S-RNase uptake by compatible pollen tubes in gametophytic self-incompatibility

Doan-Trung Luu, Xike Qin, David Morse and Mario Cappadocia ()
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Doan-Trung Luu: University of Montreal
Xike Qin: University of Montreal
David Morse: University of Montreal
Mario Cappadocia: University of Montreal

Nature, 2000, vol. 407, issue 6804, 649-651

Abstract: Abstract Many flowering plants avoid inbreeding through a genetic mechanism termed self-incompatibility. An extremely polymorphic S-locus1 controls the gametophytic self-incompatibility system that causes pollen rejection (that is, active arrest of pollen tube growth inside the style) when an S-allele carried by haploid pollen matches one of the S-alleles present in the diploid style. The only known product of the S-locus is an S-RNase expressed in the mature style2. The pollen component to this cell–cell recognition system is unknown and current models3,4 propose that it either acts as a gatekeeper allowing only its cognate S-RNase to enter the pollen tube, or as an inhibitor of non-cognate S-RNases. In the latter case, all S-RNases are presumed to enter pollen tubes; thus, the two models make diametrically opposed predictions concerning the entry of S-RNases into compatible pollen. Here we use immunocytochemical labelling of pollen tubes growing in styles to show accumulation of an S-RNase in the cytoplasm of all pollen-tube haplotypes, thus providing experimental support for the inhibitor model.

Date: 2000
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DOI: 10.1038/35036623

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