Existence of s-glycoprotein-like proteins in anthers of self-incompatible species of brassica

Masao Watanabe, Hideyuki Shiozawa, Akira Isogai, Akinori Suzuki, Takuji Takeuchi, Kokichi Hinata

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22 Citations (Scopus)


Experimental evidence is presented that there exists an anther protein that is reactive with a polyclonal antiserum raised against the stigma S-glycoprotein of the S8-homozygote of Brassica campestris. The antiserum did not react with extracts of seeds, ovaries or leaves. Since this antiserum did not react with the polysaccharide residues similar to those in S-glycoprotein, it was considered capable of identifying S-glycoprotein-like proteins in anthers (SA-protein: S-glycopro-tein-like anther protein). The SA-protein generated a single distinct band at a pI of about 5.0 on blots of gels after isoelectric focusing and three spots at 29 kDa and 83 kDa on blots of two-dimensional gels, which were different from those of stigma S-glycoprotein. The SA-protein did not contain polysaccharide residue that reacted with Con A. No allelic differences in pI were found for the SA-protein within a given species, while such differences are common in stigma S-glycoprotein. The SA-protein appeared in anthers at the uninucleate microspore stage which is much earlier than the stage at which the stigma S-xglycoprotein appears. It is present in anther walls rather than in the pollen of mature anthers. The SA-protein is considered to play an important role in sporophytic control of self-incompatibility.

Original languageEnglish
Pages (from-to)1039-1047
Number of pages9
JournalPlant and Cell Physiology
Issue number7
Publication statusPublished - 1991 Oct


  • Anther
  • Brassica campestris
  • S-glycoprotein
  • SA-protein
  • Self-incompatibility


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