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Author Spotlight: A High-Resolution, Single-Grain, In Vivo Pollen Hydration Bioassay for Arabidopsis thaliana
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Pollen structure and function in caesalpinioid legumes.

Hannah Banks1, Paula J Rudall2

  • 1Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, UK h.banks@kew.org.

American Journal of Botany
|March 6, 2016
PubMed
Summary
This summary is machine-generated.

Pollen diversity in the legume subfamily Caesalpinioideae varies greatly, particularly in early lineages. Specific pollen structures may indicate pollination syndromes and adaptations for survival.

Keywords:
CaesalpinoideaeLeguminosaeexine morphologypollen germinationpollen structurepollination syndromes

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Area of Science:

  • Plant reproductive biology
  • Palynology
  • Evolutionary botany

Background:

  • The legume subfamily Caesalpinioideae exhibits diverse pollen morphologies, especially in early-branching lineages.
  • Previous research suggests links between pollen surface features, pollination syndromes, and functional adaptations like desiccation tolerance.

Purpose of the Study:

  • To investigate the diversity of pollen morphology in Caesalpinioideae.
  • To explore potential correlations between pollen structures, pollination strategies, and functional adaptations.

Main Methods:

  • Utilized light microscopy, scanning electron microscopy, and transmission electron microscopy to examine pollen.
  • Conducted a literature survey of pollination vectors within Caesalpinioideae.

Main Results:

  • Pollen structural diversity is highest in the early-branching tribes Cercideae and Detarieae.
  • Functional adaptations for desiccation tolerance include opercula and reduced aperture size.
  • Structures like colpi variations and supratectal ornamentation aid in preventing wall rupture during hydration/dehydration cycles.

Conclusions:

  • Pollen characters in Detarieae and Cercideae may help infer unknown pollination systems.
  • Iterative evolution of supratectal verrucae and gemmae observed in Cercideae and Detarieae.
  • Striate/verrucate pollen patterns show a potential correlation with vertebrate pollination.