ISSN:
1615-6110
Keywords:
Angiosperms
;
Onagraceae
;
Oenothera hookeri
;
Oe. biennis
;
Oe. suaveolens
;
Megaspore tetrads
;
inheritance of polarity of embryo sac development
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract In the F2-progeny of hybrids from crosses betweenOenothera biennis orsuaveolens andOe. hookeri with theRenner-complexesalbicans andhhookeri, the development of callose pattern in meiocytes and megaspore tetrads is the same as in the F1 and the parentOe. hookeri. During the development of the megaspore tetrads and the embryo sacs primary and secondary heteropolarity as well as homopolarity is observed. Estimates for the initial frequency of homo- and heteropolar tetrads at the end of the degeneration of megaspores in the tetrads immediately before the start of embryo sac development could be calculated. The F2-plants can be arranged in three groups, distinguished by the frequency of the two polarity types. One of these groups behaves similar to the parentOe. hookeri, the two others have more homopolar tetrads. The segregation can be interpreted as recombination of genes, which influence the development of the polarity in the ovules. This is possible by crossing-over of genes between the twoRenner-complexes of the hybrid.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00984870
