In interspecific pollination of Brassica rapa stigmas with Brassica oleracea pollen grains, pollen tubes cannot penetrate stigma tissues. This trait, called interspecific incompatibility, is similar to self-incompatibility in pollen tube behaviors of rejected pollen grains. Since some B. rapa lines have no interspecific incompatibility, genetic analysis of interspecific incompatibility was performed using two F2 populations. Analysis with an F2 population between an interspecific-incompatible line and a self-compatible cultivar ‘Yellow sarson’ having non-functional alleles of S-locus genes and MLPK, the stigmas of which are compatible with B. oleracea pollen grains, revealed no involvement of the S locus and MLPK in the difference of their interspecific incompatibility phenotypes. In QTL analysis of the strength of interspecific incompatibility, three peaks of LOD scores were found, but their LOD scores were as high as the threshold value, and the variance explained by each QTL was small. QTL analysis using another F2 population derived from selected parents having the highest and lowest levels of interspecific incompatibility revealed five QTLs with high LOD scores, which did not correspond to those found in the former population. The QTL having the highest LOD score was found in linkage group A02. The effect of this QTL on interspecific incompatibility was confirmed by analyzing backcrossed progeny. Based on synteny of this QTL region with Arabidopsis thaliana chromosome 5, a possible candidate gene, which might be involved in interspecific incompatibility, is discussed.
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We are grateful to Dr. Kuginuki of Asahi Noen Seed Co. Ltd. for providing seeds of ‘Osome P11’ and ‘Harusakari P04’. This work was supported in part by a Grant-in-Aid for Scientific Research (A) (no. 19208001) from the Japan Society for the Promotion of Science (JSPS) and the Program for Promotion of Basic and Applied Researches for Innovations in Bio-oriented Industry (BRAIN).
Communicated by R. Visser.
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Udagawa, H., Ishimaru, Y., Li, F. et al. Genetic analysis of interspecific incompatibility in Brassica rapa . Theor Appl Genet 121, 689–696 (2010). https://doi.org/10.1007/s00122-010-1340-7
- Linkage Group
- Pollen Tube
- Doubled Haploid Line
- Interspecific Pollination
- Unilateral Incompatibility