Flowers of the early‐branching papilionoid legume <i>Petaladenium urceoliferum</i> display unique morphological and ontogenetic features

Prenner, Gerhard; Cardoso, Domingos; Zartman, Charles E.; Queiroz, Luciano Paganucci de

doi:10.3732/ajb.1500348

Cited by 17 publications

(14 citation statements)

References 29 publications

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“…Secretory ducts/cavities in the anther and even in other floral organs have not been reported in closely related Dipterygeae groups (see Tucker , Leite et al , Prenner et al ). Secretory cavities have only been found in the leaves of some species of Myrocarpus , Myroxylon and Myrospermum (Sartori & Tozzi ), genera of the Amburaneae clade, a sister group to the Dipterygeae clade (Cardoso et al , , ; LPWG [Legume Phylogeny Working Group] ).…”

Section: Introductionmentioning

confidence: 99%

Presence of the anther gland is a key feature in pollination of the early‐branching papilionoidsDipteryx alataandPterodon pubescens(Leguminosae)

et al. 2019

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The presence of glandular appendages in the anthers is a rare condition in angiosperms. In Leguminosae it occurs in species of the Mimosoid clade and in earlybranching clades of papilionoids such as Dipterygeae. In Dipterygeae such appendages surprisingly exhibit a secretory cavity instead of secretory emergences as is the case for the Mimosoid clade. Thus, the objective of this study was to elucidate the function of anther glands in Dipteryx alata and Pterodon pubescens, species in the Dipterygeae clade that exhibit a pollen release mechanism that is intermediate between the explosive and valvular types.• Flower buds and flowers were processed for surface, anatomical, histochemical and ultrastructural analyses.• Anther glands consist of a cavity secreting sticky substances (oleoresins and polysaccharides) that play a key role during the flower's lifespan by aggregating pollen grains and attaching them to the floral visitor's body. Other floral features that are important for understanding the pollen release mechanism that is intermediate between the valvular and the explosive types are: (i) keel petals intertwined with tector trichomes; (ii) glandular appendages in the abaxial and lateral sepals and in petals composed of secretory ducts; and (iii) a continuous secretion process of the anther glands followed by an asynchronous dehiscence of anthers.• The well-adapted papilionoid flag blossom with anther glands and keel petals intertwined with trichomes provided the foundation for a successful canalisation toward a pollen release mechanism intermediate between the explosive and valvular types inside early-branching papilionoids.

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Section: Introductionmentioning

confidence: 99%

Presence of the anther gland is a key feature in pollination of the early‐branching papilionoidsDipteryx alataandPterodon pubescens(Leguminosae)

et al. 2019

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“…Por otra parte, se han observado tricomas en las piezas florales de varias especies de la familia Leguminosae y aunque su presencia es una condición amplia, su distribución, abundancia, función y morfología son altamente variables y tienen un valor sistemático potencial para algunos grupos (Rico-Arce 1991, Tucker 2000, Prenner & Klitgaard 2008, Prenner et al 2015. Dentro del clado Mimosoideae varias especies presentan escasa cantidad de tricomas unicelulares o en forma de papilas simples en los ápices de los pétalos, como en la especie aquí estudiada, carácter que comparte con Acacia pennatula (Schltdl.…”

Section: Discussionunclassified

“…Asimismo, los registros de estomas en órganos florales de leguminosas han sido escasos, Prenner & Klitgaard (2008) observan estas estructuras en la superficie abaxial de los pétalos en Duparquetia orchidacea Baill., aunque no les asignan ninguna función, en tanto que Prenner et al (2015) los estudiaron en la parte inferior del hipanto de Petaladenium urceoliferum Ducke y los relacionaron con la secreción de néctar. Acaciella angustissima presenta estomas en la cara adaxial de los pétalos de la corola y podrían corresponder con la emisión de fragancias, como lo sugerido para Acacia berlandieri (Gómez-Acevedo et al 2007), aunque se requiere de estudios anatómicos y pruebas histoquímicas para su corroboración.…”

Section: Discussionunclassified

“…Gineceo. Una de las características conspicuas de la familia, es la presencia de un único carpelo superior, cuyo surgimiento es precoz, previo a la formación del androceo (Tucker 2003, Prenner & Klitgaard 2008, Naghiloo et al 2012, Prenner et al 2015. Las tres especies aquí comparadas Acaciella angustissima, Acacia berlandieri (Gómez-Acevedo et al 2007) y C. angustifolia (Prenner 2004) cumplen con esta condición.…”

Section: Discussionunclassified

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Desarrollo floral de Acaciella angustissima (Leguminosae: Caesalpinioideae: Acacieae)

Rico-Alvarado

Gómez-Acevedo

2022

Bot. Sci.

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Antecedentes: Acaciella (Mill.) Britton & Rose es un género neotropical, cuyas especies se encontraban dentro del subgénero Aculeiferum (tribu Acacieae) debido a similitudes morfológicas. Estudios moleculares reflejan relaciones filogenéticas cercanas con el género Calliandra (tribu Ingeae). Actualmente se carece de estudios del desarrollo floral para Acaciella, lo cual podría proveer de evidencias morfológicas relacionadas con la historia evolutiva de ambas tribus. Preguntas: ¿Los patrones de desarrollo floral de Acaciella angustissima serán similares a lo reportado para especies de las tribus Acacieae e Ingeae? Especie de estudio: Acaciella angustissima (Mill.) Britton & Rose Sitio de estudio: Pie de Vaca, Tepexi de Rodríguez, Puebla, México, mayo de 2014. Métodos: Botones florales e inflorescencias maduras fueron colectadas y disectadas para su observación con el microscopio electrónico de barrido. Resultados: Especie andromonoica con flores agrupadas en cabezuelas. La maduración de las inflorescencias es acrópeta y ligeramente asincrónica. Las flores son actinomorfas y presentan un nectario floral en la base de los filamentos. El patrón de surgimiento de los primordios es simultáneo en el perianto y en el androceo. El surgimiento del carpelo es precoz, previo a la aparición de los primordios de estambres, aún en las flores masculinas. Conclusiones: A. angustissima presenta características ontogenéticas particulares, como la maduración asincrónica de los meristemos florales en la inflorescencia y el surgimiento simultáneo del androceo. Comparte con la tribu Ingeae el surgimiento acrópeto de los meristemos florales en la inflorescencia y con Acacieae e Ingeae la inserción simultánea de la corola y la aparición precoz del carpelo.

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“…remarkable new insights into the evolution of extrafloral nectaries (Marazzi et al, 2012), the polycarpellate gynoecium (Paulino et al, 2014) and the high persistence of legume-rhizobia symbiosis (Werner et al, 2015). The wealth of floral ontogenetic data available for legumes (Tucker, 1987(Tucker, , 1988a(Tucker, , b, 2003cPrenner, 2004a, b;Marazzi and Endress, 2008), including recent results for phylogenetically enigmatic lineages that branch off at deep nodes (Prenner and Klitgaard, 2008;Prenner et al, 2015), are likewise extremely useful for large-scale comparison and as sources for potential synapomorphic characters of still obscure relationships. The caesalpinioid Detarieae lineage is an example of such a highly morphologically heterogeneous collection of genera marked by an exceptional lability in floral evolution (Bruneau et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Flower development ofGoniorrhachis marginatareveals new insights into the evolution of the florally diverse detarioid legumes

Prenner

Cardoso

2016

Ann Bot

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Background and Aims The study of floral morphology and ontogeny and the re-investigation of existing data help to uncover potential synapomorphic characters and foster our understanding of phylogenetic relationships that rely primarily on molecular analyses. Goniorrhachis marginata is a monotypic caesalpinioid legume (Leguminosae) that shows some interesting floral features, such as a long hypanthium and regular Rosaceae-like flowers. We studied the ontogeny and morphology of the flowers in detail and present our results in a broad phylogenetic context.Methods Flower buds were collected in the field, fixed in 70 % ethanol and investigated using scanning electron microscopy. Older buds in spirit were carefully opened to investigate the direction of style bending. Characters of the style from 131 taxa from the main legume lineages were analysed and mapped on a Bayesian molecular phylogeny.Key Results The tetramerous calyx is the result of complete loss of one sepal. The formation of the radially symmetrical corolla starts in a typical caesalpinioid pattern with the adaxial petal innermost (ascending aestivation). The young style bends in the abaxial direction, which is a character found exclusively in all studied detarioid legumes and therefore a newly described synapomorphy for the clade.Conclusions We show that investigation of unstudied taxa and reinvestigation of published data can uncover new, previously overlooked and important characters. Curvature of the style can be detected in young buds with a hand lens and therefore is an important character for field botanists. Our study reveals the importance of including poorly studied and/or phylogenetically enigmatic taxa in molecular phylogenies and in detailed morphological and ontogenetic analyses.

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Flowers of the early‐branching papilionoid legume Petaladenium urceoliferum display unique morphological and ontogenetic features

Cited by 17 publications

References 29 publications

Presence of the anther gland is a key feature in pollination of the early‐branching papilionoidsDipteryx alataandPterodon pubescens(Leguminosae)

Presence of the anther gland is a key feature in pollination of the early‐branching papilionoidsDipteryx alataandPterodon pubescens(Leguminosae)

Desarrollo floral de Acaciella angustissima (Leguminosae: Caesalpinioideae: Acacieae)

Flower development ofGoniorrhachis marginatareveals new insights into the evolution of the florally diverse detarioid legumes

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