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Cytogenetic evidence for autopolyploidy in Parnassia palustris
Author(s) -
WENTWORTH J. E.,
GORNALL R. J.
Publication year - 1996
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1996.tb04929.x
Subject(s) - meiosis , biology , ploidy , karyotype , pollen , botany , chromosome , cytogenetics , genetics , zoology , gene
summary Diploid populations of Parnassia palustris L. var. palustris and var. condensata Travis & Wheldon have a highly symmetrical karyotype, consisting of seven metacentrk and two submetacentric chromosomes. The gross morphology of the karyotype of tetraploid populations is indistinguishable from that of the diploids. Studies of meiosis in tetraploids of both varieties demonstrated a high frequency of quadrivalent formation, strongly suggesting an autopolyploid origin. Later stages of meiosis in the tetraploids are regular and the pollen shows no decrease in stainability compared with that of the diploids. Some evidence is presented to show that tetraploids of both varieties may have a wider ecological amplitude than do diploids.