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《植物学报(英文版)》 2003-01
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The Self-incompatibility (S) Locus of Antirrhinum Resides in a Pericentromeric Region

MA Wen-Shi, ZHOU Jun-Li, LAI Zhao, ZHANG Yan-Sheng, XUE Yong-Biao(Institute of Genetics and Developmental Biology, The Chinese Academy of Sciences, Beijing 100080, China)  
The self-incompatibility (S) loci from the Solanaceae, Rosaceae and Scrophulariaceae encode a class of ribonucleases, known as S RNases, which have been shown to control the pistil expression of self-incompatible reaction. In the former two families, the S loci have been shown to be located near centromere. However, the chromosomal location of the S locus in Antirrhinum, a species of the Scrophulariaceae, is not known. To determine its chromosomal location and genomic organization, an S2 RNase gene and its corresponding 63 kb BAC clone were separately used for fluorescence in situ hybridization (FISH) of mitotic metaphase chromosomes of a self-incompatible Antirrhinum line of S2S5. The results showed that the S2 RNase detected a doublet signal near the centromere of the smallest chromosome (2n = 16) . Two separate doublet signals of the tested BAG sequence were shown on both sides of the centromeres of all eight pairs of the chromosomes, suggesting that the Antirrhinum S locus is located in a pericentromeric region. Furthermore, a retrotransposon, named RIS1 (retrotransposon in the S locus) , which has not been identified yet in Antirrhinum, was found next to ,S2 RNase. Taken together, the centromeric location of the 5 locus from the three S-RNase-based self-incompatible families provides a further support on a common origin of their evolution as well as suppressed recombination.
【Fund】: 中国科学院和国家自然科学基金(39825103)~~
【CateGory Index】: Q945.5
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