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Comparative Leaf Flavonoid Chemistry of Coreopsis nuecensoides and C. nuecensis (Compositae), a Progenitor-Derivative Species-Pair
Edwin B. Smith and Daniel J. Crawford
Bulletin of the Torrey Botanical Club
Vol. 108, No. 1 (Jan. - Mar., 1981), pp. 7-12
Published by: Torrey Botanical Society
Stable URL: http://www.jstor.org/stable/2484331
Page Count: 6
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Coreopsis nuecensoides and C. nuecensis represent a progenitor-derivative species pair with the latter having evolved from the former via chromosomal repatterning. The two species are reproductively isolated as a result of chromosomal translocations but are exceedingly similar morphologically. Their leaf flavonoid chemistries differ in several significant respects. Coreopsis nuecensis exhibits 6-methoxyflavonoids (6-methoxyluteolin 7-0-glucoside and 6-methoxyquercetin 7-0-glucoside), which are lacking in C. nuecensoides. The latter species contains flavonols (quercetin 3-0-glucoside and 3-0-rutinoside) and the flavone apigenin 7-0-glucoside, all of which are lacking in C. nuecensis except for a flavonol in one population. The divergent leaf flavonoid chemistries are hypothesized to be due either to accumulated genetic differences in the flavonoid biosynthetic pathways after chromosomal restructuring or a regulatory change in flavonoid biosynthesis associated with chromosomal repatterning. It is possible that both factors may have been involved in providing the rather striking chemical differences.
Bulletin of the Torrey Botanical Club © 1981 Torrey Botanical Society