Fluctuation of endogenous cytokinins in leaves and roots of short-day and long-day tobacco associated with photoperiodic induction |
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Authors: | Veronika N Lozhnikova J Krekule Nataliya Dudko M Kh Chaïlakhyan |
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Institution: | (1) K. A. Timiryazev Institute of Plant Physiology, Academy of Sciences of USSR, Botanicheskaya 35, 127 273 Moscow, USSR;(2) Institute of Experimental Botany, Czechoslovak Academy of Sciences, Ke dvoru 15, 166 30 Praha 6, Czechoslovakia |
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Abstract: | As the dynamics of changes in phytohormones may be involved in photoperiodic regulation of the rates of growth and flowering,
fluctuation of cytokinins was followed in long-day and short-day tobacco. Zeatin (Z) and zeatin riboside (ZR) were identified
in leaves and roots using a GC-MSC system. In plants of the long-day tobaccoNicotiana silvestris increasing the number of long-day inductive for flowering (10, 20, 30, 40 LD) resulted in a rise in ZR activity. Half the
plants reached a reproductive stage on the 40th day of induction. In short-day Mam moth tobacco plants, short-day floral induction
(10, 20, 30, 40 SD) caused similar but less marked changes in ZR. |
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Keywords: | |
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