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Molecular Plant Advance Access published online on August 13, 2008
Molecular Plant, doi:10.1093/mp/ssn042
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© The Author 2008. Published by the Molecular Plant Shanghai Editorial Office in association with Oxford University Press on behalf of CSPP and IPPE, SIBS, CAS.

Arabidopsis Kinesins HINKEL and TETRASPORE Act Redundantly to Control Cell Plate Expansion during Cytokinesis in the Male Gametophyte

Sung-Aeong Oha,c, Valérie Bourdonb, Madhumita Das ‘Pala, Hugh Dickinsonb and David Twella,1

a Department of Biology, University of Leicester, University Road, Leicester LE1 7RH, UK
b Department of Plant sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK
c Present address: Division of Plant Biosciences, Kyungpook National University, Daegu 702-701, South Korea

1 To whom correspondence should be addressed. E-mail twe{at}le.ac.uk, fax +44(0)116 2523330, tel. +44(0)116 2522281.

Asymmetric cell division at pollen mitosis I (PMI) is required to specify the differential fate of the daughter vegetative and generative cells. Cytokinesis at PMI displays specialized features, and it has been suggested that there might be distinct molecular pathways underpinning different modes of cytokinesis in plants. Activation of the NACK–PQR MAP kinase signaling pathway, which is essential for somatic cell cytokinesis in tobacco, depends upon the NACK1 and NACK2 kinesin-related proteins. Their Arabidopsis orthologs, HINKEL (HIK) and TETRASPORE (TES), were reported to be essential for cytokinesis in somatic cells and in microsporocytes, respectively. More recently, HIK and TES were shown to have a functionally redundant role in female gametophytic cytokinesis. We report here that HIK and TES are co-expressed in microspores and developing pollen, and, through analysis of microspore and pollen development in double heterozygote mutants, the occurrence of cell plate expansion defects during cytokinesis at PMI. The data demonstrate a functionally redundant role for HIK and TES in cell plate expansion during male gametophytic cytokinesis, extending the concept that different modes of cytokinesis are executed by a common signaling pathway, but reinforcing the individuality of gametophytic cytokinesis in its requirement for either TES or HIK.


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