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Asquini, E.; Gerdol, M.; Gasperini, D.; Igic, B.; Graziosi, G.; Pallavicini, A. S-RNase-like Sequences in Styles of Coffea (Rubiaceae). Evidence for S-RNase Based Gametophytic Self-Incompatibility? Trop Plant Biol 4, 237-249, (2011) DOI: 10.1007/s12042-011-9085-2
Although RNase-based self-incompatibility (SI)
is suspected to operate in a wide group of plant families, it has been
characterized as the molecular genetic basis of SI in only three
distantly related families, Solanaceae, Plantaginaceae, and Rosaceae,
all described over a decade ago. Previous studies found that
gametophytic SI, controlled by a multi-allelic S-locus, operates in the
coffee family (Rubiaceae). The molecular genetic basis of this mechanism
remains unknown, despite the immense importance of coffee as an
agricultural commodity. Here, we isolated ten sequences with features of
T2-S-type RNases from two Coffea species. While three of the sequences
were identified in both species and clearly do not appear to be S-locus
products, our data suggest that six sequences may be S-alleles in the
self-incompatible C. canephora, and one may be a relict in the
self-compatible C. arabica. We demonstrate that these sequences show
style-specific expression, display polymorphism in C. canephora, and
cluster with S-locus products in a phylogenetic analysis that includes
other plant families with RNase-based SI. Although our results are not
definitive, in part because the available plant materials were limited
and data patterns relatively complex, our results strongly hint that
RNase-based SI mechanism operates in the Rubiaceae family.