Morphological and genetic diversity of chili (Capsicum spp.) from Tabasco, Mexico
2008
E00644
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Details
Title
Morphological and genetic diversity of chili (Capsicum spp.) from Tabasco, Mexico
Meeting Name
Modern variety breeding for present and future needs, 18th Valencia 9-12 September, 2008 Spain
Imprint
Valencia Editorial Universidad Politecnica de Valencia Spain
Publication Date
2008
Description
p.221-222
Call Number
E00644
Summary
The chili (Capsicum spp.) has been studied only scarcely in Mexico, especially in the case of the Tabasco State. In this work the in situ morphological and genetic diversity of forty Tabasco's native and introduced populations of Capsicum are described. The samples were classified into twelve different racial types, of which nine belong to C. annuum, two to C. frutescens and another one to C. chinense. C. annuum and C. frutescens are present in all the explored sites and C. chinense was just observed in Nacajuca. The populations were classified: twenty as C. annuum, nineteen as C.frutescens and one C. chinense. The wild forms of C. annuum var. glabriusculum were found scattered in all the explored sites. In Cardenas the germplasm has originated by Capsicum interspecific crosses and by C. annuum intraspecific and inter-racial crosses whereas in Huimaguillo there was an intraspecific and intravarietal population. The eleven qualitative characteristics measured showed from two to five phenotypical classes. The germplasm was grouped in three main conglomerates on the basis of morphological data: one included the' amashito', 'piquin', 'ojo de cangrejo' and' desconocido' morphotypes; another one the 'pico paloma', 'garbanzo' and' muela' morphotypes and the third group included the commercial morphotypes ('serrano', 'morron', 'blanco', 'dulce' and 'habanera'). The AFLP genetic data included 1222 analyzed bands, which did not clearly separate to germplasm on the basis of morphotype, especially in endemic ones of Tabasco, which can be due to the common local agricultural practice to mix morphotypes in parcels by which it is probable that natural random recombination and genetic flow happens. This practice has resulted in the loss of well defined genetic groups at interspecific level. The grouping at species level also showed overlapping, especially between C. annuum and C. frutescens; on the other hand the wild morphotypes of C. annuum var. glabriusculum were genetically different from C. frutescens. The morphoagronomic characters grouped the germplasm into three main conglomerates on the basis of morphotypes separating clearly Tabasco endemic germplasm from the commercial introductions. The grouping did not show a relation with geographic originof the germplasm.
Book Title
Modern variety breeding for present and future needs; Proceedings of the 18th EUCARPIA general congress
Contact Information
harvest@worldveg.org
Record Appears in
Research > Published Articles