The phenylpropanoid pathway gives rise to metabolites that determine floral colour and fragrance. These metabolites are one of the main means used by plants to attract pollinators, thereby ensuring plant survival. A lack of knowledge about factors regulating scent production has prevented the successful enhancement of volatile phenylpropanoid production in flowers. In this study, the Production...

The isolation barriers restricting gene flow between populations or species are of crucial interest for understanding how biological species arise and how they are maintained. Few studies have examined the entire range of possible isolation barriers from geographic isolation to next generation hybrid viability. Here, we present a detailed analysis of isolation barriers between two flowering pla...

Severa1 homeotic genes that are involved in floral differentiation have recently been isolated and characterized from Antirrhinum majus and Arabidopsis thaliana (Sommer et al., 1990; Yanofsky et al., 1990). Based on genetic and molecular studies, a model has been proposed to explain the roles of different homeotic genes in the specification of floral organ identity (Bowman et al., 1991). To see...

THE activity of phosphatase in the bean, potato, radish and wheat at different stages of their life histories was reported in a previous paper [Ignatieff & Wasteneys, 1936]. The small amounts of material available however made the investigation of the distribution of the enzyme in the various parts of the flower impossible. Such data are needed to complete our knowledge of the distribution of t...

Field performance of herbaceous annual plants is largely determined by plant architecture and flowering performance. A Petunia axillaris × P. exserta F7 recombinant inbred line population was grown in four field environments across the United States, phenotyped for seven habit flowering-related traits: height (Height), maximum (MaxWid) minimum (MinWid) width, vigor, compactness (Comp), canopy c...

Meloidogyne petuniae n. sp. is described and illustrated from specimens parasitic on petunia (Petunia hybrida L.) in Brasilia, Brazil. The perineal pattern of the female is elongate to ovoid with a high, squarish arch and widely spaced, coarse striae. The stylet of the female is 12.9-16.5 microm long and has three small, rounded knobs that are distinctly set off from the shaft. Each knob is mar...

Low temperature is a major adverse environmental factor that impairs petunia growth and development. To better understand the molecular mechanisms of cold stress adaptation of petunia plants, a quantitative proteomic analysis using iTRAQ technology was performed to detect the effects of cold stress on protein expression profiles in petunia seedlings which had been subjected to 2°C for 5 days. O...

Pepper yellow mosaic virus on Petunia hybrida, bean Viola odorata and Narcissus stripe cyclamineus were identified in Brazil using RT-PCR. Serology, mechanical transmission, host range, electron microscopy used to study the viruses further.

Maintenance of cytosine methylation in plants is controlled by three DNA methyltransferases. MET1 maintains CG methylation, and DRM1/2 and CMT3 act redundantly to enforce non-CG methylation. RPS, a repetitive hypermethylated DNA fragment from Petunia hybrida, attracts DNA methylation when transferred into Petunia or other species. In Arabidopsis thaliana, which does not contain any RPS homologu...