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Plant and Cell Physiology Advance Access published online on November 19, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm161
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

The autoregulation of nodulation mechanism is related to leaf development

Sayuri Ito1, Taichi Kato2, Norikuni Ohtake2, Kuni Sueyoshi2 and Takuji Ohyama2,*

1 Graduate School of Science and Technology, Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata, 950-2181, Japan
2 Faculty of Agriculture, Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata, 950-2181, Japan

Corresponding author: Takuji Ohyama; Faculty of Agriculture, Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata, 950-2181, Japan; Tel&Fax, +81-25-262-6643; E-mail, ohyama{at}agr.niigata-u.ac.jp


  Abstract

To understand the autoregulation of nodulation (AON) system, in which leguminous plants control the nodule number, we examined the details of the characteristics of hypernodulation soybean mutants NOD1-3 and NOD3-7. Microscopic study showed that NOD1-3 and NOD3-7 produced small-size leaves due to the smaller number of leaf cells, compared to Williams parent. These phenotypes were not affected by inoculation with bradyrhizobia or nitrate supply. The AON signaling might be related to the control system of leaf-cell proliferation. This hypothesis was strongly supported by the result that activation of AON in wild types by inoculation leads to an increase in the cell number of leaves.

Keywords: AON - cell - hypernodulation - leaf - nodule - soybean

(Received October 29, 2007; Accepted November 15, 2007)
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