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Effect of zeatin on the growth and indolyl‐3‐acetic acid and abscisic acid levels in maize roots
Author(s) -
Bourquin M.,
Pilet P.E.
Publication year - 1990
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.1399-3054.1990.tb00051.x
Subject(s) - abscisic acid , zeatin , elongation , auxin , acetic acid , zea mays , chemistry , gibberellin , poaceae , indole 3 acetic acid , botany , cytokinin , biochemistry , biology , agronomy , materials science , ultimate tensile strength , metallurgy , gene
Elongation, indolyl‐3‐acetic acid (IAA) and abscisic acid (ABA) levels, – gas chromatography‐mass spectrometry quantification –, in the elongating zone were analysed for maize ( Zea mays L., Cv. LG11) roots immersed in buffer solution with or without zeatin (Z). The effect of Z depends on the initial extension rate of roots. The slower growing roots are more strongly inhibited by Z (10 −7 −10 −5 M ) and they show a greater increase in IAA and ABA content. When compared to the rapidly growing roots, the larger reactivity of the 'slow’ones cannot be attributed to a higher Z uptake as shown when using [ 14 C]‐Z. It is suggested that Z could regulate root elongation by acting on the IAA and/or ABA level. The comparative action of these two hormones is discussed.