Search results for "Flore"

Influence de la qualité biochimique des résidus végétaux sur les processus de minéralisation et les communautés bactériennes impliquées

2009

Sex ratio and spatial distribution of male and female Antennaria dioica (Asteraceae) plants

2011

Sex ratio, sex spatial distribution and sexual dimorphism in reproduction and arbuscular mycorrhizal colonisation were investigated in the dioecious clonal plant Antennaria dioica (Asteraceae). Plants were monitored for five consecutive years in six study plots in Oulanka, northern Finland. Sex ratio, spatial distribution of sexes, flowering frequency, number of floral shoots and the number and weight of inflorescences were recorded. In addition, intensity of mycorrhizal fungi in the roots was assessed. Both sexes flowered each year with a similar frequency, but the overall genet sex ratio was strongly female-biased. The bivariate Ripley’s analysis of the sex distribution showed that within…

Ucriol, an epoxy-diterpene from Sideritis syriaca

1983

Abstract The isolation of a new epoxy-diterpene from the inflorescence of Sideritis syriaca (S. sicula Ucria) is described. Its structure and stereochemistry were established by spectroscopy and partial synthesis.

The pollination syndrome ofDeplanchea tetraphylla (Bignoniaceae)

1986

The reproductive structures ofDeplanchea tetraphylla (Bignoniaceae) exhibit a significant number of unusual features: inflorescence with an apical “platform”; flowers yellow, short-tubed, strongly zygomorphic; mouth closed through lateral compression; stamens and style long-exserted, erect or slightly reclined; nectar dark brown, exposed in the spoon-shaped lowermost corolla lobe and apparently acting also as a visual cue. These features suggest a highly elaborate syndrome for bird pollination: the birds (probably lorikeets) perch on the inflorescence platform and bend downwards to take up the exposed nectar, thus touching the exserted anthers and stigmas with the throat or breast. The like…

EFFECTS OF DIFFERENT FERTILIZATION LEVELS ON IBERIS SEMPERFLORENS POT CULTURE

2013

The genus Iberis (family Brassicaceae) includes 30 species of annual and perennial herbs and subshrubs that grow in a wide area from western and central Europe to the Mediterranean Basin. IberissemperflorensL. is a perennial evergreen subshrub (30-60 cm high) endemic to southern Italy and Sicily. Due to its abundance of white flowers and extensive flowering period occurring during the winter months, the species has good potential for pot cultivation and outdoor ornamental use in Mediterranean-type climates. Reliable and efficient propagation methods for I. semperflorens nursery production have been determined. However, there are limited information on cultural techniques of this winter flow…

I RUSTICA MUNERA DI CORIDONE (A MARGINE DI VERG., ECL. 2, 45-55)

2022

Within the second Eclogue, the rustica munera offered by Corydon to Alexis (vv. 45-55), while obeying a somewhat conventional plot, reveal a complex intertextual stratigraphy. Unexpectedly, δωροφόροι of di vine rank join the shepherd in paying homage to the ephebe, bringing bas kets full of lilies and a garland of flowers and herbs, to which fruits and branches of laurel and myrtle will be added. The tradition of the rubrics of στεφανωτικὰ ἄνθη, testified by Athenaeus in the 15th book of the Deipno sophistae, allows us to test both the rate of conventionality of the entire ecphrasis, and the variations made by Vergil to the lists of flowers and herbs, as well as Greek poetry as well as genr…

Physiological and reproductive differences between hermaphrodites and males in the androdioecious plant Fraxinus ornus

2004

8 páginas, 4 figuras, 1 tabla.

2014

Morphogenesis in plants is usually reconstructed by scanning electron microscopy and histology of meristematic structures. These techniques are destructive and require many samples to obtain a consecutive series of states. Unfortunately, using this methodology the absolute timing of growth and complete relative initiation of organs remain obscure. To overcome this limitation, an in vivo observational method based on Epi-Illumination Light Microscopy (ELM) was developed and tested with a male inflorescence meristem (floral unit) of the handkerchief tree Davidia involucrata Baill. (Nyssaceae). We asked whether the most basal flowers of this floral unit arise in a basipetal sequence or, altern…

Micropropagation from inflorescence stems of the Spanish endemic plant Centaurea paui Loscos ex Willk. (Compositae)

1999

Tissue culture techniques have been established as a useful approach for ex situ conservation of rare, endemic or threatened plant species. This report describes the micropropagation of Centaurea paui Loscos ex Willk (Compositae), an extremely endangered plant species endemic to the Valencia Community (eastern Spain), as a conservation measure which does not cause damage to the wild plants used as explant source. Inflorescence nodal segments of C. paui were selected as explants for in vitro establishment. The best rate of shoot proliferation was obtained on Murashige and Skoog (MS) mineral medium supplemented with 0.5 mg/l 6-benzyladenine or with 2 mg/l kinetin. Maximum shoot elongation was…

The Historiae Florentini populi by Poggio Bracciolini. Genesis and Fortune of an Alternative History of Florence

2020

During the last years of his life, Poggio Bracciolini (1380-1459), former Apostolic Secretary and Chancellor of Florence, was working on a long text that he characterized, in a letter written in 1458, as lacking a well-defined structure. This was most probably his history of the people of Florence (Historiae Florentini populi, the title given in Jacopo’s dedication copy to Frederick of Montefeltro, Duke of Urbino), revised and published posthumously by Poggio’s son, Jacopo Bracciolini (1442-1478). Contrary to what is often assumed, Poggio’s treatise was not a continuation, nor even a complement, to Leonardo Bruni’s (1370-1444) official history of Florence. It concentrates on the most recent…