Higher flower bud formation in haploid tobacco is connected with higher peroxidase/IAA-oxidase activity,lower IAA content and ethylene production |
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Authors: | V Žárský Libuše Pavlová J Eder Ivana Macháčková |
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Institution: | (1) Institute of Experimental Botany, Czechoslovak Academy of Sciences, Vltavská, 17,150 00 Praha 5;(2) Ke dvoru 15, 166 00 Praha 6, Czechoslovakia |
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Abstract: | Haploid tobacco plants (cv. Samsun) form inflorescences with a larger number of flowers than diploid plants. Leaves of haploid
plants were shown to have lower free IAA level (by 40 %), higher peroxidase (by 160 %) and IAA-oxidase (by 70 %) activities
and produce less ethylene (by 25 %) than leaves of corresponding diploid plants. The increase of peroxidase activity in haploids
was due to the increase in the activity of the cathodic isozyme which is known to have high IAA-oxidase activity. It is proposed
that higher peroxidase/IAA-oxidase activity in haploid plants may take part in IAA catabolism, at least duringin vitro culture of haploid explants. Lowered IAA level and ethylene production may then be directly correlated with a larger number
of flower buds; as a higher IAA level is generally considered to act as a background inhibitor of flowering. |
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