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Plant Physiol, May 2000, Vol. 123, pp. 393-402
The Yeast HAL1 Gene Improves Salt Tolerance of
Transgenic Tomato1
Carmina
Gisbert,*
Ana M.
Rus,
M. Carmen
Bolarín,
J. Miguel
López-Coronado,
Isabel
Arrillaga,2
Consuelo
Montesinos,
Manuel
Caro,
Ramon
Serrano, and
Vicente
Moreno
Instituto de Biología Molecular y Celular de
Plantas, Universidad Politécnica de Valencia-Consejo
Superior de Investigaciones Científicas, Laboratorio
Nine (C.G., I.A., V.M.), and Laboratorio Three (J.M.L.-C., C.M., R.S.)
Camino de Vera, 14, Universidad Politécnica de Valencia,
46022-Valencia, Spain; and Centro de Edafología y
Biología Aplicada del Segura, Consejo Superior de
Investigaciones Científicas, Apartado 4195, Murcia E-30080,
Spain (A.M.R., M.C.B., M.C.)
Overexpression of the HAL1 gene in yeast has a
positive effect on salt tolerance by maintaining a high internal
K+ concentration and decreasing intracellular
Na+ during salt stress. In the present work, the yeast gene
HAL1 was introduced into tomato (Lycopersicon
esculentum Mill.) by Agrobacterium
tumefaciens-mediated transformation. A sample of primary
transformants was self-pollinated, and progeny from both transformed
and non-transformed plants (controls) were evaluated for salt tolerance
in vitro and in vivo. Results from different tests indicated a higher
level of salt tolerance in the progeny of two different transgenic
plants bearing four copies or one copy of the HAL1 gene.
In addition, measurement of the intracellular K+ to
Na+ ratios showed that transgenic lines were able to retain
more K+ than the control under salt stress. Although plants
and yeast cannot be compared in an absolute sense, these results
indicate that the mechanism controlling the positive effect of the
HAL1 gene on salt tolerance may be similar in transgenic
plants and yeast.
1
This work was supported by the European Union
(project no. AIR-3 CT94-1508).
2
Present address: Departamento de
Fisiología Vegetal, Facultad de Farmacia, Campus de Burjassot,
Universidad de Valencia, 46100 Burjassot, Spain.
*
Corresponding author; e-mail cgisbert{at}ibmcp.upv.es; fax
34-96-3877859.
© 2000 American Society of Plant Physiologists
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