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Plant and Cell Physiology Advance Access originally published online on November 19, 2007
Plant and Cell Physiology 2008 49(1):121-125; 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 email: journals.permissions@oxfordjournals.org

Short Communication

The Autoregulation of Nodulation Mechanism is Related to Leaf Development

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

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

*Corresponding author: E-mail, ohyama{at}agr.niigata-u.ac.jp; Fax, +81-25-262-6643.


  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. A microscopic study showed that NOD1-3 and NOD3-7 produced small-size leaves due to the smaller number of leaf cells, compared with the 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 finding 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

Abbreviations: AON, autoregulation of nodulation; SAM, shoot apical meristem.

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