ORIGINAL RESEARCH
Endogenous Minerals Conditioned Genotypic Variation of Phytochemicals in Broccoli Leaves under Salinity Stress
 
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Dry Land Farming and Oasis Cropping Laboratory, Institute of Arid Regions of Medenine, University of Gabes, Medenine 4119, Tunisia
CORRESPONDING AUTHOR
Chokri Zaghdoud   

Dry Land Farming and Oasis Cropping Laboratory, Institute of Arid Regions of Medenine, University of Gabes, Medenine 4119, Tunisia, Tunisia
Submission date: 2020-06-06
Final revision date: 2020-08-15
Acceptance date: 2020-08-18
Online publication date: 2021-01-28
 
 
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ABSTRACT
Here, changes in the leaf mineral composition of broccoli (Brassica oleracea L. var. italica Plenck) plants in response to single and interactive two-week salt (0, 30, 60 and 90 mM NaCl) exposure and cultivar (cvs. Parthenon and Naxos) factors were studied, as well as their correlations with individual glucosinolates (GSLs), vitamin C and total anthocyanins. Results showed significant differences in micro- (Fe2+, Cu2+, Zn2+, Mn2+ and B3+) and macroelements (S, N, C, NH4 +) contents regarding the studied factors and/or their interaction. Salinity effects on individual GSLs showed contradictor behaviours between both cultivars, being the increase in aliphatics in Parthenon negatively correlated with Mn2+ ions, while the decrease in indolics in Naxos related positively with N and N/S ratio and negatively with NH4 + content (P<0.01). Interestingly, only in cv. Naxos all bioactive compounds displayed a strong relationship with Zn2+ ions, majorly negative. Stress intensity-dependant reductions in vitamin C and total anthocyanin levels in both cultivars were caused by differential endogenous NH4 + ions accumulation, reflecting co-participation of these compounds in the leaf antioxidant capacity. Overall, in salt-affected lands, a clear genotypic dependence of broccoli plants regarding endogenous leaf minerals was recorded, influencing individual GSLs, vitamin C and total anthocyanin profiles.
eISSN:2083-5906
ISSN:1230-1485