Genetic regulation of sporopollenin synthesis and pollen exine development

Tohru Ariizumi, Kinya Toriyama

Research output: Contribution to journalArticlepeer-review

318 Citations (Scopus)

Abstract

Pollen acts as a biological protector of male sperm and is covered by an outer cell wall polymer called the exine, which consists of durable sporopollenin. Despite the astonishingly divergent structure of the exine across taxa, the developmental processes of its formation surprisingly do not vary, which suggests the preservation of a common molecular mechanism. The precise molecular mechanisms underlying pollen exine patterning remain highly elusive, but they appear to be dependent on at least three major developmental processes: primexine formation, callose wall formation, and sporopollenin synthesis. Several lines of evidence suggest that the sporopollenin is built up via catalytic enzyme reactions in the tapetum, and both the primexine and callose wall provide an efficient substructure for sporopollenin deposition. Herein, we review the currently accepted understanding of the molecular regulation of sporopollenin biosynthesis and examine unanswered questions regarding the requirements underpinning proper exine pattern formation, as based on genetic evidence.

Original languageEnglish
Pages (from-to)437-460
Number of pages24
JournalAnnual Review of Plant Biology
Volume62
DOIs
Publication statusPublished - 2011 Jun 2
Externally publishedYes

Keywords

  • Arabidopsis
  • callose wall formation
  • exine patterning
  • primexine formation
  • rice
  • tapetum

ASJC Scopus subject areas

  • Physiology
  • Molecular Biology
  • Plant Science
  • Cell Biology

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