Abstract
A technique is described which permits the in vivo study of protein synthesis and phosphorylation in the pollen of Brassica spp. during the early stages of the pollen-stigma interaction. In Brassica napus and B. oleracea, compatible pollination is followed by a dramatic activation of protein synthesis in the pollen involving the synthesis of approximately 40 proteins. After incompatible pollinations in B. oleracea, virtually no newly synthesised polypeptides were detected in the pollen except for a small group of high molecular weight proteins which were not normally synthesised during compatible pollinations. Both compatible and incompatible pollinations were followed by the appearance of newly phosphorylated proteins in the pollen; these fell into four distinct groups. In B. oleracea, the number of phosphorylated proteins and the degree of phosphorylation of individual proteins within the four groups differed between compatible and incompatible pollinations. One group of phosphorylated proteins appeared to correspond with the small group of high molecular weight polypeptides which were synthesised in pollen after incompatible pollinations. These findings are discussed in the perspective of cell signalling during the pollen-stigma interaction in Brassica and also in terms of their possible implication in sporophytic self-incompatibility.
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Hiscock, S.J., Doughty, J. & Dickinson, H.G. Synthesis and phosphorylation of pollen proteins during the pollen-stigma interaction in self-compatible Brassica napus L. and self-incompatible Brassica oleracea L.. Sexual Plant Reprod 8, 345–353 (1995). https://doi.org/10.1007/BF00243202
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DOI: https://doi.org/10.1007/BF00243202