CYTOGENETIC STUDIES IN THE GENUS POTENTILLA L.

Abstract

Cytogenetic studies involving eighteen species of Potentilla of the section Gymnocarpae were made to investigate their phylogenetic relationships and to see whether any correlation exists between morphology and crossing relationships.The chromosome numbers of Potentilla ambigens Greene {zn = 82) and P. montenegrina Pant, {zn = 28) were determined for the first time. New intraspecific chromosome races were observed in three species: P. pennsylvanica L. (2« = 42), P. astrisanguinea Lodd. {zn = 84) and P. grandiflora L. (2« = 42).Hybrids were obtained from only four of 628 crosses in iii different combinations (P. nepalensis Hook, x P. montenegrina Pant., P. astrisanguinea Lodd. x P. ambigens Greene, P recta L. x P. cf. hirta L. and P. grandiflora L. x P. crantzii (Crantz) Beck.). The position of the crossing barrier in the unsuccessful crosses varied. Sometimes the pollen failed to germinate but in other cases well-developed pollen tubes were observed. No definite correlation was found between the morphological similarity of species and their crossing ability.Meiotic studies on the hybrids indicated some chromosomal homologies between the genomes of P. recta and P. cf. hirta and between P. grandiflora and P. crantzii, but not between P. nepalensis and P. montenegrina.

Potentilla—A review of its phytochemical and pharmacological profile

“…Hybridization has been mainly described in some taxa of subgenus Potentilla (Müntzing and Müntzing, 1941;Guillén et al, 2005). Members of the genus Potentilla represent an extensive polyploidal group with its chromosome number (n) being always a multiple of seven (Ball et al, 1968;Goswami and Matfield, 1975;Eriksson et al, 1998).…”

Conservation unit status inferred for plants by combining interspecific crosses and AFLP

“…Holm and Ghatnekar (1996) obtained similar results after interspecific crosses between diploid Potentilla argentea and hexaploïd P. argentea and P. collina (4.7% mean germination rate on 10 different interspecific crosses). Acharya Goswami and Matfield (1975) obtained only four hybrids of 628 crosses with three different interspecific crosses between Potentilla species (including P. grandiflora). The high number of pure P. delphinensis plants (36) resulting from crosses in which PD was the mother strongly suggested facultative apomixis in that species, similarly to several Potentilla that are known to be facultative apomictic (Acharya Goswami and Matfield 1975;Holm and Ghatnekar 1996;Nylehn et al 2003;Richards 2003).…”

“…Acharya Goswami and Matfield (1975) obtained only four hybrids of 628 crosses with three different interspecific crosses between Potentilla species (including P. grandiflora). The high number of pure P. delphinensis plants (36) resulting from crosses in which PD was the mother strongly suggested facultative apomixis in that species, similarly to several Potentilla that are known to be facultative apomictic (Acharya Goswami and Matfield 1975;Holm and Ghatnekar 1996;Nylehn et al 2003;Richards 2003). Selfing resulting from error of manipulation or unwanted insect pollination could not be totally excluded.…”

THE BIOLOGY OF CANADIAN WEEDS.: 18. Potentilla recta L., P. norvegica L., and P. argentea L.

“…The basic chromosome number for the genus Potentilla is n : 7 (Robertson 1974;Goswami and Matfield 1975 (Mulligan 1959;Darlington and Wylie 1956). An exception is Asker (1970a) (Gray 1889 (Frankton and Mulligan 1970 (Darlington et al 1940 No insects that infest other plants have been reported on P. recta, P. norvegica or P. argentea.…”