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Papilionoid inflorescences revisited (Leguminosae-Papilionoideae)
1Royal Botanic Gardens, Kew, Jodrell Laboratory, Richmond, Surrey TW9 3DS, UK.
Annals of Botany
|December 14, 2012
Summary
The study reveals diverse inflorescence structures in legumes, highlighting reduction mechanisms and proposing a new hypothesis for pseudoraceme evolution. This research offers insights into plant reproductive strategies and evolutionary pathways.
Area of Science:
- Plant morphology and evolution
- Developmental biology
- Reproductive botany
Background:
- Inflorescence structure is crucial for plant reproductive success.
- Leguminosae (legumes) exhibit diverse inflorescence types, with racemes being common in papilionoids.
- Evolutionary processes have led to varied inflorescence structures within this family.
Purpose of the Study:
- To investigate inflorescence morphology and ontogeny in selected papilionoid legumes.
- To gain new insights into inflorescence reduction mechanisms.
- To propose a novel hypothesis on the evolution of the papilionoid pseudoraceme.
Main Methods:
- Scanning electron microscopy (SEM) was employed.
- Detailed study of inflorescence morphology and ontogeny was conducted.
Main Results:
- Swainsona formosa exhibits an umbel with rare pendulum symmetry.
- Cicer arietinum inflorescences show significant reduction to a single flower.
- Abrus precatorius, Hardenbergia violacea, and Kennedia nigricans display various reduction tendencies and unique developmental patterns.
Conclusions:
- Pendulum symmetry in S. formosa may relate to distichous phyllotaxis.
- The papilionoid pseudoraceme is reinterpreted as a compound raceme with condensed lateral axes.
- Inflorescence evolution can be explained by reduction and synchronization of floral development, advocating for standardized terminology.
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