Mating systems and interfertility of swamp milkweed (Asclepias incarnata ssp. incarnata and ssp. pulchra)

@article{Ivey1999MatingSA,
  title={Mating systems and interfertility of swamp milkweed (Asclepias incarnata ssp. incarnata and ssp. pulchra)},
  author={Christopher T. Ivey and Sara R. Lipow and Robert E. Wyatt},
  journal={Heredity},
  year={1999},
  volume={82},
  pages={25-35}
}
We investigated the breeding system and interfertility of both subspecies of Asclepias incarnata. We performed hand-pollinations in the glasshouse to compare fruit-set from self- vs. cross-pollinations and to assess interfertility in crosses between the subspecies. We also used horizontal starch-gel electrophoresis to infer mating-system parameters from open-pollinated progeny arrays in three natural populations over two consecutive years. Plants of ssp. incarnata were about 1/6 as likely to… Expand

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References

SHOWING 1-10 OF 29 REFERENCES
BREEDING SYSTEMS IN ASCLEPIAS INCARNATA L., A. SYRIACA L., AND A. VERTICILLATA L.
TLDR
A series of experimental pollinations involving three sympatric species provided strong evidence for physiological and/or genetic barriers to hybridization in Asclepias, and it is suggested that the potential for autogamy, combined with floral mechanisms requiring pollination by insects, insure the advantages of both the genetic variability promoted by outcrossing and the reproductive assurance of uniparental reproduction. Expand
POLLINATION AND FRUIT‐SET IN ASCLEPIAS: A REAPPRAISAL
TLDR
It is concluded that fruit-set in Asclepias is regulated by the interaction of both mechanical aspects of pollination and physiological aspects of fertilization and fruit development, as well as the relative importance of mechanical versus physiological interspecific isolating mechanisms. Expand
Outcrossing rates and correlated mating within a population of Eichhornia paniculata (Pontederiaceae)
TLDR
Measurements of mating patterns at the style morph and individual plant level within a population of tristylous Eichhornia paniculata from N.E. Brazil indicated a high level of outcrossing at the population level and Parameter estimates from the model suggest that progeny from individual plants result from matings to a limited number of male parents. Expand
The breeding system of desert milkweed, Asclepias subulata
TLDR
It appears that this unusual late-acting form of self-incompatibility, which is characteristic of milkweeds, arose early in the basal Asclepiadaceae/Apocynaceae clade and has been retained in both morphologically plesiomorphic and apomorphic lineages. Expand
Pollination genetics of the common milkweed, Asclepias syriaca L.
TLDR
Electrophoretic methods are used to determine the genotype of individual pollinia simultaneously at several isozyme loci for the common milkweed, Asclepias syriaca, and the rate of self-pollination in a population is found to be 66%. Expand
PATERNITY ANALYSIS IN A NATURAL POPULATION OF ASCLEPIAS EXALTATA: MULTIPLE PATERNITY, FUNCTIONAL GENDER, AND THE “POLLEN‐DONATION HYPOTHESIS”
  • S. Broyles, R. Wyatt
  • Biology, Medicine
  • Evolution; international journal of organic evolution
  • 1990
TLDR
Analysis of functional gender indicated that plants with many flowers did not behave primarily as males and females, and estimates of gender based on numbers of flowers produced or pollinaria removed overestimated the number of functional males in the population. Expand
COMPETITION‐DEPENDENT ABSCISSION OF SELF‐POLLINATED FLOWERS OF PHORMIUM TENAX (AGAVACEAE): A SECOND ACTION OF SELF‐INCOMPATIBILITY AT THE WHOLE FLOWER LEVEL?
TLDR
It is found that the success of selfed fruits is determined by the degree of competition with crossed fruits and may be an expression of self‐incompatibility. Expand
Estimation of the mating system in open-pollinated maize populations using isozyme polymorphisms.
TLDR
Isozyme variants were adopted as markers in this investigation because of their many advantages in studying such populational processes as the mating system and the results obtained when the method was applied to isozyme data from two open-pollinated populations of maize are presented. Expand
CROSSING‐DISTANCE EFFECTS IN DELPHINIUM NELSONII: OUTBREEDING AND INBREEDING DEPRESSION IN PROGENY FITNESS
  • N. Waser, M. V. Price
  • Biology, Medicine
  • Evolution; international journal of organic evolution
  • 1994
TLDR
Even though progeny of 1‐m crosses were inbred to a degree only about one‐eighth that of selling, inbreeding depression approximated 50%, and outbreeding depression equaled or exceeded 50% for all fitness components. Expand
ECOLOGY AND EVOLUTION OF REPRODUCTION IN MILKWEEDS
Asclepiadaceae are the dicot counterparts to the Orchidaceae, which also transmit their pollen grains in large groups within pollinia. Unlike many terrestrial, nectar-producing orchids, however,Expand
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