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CHLOROPLAST DNA EVIDENCE FOR GENOME DIFFERENTIATION IN WILD POTATOES (SOLANUM SECT. PETOTA: SOLANACEAE)
Author(s) -
Spooner David M.,
Sytsma Kenneth J.,
Conti Elena
Publication year - 1991
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.1537-2197.1991.tb12602.x
Subject(s) - biology , genome , paraphyly , polyploid , phylogenetic tree , genetics , chloroplast dna , evolutionary biology , botany , gene , clade
Chloroplast DNA restriction site analysis has been used to test Hawkes's phylogenetic interpretations of the genomic data in Solanum sect. Petota. Hawkes hypothesized a diploid (2 n = 24) origin of the tuber‐bearing members of this group (subsection Potatoe ) in Mexico and Central America (as a B genome) with later migrations and evolution to an A genome in South America, later followed by a return migration of the A genome to Mexico and Central America with A × B hybridizations and polyploidizations to produce ser. Longipedicellata (4x) and Demissa (6x). Our results provide partial support for this hypothesis by demonstrating the paraphyletic and primitive nature of the B genome species group, and the monophyletic and derived nature of all A genome and A × B genome species, including S. verrucosum , a hypothesized A genome progenitor of ser. Demissa. Thus, the Mexican and Central American polyploid species must have obtained their cytoplasm from the A genome. However, our results question the Stellata/Rotata hypothesis of Hawkes and the taxonomic placement of S. chomatophilum in ser. Conicibaccata.