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PNL Volume 20
1988
RESEARCH REPORTS
39 |
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GENETICS OF EARLY FLOWERING
PEA MUTANTS
Uzhintseva, L. P. and
K. K. Sidorova Inst, of Cytology &
Genetics USSA Academy of
Sciences, Siberian Div., Novosibirsk, USSR
Early
flowering pea mutants (Table 1), which differ from the initial variety in a low node of the first flower,
date of flowering, and length of the vegetative period, were induced by
gamma rays (mutant 2), EMS (398, 400, 418, 578), NEU (319, 320, 320/1,
326), or NMU (629). In all mutants except 319, 320, and 326 a low node of
flower initiation correlates with early flowering as well as early
ripening. Two mutants (2 and 400) have a shorter vegetative period but higher seed
productivity than their initial varieties. Further details are given elsewhere
(4,5).
Table 1. Initial variety and
early flowering pea mutants. ___ |
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In crosses with initial varieties
and between themselves, in
order to determine their allelism, all mutants appeared to be monogenic
recessive mutations and to result from the mutation of different alleles of one locus (5).
The Lf locus is indicated since Murfet (3) has identtified cultivar 'Torsdag' as Lf and
mutants 2 and 519 as 1fa and lf, respectively.
This conclusion was confirmed by several crosses. A cross between mutant 2
and marker line NGB1238 segregated in a monohybrid ratio for node of the first flower
and the flowering gene showed linkage with marker A on chromosome 1. The
Lf locus shows close Linkage
with the A locus (1,6). In addition, the mutants were crossed with the
type lines for lfa (Hobart
line 7) and lf (Hobart line 58 = Nordic Gone Bank line 1792). The mutants
were also crossed with Hobart
lines 59 (lf) and 64 (lf), Vasileva's mutant XVIII/17 (obtained from the variety 'Wesna'), Wellensiek's M and E mutants (obtained
from the variety 'Dominant', and Gottschalk's mutant 46C
obtained from the variety 'Dippes Gelbe Vik-toria'). The last three mutant lines were
formed by mutatiions of the type Lfd to Lf, Lfd to lf,
and Lf to lfa, respectively (2). The results of the crosses indicated that all the
mutants and lines studied are allelic and appear to be
the result of mutations at the Lf locus; Group I mutants (2, 578, 398,
629, 418) have genotype lfa and Group II mutants (319, 320, 320/1, 326, 400) have genotype
lf. Under Siberian conditions mutants XVIII/17, 46C,
and Hobart line 7 formed their
first flower at nodes 5-7, mutant E and
Hobart lines 58 (NGB1792), 59, and 64 flowered at nodes 8-9, and mutant M
at nodes 11—14. All node counts commenced from the
first foliage leaf as node 1. Thus under Siberian conditions the four
alleles lfd,
Lf, lf, and lfa lead to the first flower forming at nodes 18-20,
11-14, 8-9, and 5-7, respectively.
We thank Dr. S. Blixt, Professor
W. Gottschalk, Dr. I. C. Murfet, Dr. M. Vasileva, and Professor S. J.
Wellensiek for providing
mutants and lines. |
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40
PNL Volume 20
1988 RESEARCH
REPORTS |
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1. Hoshino, Y. 1915. J. Coll. Agric. Hokkaido
Imp. Univ. 6:229-288.
2. Murfet, I. C. 1978. PNL
10:48-52.
3. Murfet, I. C. 1982. In Documentation of
Genetic Resources: A Model.
Eds. S. Blixt and J. T. Williams. IBPGR, Rome. pp.
45-51.
4. Sidorova, K. K., V. V. Khvostova, and L. P.
Uzhintseva. 1974. PNL
6:47.
5. Uzhintseva, L. P. and K. K. Sidorova. 1979.
Genetika 15:1076-1082.
6. White, 0. E. 1917. Proc. Am. Phil. Soc.
56:487-589.
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