Host plant diversity of Sesamia calamistis : cytochrome b gene sequences reveal local genetic differentiation
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Date
2008Author
Ong’amo, G O
Le Rü, B. P.
Moyal, P
Calatayud, P A
Le Gall, P
Ogol, C. K. P. O
Kokwaro, E. D
Capdevielle-Dulac, C
Silvain, J.-F
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
Sesamia calamistis
Hampson (Lepidoptera: Noctuidae) is one of the indigenous stem borer pests
associated with maize (
Zea mays
L.) and sorghum [
Sorghum bicolor
(L.) Moench] (both Poaceae) in
Africa. Its pest status varies across the continent and this has been attributed to variation in diet
breadth and ecological preferences among populations. Its larvae were found on 12 plant species
during a study initiated at four sites (Muhaka, Mtito Andei, Kakamega, and Suam) in Kenya to
estimate its diet breadth and genetic population structure. Ten of the infested plant species belonged
to the family Poaceae [
Echinochloa haploclada
(Stapf) Stapf,
Eleusine corocana
L.,
Eleusine jaegeri
Pilg.,
Panicum deustum
Thunb,
Panicum maximum
Jacquin,
Pennisetum purpureum
Schumacher,
Setaria verticillata
(L.) P. Beauv.,
Sorghum arundinaceum
(Desvaux) Stapf,
S. bicolor
, and
Z. mays
];
the other two were Cyperaceae:
Cyperus distans
L. and
Cyperus dives
Delile. Combined with collections
from other African countries (Uganda, South Africa, Benin, Ghana, Nigeria, and Togo), comparisons
of partial cytochrome
b
sequences revealed the presence of 68 haplotypes that differentiated into
clades I and II. In Kenya, the two clades colonized different regions, except in Mtito Andei where they
co-existed. Individuals from Mtito Andei could be separated based on their host plants: clade I with
14 haplotypes was found mainly on maize (78.6%), whereas clade II with 10 haplotypes was found
mainly among wild host plants (63.6%). Detection of divergence among these clades with cytochrome
b
suggests that their evolutionary separation may have taken place about one million
years ago. This article discusses the potential implication of this differentiation for the management
of
S
.
calamistis
as a pest of maize and sorghum in Africa
Citation
Entomologia Experimentalis et Applicata 128 : 154–161, 2008Publisher
© 2008 The Netherlands Entomological Society School of biological sciences
Subject
diet breadthhaplotypes
pest management
wild hosts
maize
sorghum
Lepidoptera
Noctuida
Poaceae
mitochondrial gene
population structure