Abstract
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) systems, and S‐RNases have also been implicated in interspecific pollen rejection. Although S‐RNases determine the specificity of SI, other genes are required for the pollen rejection system to function. Progress is being made toward identifying these non‐S‐RNase factors. HT‐protein, first identified as a non‐S‐RNase factor that was required for SI in Nicotiana alata, has now been implicated in other species as well. In addition, several pistil proteins bind to S‐RNase in vitro. One hypothesis is that S‐RNase forms a complex with these proteins in vivo that is the active form of S‐RNase in pollen rejection.
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