BACKGROUND AND AIMS Small populations of rare plant species are increasingly reported to have high levels of reproductive failure. The objective of this study was to understand the principal constraints on sexual reproduction in small fragmented populations of a rare clonal self-incompatible plant. METHODS The pollinator spectrum, diversity of flower colour, natural pollination and fruit-set ...

After landing on a wet stigma, pollen grains hydrate and germination generally occurs. However, there is no certainty of the pollen tube growth through the style to reach the ovary. The pistil is a gatekeeper that evolved in many species to recognize and reject the self-pollen, avoiding endogamy and encouraging cross-pollination. However, recognition is a complex process, and specific factors a...

opening frontiers has led in the last two decades to a massive migration of romanians to spain and italy, two countries known to have large areas planted with olives. romania owns large areas planted with ash forests. because of cross-reactivity between these two trees belonging to the oleaceae family and the big allergenic potential of olive pollens, after a number of years of residence in the...

Several neotropical orchid genera have been proposed as being sexually deceptive; however, this has been carefully tested in only a few cases. The genus Telipogon has long been assumed to be pollinated by male tachinid flies during pseudocopulatory events but no detailed confirmatory reports are available. Here, we have used an array of methods to elucidate the pollination mechanism in Telipogo...

In this study the artificial pollination of pistachio was investigated. Two types of pollen of local selective genotypes (Q1 and Q2) which were different pollinizers were used. The experiment had six treatments. Qazvini and Ohadi cultivars were pollinated with supplementary pollinations as treatment which was covered with cotton bag, natural pollination as a control which was not covered and tw...

Abstract Orchidaceae, one of the most numerous families in world's flora, have evolved various pollination strategies to favour cross-pollination, such as deceptive and pollinarium reconfiguration. Among terrestrial orchids Mediterranean, only species belonging genus Serapias show a strategy defined shelter imitation. The floral elements form tubular structure that insects use during their rest...