Die Abhängigkeit der Bulbillenbildung beiPoa alpina vivipara von Photoperiodismus und Frost

Schwarzenbach, F. H.

doi:10.1007/bf02178333

Cited by 8 publications

(5 citation statements)

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“…Consequently, as grazed grasslands may be more heterogeneous than mown ones due to heterogeneous impacts by grazing animals, we expect higher plasticity in plants from grazed sites, particularly for reproductive characters. To some degree, also the mode of reproduction appears to be phenotypically plastic in Poa alpina, as was reported from experiments where plants turned pseudoviviparous at short day conditions and cold temperatures (Schwarzenbach 1953;Heide 1989).…”

Section: Introductionmentioning

confidence: 54%

“…Previous studies with P. alpina reported plastic responses of some, but by far not all, plants switching from pseudoviviparous to seminiferous reproduction after transplanting pseudoviviparous plants from cold to moderate temperatures (Schwarzenbach 1953;Bachmann 1980). Such switches seem to be the exception, as in our study, only 2 of 1,230 plants (0.16%) switched their reproductive mode between 2003 and 2004, and only 6 of 615 genotypes (0.98%) between the clipped and control replicate plant.…”

Section: Evidence For Adaptation Of Reproductionmentioning

confidence: 98%

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Adaptation of Poa alpina to altitude and land use in the Swiss Alps

et al. 2011

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Current land use and climate change are prompting questions about the ability of plants to adapt to such environmental change. Therefore, we experimentally addressed plant performance and quantitative-genetic diversity of the common Alpine Meadow Grass Poa alpina. We asked how land use and altitude affect the occurrence of P. alpina in the field and whether its common-garden performance suggests adaptation to conditions at plant origin and differences in quantitative genetic diversity among plant origins. Among 216 candidate grassland sites of different land use and altitude from 12 villages in the Swiss Alps, P. alpina occurred preferentially in fertilized and grazed sites and at higher elevations. In a common garden at 1,500 m asl, we grew two plants of [600 genotypes representing 78 grassland sites. After 2 years, nearly 90% of all plants had reproduced. In agreement with adaptive advantages of vegetative reproduction at higher altitudes, only 23% of reproductive plants from lower altitudes reproduced via vegetative bulbils, but 55% of plants from higher altitudes. In agreement with adaptive advantages of reproduction in grazed sites, allocation to reproductive biomass was higher in plants from grazed grasslands than from mown ones. For 53 grasslands, we also investigated broad-sense heritability H 2 , which was significant for all studied traits and twice as high for grazed as for mown grasslands. Moreover, possibly associated with their higher landscape diversity, H 2 was higher for sites of villages of Romanic cultural tradition than for those of Germanic and Walser traditions. We suggest promoting diverse land use regimes to conserve not only landscape and plant species diversity, but also adaptive genetic differentiation and heritable genetic variation.

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Section: Introductionmentioning

confidence: 54%

Section: Evidence For Adaptation Of Reproductionmentioning

confidence: 98%

Adaptation of Poa alpina to altitude and land use in the Swiss Alps

et al. 2011

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“…While it is known that bulbils are formed vegetatively by transforming fl ower meristem into a vegetative shoot, it is not clear to what extent seeds are formed sexually. Apomictic seed formation seems to be a possibility, especially if populations evolved their reproduction from a bulbil-to a seed-producing mode ( Müntzing, 1933( Müntzing, , 1940Schwarzenbach, 1953 ). Interestingly, the occurrence of seed-producing plants decreases and that of bulbilproducing plants increases with elevation ( Maurer, 2005 ;Fischer et al, 2011 ), which is in line with the hypothesis of an adaptive advantage of clonal reproduction in the harsher conditions at higher elevations ( Pluess and Stöcklin, 2005 ).…”

Section: Molecular Analyses -Sample Collection-mentioning

confidence: 63%

“…The molecular analysis of seed-producing P. alpina mothers and their offspring revealed that the majority of the analyzed plants produced their seeds apomictically, but some were partly outcrossing, as assumed by Müntzing (1933Müntzing ( , 1940 and Schwarzenbach (1953) . Four of eight analyzed mothers were able to perform meiosis, suggesting that the plants were facultative apomicts.…”

Section: Apomixis In Seed-producing Poa Alpina -mentioning

confidence: 99%

Distribution of bulbil‐ and seed‐producing plants of Poa alpina (Poaceae) and their growth and reproduction in common gardens suggest adaptation to different elevations

Steiner

Armbruster

Scheepens

et al. 2012

American J of Botany

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“…It is not known whether these sexual florets produce fertile pollen and viable seeds and whether there is gene flow between such florets and sexually reproducing plants. The mode of reproduction appears largely genetically determined, while phenotypic plasticity in the mode of reproduction plays a minor role (Schwarzenbach, 1953(Schwarzenbach, , 1956Heide, 1989).…”

Section: Study Speciesmentioning

confidence: 99%