Centromere orientation of quadrivalents of heterozygous translocations and an autoploid of Gossypium hirsutum L. [Cotton]

Cytological observations of quadrivalents of heterozygous translocations in Gossypium hirsutum L. demonstrate that, in addition to alternate-1 and alternate-2 orientations, a third alternate orientation (alternate-3), which occurs as a three-dimensional, V-type configuration, can be identified.-Two...

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Veröffentlicht in:Genetics (Austin) 1983-11, Vol.105 (3), p.723-731
Hauptverfasser: Endrizzi, J. E, Ray, D. T, Gathman, A. C
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Sprache:eng
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Zusammenfassung:Cytological observations of quadrivalents of heterozygous translocations in Gossypium hirsutum L. demonstrate that, in addition to alternate-1 and alternate-2 orientations, a third alternate orientation (alternate-3), which occurs as a three-dimensional, V-type configuration, can be identified.-Two additional types of disjunctions, the centromere orientations of which are rotational modifications of either adjacent or alternate configurations, were also observed in quadrivalents of a translocation heterozygote. These two types are rare, and both appear in the form of the Roman numeral X . The X and the alternate-3 types also occur in quadrivalents of an autoploid of G. hirsutum.-The two X types, along with adjacent-1, adjacent-2, alternate-1 and alternate-2 orientations, represent the six possible types of planar 2 x 2 random orientation of the four centromeres of a quadrivalent. Including the three-dimensional alternate-3 type, there are seven types of orientation.
ISSN:0016-6731
1943-2631
1943-2631
DOI:10.1093/genetics/105.3.723