Winteraceae (3, 7) including several species of Bubbia (5). Leroy illustrated what is labeled as a dorsal view of the gynoecium [figure lB of (1)]. In the absence of developmental studies it would seem impossible to determine the morphologically dorsal side of such a structure in the center of the flower. If the gynoecium is in fact unicarpellate, then by analogy with other Winteraceae, the fig...

Plants are unique in their ability to continuously produce new meristems and organ primordia. In Arabidopsis, the transcription factor LEAFY (LFY) functions as a master regulator of a gene network that is important for floral meristem and organ specification. UNUSUAL FLORAL ORGANS (UFO) is a co-activator of LEAFY and is required for proper activation of APETALA3 in the floral meristem during th...

I examined patterns of covariation of three morphometric blossom characters [gland area (GA), gland-stigma distance (GSD), and bract length (BL)] within genets, among genets, and among populations of the tropical vine, Dalechampia scandens (Euphorbiaceae). Covariance between BL and GA was evenly distributed among the three levels. This observation, coupled with developmental information, indica...

Geometry changes, especially surface expansion, accompanying flower primordium formation are investigated at the reproductive shoot apex of Arabidopsis with the aid of a non-invasive replica method and a 3-D reconstruction algorithm. The observed changes are characteristic enough to differentiate the early development of flower primordium in Arabidopsis into distinct stages. Primordium formatio...

Pedicularis section Cyathophora is a monophyletic group characterized by perfoliate leaf and/or bract bases at each node. This section comprises four series, corresponding to four general corolla types of Pedicularis, i.e. toothless, toothed, beaked and long-tubed corollas. In this study, we aim to reconstruct a comprehensive phylogeny of section Cyathophora, and compare phylogenetic incongruen...

INTERNATIONAl. CONFERENCE ON BYSSINOSIS 81S study may have been due to the differences in dust concentrations for the different cottons. An accurate adjustment for these differences cannot be made because only two closely spaced points on the doseresponse curve for standard cotton dust were obtained, and it may not be accurate to assume a similar slope for the dose-response to closed boll cotto...

In contrast to eudicot flowers which typically exhibit sepals and petals at their periphery, the flowers of grasses are distinguished by the presence of characteristic outer organs. In place of sepals, grasses have evolved the lemma and the palea, two bract-like structures that partially or fully enclose the inner reproductive organs. With little morphological similarities to sepals, whether th...

Plant forms display a wide variety of architectures, depending on the number of lateral branches, internode elongation and phyllotaxy. These are in turn determined by the number, the position and the fate of the Axillary Meristems (AMs). Mutants that affect AM determination during the vegetative phase have been isolated in several model plants. Among these genes, the GRAS transcription factor L...

Petrorhagia nanteuilii (Burnat) P. W. Ball & Heywood (Caryophyllaceae), native to western Europe and North Africa an introduced or alien plant in South America, Australia, Japan, was newly found Gyeongsangnam-do, Korea. is clearly distinguished from other genera by a bract at the base of calyx, which differs Gypsophila L., commissures sepals, different Dianthus L. grows on slopes roadsides,...