Plants are used to having identity crises

Rutishauser, Rolf; Grob, Valentin; Pfeifer, Evelin

doi:10.1017/cbo9780511541582.015

Cited by 19 publications

(28 citation statements)

References 63 publications

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“…Both hypotheses may be seen as complementary, when we accept in eudicots a conceptual continuum from leaves (as major category of photosynthetic stem appendages) to stipules (as a somewhat subaltern category of stem appendages). The two hypotheses may even fuse into one when we accept stipule-leaf indistinction, i.e., fuzziness in the distinction of ("true") leaves and stipules in Leguminosae, as already proposed by Rutishauser et al [15].…”

Section: Sam (Hypothesis 2)mentioning

confidence: 74%

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Acacia (wattle) and Cananga (ylang-ylang): from spiral to whorled and irregular (chaotic) phyllotactic patterns – a pictorial report

Rutishauser

2016

Acta Soc Bot Pol

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Phyllotaxis, i.e., the arrangement of leaves around the stem and leaf-like organs inside flowers is regular in most vascular plants. Thus, developmental models usually explain regular phyllotactic patterns such as Fibonacci spirals and decussate/ whorled patterns that obey Hofmeister's rule: primordia form as far away as possible from previously initiated primordia. However, flowering plants showing at first Fibonacci spirals or whorled phyllotaxes may switch to other patterns that lack an obvious order and thus may be called irregular or even chaotic. Vegetative shoot tips of various Australian wattles (Acacia spp., Leguminosae in eudicots) and flower buds of ylang-ylang (Cananga odorata) and other Annonaceae (basal angiosperms) provide examples of irregular patterning. This pictorial report provides food for thought for scientists interested in phyllotaxis patterns beyond the usual spiral and whorled patterns. Emphasis is given on irregular phyllotaxes that occur in wild-type plants, mainly correlated with geometrical parameters such as leaf and stamen primordia that are very small as compared to the size of their apical meristems. They call for additional explanatory models, combining auxin-driven development with geometrical constraints and biophysical processes.

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Section: Sam (Hypothesis 2)mentioning

confidence: 74%

“…If readers are interested in fuzziness of structural categories, continuum approaches, and complementary perspectives to describe plant architecture they are referred to earlier publications of the Sattler school [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Acacia (wattle) and Cananga (ylang-ylang): from spiral to whorled and irregular (chaotic) phyllotactic patterns – a pictorial report

Rutishauser

2016

Acta Soc Bot Pol

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“…Classen‐Bockhoff (1992) discussed the developmental similarity between flowers and inflorescences as a simple shift from one organizational level to another. Rutishauser et al (2008) described “fuzzy” boundaries in several plant structures that cannot readily be categorized into discrete hierarchical units. Sokoloff et al (2006) compared the occurrence of terminal pseudanthia and associated anomalous structures in racemose inflorescences of early‐divergent angiosperms.…”

Section: Discussionmentioning

confidence: 99%

Nonflowers near the base of extant angiosperms? Spatiotemporal arrangement of organs in reproductive units of Hydatellaceae and its bearing on the origin of the flower

Rudall

Remizowa

Prenner

et al. 2009

American J of Botany

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Reproductive units (RUs) of Trithuria, the sole genus of the early-divergent angiosperm family Hydatellaceae, are compared with flowers of their close relatives in Cabombaceae (Nymphaeales). Trithuria RUs combine features of flowers and inflorescences. They differ from typical flowers in possessing an "inside-out" morphology, with carpels surrounding stamens; furthermore, carpels develop centrifugally, in contrast to centripetal or simultaneous development in typical flowers. Trithuria RUs could be interpreted as pseudanthia of two or more cymose partial inflorescences enclosed within an involucre, but the bractlike involucral phyllomes do not subtend partial inflorescences and hence collectively resemble a typical perianth. Teratological forms of T. submersa indicate a tendency to fasciation and demonstrate that the inside-out structure-the primary feature that separates RUs of Hydatellaceae from more orthodox angiosperm flowers-can be at least partially modified, thus producing a morphology that is closer to an orthodox flower. The Trithuria RU could be described as a "nonflower", i.e., a structure that contains typical angiosperm carpels and stamens but does not allow recognition of a typical angiosperm flower. The term nonflower could combine cases of secondary loss of flower identity and cases of a prefloral condition, similar to those that gave rise to the angiosperm flower. Nonhomology among some angiosperm flowers could be due to iterative shifts between nonfloral construction and flower/inflorescence organization of reproductive organs. Potential testing of these hypotheses using evolutionary-developmental genetics is explored using preliminary data from immunolocalization of the floral meristem identity gene LEAFY in T. submersa, which indicated protein expression at different hierarchical levels.

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“…Muitos aspectos demonstram que é uma família completamente atípica dentre as Angiospermas, como a ausência da dupla fertilização e de endosperma (Haig 1990) e a distinção muitas vezes obscura entre raiz/caule/folha (Willis 1902, Rutishauser et al 2008. Sua biologia e características morfológicas são bem incomuns até mesmo dentre as plantas aquáticas, como por exemplo, o habitat singular que ocupa (sua preferência aos ambientes lóticos em vez dos lênticos é compartilhada apenas pela fi logeneticamente distante asterídea, Hydrostachyaceae); a forma de adesão ao substrato (rochas nuas), feita através de estruturas especiais (haptera) e por meio de interações com cianobactérias (Jäger-Zürn & Grubert 2000); a ausência de aerênquima (Rutishauser 1997); o predomínio da reprodução sexuada sobre a assexuada (Philbrick & Les 1996); a alta taxa de endemismos (Philbrick et al 2010) e o elevado número de táxons.…”

Section: Introductionunclassified

Check-List Da Família Podostemaceae Do Estado Do Mato Grosso Do Sul, Brasil

Bove¹

2018

Iheringia Ser Bot

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RESUMO-Neste trabalho são apresentados dois gêneros e três espécies da família Podostemaceae encontradas no estado do Mato Grosso do Sul e depositados em coleções científi cas do país e do exterior. Uma análise histórica, fi logenética e geográfi ca detalhada é apresentada, assim como o panorama das coleções e instituições de pesquisas no que concerne à família. Perspectivas para o avanço do conhecimento do grupo para os próximos 10 anos são traçadas.

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Plants are used to having identity crises

Cited by 19 publications

References 63 publications

Acacia (wattle) and Cananga (ylang-ylang): from spiral to whorled and irregular (chaotic) phyllotactic patterns – a pictorial report

Acacia (wattle) and Cananga (ylang-ylang): from spiral to whorled and irregular (chaotic) phyllotactic patterns – a pictorial report

Nonflowers near the base of extant angiosperms? Spatiotemporal arrangement of organs in reproductive units of Hydatellaceae and its bearing on the origin of the flower

Check-List Da Família Podostemaceae Do Estado Do Mato Grosso Do Sul, Brasil

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