| identification of new isolates of turnip mosaic virus that cluster with less common viral strains. | turnip mosaic virus (tumv) was found infecting cultivated brassicas and wild and cultivated ornamental brassicaceae plants in different regions of spain. five new tumv isolates, originating from different host plant species (brassica cretica, brassica juncea, brassica napus, eruca vesicaria subsp. sativa and sisymbrium orientale), have been identified. the nucleotide sequences of the coat protein (cp) genes of the five isolates were determined. phylogenetic analysis of the cp sequences showed th ... | 2007 | 17347771 |
| molecular population genetics of the srk and scr self-incompatibility genes in the wild plant species brassica cretica (brassicaceae). | self-incompatibility (si) in plants is a classic example of a trait evolving under strong frequency-dependent selection. as a consequence, population genetic theory predicts that the s locus, which controls si, should maintain numerous alleles, display a high level of nucleotide diversity, and, in structured populations, show a lower level of among-population differentiation compared to neutral loci. population-level investigations of dna sequence variation at the s locus have recently been carr ... | 2009 | 19087967 |
| the evolution and diversification of s-locus haplotypes in the brassicaceae family. | self-incompatibility (si) in the brassicaceae plant family is controlled by the srk and scr genes situated at the s locus. a large number of s haplotypes have been identified, mainly in cultivated species of the brassica and raphanus genera, but recently also in wild arabidopsis species. here, we used dna sequences from the srk and scr genes of the wild brassica species brassica cretica, together with publicly available sequence data from other brassicaceae species, to investigate the evolutiona ... | 2009 | 19087966 |
| unequal segregation of srk alleles at the s locus in brassica cretica. | in the brassicaceae plant family, which includes the arabidopsis and brassica genera, self-incompatibility (si) is controlled by genes at the s locus. using experimental crosses, we studied the pattern of inheritance of s-locus alleles in the wild species brassica cretica. four full-sib families were established and unequal segregation of alleles at the srk si gene was found in one family. the segregation distortion acted in favour of a recessive (class ii) allele and was best explained by some ... | 2008 | 18593509 |
| nuclear and chloroplast microsatellites reveal extreme population differentiation and limited gene flow in the aegean endemic brassica cretica (brassicaceae). | nuclear and chloroplast microsatellite markers were used to study population structure and gene flow among seven cretan populations of the aegean endemic plant species brassica cretica (brassicaceae). both nuclear and chloroplast markers revealed exceptionally high levels of population differentiation (overall f(st)=0.628 and 1.000, respectively) and relatively little within-population diversity (overall h(s)=0.211 and 0.000, respectively). maximum-likelihood estimates of directional migration r ... | 2007 | 17956541 |
| flower and cotyledon asymmetry in brassica cretica: genetic variation and relationships with fitness. | plants of the partially self-incompatible perennial herb brassica cretica, derived from controlled cross- and self-pollinations within each of seven populations, were raised under uniform conditions and scored for two measures of developmental stability, flower asymmetry (quantified as the difference in length and width between opposite petals) and cotyledon asymmetry (quantified as the difference in the area of the two lobes of each cotyledon). the primary goals were to assess the level of heri ... | 2002 | 12038527 |
| developmental stability in brassica cretica: the effect of crossing distance on fluctuating asymmetry in cotyledon morphology. | in the present investigation of brassica cretica, a wild relative of the cultivated cabbage, b. oleracea, we performed an extensive crossing experiment, involving self-pollinations, random outcrosses within populations and hybridizations between populations or species, to evaluate the relationship between crossing distance and developmental stability, estimated as the absolute difference between the right and left lobe of the cotyledons. the frequency distribution of the right-minus-left scores ... | 2002 | 11920121 |