Effect of zeatin on the growth and indolyl-3-acetic acid and abscisic acid levels in maize roots |
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Authors: | M Bourquin P-E Pilet |
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Institution: | Inst. of Plant Biology and Physiology of the Univ., CH-1015 Lausanne, Switzerland. |
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Abstract: | 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 14C]-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. |
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Keywords: | Abscisic acid cytokinin (zeatin) hormonal interaction indolyl-3-acetic acid maize root growth1 Zea mays |
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