Journal article
Ecological Genetic Divergence of the Fungal Pathogen Didymella rabiei on Sympatric Wild and Domesticated Cicer spp. (Chickpea)
Applied and environmental microbiology, Vol.76(1), pp.30-39
01/2010
Handle:
https://hdl.handle.net/2376/112995
PMCID: PMC2798644
PMID: 19897759
Abstract
For millennia, chickpea (
Cicer arietinum
) has been grown in the Levant sympatrically with wild
Cicer
species. Chickpea is traditionally spring-sown, while its wild relatives germinate in the autumn and develop in the winter. It has been hypothesized that the human-directed shift of domesticated chickpea to summer production was an attempt to escape the devastating Ascochyta disease caused by
Didymella rabiei
. We estimated genetic divergence between
D. rabiei
isolates sampled from wild
Cicer judaicum
and domesticated
C. arietinum
and the potential role of temperature adaptation in this divergence. Neutral genetic markers showed strong differentiation between pathogen samples from the two hosts. Isolates from domesticated chickpea demonstrated increased adaptation to higher temperatures when grown
in vitro
compared with isolates from the wild host. The distribution of temperature responses among progeny from crosses of isolates from
C. judaicum
with isolates from
C. arietinum
was continuous, suggesting polygenic control of this trait.
In vivo
inoculations of host plants indicated that pathogenic fitness of the native isolates was higher than that of their hybrid progeny. The results indicate that there is a potential for adaptation to higher temperatures; however, the chances for formation of hybrids which are capable of parasitizing both hosts over a broad temperature range are low. We hypothesize that this pathogenic fitness cost is due to breakdown of coadapted gene complexes controlling pathogenic fitness on each host and may be responsible for maintenance of genetic differentiation between the pathogen demes.
Metrics
12 Record Views
Details
- Title
- Ecological Genetic Divergence of the Fungal Pathogen Didymella rabiei on Sympatric Wild and Domesticated Cicer spp. (Chickpea)
- Creators
- Omer Frenkel - Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, IsraelTobin L Peever - Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, IsraelMartin I Chilvers - Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, IsraelHilal Özkilinc - Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, IsraelCanan Can - Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, IsraelShahal Abbo - Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, IsraelDani Shtienberg - Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, IsraelAmir Sherman - Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, Israel
- Publication Details
- Applied and environmental microbiology, Vol.76(1), pp.30-39
- Academic Unit
- Plant Pathology, Department of
- Publisher
- American Society for Microbiology (ASM)
- Identifiers
- 99900547723801842
- Language
- English
- Resource Type
- Journal article