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Creator:: Stanley, Lauren, Forrester, Nicole J., Govindarajulu, Rajanikanth, Liston, Aaron, and Ashman, Tia-Lynn
Abstract:: Geographic patterns of genetic variation in wild species reflect the interplay of ecological and evolutionary processes. We assessed genetic variation in three genomes across four North American diploid strawberry taxa, with special emphasis on the gynodioecious Fragaria vesca subsp. bracteata (A.Heller) Staudt. Specifically, we sequenced one chloroplast (rpoC2) and two...
Resource Type:: Article
Full Text:: . This work was supported by 500 the University of Pittsburgh, the National Science Foundation (DEB

Creator:: Salamone, Isabella, Govindarajulu, Rajanikanth, Falk, Stacey, Parks, Matthew, Liston, Aaron, and Ashnam, Tia-Lynn
Abstract:: Premise of the Study: Hybrid zones provide "natural laboratories" for understanding the processes of selection, reinforcement, and speciation. We sought to gain insight into the degree of introgression and the extent of ecological-phenotypic intermediacy in the natural hybrid strawberry, Fragaria x ananassa subsp. cuneifolia. Methods: We used whole-plastome sequencing to...
Resource Type:: Article
Full Text:: was supported by the University of Pittsburgh, the National Science Foundation (DEB 1020523 and RET

Creator:: Liston, Aaron, Cronn, Richard, and Ashman, Tia-Lynn
Abstract:: The cultivated strawberry, Fragaria Xananassa, is one of the youngest domesticated plants. Its 18th century origin via hybridization in Europe between the North American F. virginiana and the South American F. chiloensis was documented by the botanist Antoine Nicolas Duchesne. His 1766 “Natural History of Strawberries” is an extraordinary work...
Resource Type:: Article
Full Text:: research is supported by the National Science Foundation (DEB 1020523 and DEB 1241006 to T.L.A., DEB

Creator:: Tennessen, Jacob A., Govindarajulu, Rajanikanth, Liston, Aaron, and Ashman, Tia-Lynn
Abstract:: Gynodioecy is a sexual system wherein females coexist with hermaphrodites. It is of interest not only because male-sterile plants are advantageous in plant breeding but also because it can be a crucial step in the evolutionary transition to entirely separate sexes (dioecy) from a hermaphroditic ancestor. The gynodioecious diploid wild...
Resource Type:: Article
Full Text:: wk. This treatment was repeated up to two times. All plants were watered and protected from pests as

Creator:: Njuguna, Wambui, Liston, Aaron, Cronn, Richard, Ashman, Tia-Lynn, and Bassil, Nahla
Abstract:: The cultivated strawberry is one of the youngest domesticated plants, developed in France in the 1700s from chance hybridization between two western hemisphere octoploid species. However, little is known about the evolution of the species that gave rise to this important fruit crop. Phylogenetic analysis of chloroplast genome sequences of...
Resource Type:: Article
Full Text:: subsp. bracteata was implicated as the diploid contributor to the octoploids, and this is corroborated

Creator:: Tennessen, Jacob A., Govindarajulu, Rajanikanth, Ashman, Tia-Lynn, and Liston, Aaron
Abstract:: Whole-genome duplications are radical evolutionary events that have driven speciation and adaptation in many taxa. Higher-order polyploids have complex histories often including interspecific hybridization and dynamic genomic changes. This chromosomal reshuffling is poorly understood for most polyploid species, despite their evolutionary and agricultural importance, due to the challenge of distinguishing...
Full Text:: species, despite their evolutionary and agricultural importance, due to the challenge of distinguishing

Creator:: Ashman, Tia-Lynn, Tennessen, Jacob A., Dalton, Rebecca M., Govindarajulu, Rajanikanth, Koski, Matthew H., and Liston, Aaron
Abstract:: Gynodioecy, the coexistence of females and hermaphrodites, occurs in 20% of angiosperm families and often enables transitions between hermaphroditism and dioecy. Clarifying mechanisms of sex determination in gynodioecious species can thus illuminate sexual system evolution. Genetic determination of gynodioecy, however, can be complex and is not fully characterized in any...
Resource Type:: Article
Full Text:: Tennessen et al. (2014). This map was created using OneMap (Margarido et al. 2007) and the 1825 polymorphic

Creator:: Govindarajulu, Rajanikanth, Liston, Aaron, and Ashman, Tia-Lynn
Abstract:: We studied the natural hybrid (Fragaria ×ananassa subsp. cuneifolia) between two sexually dimorphic octoploid strawberry species (F. virginiana and F. chiloensis) to gain insight into the dynamics of sex chromosomes and the genesis of sexual dimorphism. Male sterility is dominant in both the parental species and thus will be inherited...
Full Text:: discussion. This work was supported by the National Science Foundation 667 [DEB 1020523] to TLA and AL [DEB

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