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

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Relation http://oar.icrisat.org/9656/
http://dx.doi.org/10.1007/BF00388706
10.1007/BF00388706
 
Title Effects of osmotic stress on polar auxin transport in Avena mesocotyl sections
 
Creator Sheldrake, A R
 
Subject Others
 
Description 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.
 
Publisher Springer
 
Date 1979-01
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/9656/1/bf00388706.pdf
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