Molecular and cytological analyses of Deschampsia cespitosa populations from Northern Ontario (Canada)

被引：22

作者：

Nkongolo, KK ^{[1
]}

Deck, A ^{[1
]}

Michael, P ^{[1
]}

机构：

[1] Laurentian Univ, Dept Biol Sci, Sudbury, ON P3E 2C6, Canada

来源：

GENOME | 2001年 / 44卷 / 05期

关键词：

Deschampsia; RAPD; genetic relationships; species-specific markers; population-specific markers;

D O I：

10.1139/gen-44-5-818

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

Deschampsia cespitosa is widely dispersed around the globe, particularly in the northern hemisphere. A high tolerance to adverse environmental conditions allows D. cespitosa to colonize and dominate plots of land that are uninhabitable by other plants. The main objective of the present study was to determine the degree of genetic variation and relatedness among D. cespitosa populations from heavy metal contaminated sites and uncontaminated sites in Northern Ontario, using RAPD markers. Genomic DNA samples from individual plants were analyzed using 35 oligonucleotides of random sequence. Twenty-eight of these primers allowed amplification of random polymorphic DNA (RAPD) loci. Overall, 90% of RAPD bands were polymorphic. Analysis of molecular variance revealed that 72% of the variation could be attributed to individual differences within each of the populations. The within- and among-region variations accounted for 14 and 15% of the total molecular variance, respectively. Population-specific RAPD markers were identified. RAPD markers specific to D. cespitosa were isolated, cloned, and characterized. Cytogenetic analysis revealed a high level of aneuploidy in all the populations from Northern Ontario, with chromosome numbers varying from 2n = 18 to 2n = 26.

引用

页码：818 / 825

页数：8

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