Significance of abscisic acid (aba) in low temperature stress in globe artichoke (Cynara scolymus l.) cultivars
1995
Baricevic, D. (Ljubljana Univ. (Slovenia). Biotechnical Fac., Agronomy Dept.)
In the low temperature conditions exogenous abscisic acid (ABA, 7.57.10** (-4) M) highly reduced growth of globe artichoke plants. Response intensity was cultivar (cv, cvs) dependent. Contrary to this, exogenous ABA when applied at 25 deg C had no effect on plant growth. Endogenous ABA contents was determined in 2 cvs which differed in earliness, e.g. cv 'Cheops' and 'Violpop'. In both cvs, exposed to low temperature stress, ABA concentration increased significantly (172.5 pmoles/g fresh weight (fw) in cv 'Cheops' and 207.3 pmoles/g fw in cv 'Violpop') with regard to normal growth conditions (57.0 pmoles/g fw in cv 'Cheops' and 69.3 pmoles/g fw in cv 'Violpop'). In the case of foliar application of ABA before the onset of stress temperature, both cvs increased their endogenous ABA concentration to a higher extent, but its level in cv 'Cheops' was so high that distinction between cvs was obvious (cv 'Cheops' developed 2332.5 pmoles/g fw and cv 'Violpop' 740.6 pmoles of ABA/g fw). We suppose, that after testing a much greater number of globe artichoke cvs, the endogenous ABA contents in ABA-treated globe artichoke exposed to stress temperature could be introduced as a new criterion of mutual distinction between cvs, which is an important condition for their official release (DUS-distinctness, uniformity, stability).
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