Molecular and General Genetics MGG

, Volume 222, Issue 2–3, pp 241–248 | Cite as

A new class of S sequences defined by a pollen recessive self-incompatibility allele ofBrassica oleracea

  • Che-Hong Chen
  • June B. Nasrallah


Self-incompatibility inBrassica oleracea is controlled by a single genetic locus (the S locus) with nearly 50 different alleles. In this paper, we report the characterization of the S2 allele, a pollen recessive self-incompatibility allele that exhibits weak DNA homology to the other previously sequenced S locus glycoprotein genes (SLG-6, -13,-14, -22 from alleles S6, S13, S14 and S22, respectively). Stigma cDNA clones with sequence homology to SLG-13 were isolated from two different S2 homozygous strains belonging to two differentB. oleracea cultivars, var.alboglabra (Chinese kale) and var.italica (broccoli). The two S2 cDNA sequences are 90% homologous to each other, but only 70% homologous to SLG-13. Using the Chinese kale S2 genetic background, we demonstrate that the isolatedalboglabra cDNA sequence is a transcript from a gene, designated SLG-2A that resides at the S locus, and propose that it is a putative determinant of S2 allelic specificity. Among the estimated 10–15 genomic copies of SLG-related genes detected in the S2 genome, we cloned and characterized the SLG-2A gene and another closely related and genetically linked gene copy, SLG-2B. A complete open reading frame that is 94% homologous to SLG-2A is located within SLG-2B. The existence of this intact duplicated S gene raises the possibility that SLG-2B may also be involved in the functioning of self-incompatibility inBrassica oleracea.

Key words

Brassica oleracea Self-incompatibility S locus Allelic variation Gene duplication 


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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • Che-Hong Chen
    • 1
  • June B. Nasrallah
    • 1
  1. 1.Section of Plant BiologyCornell UniversityIthacaUSA

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