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Abscisic acid induced stress‐like polyamine pattern in wheat seedlings, and its reversal by potassium ions
Author(s) -
Aurisano Nicoletta,
Bertani Alcidc,
Mattana Monica,
Reggiani Remo
Publication year - 1993
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1993.tb05274.x
Subject(s) - putrescine , abscisic acid , arginine decarboxylase , ornithine decarboxylase , polyamine , shoot , spermidine , potassium , chemistry , arginine , endogeny , ornithine , horticulture , biochemistry , biology , enzyme , amino acid , organic chemistry , gene
In 3‐day‐old wheat ( Triticum aestivum L. cv. Marinat) seedlings, 100 μ M ABA blocked the growth and altered the level of K + in both the shoot and root. The presence of ABA increased the putrescine titer during a 24‐h treatment. Increasing the endogenous level of K + by the addition of 10 m M KCl to the ABA‐treated seedlings, inhibited the effect of ABA on growth and putrescine level. In both tissues, ABA increased putrescine content at low concentrations (1 μ M ), reaching the maximal effect at 100 μ M . Putrescine increase induced by ABA was inhibited by both α‐difluoromethylarginine (DFMA) and α‐difluoromethylornithine (DFMO) in shoots while only the inhibitor of arginine decarboxylase was effective in the root. The presence of ABA modulated, in opposite ways, ornithine and arginine decarboxylase activities. These results are discussed in relation to ion balance under stress.