Effects of a short-day treatment on pool size, synthesis, degradation and transport of 3-indole-acetic acid in Scots pine (Pinus sylvestris L.) seedlings |
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| Authors: | Göran Sandberg Per-Christer Odén |
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| Institution: | Dept. of Forest Genetics and Plant Physiology, The Swedish Univ. of Agricultural Sciences, S-901 83 Umeå, Sweden. |
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| Abstract: | The effects of a short-day treatment on pool-size, synthesis, degradation, and transport of 3-indole-acetic acid (IAA) in Scots pine ( Pinus sylvestris L.) seedlings were studied. The short-day treatment decreased the pool of free IAA in the needles but did not significantly affect the pool-sizes of free IAA in the shoot-axis, hypocotyls, cotyledons and roots. The bound alkali-hydrolysable IAA-pools were not affected by the short-day treatment. The synthesis and degradation of radioactive IAA were also unaffected by the short-day treatment. The transport of radioactive IAA was greatest from needles to roots, and this transport was significantly decreased by the short-day treatment. |
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