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Floral morphology and late-acting self-incompatibility inApocynum cannabinum (Apocynaceae)
Results suggest that A. cannabium possesses late-acting self-incompatibility, similar to that in the closely related Asclepiadaceae.
Pollen-ovule Ratios in Milkweeds (Asclepiadaceae): an Exception that Probes the Rule
Data are consistent with the view that agglutination of pollen evolves in concert with ovule number to minimize the likelihood of receiving mixed pollen loads and are not consistent withThe view that pollen-ovule ratios reflect breeding system or pollination efficiency.
Single gene control of postzygotic self-incompatibility in poke milkweed, Asclepias exaltata L.
It is suggested that the occasional self-fertility documented in natural pollinations is caused by pseudo-self-f fertility alleles that alter the functioning of the S-locus.
Comparative Rates of Pollination and Fruit Set in Widely Separated Populations of a Rare Orchid (Cypripedium fasciculatum)
The percentage of open‐pollinated flowers maturing fruit varied greatly among populations, equaling 69% in Oregon, 29% in Idaho, and 18% in Colorado, suggesting managing for pollinator service may be unnecessary in the Oregon population.
Diallel crosses reveal patterns of variation in fruit-set, seed mass, and seed number in Asclepias incarnata
Plants from each of two populations of Asclepias incarnata ssp. incarnata were hand-pollinated in diallel crosses and seed number per fruit, mean individual seed mass per fruit and fruit-set were…
Genetic conservation in applied tree breeding programs.
The impact of breeding population size and structure on the maintenance of genetic variation and on continued genetic gain is considered.
A NEW EXPLANATION FOR THE EVOLUTION OF POLLINIA AND LOSS OF CARPEL FUSION IN ASCLEPIAS AND THE APOCYNACEAE S.L.1
It is argued that the evolution of pollinia and loss of carpel fusion in certain Apocynaceae represent adaptations to prevent or compensate for these negative effects of mixed pollen loads.
REPRODUCTIVE BIOLOGY AND BREEDING SYSTEM OF GONOLOBUS SUBEROSUS (ASCLEPIADACEAE)
Towards an Understanding of the Mixed Breeding System of Swamp Milkweed (Asclepias incarnata)
The results showed no evidence of increased abortion of self-pollinated fruits under conditions of competition with cross- pollinated fruits within the same flower or between flowers within umbels, and the success ofSelf-pollinations appeared to increase in flowers that had also received cross-pollination.
Population differences in self-fertility in the "self-incompatible" milkweed Asclepias exaltata (Asclepiadaceae).
Individual plants of Asclepias exaltata (Asclepiadaceae) typically express an unusual self-incompatibility system under single-gene control, which appears to be under genetic control, as the ability of most plants to set fruit following self-pollinations was identical under natural and greenhouse conditions.