Table 1.
Family | Subfamily | Competitive interaction | Defects in SLF/SFB | Potential number of genes for pollen specificity | Proposed function of SLF/SFB |
---|---|---|---|---|---|
Rosaceae | Prunoideae | No* | SC† | Single | Protect self S-RNase from being degraded |
Rosaceae | Maloideae | Yes | Not reported | Multiple | Mediate degradation of non-self S-RNases |
Solanaceae | Yes | Not reported | Multiple | Mediate degradation of non-self S-RNases | |
Plantaginaceae | Yes | Not reported | Multiple | Mediate degradation of non-self S-RNases |
* Huang et al. (2008) reported the only case of competitive interaction in tetraploid Prunus pseudocerasus, but the breakdown of SI could have been caused by mutations in other SI-related genes (Tao and Iezzoni, 2010).
† SC (self-compatible) indicates breakdown of SI in pollen.