Megaspore competition in F1 and F2 hybrids between Oenothera hookeri and Oe. suaveolens

Megasporogenesis and development of the embryo sac were investigated in F1 and F2 hybrids from crosses of Oe. hookeri and Oe. suaveolens. All hybrids form heteropolar and homopolar magaspore tetrads; the embryo sac, however, usually develops from the micropylar megaspore. Its development may occur i...

Full description

Saved in:
Bibliographic Details
Published inActa Societatis Botanicorum Poloniae Vol. 53; no. 3; pp. 317 - 324
Main Author Śnieżko, Renata
Format Journal Article
LanguageEnglish
Published Warsaw Polish Botanical Society 01.01.2014
Subjects
Competition
Degeneration
Genomes
hybrid Oenothera megasporogenesis
Hybrids
megaspore competition
Ovules
Tetrads
Online AccessGet full text

Cover

More Information
Summary:Megasporogenesis and development of the embryo sac were investigated in F1 and F2 hybrids from crosses of Oe. hookeri and Oe. suaveolens. All hybrids form heteropolar and homopolar magaspore tetrads; the embryo sac, however, usually develops from the micropylar megaspore. Its development may occur immediately after degeneration of three other megaspores or after a period of competition between both apical megaspores. They develop simultaneously for a relatively short time, after which the growth of the chalazal megaspore is inhibited, although the latter does not degenerate. The micropylar megaspore as a rule develops without disturbances into the embryo sac, but in some ovules it is formed from the chalazal megaspore or double ones arise from both apical megaspores of the tetrad. The frequency of the micropylar embryo sac formation seems to be dependent above all on the hybrid plant genome and not on the haploid genome of the megaspore.
ISSN:0001-6977
2083-9480
DOI:10.5586/asbp.1984.028