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PLANT PHYSIOLOGY , Vol 110, Issue 4 1231-1237, Copyright © 1996 by American Society of Plant Biologists

GENE REGULATION AND MOLECULAR GENETICS

Molecular Characterization of Two Brassica napus Pollen-Expressed Genes Encoding Putative Arabinogalactan Proteins

J. Gerster, S. Allard and L. S. Robert
Plant Research Centre, Central Experimental Farm, Ottawa, Ontario, Canada K1A 0C6

Two highly homologous cDNA clones, Sta 39-3 and Sta 39-4, corresponding to mRNAs highly expressed in Brassica napus cv Wester stamens were isolated by differential screening and characterized. Northern blot and in situ analyses demonstrated that Sta 39-3 and Sta 39-4 transcripts accumulate in pollen following the first pollen mitosis and are abundant at pollen maturity, thus identifying them as "late" pollen genes. Sta 39-3 and Sta 39-4 belong to a small gene family. Their predicted proteins share similarities with those deduced from recently isolated cDNAs encoding arabinogalactan proteins, which include a similar molecular mass (approximately 13 kD); high levels of alanine, proline, serine, and threonine, which are interspersed throughout the protein with no obvious repetitive motif; low levels of cysteine, histidine, tryptophan, and tyrosine; and hydrophobic N- and C-terminal ends. The Sta 39-3 and Sta 39-4 proteins may play a role in pollen germination and tube growth.


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