Plant Physiol. Illumina
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
QUICK SEARCH:   [advanced]


     

Plant Physiology Preview
Published on April 22, 2009; 10.1104/pp.109.136739

This Article
Right arrow Full Text (Plant Physiology Preview (PDF))
Right arrow Supplemental Data
Right arrow All Versions of this Article:
150/2/736    most recent
pp.109.136739v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Ikeda-Kawakatsu, K.
Right arrow Articles by Kyozuka, J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Ikeda-Kawakatsu, K.
Right arrow Articles by Kyozuka, J.
Agricola
Right arrow Articles by Ikeda-Kawakatsu, K.
Right arrow Articles by Kyozuka, J.

Received February 5, 2009
Accepted April 14, 2009

Expression Level of ABERRANT PANICLE ORGANIZATION 1 Determines Rice Inflorescence Form through Control of Cell Proliferation in the Meristem

Kyoko Ikeda-Kawakatsu , Naoko Yasuno , Tetsuo Oikawa , Shigeru Iida , Yasuo Nagato , Masahiko Maekawa , and Junko Kyozuka *

Research Institute for Bioresources, Okayama University, Kurashiki, Okayama, 710-0046 Japan; Graduate School of Agriculture and Life Sciences, University of Tokyo, Yayoi, Bunkyo, Tokyo 113-0032, Japan; National Institute for Basic Biology, Okazaki, 444-8585, Japan

* Corresponding author; email: akyozuka{at}mail.ecc.u-tokyo.ac.jp.

Two types of branches, rachis branches (i.e. non-floral) and spikelets (i.e. floral), are produced during rice inflorescence development. We previously reported that the ABERRANT PANICLE ORGANIZATION 1(APO1) gene, encoding an F-box containing protein orthologous to Arabidopsis UFO, suppresses precocious conversion of rachis branch meristems to spikelets to ensure generation of certain number of spikelets. Here, we identified four dominant mutants producing an increased number of spikelets and found that they are gain-of-function alleles of APO1. The APO1 expression levels are elevated in all four mutants suggesting that an increase of APO1 activity caused the delay in the program shift to spikelet formation. In agreement with this result, ectopic over expression of APO1 accentuated the APO1 gain-of-function phenotypes. In the apo1-D dominant alleles, the inflorescence meristem (IM) starts to increase in size more vigorously than the wild-type when switching to the reproductive development phase. This alteration in growth rate is opposite to what is observed with the apo1 mutants that have a smaller IM. The difference in meristem size is caused by different rates of cell proliferation. Collectively, these results suggest that the level of APO1 activity regulates the inflorescence form through control of cell proliferation in the meristem.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 2009 by the American Society of Plant Biologists