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(Received for publication, May 13, 1997, and in revised form, July 7, 1997)
From the Instituto de Recursos Naturales y Agrobiología,
CSIC, Apartado 1052, 41080 Sevilla, Spain
A small heat shock protein (sHSP) gene from
sunflower, Ha hsp17.6 G1, showed expression patterns that
differ from what is known for members of this gene family. The
mRNAs of this gene accumulated in seeds during late desiccation
stages of zygotic embryogenesis but not in response to heat shock in
vegetative tissues. The failure to respond to heat shock was
independent of the developmental stage after germination and shock
temperature. Nuclear run-on analyses demonstrated that transcription
from the Ha hsp17.6 G1 promoter is not induced by heat
shock. This agrees with the presence, in this promoter, of sequences
with little similarity to heat shock elements. Our results show an
evolutionary divergence, in the regulation of plant sHSP genes, which
has originated stress-responsive genes and nonresponsive members within
this gene family. We discuss implications for mechanisms controlling the developmental regulation of sHSP genes in plants.
Volume 272, Number 43,
Issue of October 24, 1997
pp. 27470-27475
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
A Plant Small Heat Shock Protein Gene Expressed during Zygotic
Embryogenesis but Noninducible by Heat Stress
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