Abstract

NUNEZ-COLIN, Carlos A. et al. Characterization of Tagetes filifolia from central-south Mexico by morphometric achene traits. Rev. Mex. Biodiv. [online]. 2011, vol.82, n.2, pp.539-549. ISSN 2007-8706.

Tagetes filifolia Lag. is a ruderal species widely distributed in Mexico from which is starting to make knowledge about its morphological variability as a part of a study sequence related with its possible domestication to obtain biopesticides. For acquiring more knowledge on this plant resource, 104 accessions from central-south Mexico were morphologically characterized by 11 achene traits employing a digital images technique. Five different morphologic groups were identified. Group I had accessions with small and wide achenes, group II had big and wide achenes, group III had small and long achenes, group IV had big and long achenes, and group V had big achenes but longer than group IV. The most discriminant variables were elongation index, compactness index, roundness index, minor axis length/ major axis length ratio to get the canonical root 1, and longitudinal perimeter and major axis length to get the canonical root 2. The variability in shape and size of T. filifolia achenes was grouped in 5 morphotypes, however not all morphotypes were present in all the central-south region of Mexico.

Keywords : Asteraceae; Tageteae; achene variability; morphology; multivariate analysis.

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