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Stage- and Tissue-Specific Expression of Ethylene Receptor
Homolog Genes during Fruit Development in Muskmelon1
Kumi Sato-Nara,
Ken-Ichi Yuhashi2,
Katsumi Higashi3,
Kazushige Hosoya,
Mitsuru Kubota, and
Hiroshi Ezura*
Plant Biotechnology Institute, Ibaraki Agricultural Center, Iwama,
Nishi-ibaraki 319-0292, Japan
We
isolated two muskmelon (Cucumis melo) cDNA homologs of
the Arabidopsis ethylene receptor genes ETR1 and
ERS1 and designated them Cm-ETR1
(C.
melo
ETR1; accession no. AF054806) and
Cm-ERS1 (C.
melo
ERS1; accession no. AF037368), respectively.
Northern analysis revealed that the level of Cm-ERS1
mRNA in the pericarp increased in parallel with the increase in fruit
size and then markedly decreased at the end of enlargement. In fully
enlarged fruit the level of Cm-ERS1 mRNA was low in all
tissues, whereas that of Cm-ETR1 mRNA was very high in
the seeds and placenta. During ripening Cm-ERS1 mRNA increased slightly in the pericarp of fruit before the marked increase
of Cm-ETR1 mRNA paralleled climacteric ethylene
production. These results indicate that both Cm-ETR1 and
Cm-ERS1 play specific roles not only in ripening but
also in the early development of melon fruit and that they have
distinct roles in particular fruit tissues at particular developmental
stages.
1
This work was supported by a Grant-in-Aid from
the Science and Technology Agency of Japan.
2
Present address: Institute of Genetic Ecology,
Tohoku University, Sendai 980-8577, Japan.
3
Present address: Institute of
Biological Sciences, University of Tsukuba, Tsukuba 305-8572, Japan.
*
Corresponding author; e-mail ezura{at}nocs.tsukuba-noc.affrc.go.jp;
fax 81-299-45-8351.
Plant Physiol. (1999) 120: 321-330
Copyright Clearance Center: 0032-0889/99/120//10
© 1999 American Society of Plant Physiologists
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