Salt stress response of cauliflower (Brassica oleracea var. botrytis) seedlings under different LED light wavelengths
Abstract
Cauliflower is one of the major brassica vegetables that receive attention due to the presence of glucosinolates that are known to have health benefits. These metabolites are a part of plant defence system and influenced under stress conditions. Light Emitting Diodes (LED) are gaining interest as to provide artificial light at different wavelengths that modulate morphological, physiological and biochemical responses of plants. The objective of the present study was to explore salt stress response of cauliflower (Brassica oleracea var. botrytis) seedlings that are grown under different LED light wavelengths in terms of morphological parameters, antioxidant enzyme activities and glucosinolate contents. The seedlings were treated with 200 mM NaCl to generate salt stress or without NaCl as the control and were grown under different LED light wavelengths including red, blue, red+blue, red+far red, blue+far red and white (control) lights. Shoot and root growth parameters, antioxidant enzymes activity (CAT, SOD, APX), H2O2 content, aliphatic and indole glucosinolates were determined. The findings revealed that salt and light treatments independently influenced shoot and root growth. The antioxidant enzymes CAT and APX activities were highest in the control plants of blue and blue+far red lights whereas SOD activity was highest in salt treated plants under blue light. Aliphatic and indole glucosinolate content varied among LED light treatments. Salt treatment decreased the aliphatics while indoles particularly the glucobrassisin was increased with the influence of salinity and light wavelengths. The results demonstrated the salt stress response of cauliflower seedlings by elucidating changes in the antioxidant enzymes, glucosinolate contents, major shoot and root growth parameters under a range of different light wavelengths. These findings may provide a comprehensive understanding of the influence of different light wavelengths in mediating plant stress response.
Keywords
Cauliflower, Antioxidant enzymes, Glucosinolates, LED lights, Salinity
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