Influence of nickel stress on growth and some important physiological/biochemical attributes in some diverse canola (Brassica napus L.) cultivars

M. A. Ali, M. Ashraf, H. R. Athar

    Research output: Contribution to journalArticlepeer-review

    Abstract

    To assess the effect of nickel on six canola cultivars a series of experiments were conducted. On the basis of shoot dry weight cvs. Shiralee and Range found to be nickel tolerant, Dunkeld and Ester as nickel sensitive, while the remaining cultivars intermediate. Nickel accumulation in shoots was lower in the nickel sensitive cultivars followed by that in the tolerant ones. Leaf water and osmotic potentials decreased significantly due to high concentration of Ni 2+. Decrease in osmotic potential was positively associated with accumulation of total free amino acids. By comparing accumulation of individual amino acids, pattern of accumulation of the amino acids was different in different cultivars. However, only histidine, serine and cysteine increased in appreciable amount in the xylem sap of different canola cultivars. Overall, nickel tolerant cultivars Shiralee and Range showed higher levels of histidine, serine and cysteine under varying levels of nickel than the others. This higher accumulation of histidine, serine and cysteine was positively related to nickel tolerance in all canola cultivars. Thus, differential nickel tolerance in canola cultivars proposed to be associated with relative detoxification of Ni by developing complexes with histidine, serine and cysteine and can be used as potential indicators of nickel tolerance in canola. © 2009 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)964-969
    Number of pages5
    JournalJournal of Hazardous Materials
    Volume172
    Issue number2-3
    DOIs
    Publication statusPublished - 30 Dec 2009

    Keywords

    • Amino acids
    • Brassica napus L.
    • Ni accumulation
    • Osmotic potential
    • Soluble proteins
    • Soluble sugars

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