Reproductive and Competitive Interactions Among Gametophytes of the Allotetraploid Fern Dryopteris corleyi and its Two Diploid Parents Export

@article{citeulike:3402079, abstract = {Background and AimsSeveral models predict that the establishment of polyploids within diploid populations is enhanced by non-random mating (i.e. selfing and assortative mating) of cytotypes and by a higher relative fitness of polyploids. This report assesses the role that antheridiogens (i.e. maleness-inducing pheromones) and intercytotype differences in growth rate have on polyploid performance. MethodsThree buckler-fern species were studied: the allotetraploid Dryopteris corleyi and its diploid parents, D. aemula and D. oreades. In one experiment, gametophytes of these species were cultured under rich growth conditions to compare the timing of gametangia production. The substrata on which these gametophytes had grown were used as antheridiogen sources in a second experiment. The three species were combined as source and target of antheridiogen (i.e. nine species pairs). Timing of antheridia production and gametophyte size were determined after those antheridiogen treatments. Key ResultsUnder rich growth conditions the allotetraploid produced archegonia earlier than those of diploid parents. Female gametophytes of the three species produced antheridiogens that inhibited growth and favoured maleness both within and among species. Gametophyte size was similar in the three species but antheridia formed earlier in the allotetraploid. ConclusionsUnisexuality, promoted by non-specific antheridiogens, enhances random mating both within and among species. The resulting hybridization can favour the reproductive exclusion of the allopolyploid in sites where it is outnumbered by diploids. However, the earlier production of gametangia in the allotetraploid favours assortative mating and may thus counterbalance reproductive exclusion. 10.1093/aob/mcn099}, author = {Jimenez, Ares and Quintanilla, Luis G. and Pajaron, Santiago and Pangua, Emilia}, citeulike-article-id = {3402079}, citeulike-linkout-0 = {http://dx.doi.org/10.1093/aob/mcn099}, citeulike-linkout-1 = {http://aob.oxfordjournals.org/cgi/content/abstract/102/3/353}, citeulike-linkout-2 = {http://view.ncbi.nlm.nih.gov/pubmed/18567915}, citeulike-linkout-3 = {http://www.hubmed.org/display.cgi?uids=18567915}, day = {1}, doi = {10.1093/aob/mcn099}, journal = {Ann Bot}, keywords = {breeding\_system, isolation, polyploidy}, month = {September}, number = {3}, pages = {353--359}, posted-at = {2008-10-13 22:56:34}, priority = {2}, title = {Reproductive and Competitive Interactions Among Gametophytes of the Allotetraploid Fern Dryopteris corleyi and its Two Diploid Parents}, url = {http://dx.doi.org/10.1093/aob/mcn099}, volume = {102}, year = {2008} }

TY - JOUR ID - citeulike:3402079 L3 - citeulike-article-id:3402079 N2 - Background and AimsSeveral models predict that the establishment of polyploids within diploid populations is enhanced by non-random mating (i.e. selfing and assortative mating) of cytotypes and by a higher relative fitness of polyploids. This report assesses the role that antheridiogens (i.e. maleness-inducing pheromones) and intercytotype differences in growth rate have on polyploid performance. MethodsThree buckler-fern species were studied: the allotetraploid Dryopteris corleyi and its diploid parents, D. aemula and D. oreades. In one experiment, gametophytes of these species were cultured under rich growth conditions to compare the timing of gametangia production. The substrata on which these gametophytes had grown were used as antheridiogen sources in a second experiment. The three species were combined as source and target of antheridiogen (i.e. nine species pairs). Timing of antheridia production and gametophyte size were determined after those antheridiogen treatments. Key ResultsUnder rich growth conditions the allotetraploid produced archegonia earlier than those of diploid parents. Female gametophytes of the three species produced antheridiogens that inhibited growth and favoured maleness both within and among species. Gametophyte size was similar in the three species but antheridia formed earlier in the allotetraploid. ConclusionsUnisexuality, promoted by non-specific antheridiogens, enhances random mating both within and among species. The resulting hybridization can favour the reproductive exclusion of the allopolyploid in sites where it is outnumbered by diploids. However, the earlier production of gametangia in the allotetraploid favours assortative mating and may thus counterbalance reproductive exclusion. 10.1093/aob/mcn099 IS - 3 JF - Ann Bot EP - 359 TI - Reproductive and Competitive Interactions Among Gametophytes of the Allotetraploid Fern Dryopteris corleyi and its Two Diploid Parents VL - 102 SP - 353 KW - breeding_system KW - isolation KW - polyploidy AU - Jimenez, Ares AU - Quintanilla, Luis AU - Pajaron, Santiago AU - Pangua, Emilia PY - 2008/09/01/ UR - http://dx.doi.org/10.1093/aob/mcn099 ER -