%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Calatayud, Paul-André
%A Njuguna, E.
%A Mwalusepo, S.
%A Gathara, M.
%A Okuku, G.
%A Kibe, A.
%A Musyoka, B.
%A Williamson, David
%A Ong'amo, G.
%A Juma, G.
%A Johansson, T.
%A Subramanian, S.
%A Gatebe, E.
%A Le Rü, Bruno
%T Can climate-driven change influence silicon assimilation by cereals and hence the distribution of lepidopteran stem borers in East Africa ?
%D 2016
%L fdi:010066907
%G ENG
%J Agriculture Ecosystems and Environment
%@ 0167-8809
%K Eastern Afromontane ; Altitude ; Climate change ; Temperature ; Silicon ; Maize ; Lepidopteran stem borers ; Chilo partellus ; Busseola fusca
%K KENYA ; TANZANIE
%M ISI:000375809900011
%P 95-103
%R 10.1016/j.agee.2016.03.040
%U https://www.documentation.ird.fr/hor/fdi:010066907
%> https://www.documentation.ird.fr/intranet/publi/2016/06/010066907.pdf
%V 224
%W Horizon (IRD)
%X In East Africa, lepidopteran stemborers such as Chilo partellus and Busseola fusca are major constraints to production of maize, which is the main staple food crop in the region. Cereals depend on silicon (Si) based defences to fight off herbivores. Using attitudinal ranges in the East African highlands as ecological surrogates for inferring climate change, it was shown that Si concentrations in soil and maize decreased with altitude. This was attributed, in part, to low temperatures at high altitudes, which negatively affected Si assimilation by maize. Experiments showed that B. fusca was more susceptible to Si than C. partellus. Hence the predominance of B. fusca in the highlands and of C. partellus in the lowlands could be partly explained by attitudinal differences in Si concentrations in maize plants. Therefore, a rise in temperature due to climate change should enhance the plants' Si assimilation and as a result C partellus might move into the higher altitudes and increasingly displace B. fusca.
%$ 076 ; 021