Pollen structure and development in Nymphaeales: Insights into character evolution in an ancient angiosperm lineage

Taylor, Mackenzie L.; Cooper, Ranessa L.; Schneider, Edward L.; Osborn, Jeffrey M.

doi:10.3732/ajb.1500249

Cited by 29 publications

(18 citation statements)

References 110 publications

(235 reference statements)

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“…() and the characters identified by Taylor et al . () and Coiro & Barone Lumaga (), our characters increase support for the grouping of Victoria and Euryale, the monophyly of Nymphaea and the grouping of the tropical Nymphaea (subgenera Lotos, Anecphya and Brachyceras ) using both MP and BI (Fig. S1).…”

Section: Discussionsupporting

confidence: 76%

“…() and Taylor et al . () result in the most MP trees. These trees differ in the relationships between the Nymphaea species, Victoria and Euryale , and result in an unresolved consensus.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the differences between Matrices 2, 3 and 4 show that the anatomy of the floral organs is less labile compared to pollen characters (Taylor et al . ).…”

Section: Discussionmentioning

confidence: 97%

“…(), Taylor et al . () and Coiro & Barone Lumaga (); the combinations are explained in Table S2. We predict that if the anatomy of the flower reflects pollination ecology, the amount of tree‐like signal in the combined datasets should decrease, and the support for ecological groupings ( i.e.…”

Section: Methodsmentioning

confidence: 99%

“…Victoria plus the night-blooming Nymphaea) should increase. We included the pollen data, which present a high degree of homoplasy (Taylor et al 2015), as a 'positive control' of this first prediction. On the other hand, an increase in tree-likeness and a stronger support for clades supported by molecular analyses would indicate a congruence between anatomical traits and historical signal.…”

Section: Signal Dissection and Morphological Congruencementioning

confidence: 99%

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Disentangling historical signal and pollinator selection on the micromorphology of flowers: an example from the floral epidermis of the Nymphaeaceae

Coiro

Lumaga

2018

Plant Biol J

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The family Nymphaeaceae includes most of the diversity among the ANA-grade angiosperms. Among the species of this family, floral structures and pollination strategies vary. The genus Victoria, as well as subgenera Lotos and Hydrocallis in Nymphaea, present night-blooming, scented flowers pollinated by scarab beetles. Such similar pollination strategies have led to macromorphological similarities among the flowers of these species, which could be interpreted as homologies or convergences based on different phylogenetic hypotheses about the relationships of these groups. We employed scanning electron microscopy of floral epidermis for seven species of the Nymphaeaceae with contrasting pollination biology to identify the main characters of the floral organs and the potential homologous nature of the structures involved in pollinator attraction. Moreover, we used transmission electron microscopy to observe ultrastructure of papillate-conical epidermis in the stamen of Victoria cruziana. We then tested the phylogenetic or ecological distribution of these traits using both consensus network approaches and ancestral state reconstruction on fixed phylogenies. Our results show that the night-blooming flowers present different specialisations in their epidermis, with V. cruziana presenting the most elaborate floral anatomy. We also identify for the first time the presence of conical-papillate cells in the order Nymphaeales. The epidermal characters tend to reflect phylogenetic relationships more than convergence due to pollinator selection. These results point to an independent and parallel evolution of scarab pollination in Nymphaeaceae and demonstrate the promise of floral anatomy as a phylogenetic marker. Moreover, they indicate a degree of sophistication in the anatomical basis of cantharophilous flowers in the Nymphaeales that diverges from the most simplistic views of floral evolution in the angiosperms.

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Section: Discussionsupporting

confidence: 76%

“…() and Taylor et al . () result in the most MP trees. These trees differ in the relationships between the Nymphaea species, Victoria and Euryale , and result in an unresolved consensus.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the differences between Matrices 2, 3 and 4 show that the anatomy of the floral organs is less labile compared to pollen characters (Taylor et al . ).…”

Section: Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Signal Dissection and Morphological Congruencementioning

confidence: 99%

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Disentangling historical signal and pollinator selection on the micromorphology of flowers: an example from the floral epidermis of the Nymphaeaceae

Coiro

Lumaga

2018

Plant Biol J

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Self-assembly as the underlying mechanism for exine development in Larix decidua D. C.

Gabarayeva

Grigorjeva

2017

Planta

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Our findings suggest a new approach to pollen ontogenetic investigations, entailing consideration of physical factors, which enable a better understanding of exine developmental processes. The sporopollenin-containing part of the pollen wall-the exine-is one of the most complex cell walls in plants. By tracing each stage of microspore development in Larix decidua with TEM, we aimed to understand the underlying mechanisms of its exine establishment. Our hypothesis is that self-assembly interferes with exine development. Our specific aim is to generate experimental simulations of the exine developmental pattern. The sequence of events leading to exine development includes the appearance of spherical units in the periplasmic space, their rearrangement into radial columns, and the appearance of white-lined endexine lamellae. The final accumulation of sporopollenin proceeds in the post-tetrad period. The sequence of self-assembling micellar mesophases corresponds with that of the developmental events: spherical micelles; columns of spherical micelles; and laminate micelles separated by strata of water and visible as white-lined lamellae in TEM. Several patterns, simulating structures at different stages of exine development in Larix, were obtained from in vitro experiments. Purely physicochemical processes of self-assembly, which are not under direct genetic control, play an important role in exine development and share control with the genome. These findings suggest that a new approach to ontogenetic investigations, entailing consideration of physical factors (e.g., cell tensegrity), is required for a better understanding of developmental processes.

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Simulation of exine patterns by self-assembly

Gabarayeva

Grigorjeva

2016

Plant Syst Evol

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Pollen structure and development in Nymphaeales: Insights into character evolution in an ancient angiosperm lineage

Cited by 29 publications

References 110 publications

Disentangling historical signal and pollinator selection on the micromorphology of flowers: an example from the floral epidermis of the Nymphaeaceae

Disentangling historical signal and pollinator selection on the micromorphology of flowers: an example from the floral epidermis of the Nymphaeaceae

Self-assembly as the underlying mechanism for exine development in Larix decidua D. C.

Simulation of exine patterns by self-assembly

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