Angiosperm Flora of India

Apoplastic Na+ in Vicia faba Leaves Rises After Short-Term Salt Stress and Is Remedied by Silicon

Publication Type:Journal Article
Year of Publication:2013
Authors:Shahzad, M, Zörb, C, Geilfus, C-M, MÜHLING, KH
Journal:Journal of Agronomy and Crop Science
Date Published:2013
ISBN Number:1439-037X
Keywords:apoplast, Field bean, Growth, Na+ toxicity, oertli hypothesis, Salinity, silicon, Vicia

Salinity primarily affects plants by inhibiting shoot growth. Salt-sensitive plants have been suggested to accumulate Na+ within their leaf apoplast under salinity, leading to a reduced water status. Evidence related to apoplastic Na+ accumulation is still enigmatic. We have focused on the effect of a short-term salt treatment by using the salt-sensitive Vicia faba. Moreover, we have examined the role of silicon in alleviating sodium accumulation in the apoplast. Salt-sensitive field beans have been subjected to increasing levels of salinity, with and without the addition of silicon under hydroponic conditions. We have demonstrated that the dicot Vicia faba exhibits a rise in Na+ concentration in the leaf apoplast at higher salinity levels; this is significantly ameliorated by the addition of silicon. Further, enhanced shoot growth under high salt treatment in the presence of added silicon is correlated with a significant decrease in Na+ concentration in the leaves. The novelty of the current study is the detection of a high Na+ concentration in the leaf apoplast of the salt-sensitive dicot field bean. Our results support Oertli's hypothesis that extracellular salt accumulation can lead to wilting leaves, plant growth reduction and cell death.

Short Title:Journal of Agronomy and Crop Science
Taxonomic name: 
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