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Botaniska Notiser 1946, HXete 3. Lund
Meiosis in Godetia nutans x G. hispidula and in
Godetia Whitneyi, 4 n x G. Bottae.
Bv Artur Håkansson.
Institute of Genetics, Lund.
Meiosis has been studied by me in several species hybrids of the
genus Godetia (Håkansson 1941, a and b, 1942, 1943 a and b). These
hybrids had been produced by Dr. Gunnar Hiorth in Ås, Norway.
The results of the studies ön the cytology of two of the hybrids liave
not been published, and as it seems to be rather uncertain, if möre
material of Godetia can be fixed, I will publish these results now (ön
the systematics of the genus Godetia compare Hiorth 1941).
Godetia nutans X G. hispidula. G. nutans (n=14) is an
allotetra-ploid belonging to the amoena group of species. Meiosis in different
species hybrids of G. nutans shows that this species has one genoine in
common with G. Whitneyi, while the second genome of G. nutans can
not liave originated from the third species of the amoena group,
G. amoena. It seemed possible, that G. hispidula could be Ihe second
parent species of nutans, because G. hispidula has seven chromosomes
of about the same size as the chromosomes of the amoena group.
Hiorth has produced G. WhitneyiXG. hispidula, the diploid
hybrid from which possibly G. nutans bas arisen through doubling of
the chromosomes. The hybrid plants were, however, very small and
buds with meiosis s|äges could not be fixed, thus the relation of the
hispidula chromosomes to the Whitneyi chromosomes is unknown. The
hybrid G. nulansXG. hispidula could, however, be studied, and if the
pairing in this hybrid should be 7 II+ 7 I, il seemed probable, (hal
the second genome of G. nutans was a hispidula genome, because one
would not expect that the Whitneyi chromosomes of nutans could pair
regularly with hispidula chromosomes. Two different races of nutans,
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