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Differential Expression and Internal Feedback Regulation
of
1-Aminocyclopropane-1-Carboxylate Synthase,
1-Aminocyclopropane-1-Carboxylate Oxidase, and
Ethylene Receptor
Genes in Tomato Fruit during Development and Ripening1
Akira Nakatsuka2,
Shiho Murachi,
Hironori Okunishi,
Shinjiro Shiomi,
Ryohei Nakano,
Yasutaka Kubo, and
Akitsugu Inaba*
Laboratory of Postharvest Agriculture, Faculty of
Agriculture, Okayama University, Tsushima, Okayama, 700-8530 Japan
We
investigated the feedback regulation of ethylene biosynthesis in tomato
(Lycopersicon esculentum) fruit with respect to the
transition from system 1 to system 2 ethylene production. The abundance
of LE-ACS2, LE-ACS4, and
NR mRNAs increased in the ripening fruit concomitant
with a burst in ethylene production. These increases in mRNAs with
ripening were prevented to a large extent by treatment with
1-methylcyclopropene (MCP), an ethylene action inhibitor. Transcripts
for the LE-ACS6 gene, which accumulated in
preclimacteric fruit but not in untreated ripening fruit, did accumulate in ripening fruit treated with MCP. Treatment of young fruit
with propylene prevented the accumulation of transcripts for this gene.
LE-ACS1A, LE-ACS3, and
TAE1 genes were expressed constitutively in the fruit
throughout development and ripening irrespective of whether the fruit
was treated with MCP or propylene. The transcripts for
LE-ACO1 and LE-ACO4 genes already existed in preclimacteric fruit and increased greatly when ripening commenced. These increases in LE-ACO mRNA with ripening were also
prevented by treatment with MCP. The results suggest that in tomato
fruit the preclimacteric system 1 ethylene is possibly mediated via constitutively expressed LE-ACS1A and
LE-ACS3 and negatively feedback-regulated LE-ACS6 genes with preexisting LE-ACO1
and LE-ACO4 mRNAs. At the onset of the climacteric
stage, it shifts to system 2 ethylene, with a large accumulation of
LE-ACS2, LE-ACS4, LE-ACO1,
and LE-ACO4 mRNAs as a result of a positive feedback
regulation. This transition from system 1 to system 2 ethylene
production might be related to the accumulated level of
NR mRNA.
1
This work was supported in part by a
grant-in-aid (no. 08456020 to A.I.) from the Ministry of Education,
Science, Sports and Culture of Japan.
2
Present address: Laboratory of Horticultural
Breeding, Faculty of Life and Environmental Science, Shimane
University, Matsue, Shimane, 690-8504, Japan.
*
Corresponding author; e-mail enri{at}ccew2.cc.okayama-u.ac.jp; fax
81-86-251-8338.
Plant Physiol. (1998) 118: 1295-1305
Copyright Clearance Center: 0032-0889/98/118//11
© 1998 American Society of Plant Physiologists
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