Open AccessThe backcross analysis of complex gametophytic complementary S gene systems in diploid angiosperms
Author(s) -
LUNDQVIST ARNE,
ØSTERBYE ULLA,
LARSEN KNUD
Publication year - 1981
Publication title -
hereditas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 50
eISSN - 1601-5223
pISSN - 0018-0661
DOI - 10.1111/j.1601-5223.1981.tb01415.x
Subject(s) - biology , backcrossing , genetics , ploidy , gene , diallel cross , pollen , gene mapping , botany , chromosome , hybrid
Conventional diallel schemes of pollination between sibs in F 1 or I 1 , families rapidly become unduly difficult to handle in the genetic analysis of complex gametophytic S gene mechanisms. In order to promote research into these mechanisms, their distribution, genetic architecture and mode of team cooperation, a two‐step backcross scheme has been elaborated, in which an F 1 , plant is backcrossed with pollen from its maternal parent. This scheme considers (1) the frequency with which a particular S gene constellation segregates in this F 1 plant, and (2) the range of S gene constellations segregating in its maternal parent. Complications in the backcross scheme may arise, which are caused by (1) S genes shared by the two original plants and transmitted to the F 1 plant, (2) homozygous S loci occurring in the maternal parent, (3) linkage of S loci, (4) selective fertilization. The complete combinatory scheme, for S gene systems of various degrees of complexity, is presented for overcoming these difficulties in the consideration of the combined set of data in a two‐step backcross analysis of complex gametophytic complementary S gene systems in diploid angiosperms.