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Figure 10.2 Model for the mechanism of S-RNase-based SI. Cross, S 2 -RNase is targeted for
degradation by the 26S proteosome via general interaction with SLF 1 through the (largely speculative)
steps illustrated. Self, S 1 -RNase interacts with SLF1 in an alternative S -specific manner that precludes
ubiquitination and leaves RNase activity intact to degrade pollen RNA and inhibit tube growth.
S-RNase that prevents ubiquitination of S-RNase, so leaving RNase activity intact
to inhibit pollen tube growth.
10.3
Gametophytic self-incompatability in the Papaveraceae
A second gametophytic SI system has been found in Papaver rhoeas L. (field poppy)
and is mechanistically distinct from that found in the families described above. In
this species, in contrast to the Solanaceae, inhibition of incompatible pollen occurs
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