Abstract
Polyploidization is thought to result in instant sympatric speciation, but several cases of hybrid zones between one of the parental species and its polyploid derivative have been documented. Previous work showed that diploid Sphagnum lescurii is an allopolyploid derived from the haploids S. lescurii (maternal progenitor) and S. subsecundum (paternal progenitor). Here, we report the results from analyses of a population where allodiploid and haploid S. lescurii co-occur and produce sporophytes. We tested (i) whether haploids and diploids form hybrid triploid sporophytes; (ii) how hybrid and nonhybrid sporophytes compare in fitness; (iii) whether hybrid sporophytes form viable spores; (iv) the ploidy of any viable gametophyte offspring from hybrid sporophytes; (v) the relative viability of sporelings derived from hybrid and nonhybrid sporophytes; and (vi) if interploidal hybridization results in introgression between the allopolyploid and its haploid progenitor. We found that triploid hybrid sporophytes do occur and are larger than nonhybrid sporophytes, but exhibit very low germination percentages and produce sporelings that develop more slowly than those from nonhybrid sporophytes. All sporophytes attached to haploid gametophytes were triploid and were sired by diploid males, but all sporophytes attached to diploid gametophytes were tetraploid. This asymmetric pattern of interploidal hybridization is related to an absence of haploid male gametophytes in the population. Surprisingly, all sporelings from triploid sporophytes were triploid, yet were genetically variable, suggesting some form of aberrant meiosis that warrants further study. There was limited (but some) evidence of introgression between allodiploid and haploid S. lescurii.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Triploid hybrid sporophytes occurred.
- Outcome
- triploid hybrid sporophytes do occure0
SphagnumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“triploid hybrid sporophytes do occur”
t0“Sphagnum”
Claim · model-written summary
Triploid hybrid sporophytes were larger than nonhybrids.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“triploid hybrid sporophytes do occur and are larger than nonhybrid sporophytes”
t0“Sphagnum”
Claim · model-written summary
Triploid hybrid sporophytes had very low germination.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exhibit very low germination percentages”
t0“Sphagnum”
Claim · model-written summary
Sporelings of triploid hybrids developed more slowly than nonhybrids.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“produce sporelings that develop more slowly than those from nonhybrid sporophytes”
t0“Sphagnum”
Claim · model-written summary
All sporophytes on haploid gametophytes were triploid and sired by diploid males.
- Outcome
- sporophytes attached to haploid gametophytes were triploid and were sired by diploid malese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All sporophytes attached to haploid gametophytes were triploid and were sired by diploid males”
t0“Sphagnum”
Claim · model-written summary
All sporophytes on diploid gametophytes were tetraploid.
- Outcome
- sporophytes attached to diploid gametophytes were tetraploide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all sporophytes attached to diploid gametophytes were tetraploid”
t0“Sphagnum”
Claim · model-written summary
Haploid male gametophytes were absent.
- Outcome
- absence of haploid male gametophytese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“absence of haploid male gametophytes in the population”
t0“Sphagnum”
Claim · model-written summary
All sporelings from triploid sporophytes were triploid.
- Outcome
- sporelings from triploid sporophytes were triploide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all sporelings from triploid sporophytes were triploid, yet were genetically variable”
t0“Sphagnum”
Claim · model-written summary
Triploid-derived sporelings were genetically variable.
- Outcome
- sporelings from triploid sporophytes were triploid, yet were genetically variablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all sporelings from triploid sporophytes were triploid, yet were genetically variable”
t0“Sphagnum”
Claim · model-written summary
There was limited evidence of introgression between allodiploid and haploid S. lescurii.
- Taxon
- S. lescurii
Sphagnum lescuriie0 - Outcome
- introgression between allodiploid and haploid S. lescuriie0
- Qualifier
- limited (but some)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was limited (but some) evidence of introgression between allodiploid and haploid S. lescurii”