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Gamete formation via meiotic nuclear restitution generates fertile amphiploid F1 (oat × maize) plants

Permanent URL:
http://handle.nal.usda.gov/10113/54504
Abstract:
Hybrid (oat × maize) zygotes developed into euhaploid plants with complete oat chromosome complements without maize chromosomes and into aneuhaploid plants with complete oat chromosome complements and different numbers of retained individual maize chromosomes. The elimination of maize chromosomes in the hybrid embryo is caused by uniparental genome loss during early steps of embryogenesis. Some of these haploid plants set seed in up to 50% of their self-pollinated spikelets. The high fertility was found to be mainly caused by formation of numerically unreduced female and male gametes (n unreduced = 3x + 0 … 3 = 21 … 24 chromosomes). Gamete formation involves meiotic nuclear restitution. The restitution process is caused by an alternative type of meiosis. It follows the model of levigatum-type semi-heterotypic divisions, but with a formation of the nuclear membrane at the transition from telophase I to interkinesis, which resembles the model of pygaera-type pseudo-homotypic divisions. We propose the name haploid meiotic restitution for this particular process combination. We discuss the use and implications of the specific process of gamete formation in F1 (oat × maize) plants.
Author(s):
R. G. Kynast , D. W. Davis , R. L. Phillips , H. W. Rines
Subject(s):
chromosome elimination , chromosome number , chromosomes , corn , embryogenesis , females , genome , germ cells , haploidy , hybrids , inflorescences , males , meiosis , models , nuclear membrane , oats , plants , seed set , telophase , zygote
Source:
Sexual plant reproduction 2012 6 v.25 no.2
Language:
English
Publisher:
Springer-Verlag
Year:
2012
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.