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Titolo:
HABITAT DIFFERENTIATION AND COMPARATIVE BIOMASS ALLOCATIONS OF SOME TETRAPLOID AND PENTAPLOID POPULATIONS IN THE COMPLEX HOLCUS-MOLLIS L - DIFFERENTIAL RESPONSES TO NUTRIENT
Autore:
LAMADE E; BLAISE S; BRIANE JP; LACOSTE A;
Indirizzi:
UNIV PARIS 11,ECOL & BIOL VEGETALES LAB,URA 1492,BATIMENT 362 F-91405ORSAY FRANCE
Titolo Testata:
Acta oecologica
fascicolo: 2, volume: 15, anno: 1994,
pagine: 133 - 150
SICI:
1146-609X(1994)15:2<133:HDACBA>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHENOTYPIC PLASTICITY; PLANTS;
Keywords:
HOLCUS-MOLLIS; BIOMASS ALLOCATION; CYTOTYPES; DISTRIBUTION; FERTILIZER; GRADIENT; NITROGEN FERTILIZER; NUTRIENT NITROGEN; PENTAPLOID; POPULATIONS; TETRAPLOID;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
50
Recensione:
Indirizzi per estratti:
Citazione:
E. Lamade et al., "HABITAT DIFFERENTIATION AND COMPARATIVE BIOMASS ALLOCATIONS OF SOME TETRAPLOID AND PENTAPLOID POPULATIONS IN THE COMPLEX HOLCUS-MOLLIS L - DIFFERENTIAL RESPONSES TO NUTRIENT", Acta oecologica, 15(2), 1994, pp. 133-150

Abstract

The tetraploid and pentaploid forms of the complex Holcus mollis L., morphologically indistinguishable, have different ecological distributions in the Paris region. The tetraploid (2n = 4x = 28) only occurs inacidophile oak forests on sandy soil (''Fontainebleau sand''), whereas the pentaploid (2n = 5x = 35) grows in a wide range of habitats, from old fields to pre-woody succession stages on sandy or clay soil. Theecological analysis of the composition of the vegetation and the soilof 15 sites containing H. mollis shows the fine habitat differentiation between the two polyploid forms in the Paris region. The effects ofexperimental manipulations of these environmental factors, e.g. soil nutrient levels, on their respective biomass allocation patterns may account for the observed distribution. Populations of H. mollis from four of these 15 stations, two tetraploid forest populations, one forestpentaploid population, and one old field pentaploid population, were compared, using firstly an experimental nutrient gradient, and secondly the addition of nitrogen fertiliser. Final biomass allocation (in g.of dry matter) to roots and rhizomes differed between the two cytotypes. Tetraploids produce significantly more rhizomes than pentaploids in more favourable environments. Forest populations had higher mean root production. These differences may have arisen from selective pressures related to their respective habitats or from their respective genetic backgrounds. The pentaploid has been shown to contain the haploid genome of a closely-related cespitous taxon, Holcus lanatus L.

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Documento generato il 02/07/20 alle ore 23:27:20