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Statements

Subject Item
n2:RIV%2F00023272%3A_____%2F11%3A%230001638%21RIV12-MK0-00023272
rdf:type
n7:Vysledek skos:Concept
dcterms:description
Polyploidization is an important mechanism of sympatric speciation, but few studies have addressed breeding barriers between polyploids and their diploid progenitors in the field, and the available data have been mainly obtained from diploid-tetraploid contact zones. In contrast to diploid-tetraploid complexes, hybridization between diploid and hexaploid individuals may lead to viable fertile tetraploid offspring, and thus the interactions between these ploidy levels can be more complex. We investigated the breeding barriers operating between diploid and hexaploid individuals of Aster amellus at a contact zone in Central Europe to understand the absence of hybrids (i.e., tetraploids) and mixed populations. Phenological segregation, assortative mating mediated by pollinators and crossing ability were assessed under natural and controlled conditions in diploid and hexaploid populations growing in close proximity. The results revealed low levels of reproductive isolation (RI) due to flowering phenology (RI = 11–45%) and pollinator behavior (RI = 17%), so that pollen transfer between diploids and hexaploids is possible. In contrast, almost complete reproductive isolation was observed due to a series of post-pollination barriers that significantly reduced the production of offspring from inter-cytotype crosses (RI = 99.9%), even though some tetraploids were detected in seeds and seedlings. We conclude that the absence of tetraploids at the contact zone is probably due to a combination of several factors, including spatial segregation, strong post-pollination barriers (such as gametic isolation, low viability of tetraploid seeds and/or inability of tetraploid plants to reach the flowering stage), and to a lesser extent, temporal and behavioral segregation. Future studies should explore the fitness of tetraploids and the effect of different traits on the reproductive success and fitness of each cytotype. Polyploidization is an important mechanism of sympatric speciation, but few studies have addressed breeding barriers between polyploids and their diploid progenitors in the field, and the available data have been mainly obtained from diploid-tetraploid contact zones. In contrast to diploid-tetraploid complexes, hybridization between diploid and hexaploid individuals may lead to viable fertile tetraploid offspring, and thus the interactions between these ploidy levels can be more complex. We investigated the breeding barriers operating between diploid and hexaploid individuals of Aster amellus at a contact zone in Central Europe to understand the absence of hybrids (i.e., tetraploids) and mixed populations. Phenological segregation, assortative mating mediated by pollinators and crossing ability were assessed under natural and controlled conditions in diploid and hexaploid populations growing in close proximity. The results revealed low levels of reproductive isolation (RI) due to flowering phenology (RI = 11–45%) and pollinator behavior (RI = 17%), so that pollen transfer between diploids and hexaploids is possible. In contrast, almost complete reproductive isolation was observed due to a series of post-pollination barriers that significantly reduced the production of offspring from inter-cytotype crosses (RI = 99.9%), even though some tetraploids were detected in seeds and seedlings. We conclude that the absence of tetraploids at the contact zone is probably due to a combination of several factors, including spatial segregation, strong post-pollination barriers (such as gametic isolation, low viability of tetraploid seeds and/or inability of tetraploid plants to reach the flowering stage), and to a lesser extent, temporal and behavioral segregation. Future studies should explore the fitness of tetraploids and the effect of different traits on the reproductive success and fitness of each cytotype.
dcterms:title
Breeding barriers at a diploid–hexaploid contact zone in Aster amellus Breeding barriers at a diploid–hexaploid contact zone in Aster amellus
skos:prefLabel
Breeding barriers at a diploid–hexaploid contact zone in Aster amellus Breeding barriers at a diploid–hexaploid contact zone in Aster amellus
skos:notation
RIV/00023272:_____/11:#0001638!RIV12-MK0-00023272
n7:predkladatel
n14:ico%3A00023272
n3:aktivita
n16:Z n16:I n16:P
n3:aktivity
I, P(GA526/08/0706), P(GPP506/10/P188), Z(AV0Z60050516), Z(MK00002327201), Z(MSM0021620828)
n3:cisloPeriodika
4
n3:dodaniDat
n12:2012
n3:domaciTvurceVysledku
n11:2010070
n3:druhVysledku
n18:J
n3:duvernostUdaju
n15:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
188729
n3:idVysledku
RIV/00023272:_____/11:#0001638
n3:jazykVysledku
n20:eng
n3:klicovaSlova
Flow cytometry; Phenology; Pollination experiment; Pollinator behavior; Polyploid aggregate; Tetraploids
n3:klicoveSlovo
n6:Tetraploids n6:Flow%20cytometry n6:Polyploid%20aggregate n6:Pollination%20experiment n6:Pollinator%20behavior n6:Phenology
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[215CE47A32AB]
n3:nazevZdroje
Evolutionary Ecology
n3:obor
n19:EF
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
4
n3:projekt
n9:GA526%2F08%2F0706 n9:GPP506%2F10%2FP188
n3:rokUplatneniVysledku
n12:2011
n3:svazekPeriodika
25
n3:tvurceVysledku
Castro, Silvia Raabová, Jana Loureiro, Joao Münzbergová, Zuzana
n3:wos
000291751000005
n3:zamer
n10:MK00002327201 n10:AV0Z60050516 n10:MSM0021620828
s:issn
0269-7653
s:numberOfPages
20
n8:doi
10.1007/s10682-010-9439-5