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Plant Rac‐like GTPases have been classified phylogenetically into two major groups—class I and class II. Several pollen‐expressed class I Rac‐like GTPases have been shown to be important regulators of polar pollen tube growth. The functional participation by some of the class I and all of...
Calcium ions (Ca 2+ ), protons (H + ), and borate (B(OH) 4 – ) are essential ions in the control of tip growth of pollen tubes. All three ions may interact with pectins, a major component of the expanding pollen tube cell wall. Ca 2+ is thought to bind acidic residues, and cross‐link adjacent...
Self‐incompatibility (SI) in Papaver rhoeas involves an allele‐specific recognition between stigmatic S‐proteins and pollen, resulting in inhibition of incompatible pollen. A picture of some of the signalling events and mechanisms involved in this specific inhibition of pollen tube growth...
During meiotic prophase, telomeres actively attach themselves to the nuclear envelope and cluster in an arrangement called the bouquet. The bouquet is unique to meiosis, highly conserved, and thought to facilitate homologous chromosome synapsis. Analy sis of three‐dimensional fluorescence in...
The class III pistil‐specific PELP proteins (PELPIII) of Nicotiana tabacum includes at least two members of highly soluble glycoproteins containing glucan modules that are characteristic for arabinogalactan proteins (AGPs). PELPIII accumulates in the style transmitting tissue (TT) during pistil...
Biochemical interactions between the pollen and the pistil allow plants fine control over fertilization. S‐RNase‐based pollen rejection is among the most widespread and best understood of these interactions. At least three plant families have S‐RNase‐based self‐incompatibility (SI)...
In most self‐incompatible plant species, recognition of self‐pollen is controlled by a single locus, termed the S ‐locus. In Brassica , genetic dissection of the S ‐locus has revealed the presence of three highly‐polymorphic genes: S ‐receptor kinase ( SRK ), S ‐locus protein 11 (...
The mechanisms of compatible pollination are less studied than those of incompatible pollination and yet most of the angiosperms show self‐compatibility. From the release of pollen from anthers to the penetration of the micropyle by the pollen tube tip, there are numerous steps where the...
The self‐incompatibility (SI) response in Papaver rhoeas depends upon the cognate interaction between a pollen‐expressed receptor and a stigmatically expressed ligand. The genes encoding these components are situated within the S ‐locus. In order for SI to be maintained, the genes encoded...
Senecio squalidus (Oxford Ragwort) is being used as a model species to study the genetics and molecular genetics of self‐incompatibility (SI) in the Asteraceae. S. squalidus has a strong system of sporophytic SI (SSI) and populations within the UK contain very few S alleles probably due to a...
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