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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. Expand
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. Expand
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. Expand
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… Expand
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. Expand
REPRODUCTIVE BIOLOGY AND BREEDING SYSTEM OF GONOLOBUS SUBEROSUS (ASCLEPIADACEAE)
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. Expand
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. Expand
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. Expand
Mating systems and interfertility of swamp milkweed (Asclepias incarnata ssp. incarnata and ssp. pulchra)
The breeding system and interfertility of both subspecies of Asclepias incarnata were investigated, and swamp milkweed was found to be neither fully self-compatible nor self-incompatible, which adds to growing evidence of the complexity of milkweed breeding systems. Expand