Abstract
ABSTRACTEffect of salt stress and subsequent re-watering on growth and electrophysiological characteristics of Orychophragmus violaceus and Brassica napus was investigated, to construct a model for prediction of an appropriate regime for dilution of saline water. Different concentrations of NaCl, Na2SO4 and blend of both salts were applied with Hoagland solution. Growth and electrophysiology traits were highly restricted at high concentration levels. According to the results, the best dilution point was 5–2.5% for NaCl and Na2SO4 alternatively, whereas it was 10–0.0% for blend of salts. After re-watering, O. violaceus restore better leaf tensity under medium levels, because the effect of NaCl concentration on leaf tensity (XNC–LT) was 1.66%, which was lower in O. violaceus than the effect of XNC–LT (2.88%) in B. napus, followed by the same trend for all treatments. Therefore, the effect of salinity in O. violaceus and B. napus may also be reduced effectively by dilution of saline irrigation.
Highlights
In abiotic stresses, drought and salinity are two environmental factors which are responsible for the huge loss in agricultural demand and productivity all over the world (Gul & Ahmad 2004)
The high concentration blend of salts affects O. violaceus compared with single salts and caused a more prominent decrease in the water content (WC) and Ψ compared with B. napus
In the re-watering phase, the outcome of the results showed that WC and Ψ of both O. violaceus and B. napus were recovered (Tables 4 and 5)
Summary
Drought and salinity are two environmental factors which are responsible for the huge loss in agricultural demand and productivity all over the world (Gul & Ahmad 2004). At the current situation of intentions of improving agricultural production under limited water resources, it is required to grow crops that are capable of tolerating drought and water stress environment (Yao et al 2016). It would be the most economical approach to improve productivity based on limited water resources. Most species of brassica are considered to be moderate salttolerant (Masidur Alam et al 2007) Their growth and yield were markedly reduced due to stresses (Su et al 2013) and the production of edible oil crops was affected at a distressing rate due to rising issues of water and soil salinization (García-Sánchez et al 2002). Later on the experiment was conducted to emphasize on plants physiognomies under water and salt stress (Zhang et al 2012; Benincasa et al 2013; de Oliveira et al 2013)
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