Authors: Xingguo Zhang Dongmei Yin Chaozhi Ma Tingdong Fu
Publish Date: 2010/09/14
Volume: 29, Issue: 2, Pages: 481-488
Abstract
Selfincompatibility SI is reported to play a key role in the evolution of species as it promotes their outcrossing through the recognition and rejection of selfpollen grains In Brassica two Slocus genes expressed in the stigma Slocus glycoprotein SLG gene and Slocus receptor kinase SRK gene and one expressed in the pollen Slocus protein 11 SP11 gene were linked as an S haplotype In order to analyze the evolutionary relationships of S haplotypes in Brassica a total of 39 SRK 37 SLG and 58 SP11 sequences of Brassica oleracea Brassica rapa and Brassica napus were aligned Two phylogenetic trees with similar pattern were constructed based on the nucleotide sequences of SRK/SLG and SP11 respectively Class I and class II alleles were clustered into two distinct groups and alleles from different species including all the interspecific pairs of S haplotypes were closely related to each other The Slocus genes identified in B napus were intermingled in phylogenetic trees All these observations showed that class I and class II S haplotypes diverged ahead of the species differentiation in Brassica The evolution and the genetic diversity of S haplotypes in Brassica were discussed Moreover the relationships between S haplotypes and SI phenotypes in Brassica especially in B napus were also discussed
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