Physiology of Poikilohydric Plants

Hartung, Wolfram; Schiller, Petra; Dietz, Karl‐Josef

doi:10.1007/978-3-642-80446-5_11

Cited by 74 publications

(43 citation statements)

References 70 publications

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“…For example, between the day of stomatal closure (approximately day 5) and day 30 without irrigation, ABA contents of roots approximately tripled, with ABA levels exceeding 2 nmol g DM -1 in SC I on day 30. These extraordinarily high values are comparable to those found in desiccated tissues of resurrection plants such as Chamaegigas intrepidus or Craterostigma plantagineum (Schiller et al 1997), and exceed those of severely drought stressed root tissue of most homoiohydric plants by about an order of magnitude (Hartung et al 1998;Hose et al 2001;W. Hartung, unpublished data).…”

Section: Discussionsupporting

confidence: 53%

Ecophysiological consequences of differences in plant size: abscisic acid relationships in the epiphytic orchid Dimerandra emarginata

2001

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Changes in abscisic acid (ABA) content and several water relations parameters were studied in the epiphytic orchid Dimerandra emarginata in the tropical lowlands of Barro Colorado Island, Panama. Similar to previous observations of size dependency of physiological parameters in vascular epiphytes, we found significant differences in ABA accumulation (both in terms of temporal patterns and amount) in small and large plants under drought stress. The highest values of ABA content in leaves, stems, and roots were found in the smaller specimens, reaching the levels of poikilohydric resurrection plants. Substantial accumulation of ABA occurred after stomatal closure, indicating other functions of ABA than stomatal regulation in this bark epiphyte.

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Section: Discussionsupporting

confidence: 53%

Ecophysiological consequences of differences in plant size: abscisic acid relationships in the epiphytic orchid Dimerandra emarginata

2001

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“…A striking and highly specialised desiccationtolerant species in rock pools is the Scrophulariaceae Lindernia intrepidus (= Chamaegigas intrepidus), an endemic to Namibia. The behavior of this desiccationtolerant water plant has been described in detail by Heil (1925), Ziegler & Vieweg (1970) and Hartung et al (1998). The species has ephemeral swimming leaves on the water surface and perennial bulb-like underwater leaves.…”

Section: Adaptive Traitsmentioning

confidence: 98%

Tropical inselbergs: habitat types, adaptive strategies and diversity patterns

Porembski¹

2007

Rev. bras. Bot.

211

185

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-(Tropical inselbergs: habitat types, adaptive strategies and diversity patterns). Inselbergs are isolated rock outcrops that rise abruptly above the surrounding plains. Granitic and gneissic inselbergs are geologically and geomorphologically old and occur throughout a broad spectrum of climatic zones. They form microclimatically and edaphically dry growth sites that support a highly specialized vegetation. Based on physiognomic criteria a number of habitat types can be distinguished that are widespread on inselbergs (e.g. ephemeral flush vegetation, monocotyledonous mats, rock pools). Three hot spots of global inselberg plant diversity can be identified which are both rich in species and endemics: a) southeastern Brazil, b) Madagascar and c) southwestern Australia.Key words -adaptive traits, conservation, endemics, rock outcrops, species richness RESUMO -(Inselbergs tropicais: tipos de hábitats, estratégias adaptativas e padrões de diversidade). "Inselbergs" são afloramentos rochosos isolados que emergem abruptamente acima das planícies que os cercam. Inselbergs graníticos e gnássicos são geologicamente e geomorfologicamente antigos e ocorrem ao longo de um amplo espectro de zonas climáticas. Eles formam sítios de crescimento que são microclimaticamente e edaficamente secos, e sustentam uma vegetação altamente especializada. Vários tipos de hábitats podem ser distinguidos, com base em critérios fisionômicos, que são comuns a vários inselbergs (e.g., vegetação de floração efêmera, "tapetes" de monocotiledôneas, "panelas" rochosas). Três regiões importantes do mundo com diversidade de vegetais típicos de inselbergs, podem ser apontados, que são ricos tanto em espécies quanto em endemismos; são elas: a) o sudeste do Brasil, b) Madagascar e c) o sudoeste da Austrália.Palavras-chave -afloramentos rochosos, características adaptativas, conservação, endemismos, riqueza de espécies

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“…Resurrection plants provide unique model systems to investigate the relationship between desiccation stress and the cell wall (Vicré et al, 2004a). In addition, resurrection plants display tolerance to other abiotic stresses, such as hypersalinity and high temperature (Gaff and Wood, 1988;Gaff, 1989;Hartung et al, 1998). This is not surprising because acquiring tolerance to a specific stress often results in some tolerance of related stresses (Mowla et al, 2002) due to cross talk in stress response pathways (Bartels and Salamini, 2001).…”

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confidence: 99%

Response of the Leaf Cell Wall to Desiccation in the Resurrection Plant Myrothamnus flabellifolius

et al. 2006

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The Myrothamnus flabellifolius leaf cell wall and its response to desiccation were investigated using electron microscopic, biochemical, and immunocytochemical techniques. Electron microscopy revealed desiccation-induced cell wall folding in the majority of mesophyll and epidermal cells. Thick-walled vascular tissue and sclerenchymous ribs did not fold and supported the surrounding tissue, thereby limiting the extent of leaf shrinkage and allowing leaf morphology to be rapidly regained upon rehydration. Isolated cell walls from hydrated and desiccated M. flabellifolius leaves were fractionated into their constituent polymers and the resulting fractions were analyzed for monosaccharide content. Significant differences between hydrated and desiccated states were observed in the water-soluble buffer extract, pectin fractions, and the arabinogalactan protein-rich extract. A marked increase in galacturonic acid was found in the alkali-insoluble pectic fraction. Xyloglucan structure was analyzed and shown to be of the standard dicotyledonous pattern. Immunocytochemical analysis determined the cellular location of the various epitopes associated with cell wall components, including pectin, xyloglucan, and arabinogalactan proteins, in hydrated and desiccated leaf tissue. The most striking observation was a constitutively present high concentration of arabinose, which was associated with pectin, presumably in the form of arabinan polymers. We propose that the arabinan-rich leaf cell wall of M. flabellifolius possesses the necessary structural properties to be able to undergo repeated periods of desiccation and rehydration.

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Physiology of Poikilohydric Plants

Cited by 74 publications

References 70 publications

Ecophysiological consequences of differences in plant size: abscisic acid relationships in the epiphytic orchid Dimerandra emarginata

Ecophysiological consequences of differences in plant size: abscisic acid relationships in the epiphytic orchid Dimerandra emarginata

Tropical inselbergs: habitat types, adaptive strategies and diversity patterns

Response of the Leaf Cell Wall to Desiccation in the Resurrection Plant Myrothamnus flabellifolius

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