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Phylogenetic relationships of Salix (Salicaceae) based on rbc L sequence data
Author(s) -
Azuma Takayuki,
Kajita Tadashi,
Yokoyama Jun,
Ohashi Hiroyoshi
Publication year - 2000
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 - 10.2307/2656686
Subject(s) - biology , monophyly , phylogenetic tree , salicaceae , botany , taxon , phylogenetics , eudicots , genus , pollen , chloroplast dna , evolutionary biology , stamen , clade , taxonomy (biology) , gene , genetics , woody plant
Nucleotide sequences of the chloroplast‐encoded rbcL gene were used to examine phylogenetic relationships of the genus Salix together with other allied genera of the family Salicaceae. Phylogenetic analyses of rbcL sequences strongly suggest the monophyly of three commonly recognized genera ( Chosenia, Salix, and Toisusu ). Two monophyletic groups are recognized within the larger monophyletic group. They do not correspond with any infrageneric taxa proposed so far. With regard to character evolution, it is thought that the reduction of stamen number from more than two stamens to two might occur in at least three lineages and that fused bud scales evolved several times and/or the reverse evolution occurred from fused to free. Some types of pollen surfaces are considered to have evolved independently.