Stigmatic Receptivity Limits the Effective Pollination Period in `Agua de Aranjuez' Pear

Asynchronous development of stigmatic receptivity in the pear (Pyrus communis; Rosaceae) flower.

While stigma anatomy is well documented for a good number of species, little information is available on the acquisition and cessation of stigmatic receptivity. The aim of this work is to characterize the development of stigma receptivity, from anthesis to stigma degeneration, in the pentacarpellar pear (Pyrus communis) flower. Stigma development and stigmatic receptivity were monitored over tw...

Histological and Micro-CT Evidence of Stigmatic Rostellum Receptivity Promoting Auto-Pollination in the Madagascan Orchid Bulbophyllum bicoloratum

BACKGROUND The rostellum, a projecting part of the gynostemium in orchid flowers, separates the anther(s) from the stigma and thus commonly prevents auto-pollination. Nonetheless, as a modified (usually distal) portion of the median stigma lobe, the rostellum has been frequently invoked of having re-gained a stigmatic function in rare cases of orchid auto-pollination. Here it is shown that a ne...

Effects of aminoethoxyvinylgly-cine on the effective pollination period of apple

Effective pollination period for ‘Manzanillo’ and ‘Picual’ olive trees

The effective pollination periods (EPP) for ‘Manzanillo’ and ‘Picual’ olive trees have been determined in two consecutive years in irrigated orchards in California and Spain. The duration of the EPP was variable between year and cultivar. Fruit set declined gradually in response to sequential cross-pollination. Consistent differences with respect to the maximum levels of initial fruit set occur...

Arabinogalactan-protein secretion is associated with the acquisition of stigmatic receptivity in the apple flower

BACKGROUND AND AIMS Stigmatic receptivity plays a clear role in pollination dynamics; however, little is known about the factors that confer to a stigma the competence to be receptive for the germination of pollen grains. In this work, a developmental approach is used to evaluate the acquisition of stigmatic receptivity and its relationship with a possible change in arabinogalactan-proteins (AG...