Sur la valeur taxinomique de l'<i>Agropyrum acutum</i>Roehm. et S.—Contrôle cytologique

Simonet, Marc

doi:10.1080/00378941.1934.10834027

Cited by 11 publications

(5 citation statements)

References 9 publications

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“…There is evidence of the limited success of pentaploids in other groups. In Agropyron spp,, for example, there are Agropyron diivalii [zn = 35, 42) (Simonet, 1935), the hybrid species A. acutum {zn = 35) (Simonet, 1934) and the natural hybrid A. ensyiix A. scabrum {zn = 35) (Connor, 1956). It can be recalled that one of our most important fibreproducing plants Agave sisalana {zn = 149) is also pentaploid (Granick, 1944), There are many other reports of pentaploids or other uneven polyploids, particularly in the grasses, but in most cases they are seed-producing apomicts which are not strictly comparable with H. mollis.…”

Section: Discussionmentioning

confidence: 99%

CYTOTAXONOMIC STUDIES IN HOLCUS

Jones

1958

New Phytologist

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With Plate 3 and 6 figures in the text) SUMMARY Studies have been made of the relative frequency and distribution in parts of Britain of the chromosome races oi Holcus mollis {zn = 28, 35, 42, 49). These show that the pentaploid is the most common race and that the distribution of the races as a whole is a reflection of varying degrees of adaptability to moisture content of the soil.Chromosome studies at meiosis and mitosis show that the tetraploid is an allopolyploid and that the hexaploid is derived from it. The pentaploid appears to be derived from a hybrid of H. lanatus {zn =14) and H. mollis {2n = 28).The hybrid nature of the pentaploid is confirmed by the discovery of natural triploid hybrids (2« = 21) from which it is presumed to have been derived by backcrossing to the tetraploid parent.With the exception of the tetraploid, the races of H. mollis reproduce almost exclusively by vegetative means. The tetraploid is fertile but is also likely to reproduce mainly by rhizomes.The success of the pentaploid is attributed to its hybrid vigour in both growth and adaptability to soil moisture. In addition its spread is favoured by the fact that its tetraploid parent does not offer much seed competition in the colonization of new areas. There is no competition from the H. lanatus parent which has different ecological requirements.It is considered feasible that the vigorous pentaploid could eventually supersede the other races of H. mollis.

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Section: Discussionmentioning

confidence: 99%

CYTOTAXONOMIC STUDIES IN HOLCUS

Jones

1958

New Phytologist

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“…junceiforme and E. repens (Heneen, 1962, 1963b). In addition, Simonet (1934) already attributed a hybrid origin to certain samples between A. littorale (= E. pycnantha ) and A. littoreum (= E. repens ), based on their intermediate morphology. He differentiated them by their leaves, which are planar, flat and green in E. repens , but glaucous, tightly inrolled and subulated at the tip in E. pycnantha , and at the level of a subtetragonal ear in E. pycnantha .…”

Section: Discussionmentioning

confidence: 99%

“…This latter species was not recognized by Dewey (1984). According to the taxonomic diagnoses, the samples described under E. pungens would in some cases correspond to E. pycnantha and in other cases to E. repens or to hybrid forms (Simonet, 1934; Kerguelen, 1975).…”

Section: Discussionmentioning

confidence: 99%

“…In later work, he considered that T. acutum resulted from the crossing of two other species because of its morphological characteristics, its habitat and the poor development of its pollen (Duval‐Jouve, 1875). Later studies on this genus confirmed the existence of many hybrids, for instance Rouy (1913), Prat (1931), Simonet (1934, 1935a, b), Östergren (1940a, b), Cauderon (1958, 1966) and Cauderon & Saigne (1961). Cauderon (1958, 1966) reported the frequency of hybridization as well as the presence of many intermediate forms.…”

Section: Introductionmentioning

confidence: 91%

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Characterization of a novel 9-ploid hybrid (2n = 63) with four genomes in an Elytrigia complex (Poaceae)

Refoufi

Esnault

Levasseur

2005

Botanical Journal of the Linnean Society

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The existence in the couch-grass complex of a particularly interesting new hybrid has been demonstrated in a previous work. It is 9-ploid (2 n = 63), comprising four genomes and could result from the fusion of a reduced gamete of Elytrigia repens and a non-reduced gamete of Elytrigia pycnantha . We provide a complementary characterization of this hybrid using morphological traits, enzymatic and RAPD markers in comparison with its parents, together with a description of the site (physiography and plant communities) of the studied population.

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“…Natural interspecific hybrids in Agropyron were studied in Europe (Simonet 1934(Simonet , 1935Ostergren 1940a, b ;Godley 1951 and others), in New Zealand (Conner 1956(Conner , 1957 and in North America (Dewey 1963). In the present study, two natural hybrids are reported involving one tetraploid, Ag.…”

Section: Discussionmentioning

confidence: 99%