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Discerning Friend From Foe: Systematic Revision Of Cuscuta L. Section Indecorae Using A Combined Ecological, Morphometric, And Phylogenetic Approach., Corey Burt
Theses and Dissertations (Comprehensive)
The genus Cuscuta (Dodder; Convolvulaceae) are obligate parasitic plants. In one clade known as section Indecorae, there are species which are considered pests that pose significant threats to agricultural crop production, while other species are rare or known only from historical records. Section Indecorae contains three species: C. coryli, C. warneri, and C. indecora (the latter with three infraspecific taxa: var. indecora, var. longisepala, and var. attenuata). The systematics of section Indecorae are not currently resolved. Cuscuta indecora has a long and complicated taxonomic history with many infraspecific varieties described, and …
Diversity And Evolution Of Inflorescences In Cuscuta, Morgan Glofcheskie
Diversity And Evolution Of Inflorescences In Cuscuta, Morgan Glofcheskie
Theses and Dissertations (Comprehensive)
Cuscuta (dodder) includes ca. 200 species of plant obligate stem parasites with both ecological and economical significance. Inflorescences have been historically used in Cuscuta for species descriptions and identification keys, but no comprehensive study exists to date. The main objective of this study was to survey the diversity of inflorescences, and to understand their evolution and possible form-function relationships. The inflorescence architecture of 132 Cuscuta taxa was analyzed using herbarium specimens, and eight species were grown to study their inflorescence development. Inflorescence traits were mapped into a genus phylogeny obtained from a combined analysis of nuclear ITS and plastid trnL-F …
Comparative Study Of Factors Influencing Seed Germination And Seedling Longevity In Cuscuta (Dodder, Convolvulaceae), Behrang Behdarvandi
Comparative Study Of Factors Influencing Seed Germination And Seedling Longevity In Cuscuta (Dodder, Convolvulaceae), Behrang Behdarvandi
Theses and Dissertations (Comprehensive)
Cuscuta (dodder), the only parasitic genus of Convolvulaceae family, is a significant plant from ecological, economical, and conservational point of views. The genus consists of c. 200 described species with wide ranges of ecological distributions. Cuscuta spp. are categorized as stem parasitic plants with reduced (or lost) photosynthesis-related genes. The filamentous coiled embryo, embedded in the endosperm, lacks cotyledons and is covered with a multiple-layered seed coat. The seedlings carry a vestigial root-like organ which is not considered a ‘true’ functional root. Members of the genus differ in their germination rate and seedling survival. It is known that seed …
Diversity And Evolution Of The Multicellular Protuberances In Cuscuta (Convolvulaceae) And The Function Of The Stomatiferous Protuberances In Cuscuta Subgenus Grammica, Courtney J. Clayson
Diversity And Evolution Of The Multicellular Protuberances In Cuscuta (Convolvulaceae) And The Function Of The Stomatiferous Protuberances In Cuscuta Subgenus Grammica, Courtney J. Clayson
Theses and Dissertations (Comprehensive)
Cuscuta (Convolvulaceae), also known as the dodders, is a holoparasitic genus comprised of ca. 200 species grouped into four subgenera: Monogynella, Cuscuta, Pachystigma, and Grammica. The presence of unique multicellular structures, referred to as stomatiferous protuberances (SPs), was reported on the stems of subgenus Grammica over a century ago and was forgotten until similar SPs were observed on the flowers of several new Grammica species. The stems and flowers were examined in 136 Cuscuta taxa, and SPs were discovered on all of the haustorial stems of the species in the subgenus Grammica, as well as …