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