The fate of ribosomal genes in three interspecific somatic hybrids of Medicago sativa: three different outcomes including the rapid amplification of new spacer-length variants

1996 ◽  
Vol 93-93 (5-6) ◽  
pp. 801-808 ◽  
Author(s):  
P. D. Cluster ◽  
O. Calderini ◽  
F. Pupilli ◽  
F. Crea ◽  
F. Damiani ◽  
...  
Keyword(s):  
Medicago Sativa ◽  
Somatic Hybrids ◽  
Ribosomal Genes ◽  
Spacer Length ◽  
Rapid Amplification ◽  
Interspecific Somatic Hybrids ◽  
Spacer Length Variants

Interspecific somatic hybrids between dihaploidSolanum tuberosumL. and the wild species,S. pinnatisectumDun

1994 ◽  
Vol 45 (10) ◽  
pp. 1433-1440 ◽  
Author(s):  
A.C. Ward ◽  
J.St-J Phelpstead ◽  
A.E. Gleadle ◽  
N.W. Blackhall ◽  
S. Cooper-Bland ◽  
...  
Keyword(s):  
Wild Species ◽  
Somatic Hybrids ◽  
Interspecific Somatic Hybrids

Molecular cloning and characterization of an unusually large intergenic spacer from the Nor-B2 locus of hexaploid wheat

Genome ◽  
1996 ◽  
Vol 39 (2) ◽  
pp. 288-292 ◽  
Author(s):  
R. K. Sardana ◽  
R. B. Flavell
Keyword(s):  
Key Words ◽  
Ribosomal Dna ◽  
Hexaploid Wheat ◽  
Organizer Region ◽  
Nucleolar Organizer Region ◽  
Intergenic Spacer ◽  
Nucleolar Organizer ◽  
Spacer Length ◽  
Spacer Length Variants

An allelic rDNA variant from the Nor-B2 locus of 'Bezostaya' wheat that forms an especially active nucleolus was cloned and characterized. It carries an unusually large intergenic spacer compared with rDNA units in most other wheat genotypes. The additional intergenic length is in the array of 135-bp A repeats and not in other internal repeats. These A repeats have sequences nearly identical to other A repeats described for other alleles. It is suggested therefore that the more active Nor-B2 locus of 'Bezostaya' may be due to the constituent rDNA units possessing a larger array of A repeats. Key words : ribosomal DNA, nucleolar organizer region, A and B repeats, allelic, spacer length variants.

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