Distribution of orbicules in Annonaceae mirrors evolutionary trend in angiosperms

S. Huysmans, B. Verstraete, E. Smets, L.W. Chatrou

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)

Abstract

Background and aims - Orbicules or Ubisch bodies have been recorded in many angiosperm families and although the first observations date back to 1865, their function in the anther remains enigmatic. In flowering plants a general evolutionary trend is observed from common occurrence of orbicules in early diverging lineages towards a more patchy distribution in derived clades of eudicots. Annonaceae was our family of choice for an in depth study of orbicule distribution in early diverging angiosperms since it met the following three criteria: (1) high tapetum diversity, (2) orbicule presence and absence recorded, and (3) recent phylogeny at genus level available. Key results - Our SEM data of eighteen species show that orbicules are more common in Annonaceae than previously perceived. The resulting orbicule distribution pattern on the family topology indicates a consistent absence of orbicules in the 'long branch clade' while orbicules are present in Anaxagorea, the ambavioids, and the 'short branch clade'. Presence of orbicules is the ancestral condition in the family. Morphologically, Annonaceae orbicules are small (<1 µm), spherical and smooth. Conclusions - The orbicule distribution pattern in Annonaceae reflects the general evolutionary trend in flowering plants. We hypothesize that orbicule presence can be considered as a powerful proxy for non-amoeboid tapetum characterization in Annonaceae.
Original languageEnglish
Pages (from-to)199-211
JournalPlant Ecology and Evolution
Volume143
Issue number2
DOIs
Publication statusPublished - 2010

Fingerprint

Annonaceae
Angiospermae
anthers
topology
phylogeny

Keywords

  • asimina-triloba annonaceae
  • pollen wall development
  • sporoderm development
  • developmental events
  • callose dissolution
  • flowering plants
  • tapetum types
  • magnoliales
  • rubiaceae
  • characters

Cite this

Huysmans, S. ; Verstraete, B. ; Smets, E. ; Chatrou, L.W. / Distribution of orbicules in Annonaceae mirrors evolutionary trend in angiosperms. In: Plant Ecology and Evolution. 2010 ; Vol. 143, No. 2. pp. 199-211.
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abstract = "Background and aims - Orbicules or Ubisch bodies have been recorded in many angiosperm families and although the first observations date back to 1865, their function in the anther remains enigmatic. In flowering plants a general evolutionary trend is observed from common occurrence of orbicules in early diverging lineages towards a more patchy distribution in derived clades of eudicots. Annonaceae was our family of choice for an in depth study of orbicule distribution in early diverging angiosperms since it met the following three criteria: (1) high tapetum diversity, (2) orbicule presence and absence recorded, and (3) recent phylogeny at genus level available. Key results - Our SEM data of eighteen species show that orbicules are more common in Annonaceae than previously perceived. The resulting orbicule distribution pattern on the family topology indicates a consistent absence of orbicules in the 'long branch clade' while orbicules are present in Anaxagorea, the ambavioids, and the 'short branch clade'. Presence of orbicules is the ancestral condition in the family. Morphologically, Annonaceae orbicules are small (<1 µm), spherical and smooth. Conclusions - The orbicule distribution pattern in Annonaceae reflects the general evolutionary trend in flowering plants. We hypothesize that orbicule presence can be considered as a powerful proxy for non-amoeboid tapetum characterization in Annonaceae.",
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Distribution of orbicules in Annonaceae mirrors evolutionary trend in angiosperms. / Huysmans, S.; Verstraete, B.; Smets, E.; Chatrou, L.W.

In: Plant Ecology and Evolution, Vol. 143, No. 2, 2010, p. 199-211.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Distribution of orbicules in Annonaceae mirrors evolutionary trend in angiosperms

AU - Huysmans, S.

AU - Verstraete, B.

AU - Smets, E.

AU - Chatrou, L.W.

PY - 2010

Y1 - 2010

N2 - Background and aims - Orbicules or Ubisch bodies have been recorded in many angiosperm families and although the first observations date back to 1865, their function in the anther remains enigmatic. In flowering plants a general evolutionary trend is observed from common occurrence of orbicules in early diverging lineages towards a more patchy distribution in derived clades of eudicots. Annonaceae was our family of choice for an in depth study of orbicule distribution in early diverging angiosperms since it met the following three criteria: (1) high tapetum diversity, (2) orbicule presence and absence recorded, and (3) recent phylogeny at genus level available. Key results - Our SEM data of eighteen species show that orbicules are more common in Annonaceae than previously perceived. The resulting orbicule distribution pattern on the family topology indicates a consistent absence of orbicules in the 'long branch clade' while orbicules are present in Anaxagorea, the ambavioids, and the 'short branch clade'. Presence of orbicules is the ancestral condition in the family. Morphologically, Annonaceae orbicules are small (<1 µm), spherical and smooth. Conclusions - The orbicule distribution pattern in Annonaceae reflects the general evolutionary trend in flowering plants. We hypothesize that orbicule presence can be considered as a powerful proxy for non-amoeboid tapetum characterization in Annonaceae.

AB - Background and aims - Orbicules or Ubisch bodies have been recorded in many angiosperm families and although the first observations date back to 1865, their function in the anther remains enigmatic. In flowering plants a general evolutionary trend is observed from common occurrence of orbicules in early diverging lineages towards a more patchy distribution in derived clades of eudicots. Annonaceae was our family of choice for an in depth study of orbicule distribution in early diverging angiosperms since it met the following three criteria: (1) high tapetum diversity, (2) orbicule presence and absence recorded, and (3) recent phylogeny at genus level available. Key results - Our SEM data of eighteen species show that orbicules are more common in Annonaceae than previously perceived. The resulting orbicule distribution pattern on the family topology indicates a consistent absence of orbicules in the 'long branch clade' while orbicules are present in Anaxagorea, the ambavioids, and the 'short branch clade'. Presence of orbicules is the ancestral condition in the family. Morphologically, Annonaceae orbicules are small (<1 µm), spherical and smooth. Conclusions - The orbicule distribution pattern in Annonaceae reflects the general evolutionary trend in flowering plants. We hypothesize that orbicule presence can be considered as a powerful proxy for non-amoeboid tapetum characterization in Annonaceae.

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KW - rubiaceae

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