Testing local varieties of sorghum and cowpea for climate change adaptation
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Transcript of Testing local varieties of sorghum and cowpea for climate change adaptation
Testing Local Varieties of Sorghum, Cowpea and
Pigeon pea for Climate Change Adaptation
Germplasm selection from genebanks
On-station trials
Farmer varieties
On-farm trials
Collaborators
• National Plant Genetic Resources Centre, Tanzania and the
National Genebank of Kenya provided passport data for all
accessions of the target crops.
• 1609, 199 and 664 accessions of sorghum, cowpea and
pigeon pea respectively were analysed using GIS .
• Passport information was used to select candidate
accessions based on the agro-ecological conditions in which
the collections had been made.
• R software was used to implement a hierarchical clustering
method to group accessions into different categories.
• Accessions were clustered based on three variables (Annual average temperature, Annual precipitation and Agro-ecological
Zone).
• List of accessions selected was sent to the respective organizations to retrieve the accessions from the genebanks.
• Final list of accessions planted in the field included: 62, 20 and 32 accessions of sorghum, cowpea and pigeon pea
respectively.
• Three trial sites were identified in which the selected accessions were grown
for characterization, seed bulking and preliminary evaluation.
• On-station trials were carried out in Kenya (Katumani) and Tanzania (Arusha,
Dodoma and Morogoro).
• The same varieties of seeds were planted in all four sites so as to assess
how each variety performed in the different environmental and climatic
conditions.
• Randomized complete block design (RCBD) was used to lay down the plots.
• Each crop was replicated thrice.
• Same protocols were used for morphological characterization of the
germplasm in all 4 sites.
• On-station morphological characterization data was collected by a technician
on a daily basis during the cropping season.
• Data analysis was done using GeneStat software.
• Results of the on-station trials informed on-farm trials.
• Criteria used to identify the best performing accessions in the on-station
trials involved the following traits; seed yield, days to 50% flowering, pest
and diseases resistance/tolerance and plant height.
• The 20 best performing varieties from the on-station trials were planted in
each trial.
• On-farm trials were carried out in Kenya (Nyando and Makueni) and
Tanzania (Dodoma).
• Each site consisted 4 mother trials and 12 baby trials.
• Farmers who participated in the on-farm trials were randomly selected
from the villages.
• Environmental variation within a site was ensured through selection of
farmers located in different agro-ecological zones.
• Trials were researcher designed and farmer managed.
• Data was collected by field officers from the specific sites.
• MSc students from Kenya managed the Nyando and Makueni trials.
• Participatory Variety Selection (PVS) was conducted in all the on-farm
trials to select farmer preferred varieties.
• Farmers identified and listed the most preferred traits for each crop in
a participatory way.
• In order to have gender differentiated data farmers were grouped
separately i.e. 5 women and 5 men.
• Farmers walked through the on-farm plots to give a score to the
different crop varieties.
• Scores ranged from 1 to 5 i.e. 1 (most preferred) and 5 (less preferred).
For more information: African Biodiversity Conservation and Innovations
Centre, PO Box 100882 – 00101, Tel: +254 20 2330014, Mobile: +254 720
529884 , Nairobi, Kenya, www.abcic.org , [email protected]
Morogoro
Arusha
Kathonzweni
Hombolo
Hombolo
Hombolo
Kathonzweni
Hombolo