Abstract
The dry type stigma of Brassica is covered with a continuous layer of cuticle. Cutinase and non-specific esterases may be involved in breakdown of this cuticle barrier during pollen-stigma interaction, but only a little is known about their nature and characteristics. We report here the presence of two distinct esterases from stigma and pollen of Brassica. A 33 kD esterase assayed using MU-butyrate substrate shows high activity in stigma papillae. A similar esterase from Tropaeolum pollen has been shown to possess active cutinase activity. The esterase activity in anther tissue is due to a 24 kD enzyme with substrate specificity toward acetate esters. Both enzymes require sulfhydryl groups for their catalytic activity. Immunogold labelling of antibodies raised against these esterases localised the proteins at the subcellular level. Antibodies for MU-butyrate hydrolase gave a positive signal in the cell walls of mature stigma papillae and in the tapetum and microspores during early stages of anther development. In the mature anther, a positive signal in the cytoplasm of pollen grains with some detectable localisation in the exine layer of the pollen wall was obtained. Similar results were obtained with acetate hydrolase antibodies. These esterases are thus spatially and temporally regulated in stigma and anther tissues.
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Abbreviations
- MU :
-
methyl umbelliferyl
- pAbC :
-
anti-butyrate hydrolase polyclonal antibodies
- pAbE :
-
anti-acetate hydrolase polyclonal antibodies
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Lavithis, M., Bhalla, P.L. Esterases in pollen and stigma of Brassica . Sexual Plant Reprod 8, 289–298 (1995). https://doi.org/10.1007/BF00229386
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DOI: https://doi.org/10.1007/BF00229386