ArticleChromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology2004
Activity of the En/Spm-like transposons in meiosis as a base for chromosome repatterning in a small, isolated, peripheral population of Aegilops speltoides Tausch.
Article in Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology, 2004. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 58 papers.
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58 citing papers in PubMed, 133 citations in OpenAlex.
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Authors and funding
3 authors at 2 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
Chromosomal repatterning is considered to be one of the main mechanisms for plant genome evolution. Here, we report the first cytogenetic evidence for the involvement of En/Spm transposons in ongoing chromosomal repatterning leading to the rise of new fertile genomic forms in a small, isolated, peripheral plant population. Cytogenetical screening of original individual plants of Aegilops speltoides Tausch. with different phenotypes revealed a wide spectrum of chromosomal abnormalities including extra chromosomes, chromosomal rearrangements, and variability in chromosomal position/number of 45S and 5S rDNA sites. Cytogenetic analysis of the dynamics of En/Spm transposons in meiosis indicates that: (i) this type of transposon is active during male gametogenesis; (ii) separately or in conjunction with rDNA they form clusters in the hot spots of large chromosomal rearrangements; (iii) appearance of at least part of the mobile rDNA sites in genome of Ae. speltoides are connected with meiotic activity of En/Spm transposons. PCR screening for the site-selected transposon insertions confirm the presence of combined fragments that consist partly of the sequence of En/Spm transposon and partly of 5S rDNA sequence.
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