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Recent advances
towards insect-resistant maize through conventional and Bt technology in
Kenya
S. Mugo, B.
Odhiambo, H. De Groote, D. Bergvinson
Insect Resistant
Maize for Africa (IRMA) aims to develop conventional and biotechnology
derived stem borer–resistant maize varieties and deploy them to
resource-poor farmers in Kenya and other interested countries in Africa. The
IRMA project adopted several key aspects to ensure success including 1)
involvement of farmers, 2) study of the Kenyan maize sector, 3) a
two-pronged approach using conventional and genetic engineering tools, and
4) development of publicly derived Bt (Bacillus thuringiensis) maize
events without selectable marker genes. Others are 1) collection of baseline
data on target and non-target insect species of Bt toxins, 2) development of
plausible insect-resistance management strategies, 3) regular stakeholder
meetings, and 4) development of infrastructure and human capacity. To ensure
development and deployment of Bt maize in Kenya in the public–private
partnership, it was important to address technical, regulatory, proprietary
and stewardship issues. Conventional insect-resistant maize germplasm with
leaf toughness as the main mechanism has been developed and is currently
being tested in the Kenya maize national performance trials that started in
February 2004. This germplasm combines the best in insect resistance from
the International Maize and Wheat Improvement Center (CIMMYT) and the
adapted maize in Kenya. Conventional resistance faces challenges from its
genetics and implementation. It was meant to offer farmers an option as they
await the more effective and durable resistance based on Bt genes.
Transgenic (Bt) maize plants with clean events have been developed with the
final product carrying only the gene of interest, without the selectable
marker gene. Transgenic (Bt) maize leaf tissue and seed have been introduced
in Kenya and evaluated against Kenyan stem borers in a biosafety laboratory
and in a biosafety greenhouse. Confined field evaluations are planned, while
a backcrossing program into adapted Kenya germplasm has been initiated. In
consideration of the regulatory requirements, environmental considerations
including studies on effects of non-target organisms, development of
feasible insect resistance management and gene-flow studies have been
carried out. Socio-economic studies have been carried out to establish the
potential demand for Bt maize in various farming communities in Kenya.
Participatory rural appraisals, baseline studies, impact assessment studies
as well as consumer attitudes have been studied. The capacity of Kenyans to
research on genetic engineering has been built through extensive training of
staff from the Kenya Agricultural Research Institute (KARI) and other
government of Kenyan agencies, including training on regulatory issues, and
through the development of infrastructure including a biosafety lab,
biosafety greenhouses, and open-quarantine sites. In conclusion, the IRMA
project’s plan to develop conventional and Bt-based insect-resistant maize
for Kenya and other willing African countries is on course.