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Plant Physiol, November 2000, Vol. 124, pp. 1087-1096
The Involvement of a Cysteine Proteinase in the Nodule
Development in Chinese Milk Vetch Infected with Mesorhizobium
huakuii subsp. rengei
Yuki
Naito,
Makoto
Fujie,
Shoji
Usami,
Yoshikatsu
Murooka, and
Takashi
Yamada*
Department of Molecular Biotechnology, Graduate School of Advanced
Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8527,
Japan (Y.N., M.F., S.U., T.Y.); and Department of Biotechnology,
Graduate School of Engineering, Osaka University, Suita 565-0871,
Japan (Y.M.)
Cys proteinases play important roles in plant cell development and
senescence. A cDNA, AsNODf32, obtained by differential screening of a
nodule cDNA library of the leguminous plant Chinese milk vetch
(Astragalus sinicus), represents a nodule-specific Cys
proteinase similar to that reported for the actinorhizal Alnus glutinosa-Flankia symbiosis. A
characteristic feature of this proteinase is the presence of a putative
vacuolar targetting signal, LQDA, within its propeptide. Expression of
the AsNODf32 gene, which was studied on northern blots
and in situ hybridization, showed good correlation with the onset of
nodule senescence. In situ hybridization studies revealed that
AsNODf32 was expressed in senescent-infected tissue at
the base of the nodule, as well as in interzone II-III of the infected
nodules. In addition to degrading old nodule tissues and bacteroids,
AsNODf32 protein may be required as a component of tissue remodeling
during nodule development.
*
Corresponding author; e-mail tayamad{at}ipc.hiroshima-u.ac.jp;
fax 81-824-24-7752.
© 2000 American Society of Plant Physiologists
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