Developmental Physiology

Bopp, Martin; Fellenberg, Günter

doi:10.1007/978-3-642-66803-6_8

Cited by 2 publications

(3 citation statements)

References 93 publications

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“…Although the production of secondary protonemata from adult gametophyte tissues is well known in other mosses (Bopp, 1984;Knoop, 1984), as far as we are aware it has not hitherto been recorded in Sphagnum. This discovery of filaments on regenerating shoots contradicts general statements that 'rhizoids' are absent in Sphagnum except on protonemata.…”

Section: The Morphogenesis Of Sphagnummentioning

confidence: 86%

“…Whether derived from shoots or spores it has the following attributes: colourless walls, numerous chloroplasts, oblique cross-walls and sparse irregular branching. The first two are normally associated with caulonema (Bopp, 1984), the last with rhizoids (Crundwell, 1979) and oblique cross-walls are common to both. Nevertheless, even in bryopsid mosses, in spite of an increasing accumulation of morphological and physiological data, the distinction between caulonema and rhizoids is far from clear (Knoop, 1984).…”

Section: The Morphogenesis Of Sphagnummentioning

confidence: 99%

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REGENERATION OF SPHAGNUM

1986

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SUMMARYWhen disc-shaped horizontal slices of peat cores, three from a bog in mid-Wales and three from a bog in Hampshire, were kept for several months in a saturated atmosphere in a cool greenhouse numerous new shoots of Sphagnum papillosum (Lindb. 5. magellanicum Brid. and S. recurvum P. Beauv. w^ere produced.The new shoots arose on peat discs from at least 30 cm below the surface and water table and from regions in which the Sphagnum appeared to be brown and dead. A timescale, inferred from the cumulative dry mass and the peak in ^^^Cs concentration (which was assumed, conservatively, to refiect the 1963 peak influx), indicates that the matrix of the deepest discs from which new shoots arose was from 25 to perhaps 60 years old.Many of the new shoots of Sphagnum arose as innovations from the outer cortex of buried stems. In most cases the first leaves on these had the usual dimorphic leaf cell pattern. Other shoots, which initially produced leaves with monomorphic cells, arose from protonemata, comprising irregularly lobed plates of tissue and sparsely branched filaments with oblique cross-walls. A few of the protonemata arose from old stems, a feature not reported before, but the vast majority had no attachment to old plants and are thought to have grown from spores.Ligbt and air were necessary if new shoots were to appear. But very few innovations or protonemata were found in the green discs from near the surface of the core. Tbis suggests some kind of hormonal control of innovations akin to apical dominance in vascular plants and a more general allelopatbic inhibition of spore germination and protonemal growth by green Sphagnum.Fern gametopbytes of at least two taxa (Dryopteris-Mke and Pteridium-like) grew on tbe peat discs witb distribution patterns similar to tbose of new Sphagnum sboots. Seedlings of five taxa of vascular plants -all species growing close to tbe core-sites -appeared on tbe peat discs but mucb more erratically tban Sphagnum and tbe ferns. Stems of five species of leafy liverwort, presumed to bave been derived from subterranean axes rather tban from gemmae or spores, were also recorded, but no otber bryopbytes were seen.Tbe discovery tbat morphogenesis in Sphagnum is far more fluid tban bitberto assumed has far-reacbing pbysiological, ecological and possibly genetical implications. Tbe development of protonemata under semi-natural conditions, recorded bere for tbe first time, confounds the results of culture experiments wbicb bad indicated tbat Sphagnum protonemata were unlikely to grow on peat.

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Section: The Morphogenesis Of Sphagnummentioning

confidence: 86%

Section: The Morphogenesis Of Sphagnummentioning

confidence: 99%

REGENERATION OF SPHAGNUM

1986

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“…This question will be addressed by examining the occurrence of higher plant hormones in lower plants and the effect of applied hormones on cell expansion in the algae and fungi. For information on hormone effects on the ferns, mosses, and liverworts the reader may see BRIAN (1963), MILLER et al (1970), BAHRE (1976, and Bopp (1980Bopp ( , 1983.…”

Section: Lower Plantsmentioning

confidence: 99%

Functions of Hormones at the Cellular Level of Organization

Evans¹

1984

Hormonal Regulation of Development II

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Developmental Physiology

Cited by 2 publications

References 93 publications

REGENERATION OF SPHAGNUM

REGENERATION OF SPHAGNUM

Functions of Hormones at the Cellular Level of Organization

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