
Salinity causes changes in cytosolic Ca2+, [Ca2+](cyt), Na+, [Na+](cyt) and pH, pH(cyt), which induce specific reactions and signals. Reactions causing a rebalancing of the physiological homeostasis of the cytosol could result in plant resistance and growth. Two wheat cultivars, Triticum aestivum, Seds1 and Vinjett, were grown in nutrient solution for 7days under moderate salinity (0 and 50mMNaCl) with and without extra addition of 5mMCaSO(4) to investigate the seedling-ion homeostasis under salinity. In the leaf protoplasts [Ca2+](cyt), [Na+](cyt) and pH(cyt) were detected using acetoxymethyl esters of the ion-specific dyes, Fura 2, SBFI and BCECF, respectively, and fluorescence microscopy. In addition, both cultivars were grown for 3weeks at 0, 50 and 125mMNaCl with, or without, extra addition of 5mMCaSO(4) to detect overall Na+ and Ca2+ concentrations in leaves and salinity effects on dry weights. In both cultivars, salinity decreased [Ca2+](cyt), while at extra Ca2+ supplied, [Ca2+](cyt) increased. The [Ca2+](cyt) increase was accompanied by increase in the overall Ca2+ concentrations in leaves and decrease in the overall Na+ concentration. Moreover, irrespective of Ca2+ treatment under salinity, the cultivars reacted in different ways; [Na+](cyt) significantly increased only in cv. Vinjett, while pH(cyt) increased only in cv. Seds1. Even at rather high total Na+ concentrations, the cytosolic concentrations were kept low in both cultivars. It is discussed whether the increase of [Ca2+](cyt) and pH(cyt) can contribute to salt tolerance and if the cytosolic changes are due to changes in overall Ca2+ and Na+ concentrations.
Place, publisher, year, edition, pages
2013. Vol. 149, no 3, 321-328 p.
IdentifiersURN: urn:nbn:se:su:diva-96090DOI: 10.1111/ppl.12036ISI: 000325623800003OAI: oai:DiVA.org:su-96090DiVA: diva2:664222
Islamic Developmental Bank (IDB), Jeddah, Saudi Arabia; Sweden Institute (SI) 2013-11-142013-11-112013-11-14Bibliographically approved