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THE PLANT CELL, Vol 1, Issue 5 501-510, Copyright © 1989 by American Society of Plant Biologists
Inhibition of in Vitro Pollen Tube Growth by Isolated S-Glycoproteins of Nicotiana alata
W. Jahnen, W. M. Lush and A. E. Clarke
Plant Cell Biology Research Centre, School of Botany, University of Melbourne, Parkville, Victoria 3052, Australia
Pollen from three S-genotypes of Nicotiana alata was grown in vitro in the
presence of S-glycoproteins isolated from styles of the same three
genotypes. Pollen germination was not affected by the presence of the
S-glycoproteins, but pollen tube growth of all genotypes was inhibited. S2
pollen was preferentially inhibited by the S2-glycoprotein and S3 pollen by
the S3-glycoprotein. The S6-glycoprotein preferentially inhibited growth of
both S2 and S6 pollen over S3 pollen. Heat treatment dramatically increased
the inhibitory activity of the S-glycoproteins as inhibitors both of pollen
germination and tube growth; after heat treatment, S-allele specificity of
pollen tube inhibition was not detected.
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