Effects of osmotic stress on polar auxin transport in Avena mesocotyl sections

Sheldrake, A R (1979) Effects of osmotic stress on polar auxin transport in Avena mesocotyl sections. Planta, 145 (2). pp. 113-117. ISSN 0032-0935

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Segments of mesocotyls of Avena sativa L. transported [1-14C]indol-3yl-acetic acid (IAA) with strictly basipetal polarity. Treatment of the segments with solutions of sorbitol caused a striking increase in basipetal auxin transport, which was greatest at concentrations around 0.5 M. Similar effects were observed with mannitol or quebrachitol as osmotica, but with glucose or sucrose the increases were smaller. Polar transport was still detectable in segments treated with 1.2 M sorbitol. The effects of osmotic stress on the polar transport of auxin were reversible, but treatment with sorbital solutions more concentrated than 0.5 M reduced the subsequent ability of mesocotyl segments to grow in response to IAA. The increased transport of auxin in the osmotically stressed segments could not be explained in terms of an increased uptake from donor blocks. The velocity of transport declined with higher concentrations of osmoticum. The reasons for the enhancement of auxin transport by osmotic stress are not known.

Item Type: Article
Uncontrolled Keywords: Auxin transport, Avena, Mesocotyl segments, Osmotic stress, Sorbitol
Subjects: Others
Depositing User: Mr Ramesh K
Date Deposited: 14 Sep 2016 04:22
Last Modified: 14 Sep 2016 04:22
URI: http://oar.icrisat.org/id/eprint/9656
Official URL: http://dx.doi.org/10.1007/BF00388706
Acknowledgement: This work was carried Out in the Department of Biochemistry of the University of Cambridge during the tenure of the Royal Society Rosenheim Research Fellowship. I thank Professor Sir Frank Young, F.R.S., for making research facilities available to me.
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