Abstract
BACKGROUND AND AIMS: Parkia platycephala, a native Cerrado species, belongs to the tribe Mimoseae (Fabaceae) and is distinguished by its unique capitulum, which comprises two floral morphotypes: seed-producing flowers and nectariferous flowers. The functional roles of these morphotypes remain unclear, prompting us to investigated inflorescence and floral development to explore their evolutionary and ecological significance. METHODS: Flowers, inflorescences, and floral buds at various developmental stages were collected and processed for surface analysis (scanning electron microscopy) and anatomical analysis (light microscopy). KEY RESULTS: We observed the initiation of three floral unit meristems (FUMs), with abortion of the basal FUM likely due to spatial restriction. Floral buds exhibit a subtle developmental gradient, with seed flowers located in the basal and median regions and nectariferous flowers restricted to the apical region of the capitulum. Both morphotypes display an elliptical floral meristem. Sepals arise in a sequential order; petals, simultaneously; antesepalous and antepetalous stamens emerge unidirectionally; and the single carpel develops concurrently with the lateral antesepalous stamens. The stamens are basally fused and adnate to the petals, forming the stemonozone. Polyads in seed-producing flowers contain cytoplasmic content, unlike most polyads in nectariferous morphotype. CONCLUSIONS: The spatial arrangement of floral morphotypes within the inflorescence defines its zonation, with each capitulum functioning as a pollination unit. The congested arrangement of floral buds and pressure exerted by bracts may contribute to developmental peculiarities, including fasciation and merism variation. We hypothesize that the seed-producing flowers function primarily in fertilisation, whereas nectariferous flowers the only morphotypes containing an intrastaminal nectary serve as food reward for pollinator. Additionally, the type of initiation of sepals, reported exclusively in Parkia, underscores its unique floral developmental pattern. Our anatomical and developmental analyses elucidate the reproductive structures of P. platycephala and clarify the functional significance of its floral dimorphism.
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Claims 17
Claim · model-written summary
Three floral unit meristems were initiated in the Parkia platycephala capitulum.
- Taxon
- Parkia platycephala
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Parkia platycephalae0 - Outcome
- initiation of three floral unit meristemse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e1“We observed the initiation of three floral unit meristems”
Claim · model-written summary
Abortion of the basal floral unit meristem is likely due to spatial restriction.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Outcome
- abortion of the basal FUMe2
- Qualifier
- spatial restrictione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e2“abortion of the basal FUM likely due to spatial restriction”
Claim · model-written summary
Seed-producing flowers are located in the basal and median regions of the capitulum.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Organ / stage
- capitulume3
- Outcome
- seed flowers located in the basal and median regionse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e3“seed flowers located in the basal and median regions and nectariferous flowers restricted to the apical region of the capitulum”
Claim · model-written summary
Nectariferous flowers are restricted to the apical region of the capitulum.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Organ / stage
- capitulume3
- Outcome
- nectariferous flowers restricted to the apical regione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e3“seed flowers located in the basal and median regions and nectariferous flowers restricted to the apical region of the capitulum”
Claim · model-written summary
Both floral morphotypes display an elliptical floral meristem.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Organ / stage
- floral meristeme4
- Outcome
- elliptical floral meristeme4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e4“Both morphotypes display an elliptical floral meristem”
Claim · model-written summary
Sepals arise in a sequential order in Parkia platycephala flowers.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Outcome
- Sepals arise in a sequential ordere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e5“Sepals arise in a sequential order; petals, simultaneously; antesepalous and antepetalous stamens emerge unidirectionally; and the single carpel develops concurrently with the lateral antesepalous stamens”
Claim · model-written summary
Petals arise simultaneously in Parkia platycephala flowers.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Outcome
- petalse5
- Qualifier
- simultaneouslye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e5“Sepals arise in a sequential order; petals, simultaneously; antesepalous and antepetalous stamens emerge unidirectionally; and the single carpel develops concurrently with the lateral antesepalous stamens”
Claim · model-written summary
Antesepalous and antepetalous stamens emerge unidirectionally.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Outcome
- antesepalous and antepetalous stamense5
- Qualifier
- emerge unidirectionallye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e5“Sepals arise in a sequential order; petals, simultaneously; antesepalous and antepetalous stamens emerge unidirectionally; and the single carpel develops concurrently with the lateral antesepalous stamens”
Claim · model-written summary
The single carpel develops concurrently with the lateral antesepalous stamens.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Outcome
- single carpele5
- Qualifier
- develops concurrently with the lateral antesepalous stamense5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e5“Sepals arise in a sequential order; petals, simultaneously; antesepalous and antepetalous stamens emerge unidirectionally; and the single carpel develops concurrently with the lateral antesepalous stamens”
Claim · model-written summary
Stamens are basally fused and adnate to the petals, forming the stemonozone.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Organ / stage
- stemonozonee6
- Outcome
- basally fused and adnate to the petalse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e6“The stamens are basally fused and adnate to the petals, forming the stemonozone”
Claim · model-written summary
Polyads in seed-producing flowers contain cytoplasmic content, unlike most polyads in nectariferous flowers.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Organ / stage
- seed-producing flowerse7
- Outcome
- cytoplasmic contente7
- Comparator
- most polyads in nectariferous morphotypee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e7“Polyads in seed-producing flowers contain cytoplasmic content, unlike most polyads in nectariferous morphotype”
Claim · model-written summary
Seed-producing flowers function primarily in fertilisation.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Organ / stage
- seed-producing flowerse1
- Outcome
- function primarily in fertilisatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e1“We hypothesize that the seed-producing flowers function primarily in fertilisation”
Claim · model-written summary
Nectariferous flowers serve as food reward for pollinators.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Organ / stage
- nectariferous flowerse2
- Interactor
- pollinatore2pollinator
- Outcome
- food rewarde2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e2“nectariferous flowers the only morphotypes containing an intrastaminal nectary serve as food reward for pollinator”
Claim · model-written summary
Only the nectariferous flowers contain an intrastaminal nectary.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Organ / stage
- nectariferous flowerse2
- Outcome
- intrastaminal nectarye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e2“nectariferous flowers the only morphotypes containing an intrastaminal nectary serve as food reward for pollinator”
Claim · model-written summary
The type of sepal initiation in Parkia platycephala is reported exclusively in Parkia.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Outcome
- type of initiation of sepalse3
- Qualifier
- reported exclusively in Parkiae3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e3“the type of initiation of sepals, reported exclusively in Parkia”
Claim · model-written summary
Congested floral buds and bract pressure may contribute to fasciation and merism variation.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Outcome
- fasciation and merism variatione4
- Qualifier
- congested arrangement of floral buds and pressure exerted by bractse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e4“The congested arrangement of floral buds and pressure exerted by bracts may contribute to developmental peculiarities, including fasciation and merism variation”
Claim · model-written summary
The spatial arrangement of floral morphotypes defines the zonation of the capitulum, with each capitulum acting as a pollination unit.
- Taxon
- Parkia platycephalaParkia platycephalae0
- Outcome
- zonatione5
- Qualifier
- each capitulum functioning as a pollination unite5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parkia platycephala, a native Cerrado species”
e5“The spatial arrangement of floral morphotypes within the inflorescence defines its zonation, with each capitulum functioning as a pollination unit”