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INTERCHANGE HETEROZYGOSITY IN DIPLOID INTERSPECIFIC HYBRIDS IN GRINDELIA (COMPOSITAE)
Author(s) -
Dunford Max P.
Publication year - 1970
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1970.tb09858.x
Subject(s) - biology , hybrid , ploidy , loss of heterozygosity , botany , genus , interspecific hybrids , taxon , evolutionary biology , genetics , allele , gene
Some interspecific hybrids between geographically separated diploid taxa of Grindelia have meiotic configurations which indicate interchange heterozygosity, while others do not. Hybrids between G. procera Greene, G. hallii Steyermark, and G. camporum var. davyi (Jepson) Steyer‐mark (all from California) have 6 II ***, as do those between G. oxylepis var. eligulata Steyermark (Mexico) and G. squarrosa (Pursh) Dunal (Utah and New Mexico). When G. procera, G. camporum var. davyi , and G. hallii are crossed to G. oxylepis var. eligulata the hybrids have 4 II and 1 IV as do hybrids between G. oxylepis var. eligulata and G. havardii Steyermark (New Mexico). The G. procera × G. havardii and G. camporum var. davyi × G. havardii hybrids had a maximum configuration of 2 II and 2 IV , which indicates the interchanges in the genomes of the California diploids and G. havardii do not involve the same chromosomes. Hypothetical chromosome end arrangements and names for the respective genomes, based on G. oxylepis as a standard, are presented. These data corroborate a previously published phylogenetic scheme of the genus based on morphological, ecological, and distributional studies.