The subject of this review is considered under 2 main headings:(1) regulation and
expression of genes in the developing♂ gametophyte and (2) sperm cell biology. The first …

Self-incompatibility (SI) is one of the mechanisms that have evolved to encourage
outbreeding in flowering plants and is defined as “the inability of a fertile hermaphrodite …

Advances in plant cell molecular biology have considerably increased our understanding of
pollen-pistil barriers, particularly those operated by incompatibility mechanisms, and, at the …

THE protein kinase family of enzymes mediates the responses of eukaryotic cells to both
inter-and intracellular signals1, 2. These enzymes are either serine/threonine-specific or …

Sequences of 11 alleles of the gametophytic self-incompatibility locus (S locus) from three
species of the Solanaceae family have recently been determined. Pairwise comparisons of …

We present a sequence comparison of 12 S-allele-associated proteins from three
solanaceous species with gametophytic self-incompatibility: Nicotiana alata, Petunia inflata …

Flower development is an area where the study of the processes of develop ment and of cell-
cell communication in plants can be nicely combined. The development of the flower …

In almond, gametophytic self-incompatibility is controlled by a single multiallelic locus (S-
locus). In styles, the products of S-alleles are ribonucleases, the S-RNases. Cultivated …

Self-incompatibility (SI) in angiosperms is a genetic mechanism that promotes outcrossing
through rejection of self-pollen. In the Solanaceae, SI is determined by a multiallelic S locus …

Gametophytic self-incompatibility in plants involves rejection of pollen when pistil and pollen
share the same allele at the S locus. This locus is highly multiallelic, but the mechanism by …