Podostemaceae Depend on Sticky Biofilms with Respect to Attachment to Rocks in Waterfalls

Jäger-Zürn, Irmgard; Grubert, M. W.

doi:10.1086/314292

Cited by 41 publications

(28 citation statements)

References 7 publications

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“…It has been interpreted as a creeping root/root thallus/flattened root/root crust/transformed root (Tulasne 1852;Willis 1902a;Philbrick 1984;Jäger-Zü rn 1997Rutishauser 1997;Imaichi et al 1999;Rutishauser et al 1999; Jä ger-Zü rn and Grubert 2000;Ota et al 2001), a shoot thallus/stoloniferous stem/prostrate stem/prostrate axis/shoot crust/creeping stem (Warming 1882(Warming , 1891Novelo and Philbrick 1993;Rutishauser and Grubert 1994;Philbrick and Novelo 1 E-mail asehgal@del6.vsnl.net.in. Manuscript received November 2001;revised manuscript received April 2002revised manuscript received April .…”

Section: Introductionmentioning

confidence: 99%

“…Manuscript received November 2001;revised manuscript received April 2002revised manuscript received April . 1995Jä ger-Zü rn 1997;Rutishauser 1997;Tur 1997; Jä ger-Zü rn and Grubert 2000), or a combined shoot (leaf and stem) structure (Willis 1902b). We have used the neutral and descriptive term "thallus" without implying homology to liverworts (Vidyashankari and Mohan Ram 1987;Vidyashankari 1988aVidyashankari , 1988b; Mohan Sehgal 1992, 1997;Khosla and Mohan Ram 1993;Sehgal et al 1993;Khosla 1996;Uniyal and Mohan Ram 1996;Khosla et al 2000).…”

Section: Introductionmentioning

confidence: 99%

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Origin, Structure, and Interpretation of the Thallus inHydrobryopsis sessilis(Podostemaceae)

Sehgal¹,

Sethi²,

Ram³

2002

International Journal of Plant Sciences

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Origin, Structure, and Interpretation of the Thallus inHydrobryopsis sessilis(Podostemaceae)

Sehgal¹,

Sethi²,

Ram³

2002

International Journal of Plant Sciences

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“…An example of using biofilm for attachment can be found in plants that inhabit waterfalls. Different Podosteamaceae species develop adhesive hairs that stick to cyanobacteria threads and biofilm matrix (Jäger-Zürn and Grubert, 2000). In their habitats, these plants withstand enormous tensile stress caused by the action of running water.…”

Section: Surface Roughness and Frictionmentioning

confidence: 99%

Underwater attachment in current: the role of setose attachment structures on the gills of the mayfly larvaeEpeorus assimilis(Ephemeroptera, Heptageniidae)

Ditsche-Kuru

Koop

Gorb

2010

Journal of Experimental Biology

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SUMMARYSetose pads of aquatic Epeorus assimilis larvae are specialised structures located ventrally on the part of the gill lamella contacting the substrate and were suggested to have an attachment function in strong currents. In order to test the role of these setose pads in underwater attachment for the first time, we measured friction (shear) forces generated by the gill lamellae on solid substrates. Moreover, the influence of a different kind of surface roughness on attachment was investigated. Scanning electron microscopy showed that four different seta types can be found on the pads. Our results revealed that the pads significantly contributed to friction force generated on smooth and on some rough substrates but not on certain surfaces of intermediate roughness. The contribution of pads to the friction coefficient in experiments was lower than expected under natural conditions, which may be caused by a smaller contact area between the pads and the substrate (changes in material properties, lack of the active control of body positioning of the larva). The friction coefficient of the gill lamellae with the substrate depended on the surface roughness of the substrate and on the pulling direction. These results suggest that interlocking between structures of the insect cuticle and substrate irregularities, as well as molecular adhesion, contribute to friction.

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“…Estas hierbas crecen sumergidas en ríos con corrientes rápidas y en cascadas, donde permanecen adheridas firmemente a substratos rocosos (Graham y Wood, 1975;Philbrick, 1984) por la acción de los pelos unicelulares que se desarrollan en la parte ventral del tallo taloide (Rutishauser, 1997), cuyas paredes celulares, ricas en substancias pécticas, interactúan con una capa de cianobacterias limosas que, como "biopelícula" con propiedades viscoelásticas, constituye una potente goma adhesiva (Jäger-Zürn, 2000).…”

Section: Introductionunclassified

Desarrollo de los verticilos sexuales de Vanroyenella plumosa Novelo & Philbrick (Podostemaceae)

et al. 2001

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RESUMENEl cuerpo vegetativo de Vanroyenella plumosa Novelo & Philbrick (subfamilia Podostemoideae) posee raíz, hojas y un tallo taloide dorsiventralmente aplanado que, durante la etapa reproductora, desarrolla cavidades ocupadas por fascículos florales. En este trabajo se estudió la embriología de esta especie y se relacionó el desarrollo floral con la posición de las flores en el cuerpo vegetativo de la planta, la posición de la planta sobre la roca y de la planta con el nivel del agua. Vanroyenella plumosa presenta dos estambres cuyas anteras son tetrasporangiadas, con un desarrollo de la pared de tipo Básico, tétradas tetraédricas y polen bicelular. El gineceo es bicarpelar y bilocular con placentación axial y presenta dos estigmas con idioblastos cuya vacuola contiene proteínas y carbohidratos. Los óvulos son anátropos, bitégmicos y tenuinucelados. El saco embrionario es monospórico y tetracelular, del tipo Apinagia. En Vanroyenella el desarrollo floral ocurre en el interior del tallo mientras la planta está sumergida, allí se forman los gametos en etapas muy tempranas. Cuando el nivel del agua baja, los pedicelos se alargan y sobreviene la antesis, en el ambiente aéreo. Acta Botanica Mexicana (2001), 57: 37-50 38 La pared del ovario sostiene el desarrollo de las semillas una vez que el resto del tejido vegetativo ha muerto.Palabras clave: androceo, gineceo, plasmodio nucelar, saco embrionario, Vanroyenella, Podostemaceae, México. ABSTRACTThe vegetative body of Vanroyenella plumosa Novelo & Philbrick (subfamily Podostemoideae) is composed of roots, leaves and a dorsiventrally flattened thalloid stem which, in the reproductive stage of the life cycle, develops cavities containing fascicles of flowers. In this work the embryology of this species was studied. Floral development depends on the flower position in the vegetative body of the plant, the plant position on the rock and the water level in the river. Vanroyenella plumosa possesses two stamens with tetrasporangiate anthers; the anther wall formation is of the basic type. Tetrads are tetrahedral, and the pollen is bicellular. The gynoecium is bicarpelar and bilocular with axial placentation and has two stigmas with idioblasts whose vacuoles contain proteins and carbohydrates. The ovules are anatropous, bitegmic and tenuinucellate. The embryo sac is monosporic in its origin and tetracellular of the Apinagia type. In Vanroyenella floral development occurs in the interior of the stem while the plant is submerged, and it is during this very early stage that the male and female gametes are formed. When the water level recedes, the pedicels elongate and anthesis occurs above water. The ovary wall supports the seed development after the rest of the vegetative tissue has died.

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Podostemaceae Depend on Sticky Biofilms with Respect to Attachment to Rocks in Waterfalls

Cited by 41 publications

References 7 publications

Origin, Structure, and Interpretation of the Thallus inHydrobryopsis sessilis(Podostemaceae)

Origin, Structure, and Interpretation of the Thallus inHydrobryopsis sessilis(Podostemaceae)

Underwater attachment in current: the role of setose attachment structures on the gills of the mayfly larvaeEpeorus assimilis(Ephemeroptera, Heptageniidae)

Desarrollo de los verticilos sexuales de Vanroyenella plumosa Novelo & Philbrick (Podostemaceae)

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