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Plant Physiol, December 1999, Vol. 121, pp. 1227-1237
Soil Compaction. A Role for Ethylene in Regulating Leaf Expansion
and Shoot Growth in Tomato?1
Ahmed
Hussain,*
Colin Ramsay
Black,
Ian Blackwood
Taylor, and
Jeremy Alan
Roberts
School of Biological Sciences, University of Nottingham, Sutton
Bonington Campus, Loughborough LE12 5RD, United Kingdom
The role of ethylene in regulating
growth in tomato (Lycopersicon esculentum Mill.) during
compaction stress was examined using wild-type (cv Ailsa Craig) and
transgenic (ACO1AS) genotypes; the latter has a reduced
capacity to produce ethylene. Ethephon or silver ions were applied to
increase ethylene production or block its action. Shoot growth in both
genotypes was comparable in uncompacted (1.1 g cm 3) and
uniformly compacted soil (1.5 g cm3). However, a
1.1/1.5-g cm3 split-pot treatment invoked marked
genotypic differences: growth was reduced in cv Ailsa Craig but was
comparable to uncompacted control plants in ACO1AS. As
xylem sap abscisic acid levels were similar, abscisic acid was not
responsible for inhibiting growth in cv Ailsa Craig. These genotypic
differences in growth were accompanied by increased ethylene evolution
in cv Ailsa Craig, suggesting that the ability of ACO1AS to
maintain growth in the split-pot treatment reflected its lower ethylene
levels, a view supported by the observation that excising the roots in
the compacted compartment reduced ethylene evolution and restored shoot
growth in cv Ailsa Craig. Treatment with silver restored shoot growth in cv Ailsa Craig, whereas treatment with ethephon reduced growth in
ACO1AS. Thus, ethylene apparently has a key role in
determining growth when tomato plants encounter differential soil compaction.
1
The work reported here was funded by the UK
Natural Environment Research Council and the Biotechnology and
Biological Sciences Research Council.
*
Corresponding author; e-mail sbxa2h{at}szn1.nottingham.ac.uk; fax
44-115-9516334.
© 1999 American Society of Plant Physiologists
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