Seed storage protein size variations and their significance in the evolution and the systematics of Acacia and Prosopis (Mimosaceae)
1998
Bukhari, Y.M. | Koivu, K. | Kanerva, A.
Phylogenetic relationships among 20 species (38 accessions) of Acacia and ten (13 accessions) of Prosopis were estimated using data from seed storage protein size variations. Thirty-two different bands were detected (245 to 29 kD). The studied tetraploid, hexaploid and octoploid accessions of subgenus Acacia had almost the same numbers of bands. WAGNER parsimony analysis revealed six equally parsimonious trees of 72 steps with consistency index = 81.5% and retention index = 78%. The 50% majority rule consensus tree revealed four clades consistent with the three subgenera of Acacia and the genus Prosopis. Subgenus Aculeiferum appeared ancestral to subgenera Acacia and Heterophyllum. Prosopis africana appeared ancestral to the other studied Prosopis species and Acacia polyacantha ancestral to the other studied species of Aculeiferum. The two accessions of A. albida clustered within the ten accessions of the subgenus Aculeiferum. The results indicated that hexaploidy and octoploidy in Acacia were geologically more recent than tetraploidy, and that the evolution in Acacia proceeded towards a reduction in the concentration and number of variable protein molecules in the seed.
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