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CYTOGENETIC STUDIES IN CLARKIA, SECTION PRIMIGENIA. II. A CYTOLOGICAL SURVEY OF CLARKIA ARCUATA AND CLARKIA LASSENENSIS
Author(s) -
Snow Richard,
Imam Amal
Publication year - 1964
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.1537-2197.1964.tb06615.x
Subject(s) - biology , intraspecific competition , chromosomal translocation , botany , population , oenothera , evolutionary biology , zoology , genetics , demography , sociology , gene
Clarkia arcuata and C. lassenensis are the 2 members of the subsection Flexicaules. Although closely related morphologically, they show very different patterns of chromosomal variability in nature. About 25% of the plants grown from wild seed of C. arcuata, a predominantly cross‐pollinating species, were heterozygous for 1 or 2 translocations; such heterozygotes were found in 5 of the 9 populations sampled. An analysis of the chromosome pairing in intraspecific crosses indicated that at least 5 different translocations giving a ring of 4 with the “standard” strain, 2 giving a ring of 6, and 2 giving a ring of 8 are present in nature. No arrangement was found with widespread distribution, and it is impossible to say at present what might be the primitive arrangement of this species. One population was found to contain an inversion, a rearrangement which is very rare in Clarkia at the intraspecific level. In C. lassenensis, a predominantly self‐pollinating species, only 6% (3 plants) of a sample of 53 were translocation heterozygotes, and these heterozygotes were found in only 2 of 13 populations. Intraspecific crosses indicated that one chromosome arrangement, the “standard,” was present throughout the species range.