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Genetic variation of NBS-LRR class resistance genes in rice lines

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Genetic variation of NBS-LRR class resistance genes in rice lines

Auteurs : Sihai Yang [République populaire de Chine] ; Tingting Gu [République populaire de Chine] ; Chunyu Pan [République populaire de Chine] ; Zhumei Feng [République populaire de Chine] ; Jing Ding [République populaire de Chine] ; Yueyu Hang [République populaire de Chine] ; Jian-Qun Chen [République populaire de Chine] ; Dacheng Tian [République populaire de Chine]

Source :

Theoretical and Applied Genetics [ 0040-5752 ] ; 2008.

RBID : ISTEX:881FEB4CD463C8E360EE5A6CB9F539A93DEE8AEF

Abstract

Abstract: The use of plant disease resistance (R) genes in breeding programs needs an understanding of their variation patterns. In our current study, we investigated the polymorphisms of 44 NBS-LRR class R-genes among 21 rice cultivars and 14 wild rice populations. Our data suggested that there were four basic types of variations: conserved, diversified, intermediate-diversified, and present/absent patterns. Common characteristics at a locus of conserved R-genes were: copy-number uniformity, clear divergence (long branches) with other paralogs, and highly identical alleles. On the other hand, copy-number variability, a nearly equal and non-zero branch lengths, and high levels of nucleotide diversity were observed at the loci of highly diversified R-genes. Research suggests that the ratio of diverse alleles to the total number of genes at a locus is one of the best criteria to characterize the variation pattern of an R-gene. Our data suggested that a significant genetic reduction was detected only in four present/absent R-genes, compared with the variation observed in wild rice. In general, no difference was detected between wild rice and cultivars, japonica and indica rice, or between lines from different geographic regions. Our results also suggested that R-genes were under strong selection, which shaped R-gene variation patterns.

Url:

https://api.istex.fr/ark:/67375/VQC-1CVRVPNJ-9/fulltext.pdf

DOI: 10.1007/s00122-007-0656-4

Affiliations:

République populaire de Chine

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Abstract: The use of plant disease resistance (R) genes in breeding programs needs an understanding of their variation patterns. In our current study, we investigated the polymorphisms of 44 NBS-LRR class R-genes among 21 rice cultivars and 14 wild rice populations. Our data suggested that there were four basic types of variations: conserved, diversified, intermediate-diversified, and present/absent patterns. Common characteristics at a locus of conserved R-genes were: copy-number uniformity, clear divergence (long branches) with other paralogs, and highly identical alleles. On the other hand, copy-number variability, a nearly equal and non-zero branch lengths, and high levels of nucleotide diversity were observed at the loci of highly diversified R-genes. Research suggests that the ratio of diverse alleles to the total number of genes at a locus is one of the best criteria to characterize the variation pattern of an R-gene. Our data suggested that a significant genetic reduction was detected only in four present/absent R-genes, compared with the variation observed in wild rice. In general, no difference was detected between wild rice and cultivars, japonica and indica rice, or between lines from different geographic regions. Our results also suggested that R-genes were under strong selection, which shaped R-gene variation patterns.</div>
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Genetic variation of NBS-LRR class resistance genes in rice lines

Genetic variation of NBS-LRR class resistance genes in rice lines

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Abstract

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