Sensitivity to H- and Al ions limiting growth and distribution of the woodland grass Bromus benekenii

1993 ◽  
Vol 153 (2) ◽  
pp. 243-254 ◽  
Author(s):  
Maud E. Andersson ◽  
J�rg Brunet
Keyword(s):  
Bromus Benekenii

Chromosome pairing affinities between Old and New World species of Bromus section Pnigma

1984 ◽  
Vol 62 (3) ◽  
pp. 581-585 ◽  
Author(s):  
K. C. Armstrong
Keyword(s):  
Chromosome Pairing ◽  
Interspecific Hybrids ◽  
New World ◽  
Genetic Factors ◽  
Low Frequency ◽  
World Species ◽  
The North ◽  
Evolutionary Pathways ◽  
Bromus Benekenii ◽  
Eurasian Species

A low frequency of allosyndetic chromosome pairing occurred in interspecific hybrids between species having large chromosomes (Bromus benekenii (Lange) Trimen, 2n = 4x = 28; B. ramosus Huds., 2n = 4x = 28; B. pacificus Shear, 2n = 4x = 28) and species having small chromosomes (B. erectus Huds., 2n = 4x = 28; B. inermis Leyss, 2n = 4x = 28; B. pumpellianus Scribn., 2n = 4x = 28; B. riparius Rehm, 2n = 10x = 70; and B. variegatus, 2n = 2x = 14). These results are consistent with the suggestion that the large (predominantly Eurasion) and small (predominantly American) chromosome species of section Pnigma have followed different evolutionary pathways. Chromosome pairing in interspecific hybrids revealed low affinities between the chromosomes of the Eurasian species B. ramosus and the North American species B. pacificus. Thus there was no evidence that B. ramosus contained a form of the L genome found in American species. However genetic factors suppressing homoeologous pairing could be present in the allotetraploid parents.

scholarly journals Additivity of ISSR Markers in Natural Hybrids of Related Forest Species Bromus benekenii and B. ramosus (Poaceae)

2015 ◽  
Vol 57 (1) ◽  
pp. 82-94 ◽  
Author(s):  
Agnieszka Sutkowska ◽  
Andrzej Pasierbzziński ◽  
Wojciech Bąba ◽  
Tomasz Warzecha ◽  
Józef Mitka
Keyword(s):  
Parental Species ◽  
Issr Markers ◽  
Hybrid Population ◽  
Ecological Niches ◽  
Coding Regions ◽  
The Face ◽  
Bromus Benekenii ◽  
Landscape Transformations ◽  
Distribution In Europe

AbstractThe co-occurrence of hybrids and parental species in similar ecological niches poses a question on the role of traits additivity and overdispersion (emergence of new traits) in microevolutionary processes. We analysed genetic polymorphism ofBromus benekenii,B. ramosusand the spontaneous hybridB. benekenii×B. ramosusin sympatric and allopatric parts of the species distribution in Europe, based on non-coding regions of the taxon genomes (ISSR genetic fingerprinting). We tested 68 individuals in 7 populations, including a hybrid population in N France. Altogether 233 polymorphic ISSR bands (loci) were obtained. We found that the parent species were genetically distinct and the hybrids had an additive pattern of ISSR bands found in the putative parental species (NMDS, STRUCTURE); however, there was evidence of introgression towardsB. ramosus(NEWHYBRIDS, UPGMA classifications, Nei's D genetic distance).Bromus benekeniihad 72,B. ramosus21 and the hybrids 9 private bands (genetic overdispersion), probably resulting from the rearranged genomes. Based on its low genetic divergence index DW, the hybrid population seems to be at a young age. We argue that in the face of anthropogenic landscape transformations favouring secondary contacts, the hybrids may competitively replace the parental species in sympatric areas.

Sensitivity of plants to acidic soils exemplified by the forest grass Bromus benekenii

1995 ◽  
Vol 85 (3) ◽  
pp. 1233-1238 ◽  
Author(s):  
Ursula Falkengren-Grerup ◽  
J�rg Brunet ◽  
Maud E. Quist
Keyword(s):  
Acidic Soils ◽  
Bromus Benekenii
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