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American Journal of Botany, Vol 85, 855, Copyright © 1998 by Botanical Society of America, Inc.

SYSTEMATICS AND PHYTOGEOGRAPHY

Pattern of morphological variation and diversity of Cocos nucifera (Arecaceae) in Mexico

D Zizumbo-Villarreal and D Piņero

The pattern of morphological variation of Cocos nucifera in Mexico was statistically and numerically evaluated. Forty-one populations were analyzed, using 17 morphological fruit characters. Principal components and cluster analyses indicated four main groups of coconut populations that showed high similarity with four different genotypes recently imported into Mexico from areas that could be the origin of Mexican coconut populations. These four genotypes were evaluated with regard to the lethal yellowing disease in Jamaica and showed a differential susceptibility. Therefore it is possible to speculate upon a difference in susceptibility of the Mexican genotypes. The analysis of correlation between morphological and geographical distances showed a high positive correlation that supports: (1) historical evidence that indicates early introductions of coconut from different regions of the world, (2) that on both coasts of Mexico two different patterns of dispersal were involved: continuous and in jumps. Collectively these results suggest that the impact of the lethal yellowing disease on coconut populations will vary depending on the specific area and the origin of its coconuts.


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D. Zizumbo-Villarreal, M. Ruiz-Rodriguez, H. Harries, and P. Colunga-GarciaMarin
Population Genetics, Lethal Yellowing Disease, and Relationships among Mexican and Imported Coconut Ecotypes
Crop Sci., November 21, 2006; 46(6): 2509 - 2516.
[Abstract] [Full Text] [PDF]


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Copyright © 1998 by the Botanical Society of America, Inc.