S-RNase-based gametophytic self-incompatibility (GSI) has evolved once before the split of the Asteridae and Rosidae. This conclusion is based on the phylogenetic history of the S-RNase that determines pistil specificity. In Rosaceae, molecular characterizations of Prunus species, and species from the tribe Pyreae (i.e., Malus, Pyrus, Sorbus) revealed different numbers of genes determining S-po...

For pollination to succeed, pollen must carry sperm through a variety of different floral tissues to access the ovules within the pistil. The pistil provides everything the pollen requires for success in this endeavor including distinct guidance cues and essential nutrients that allow the pollen tube to traverse enormous distances along a complex path to the unfertilized ovule. Although the pis...

Pollen–pistil interaction is a basic process in the reproductive biology of flowering plants and has been subject intense fundamental research that pronounced practical value. The phytohormones ethylene (ET) cytokinin (CK) together with other hormones such as auxin, gibberellin (GA), jasmonic acid (JA), abscisic (ABA), brassinosteroids (BRs) influence different stages plant development growth. ...

The olive crop has a large diversity in cultivars around the world, whose identification have been based on leaf, stem or fruit traits. However, these traits may be influenced by environment, which led to misidentification of cultivars. variability pistil and pollen structure under electron scanning light microscopy were studied using 'Arbequina', 'Arbosana', 'Frantoio', 'Koroneiki', 'Manzanill...

We have used a differential plaque hybridization screening procedure to isolate cDNA clones for genes that show elevated or exclusive expression in tomato pistils. Clones that showed maximal expression in immature pistils (premeiotic to early meiosis) and mature pistils (at anthesis) were isolated. Of nine clones that were characterized, four were found also to express at some stage of anther d...

Self-incompatibility allows plants to recognize and reject pollen from the same plant, thereby reducing inbreeding. Although in most cases self-incompatibility is controlled by a single genetic locus, recent results show that surprisingly complex signal transduction pathways and many players are involved in pollen recognition and rejection.

L’objectif de la présente recherche est déterminer dans quelle mesure l’effet fréquence du voisinage orthographique une tâche catégorisation couleur mots modifié lors vieillissement lorsque vitesse traitement des participants prise en compte. Deux conditions colorés ont été comparées couleurs réalisée par un groupe d’adultes jeunes (Mâge = 21,62) et âgés 66,04). La moitié ne possédaient pas voi...

..................................................................... iv ACKNOWLEDGEMENTS .................................................. vi LIST OF TABLES AND FIGURES ........................................ vii