G Wv

Bio: G Wv is an academic researcher. The author has contributed to research in topics: Browallia & Cestrum. The author has an hindex of 1, co-authored 1 publications receiving 79 citations.

A preliminary synopsis of salpiglossis and other cestreae (solanaceae ) 12

Abstract: The genera Browallia, Cestrum, Hunzikeria, Leptoglossis, Nicotiana, Nierembergia, Petunia, Reyesia, and Salpiglossis, all members of the mainly Neotropical tribe Cestreae of the Solanaceae, are reviewed and generic lines are discussed. Hunzikeria, Leptoglossis, Reyesia, and Salpiglossis are given extensive attention, and a new species of Hunzikeria is described. Bouchetia is placed into synonymy under Salpiglossis. An evolutionary path from primitive ancestors to modern, advanced members of the group is postulated. Several genera of Solanaceae in tribe Cestreae have long been subject to confusion, and this paper suggests resolution of some of the problems. The names Bouchetia, Browallia, Cestrum, Hunzikeria, Leptoglossis, Nicotiana, Nierembergia, Petunia, Reyesia, and Salpiglossis are reviewed. The plants are mostly herbs or diminutive shrubs, and they occur in North and South America, some genera being disjunct. Although the study has spanned five years, this paper must be regarded as a report of unconcluded work rather than a completed investigation. Few living plants were seen and the herbarium survey was not exhaustive. In particular, species limits require definition. As the early emphasis was on North American species, these species receive more detailed treatment than those of South America.

A molecular phylogeny of the Solanaceae

Abstract: A phylogeny of Solanaceae is presented based on the chloroplast DNA regions ndhF and trnLF. With 89 genera and 190 species included, this represents a nearly comprehensive genus-level sampling and provides a framework phylogeny for the entire family that helps integrate many previously-published phylogenetic studies within Solanaceae. The four genera comprising the family Goetzeaceae and the monotypic families Duckeodendraceae, Nolanaceae, and Sclerophylaceae, often recognized in traditional classifications, are shown to be included in Solanaceae. The current results corroborate previous studies that identify a monophyletic subfamily Solanoideae and the more inclusive "x = 12" clade, which includes Nicotiana and the Australian tribe Anthocercideae. These results also provide greater resolution among lineages within Solanoideae, confirming Jaltomata as sister to Solanum and identifying a clade comprised primarily of tribes Capsiceae (Capsicum and Lycianthes) and Physaleae. Stronger evidence also is provided for the inclusion of Capsicum within a paraphyletic Lycianthes. Solanaceae are a predominantly New World group, with several lineages represented on other continents. Apart from events within Solanum (for which sampling in this study is inadequate for biogeographic interpretations) the Old World representatives of Solanaceae can be accounted for by eight or nine dispersal events.

Pollination biology of Nierembergia ( Solanaceae )

Abstract: A morphological and anatomical description of the floral syndrome ofNierembergia is given, including a survey of the presence of elaiophores in most of its species, chromatography of the floral oils and observations on the pollinator behaviour. The principal pollinators areTapinotaspis spp. includingT. chalybaea which is endowed with oil collectors on the middle legs. Other exomalopsines (Lanthanomelissa andParatetrapedia) and centridines (Centris) also visitNierembergia for pollen and oil. Based on these observations and on a morphological study of the fertile parts, different pollination modes are recognized and the biogeography and evolution of the genus is discussed.

Floral diversity and evolution in the Solanaceae

Abstract: The flowers of members of the Solanaceae are usually viewed as radially symmetric, and those genera with bilaterally symmetric flowers as the exception. In fact, a wide range of floral form occurs in the Solanaceae, from some members of the genus Solanum with completely radially symmetric flowers, through genera with zygomorphic androecia such as Schultesianthus, to species of Scbizanthus with markedly zygomorphic flowers. Zygomorphy can occur in from one to all of the floral whorls, and members of the Solanaceae exhibit a bewildering variety of floral forms. The relationship between floral form and pollination syndrome has been assumed by many botanists to be driving the evolution of floral symmetry in the Solanaceae, but it is clear that a phylogenetic component to the distribution of flower shape diversity also exists. A close relationship with the Convolvulaceae has led botanists to assume that zygomorphy is derived in the Solanaceae. Recent phylogenetic analyses, however, have shown that this is not the case; genera with markedly zygomorphic flowers occupy basal positions in the tree. In addition to variation in symmetry between genera, floral zygomorphy has clearly evolved several times in several of the larger genera of the family (e.g. Solanum, Cestrum, Nicotiana). The scope of floral form diversity in the Solanaceae is reviewed in light of current phylogenetic treatments of the family and of selected genera in the family. I also examine the potential for future developmental work on the evolution of floral form in the family, particularly in relation to taxa with potential as model organisms such as Petunia and Nicotiana, which are well understood at the genetic level. Finally, I examine the relationship between pollination and floral form, and propose ways of linking the study of genetics, development and the study of plants in their native habitats.

Cold-sensitive chromosome regions and heterochromatin in Cestrum aurantiacum ( Solanaceae )

Abstract: The karyotype ofCestrum aurantiacum was analyzed for the presence of coldsensitive regions (CSRs) and other types of constitutive heterochromatin. A range of techniques was employed including the fluorescent DAPI, chromomycin/DAPI double staining and actinomycin D/DAPI counter-staining, and the non-fluorescent C-banding applied as single or sequential staining, sequential N-banding and silver impregnation. Four classes of constitutive heterochromatin were recognized: CSRs, nucleolar organizers, non-nucleolar chromomycin-positive bands, and indifferently fluorescent bands. The banded karyotype ofC. aurantiacum is compared with those of otherCestrum species. The sectionsHabrothamnus andCestrum are not karyologically distinct.