Biodiversity and biogeography of the cacao (Theobroma cacao ) pathogen Moniliophthora roreri in tropical America
Moniliophthora roreri, the cause of moniliasis or frosty pod rot, occurs on the neotropical rainforest genera Theobromaand Herrania. While this basidiomycete has had devastating effects on the cacao tree (T.cacao) in tropical America,where it is confined, little is known of its biogeography and intraspecific genetic variability. Here, AFLP and ISSR profilesof 94 isolates of M. rorerifrom across its geographic range in Central/South America were analyzed. The study providedlimited evidence to support the hypothesis that M. roreriis capable of sexual reproduction. The highest levels of geneticdiversity occurred in Colombia and not in Ecuador as originally believed. The fungus was broadly divided into fivegenetic groups. Two of these have a wide geographic range: Bolívar group (north of Santander in Colombia, easternVenezuela, peripheral Ecuador, Peru), and Co-West group (western Colombia, central Ecuador, Central America). Theother groups are all apparently endemic to Colombia (Co-East and Co-Central groups) or north-western Ecuador (Gilerigroup). We speculate that central/north-eastern Colombia may represent the centre of origin for M. roreri. Sequence datafrom the internal transcribed spacer region of the nuclear rDNA repeat were congruent with the AFLP/ISSR results, divid-ing M. roreriinto two broad groups: the Orientalis group, comprising most isolates from the Co-East, Co-Central andBolívar groups, and the Occidentalis group, comprising isolates from the Co-West and Gileri groups. The spread ofM. roreri into new areas and countries mediated by human activity is discussed.
| Main Authors: | , , |
|---|---|
| Format: | biblioteca |
| Language: | eng |
| Published: |
Londres (Reino Unido) Wiley
2007
|
| Subjects: | BIOGEOGRAFIA, ENFERMEDADES FUNGOSAS, FACTORES AMBIENTALES, DISTANCIA GENETICA, THEOBROMA CACAO, AMERICA TROPICAL, ORGANISMOS PATOGENOS, MONILIA, |
| Online Access: | https://doi.org/10.1111/j.1365-3059.2007.01646.x |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|