Interspecific Hybridisation in Vicia Section Faba: Comparison of Selfed and Hybrid Embryo and Endosperm

SynopsisEcological conditions for intergametophytic mating and interspecific hybridisation in the clubmosses are discussed. Several features, including the number of recorded hybrids, records of gametophyte population densities, and conditions for movement of the male gamete in the soil, indicate that intergametophytic mating in Lycopodium is not especially impeded by the subterranean habitat, as has been commonly assumed. The evidence from one site indicates highly effective spore dispersal, and a greater ecological tolerance than expected for the species involved. Two cases are discussed in which hybrids have been formed between ecologically and/or taxonomically very different parent species, in the absence of one parent sporophyte, or with one of the parent species sporophyte poorly adapted to the hybrid habitat. The protected, relatively uniform, subterranean gametophyte habitat is thought to account for successful gametophyte growth and hybridisation between species of widely different sporophyte ecology.

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Hybrid embryo formation in an intersubgeneric cross of soybean (Glycin max MERILL) with a wild relative (G. tomentella HAYATA).

Ikushugaku zasshi ◽

10.1270/jsbbs1951.35.363 ◽

1985 ◽

Vol 35 (4) ◽

pp. 363-374 ◽

Cited By ~ 6

Author(s):

Takako SAKAI ◽

Norihiko KAIZUMA

Keyword(s):

Wild Relative ◽

Embryo Formation ◽

Hybrid Embryo

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Genetics and breeding of Sitka spruce

Proceedings of the Royal Society of Edinburgh Section B Biological Sciences ◽

10.1017/s0269727000006266 ◽

1987 ◽

Vol 93 (1-2) ◽

pp. 41-50

Author(s):

Roy Faulkner

Keyword(s):

Phenotypic Selection ◽

Sitka Spruce ◽

Interspecific Hybridisation ◽

Family Selection ◽

Short Term ◽

Improvement Programme ◽

Important Trait ◽

Clonal Testing ◽

Selection For ◽

Old Trees

SynopsisSitka spruce is a monoecious, wind-pollinated, cross-fertilising species showing wide genetic variation which suggests heterozygosity for many alleles and natural selection against self-fertilisation. Phenotypic selection for the important trait of vigour is ineffective, so testing progenies of selected individuals and clonal testing is an essential and time-consuming part of any improvement programme. Old trees can be vegetatively propagated by grafting and very young trees by rooted cuttings.The British tree improvement programme is based, in the short term, on the use of seed collected from superior plantation trees of desirable origins; in the mid term on seed derived from clonal orchards based on mixtures of clones previously tested for superiority in family tests; and in the longer term on highly superior seed or clones derived from a system of recurrent mating with family selection. Three populations are being developed. There is a small interspecific hybridisation programme.

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