Diamantina lombardii – an odd Brazilian member of the Podostemaceae

Rutishauser, Rolf; Pfeifer, Evelin; Novelo, R. Alejandro; Philbrick, C. Thomas

doi:10.1016/j.flora.2004.09.004

Cited by 15 publications

(15 citation statements)

References 23 publications

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“…2b) have silica bodies in epidermal and in some hypodermal cells of stem and leaves. In contrast, Rutishauser et al (2005) reported that silica bodies occur in only a few epidermal and hypodermal cells in stem and leaves of D. lombardii; a difference that may have been induced by methodological bias. The silica bodies forming a carapace were present here in sections made with a Ranvier microtome.…”

Section: Resultsmentioning

confidence: 92%

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Silica bodies and their systematic implications at the subfamily level in Podostemaceae

et al. 2011

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Podostemaceae is a family of eudicotyledonous rheophytes with unique morphology, sometimes resembling algae, lichens or bryophytes. This study evaluates the taxonomic value of silica-body morphology (presence, location, size, shape, ornamentation) in species representing the three subfamilies: Tristicha trifaria (Bory ex Willd.) Spreng. (Tristichoideae), Weddellina squamulosa Tul. (Weddellinoideae) and Diamantina lombardii Novelo, C.T.Philbrick & Irgang (Podostemoideae). T. trifaria and D. lombardii have silica bodies in stems and leaves. In contrast, W. squamulosa exhibits silica bodies only in the scale-like leaves. The morphology of these bodies is unique to each species. The results denote the taxonomic usefulness of silica characteristics and a need for a more complete study of silica bodies throughout the family. Key words: aquatic plants, Podostemaceae, silica bodies. ResumoPodostemaceae é uma família eudicotiledônea reófita de morfologia peculiar, lembrando por vezes algas, liquens ou briófitas. O presente estudo avalia o valor taxonômico da morfologia dos corpos silicosos (presença, localização, tamanho, forma e ornamentação) em espécies representantes das três subfamílias: Tristicha trifaria (Bory ex Willd.) Spreng. (Tristichoideae), Weddellina squamulosa Tul. (Weddellinoideae) e Diamantina lombardii Novelo, C.T.Philbrick & Irgang (Podostemoideae). T. trifaria e D. lombardii apresentam corpos silicosos nos caules e nas folhas, enquanto W. squamulosa possui estas estruturas restritas às folhas escamiformes. A diversidade morfológica dos corpos silicosos, específica para cada espécie aqui estudada, comprova o potencial taxonômico deste caráter, até então negligenciado, e aponta para a necessidade de estudos mais abrangentes para essas estruturas em Podostemaceae. Palavras-chave: corpos silicosos, plantas aquáticas, Podostemaceae.

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Section: Resultsmentioning

confidence: 92%

“…Although the presence of silica bodies in Podostemaceae has been noted by numerous authors in many genera, such as Apinagia, Diamantina, Podostemum and Weddellina (e.g. Schnell 1967, Rutishauser et al 2005, Koi & Kato 2007, morphological descriptions and comparative studies involving taxonomic or phylogenetic perspectives are lacking.…”

Section: Introductionmentioning

confidence: 99%

Silica bodies and their systematic implications at the subfamily level in Podostemaceae

et al. 2011

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“…Jäger-Zürn (2005) proposed that the spathella is two fused bracts (hypsophylls) in Apinagia and Marathurum, members of American Podostemoideae. Rutishauser et al (2005) considered that the spathella is homologous to one or two fused bract(s) in Diamantina lombardii Novelo, Philbrick and Irang. Our results show that, in H. japonicum, the spathella, like the tepal, stamen and carpel, arises exogeneously on the floral meristem.…”

Section: Discussionmentioning

confidence: 99%

Developmental anatomy of the reproductive shoot in Hydrobryum japonicum (Podostemaceae)

2008

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Podostemaceae are unusual aquatic angiosperms adapting to extreme habitats, i.e., rapids and waterfalls, and have unique morphologies. We investigated the developmental anatomy of reproductive shoots scattered on crustose roots of Hydrobryum japonicum by scanning electron microscopy and using semi-thin serial sections. Two developmental patterns were observed: bracts arise either continuously from an area of meristematic cells that has produced leaves, or within differentiated root ground tissue beneath, and internal to, leaf base scars after an interruption. In both patterns, the bract primordia arise endogenously at the base of youngest bracts in the absence of shoot apical meristem, involving vacuolated-cell detachment to each bract separately. The different transition patterns of reproductive shoot development may be caused by different stages of parental vegetative shoots. The floral meristem arises between the two youngest bracts, and is similarly accompanied by cell degeneration. In contrast, the floral organs, including the spathella, arise exogenously from the meristem. Bract development, like vegetative leaf development, is unique to this podostemad, while floral-organ development is conserved.

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“…There is no special envelope in Tristichoideae (all genera) and Weddellinoideae, but Podostemoideae (all genera) have spathellas enclosing flower buds (Rutishauser, 1997;Rutishauser et al, 2005;Cook and Rutishauser, 2007). A gene-expression analysis supports that the spathella is a floral organ (Katayama et al, 2010).…”

Section: Appendix Notes On Character Statesmentioning

confidence: 99%