Molecular analysis of the maize wx-B3 allele indicates that precise excision of the transposable Ac element is rare

Article Abstract:

The transposable activator (Ac) element of maize wx-B3 was analyzed and compared to other Ac elements. Wx-B3 Ac element and other active Ac elements were identical in structures and shared the same ability to transpose from Wx gene or to activate a Ds element. Excision of Ac element from the Wx gene inactivated the gene and resulted in production of null elements. Analysis of genetic and physical maps with the position of the gene mutation implied that Ac insertion was the sole lesion of wx-B3. The rarity of Ac excision was suggested to be correlated with the rarity of revertant sectors and pollen grains.

Translocation (Genetics), Plant cytogenetics

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The Ac and Uq transposable element systems in maize: interactions among components

Article Abstract:

The interactions between the members of the Ac and Uq transposable element systems in maize were studied through extensive crosses of members of the Uq-ruq and Ac-Ds families of elements. The results showed that the Uq element could elicit a mutable response only with alleles carrying either a ruq or a Ds1 insert. In contrast, The Ac regulatory elements could transactivate all classes of Ds receptor elements. These results show that the Ac and Uq transposable element systems overlap, and there is a nonreciprocating interaction between the components of the two systems.

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Molecular evolution of the Ac/Ds transposable-element family in pearl millet and other grasses

Article Abstract:

Sequence relationship between an Ac-like sequences from pearl millet and the grass species Bambusa multiplex reveals that the Ac/Ds transposable-element belongs to an ancient family. Both the Ac-like sequences are identical, indicating that the Ac/Ds transposable-element family is part of the grass family from the origin. The heterogeneity in pair-wise distance comparison between the two species may arise from differential selection or ectopic exchange between nonidentical transposable element homologues.

Evolution (Biology), Evolution, Grasses, Pearl millet

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