Transcriptome analysis of haploid male gametophyte development in Arabidopsis -: art. no. R85

被引:583
作者
Honys, D
Twell, D
机构
[1] Inst Expt Bot AS CR, CZ-16502 Prague 2, Czech Republic
[2] Charles Univ Prague, Fac Sci, Dept Plant Physiol, CZ-12844 Prague 2, Czech Republic
[3] Univ Leicester, Dept Biol, Leicester LE1 7RH, Leics, England
关键词
D O I
10.1186/gb-2004-5-11-r85
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Background: The haploid male gametophyte generation of flowering plants consists of two- or three-celled pollen grains. This functional specialization is thought to be a key factor in the evolutionary success of flowering plants. Moreover, pollen ontogeny is also an attractive model in which to dissect cellular networks that control cell growth, asymmetric cell division and cellular differentiation. Our objective, and an essential step towards the detailed understanding of these processes, was to comprehensively define the male haploid transcriptome throughout development. Results: We have developed staged spore isolation procedures for Arabidopsis and used Affymetrix ATHI genome arrays to identify a total of 13,977 male gametophyte-expressed mRNAs, 9.7% of which were male-gametophyte-specific. The transition from bicellular to tricellular pollen was accompanied by a decline in the number of diverse mRNA species and an increase in the proportion of male gametophyte-specific transcripts. Expression profiles of regulatory proteins and distinct clusters of coexpressed genes were identified that could correspond to components of gametophytic regulatory networks. Moreover, integration of transcriptome and experimental data revealed the early synthesis of translation factors and their requirement to support pollen tube growth. Conclusions: The progression from proliferating microspores to terminally differentiated pollen is characterized by large-scale repression of early program genes and the activation of a unique late gene-expression program in maturing pollen. These data provide a quantum increase in knowledge concerning gametophytic transcription and lay the foundations for new genomic-led studies of the regulatory networks and cellular functions that operate to specify male gametophyte development.
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页数:13
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