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Plant Physiol, December 1999, Vol. 121, pp. 1273-1279
An Expansin Gene Expressed in Ripening Strawberry
Fruit1
Pedro Marcos
Civello,2
Ann L.T.
Powell,
Adnan
Sabehat,3 and
Alan B.
Bennett*
Mann Laboratory, Department of Vegetable Crops, University of
California, Davis, California 95616
Tissue
softening accompanies the ripening of many fruit and initiates the
processes of irreversible deterioration. Expansins are plant cell wall
proteins proposed to disrupt hydrogen bonds within the cell wall
polymer matrix. Expression of specific expansin genes has been observed
in tomato (Lycopersicon esculentum) meristems, expanding
tissues, and ripening fruit. It has been proposed that a tomato
ripening-regulated expansin might contribute to cell wall polymer
disassembly and fruit softening by increasing the accessibility of
specific cell wall polymers to hydrolase action. To assess whether
ripening-regulated expansins are present in all ripening fruit, we
examined expansin gene expression in strawberry (Fragaria × ananassa Duch.).
Strawberry differs significantly from tomato in that the fruit is
derived from receptacle rather than ovary tissue and strawberry is
non-climacteric. A full-length cDNA encoding a ripening-regulated
expansin, FaExp2, was isolated from strawberry fruit.
The deduced amino acid sequence of FaExp2 is most closely related to an
expansin expressed in early tomato development and to expansins
expressed in apricot fruit rather than the previously identified tomato
ripening-regulated expansin, LeExp1. Nearly all previously identified
ripening-regulated genes in strawberry are negatively regulated by
auxin. Surprisingly, FaExp2 expression was largely
unaffected by auxin. Overall, our results suggest that expansins are a
common component of ripening and that non-climacteric signals other
than auxin may coordinate the onset of ripening in strawberry.
1
This research was supported by U.S. Department
of Agriculture National Research Initiative Competitive Grants Program
(grant no. 97-35304-4627). P.M.C. was supported by a fellowship from Consejo Nacional de Investigaciones Científicas y
Técnicas, Argentina.
2
Present address: Instituto Tecnológico de
Chascomús, Camino Circunvalación Laguna Km 6, Casilla de
Correo 164, (7130) Chascomús, Argentina.
3
Present address: StePac L.A., Tefen Industrial
Park, P.O. Box 73, Tefen 24959, Israel.
*
Corresponding author; e-mail abbennett{at}ucdavis.edu; fax
530-752-4554.
© 1999 American Society of Plant Physiologists
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