Impact of chloride (NaCl, KCl) and sulphate (Na₂SO₄, K₂SO₄) salinity on glucosinolate metabolism in Brassica rapa

Abstract

Seedlings of Brassica rapa were exposed to increasing concentrations of NaCl, Na2SO4, KCl and K2SO4 to study the effect on glucosinolate content, composition and expression of genes of the glucosinolate biosynthetic pathway and associated transcription factors. Growth was inhibited stronger by sulphate salts and strongest by Na2SO4. Aliphatic, indolic and aromatic glucosinolates were differently affected by the salts in shoot and roots. A decrease in aliphatic glucosinolates in shoots of plants exposed to chloride salts corresponded to a decreased gene expression of a key enzyme for their biosynthesis. Likewise, an increased level of indolic and aromatic glucosinolates by Na2SO4 coincided with an increased gene expression of enzymes responsible for the biosynthesis of these glucosinolates. The results show that changes in glucosinolate content and composition under salt stress depend on the ionic composition of the salts. This has implications for the quality of B. rapa grown under different types of salinity.

Involvement of Phenolic Acids in Short-Term Adaptation to Salinity Stress is Species-Specific among Brassicaceae

“…Long-term salinity stress (21 days) and exposure to chloride salts caused a decrease in aliphatic GLUs in shoots of B. rapa plants, corresponding to reduced transcript level of CYP79F1 coding for the key enzyme for their biosynthesis. Similarly, elevated levels of indole and aromatic GLUs by Na 2 SO 4 coincided with increased gene expression of enzymes responsible for the biosynthesis of these GLUs [32].…”

Salinity and flow rates of nutrient solution on cauliflower biometrics in NFT hydroponic system

“…Reduction of growth as a function of the cationic nature was also observed by Aghajanzadeh et al (2017), who studied the effect of different types of salts on glucosinolate contents and composition of Brassica rapa seedlings and observed variable response depending on the type of salts (NaCl, KCl, Na 2 SO 4 and K 2 SO 4 ) and part of the plant.…”

Water yield and consumption of cauliflower plants grown in a hydroponic system using brackish waters and different flow rates

“…Decreases in plant growth due to different cationic origin of waters (NaCl, KCl, Na 2 SO 4 , and K 2 SO 4 ) was also found by Aghajanzadeh et al (2018) for Brassica rapa L. seedlings, showing the effect of these salts on glucosinolate contents, composition and expression of genes of the glucosinolate biosynthetic route and transcription factors associated; they also found different response of different plant parts to the salts evaluated.…”