Plant Cell Advance Online Publication
Published on July 14, 2003; 10.1105/tpc.012401
Received April 9, 2003
Accepted June 10, 2003
The MSP1 Gene Is Necessary to Restrict the Number of Cells Entering into
Male and Female Sporogenesis and to Initiate Anther Wall Formation in Rice
Ken-Ichi Nonomura 1*, Kazumaru Miyoshi 1, Mitsugu Eiguchi 1, Tadzunu Suzuki 1, Akio Miyao 2, Hirohiko Hirochika 2, and Nori Kurata 3
1
Experimental Farm/Plant Genetics Laboratory, National Institute of Genetics, Yata1111,
Mishima, Shizuoka 411-8540, Japan
2
Department of Molecular Genetics, National Institute of Agrobiological Sciences,
Tsukuba, Ibaraki 305-8602, Japan
3
Experimental Farm/Plant Genetics Laboratory, National Institute of Genetics, Yata1111,
Mishima, Shizuoka 411-8540, Japan; Department of Life Science, Graduate University
for Advanced Studies, Yata1111, Mishima, Shizuoka 411-8540, Japan
* To whom correspondence should be addressed. E-mail: knonomur{at}lab.nig.ac.jp.
The function of the novel gene MSP1 (MULTIPLE SPOROCYTE), which
controls early sporogenic development, was elucidated by characterizing a retrotransposon-tagged
mutation of rice. The MSP1 gene encoded a Leu-rich repeat receptor-like
protein kinase. The msp1 mutation gave rise to an excessive number of both
male and female sporocytes. In addition, the formation of anther wall layers was
disordered and the tapetum layer was lost completely. Although the mutation never
affected homologous chromosome pairing and chiasma maintenance, the development of
pollen mother cells was arrested at various stages of meiotic prophase I, which resulted
in complete male sterility. Meanwhile, plural megaspore mother cells in a mutant
ovule generated several megaspores, underwent gametogenesis, and produced germinable
seeds when fertilized with wild-type pollen despite disorganized female gametophytes.
In situ expression of MSP1 was detected in surrounding cells of male and
female sporocytes and some flower tissues, but never in the sporocytes themselves.
These results suggest that the MSP1 product plays crucial roles in restricting
the number of cells entering into male and female sporogenesis and in initiating
anther wall formation in rice.
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