Variation in ribosomal DNA within and between populations of Isotoma petraea and Macrozamia riedlei

被引：6

作者：

Byrne M. ^{[1
,3
]}

Waycott M. ^{[3
]}

Hobbs A.A. ^{[2
]}

James S.H. ^{[3
]}

机构：

[1] Western Australian Herbarium, Dept. of Conserv. and Land Mgmt., Bentley Delivery Centre, Western Australia 6983

[2] Department of Biochemistry, University of Western Australia, Nedlands

[3] Department of Botany, University of Western Australia, Nedlands

来源：

Heredity | 1997年 / 79卷 / 6期

关键词：

Diversity; Isotoma petraea; Macrozamia riedlei; rDNA;

D O I：

10.1038/hdy.1997.202

中图分类号：

学科分类号：

摘要：

Restriction fragment length polymorphisms in ribosomal DNA were observed within and between populations of Isotoma petraea and Macrozamia riedlei. Isotoma petraea is a diploid self-pollinating species which has evolved complex hybridity in response to inbreeding and exhibits high levels of genetic differentiation between its geographically isolated populations. Macrozamia riedlei is a diploid dioecious wind-pollinated cycad with high levels of gene flow throughout its population system. Variation in rDNA was observed within and between populations of both species. In I. petraea the level of variation was low with most individuals having one length variant, except in populations with fixed hybridity, whereas in M. riedlei high levels of variation were observed with an average of eight variants per individual. The pattern of variation in I. petraea showed homogenization of length variants within individuals and populations with divergence of length variants between populations. The pattern of variation in M. riedlei showed mixing of length variants and maintenance of various length variants within individuals and populations. The different patterns of variation are consistent with the different breeding systems of the two species.

引用

页码：578 / 583

页数：5

共 24 条

[1]

Appels R., Dvorak J., The wheat ribosomal DNA spacer region, its structure and variation in populations and among species, Theor. Appl. Genet., 63, pp. 337-348, (1982)

[2]

Appels R., Honeycutt R.L., rDNA: Evolution over a billion years, DNA Systematics, 2, pp. 81-135, (1986)

[3]

Bellarosa R., Delre V., Schirone B., Maggini F., Ribosomal RNA genes in Quercus spp. (Fagaceae), Pl. Syst. Evol, 172, pp. 127-139, (1990)

[4]

Besse P., Seguin M., Lebrun P., Lanaud C., Ribosomal DNA variation in wild and cultivated rubber tree (Hevea brasiliensis), Genome, 36, pp. 1049-1057, (1993)

[5]

Bobola M.S., Eckhert R.T., Klein A.S., Restriction fragment variation in the nuclear ribosomal DNA repeat unit within and between Picea rubens and Picea mariana, Can. J. Forest Res., 22, pp. 255-263, (1992)

[6]

Byrne M., James S.H., Genetic diversity in the cycad Macrozamia riedlei, Heredity, 67, pp. 35-39, (1991)

[7]

Byrne M., Moran G.F., Tibbits W.N., Restriction map and maternal inheritance of chloroplast DNA in Eucalyptus nitens, J. Hered., 84, pp. 218-220, (1993)

[8]

Chalmers K.J., Waugh R., Watters J., Forster B.P., Nevo E., Abbott R.J., Powell W., Grain isozyme and ribosomal DNA variability in Hordeum spontaneum populations from Israel, Theor. Appl. Genet., 84, pp. 313-322, (1992)

[9]

Cluster P.D., Allard R.W., Evolution of ribosomal DNA (rDNA) genetic structure in colonial Californian populations of Avena barbata, Genetics, 139, pp. 941-954, (1995)

[10]

Dover G., Brown S., Coen E., Dallas J., Strachan T., Trick M., The dynamics of genome evolution and species differentiation, Genome Evolution, pp. 342-372, (1982)

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