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Wheat Information
Service
Number 82: 24-28 (1996)
A very
simple F2 progeny segregating ratio from genotype HS 131
in winter wheat, facultative apomixis
F.W. Zhao, H. X Li, Q. X Zhou, Z. Y. Ma, L.R. Bai, H. W. Li and W.
Li
Dry Farming Institute, Hebei Academy of Agricultural and Forestry
Sciences, Hengshui City, 053000, P. R. China
Summary
A five-year observation from progenies of three hybrid
combinations derived from genotype Hengshui 86-171-131 (HS 131),
a mutant selected
from Cobalt irradiated progeny, showed: (1) HS 131 possessed the
ability to produce uniform lines in its F3 generation
probably due to facultative apomictic reproduction.
(2) 62 segregating lines
out of 84 lines were
observed in its F3 progeny from the combination of HS 90-4-11/HS 131.
On the contrary,
another 22
lines were distinguished by
their morphological uniformity. (3) Characteristics of plant height
(PH), ear length (EL), number of florets per head (FL/H) and seeds
per head (S/H)
were recorded, and
their c.v's. were calculated and compared with the cheek variety,
Jimai 24.
For every line studied there
were no differences between them by means of t-test and true-breeding
lines could be obtained in its F3 generation, i.e.,
F2 generation can fix the hybrid heterosis. (4) The ratio
of segregating to uniform F3 lines was fit to
3 : 1 and
13 : 3
segregating models, but
better fit to 3 : 1.
It is suggested that there is only one pair of genes controlling the
facultative character based on Chi-square test. (5) The genotype HS
131 is probably a facultative apomictic mutant from this experiment
and demonstrated a very simple inheritance, which can be directly
used to wheat apomictic breeding.
Keywords:
Wheat, Facultative apomixis, Apomictic breeding
Introduction
Apomictic breeding, an old/new approach for fixing hybrid
heterosis, has been raised much interest among geneticists and
breeders in recent years. Much efforts have been paid to it during
which some good results have been obtained in the aspects of
theoretical as well as practical. The key point is to find the
apomictic gene(s) which can be used in the breeding research. Our
work over the past five years, has shown that the genotype HS 131
behaved like facultative apomictic based on the study of its progeny,
and the results are reported below.
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