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Bilateral polyploidization inDactylis glomerata L. subsp.lusitanica: occurrence, morphological and genetic characteristics of first polyploids

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Summary

InDactylis glomerata L. subsp.lusitanica, triploid and tetraploid plants were obtained by bilateral sexual polyploidization in crosses between diploid parents known to produce 2n gametes. The polyploid and diploid progeny were compared for allozyme diversity (allele number and heterozygosity), phenological (pollen fertility, inflorescence emergence date), cellular (stomatic cell size) and morphological characters (vegetative biomass, seed weight, total seed number per plant, panicle number and seed number per panicle length) in four contrasting growing conditions. Stomatal cell size and the total number of alleles were significantly lower in diploids than in polyploids which sometimes recovered more than two distinct alleles at a locus via 2n gametes possessing heterozygous loci. Pollen fertility was similar in diploids and tetraploids, but significantly lower in the triploids. Seed weight was significantly higher in polyploids, although the average number of seeds per panicle length and the total number of seeds was higher in the diploid sibs. No phenological differences occurred among ploidy levels whereas such differences were observed inDactylis in all the natural areas of sympatry between diploids and their related polyploids. Our results provide evidence for an instantaneous effect of polyploidization on certain traits and suggest that natural selection would act subsequently on several other traits to allow the establishment of new polyploids.

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  1. Department of Population Biology, CEFE Centre Louis Emberger, BP 5051, 34033, Montpellier Cedex, France

    F. Bretagnolle & R. Lumaret

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  1. F. Bretagnolle
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Bretagnolle, F., Lumaret, R. Bilateral polyploidization inDactylis glomerata L. subsp.lusitanica: occurrence, morphological and genetic characteristics of first polyploids. Euphytica 84, 197–207 (1995). https://doi.org/10.1007/BF01681812

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