Early Leaf Spots (ELS) is one of the major fungal foliar diseases in Mali negatively affecting agronomic performance of groundnut where yield reduction can exceed 30%. It is important to develop new varieties that combine yield potential and tolerance to ELS, scientist under the umbrella of TL III aimed to develop highly yielding medium duration groundnut tolerant to ELS which is discussed in the poster presentation.

1. Development of high yielding medium duration groundnut tolerant
to Early Leaf Spots in Mali
Dramane Sako*, Mamary Traoré, Fodé Diallo, Folocoum Doumbia and Abdoulaye Tapo
* head of Groundnut Programme, Institut d’Économie Rurale, Samé, Kayes, Mali.
E-mail: dramanesako@yahoo.fr.
Abstract
Early Leaf Spots (ELS) is one of the major fungal foliar diseases in Mali
negatively affecting agronomic performance of groundnut and yield
reduction can exceed 30%. It is important to develop new varieties that
combine yield potential and tolerance to diseases. This study aims to
develop highly yielding medium duration groundnut tolerant to ELS. A
crossing bloc was established with three ELS tolerant varieties (ICGV
01276, ICGV 99029 and ICG 7878) obtained from ICRISAT Bamako as
female parents and three farmers preferred varieties (Fleur 11, JL 24
and ICIAR 19BT) from IER to generate a number of F1’s using North
Carolina mating design II. Backcrossing has been performed on
confirmed hybrids using farmers preferred varieties as recurrent
parents at Same’ Research Station, 281 masl, 9°23’’W and 15°02”N
in the Sahelian zone of Kayes area, annual rainfall 600 to 800 mm per
year. Besides, 81 lines tolerant to ELS from ICRISAT have been
evaluated in preliminary trials using lattice 9x9 in three replications.
From the preliminary trials 33 best performing lines and three local
checks were selected for use in advanced trials using 6x6 lattice in
three replications. Further selection will be done to identify best lines for
multi-location evaluation. Eight backcross populations are available for
background selection and best performing lines will be identified for
multi-location trial. IER completed registration of 5 varieties (ICGV
86015, ICGV 86024, J11, ICGV 99029 and ICGV 86124) in national
release catalogue. Ten promising lines showing tolerance to ELS have
been identified from multi-locational trials and will go for registration.
Objectives
To develop high yielding medium duration groundnut tolerant to Early
Leaf Spots
Methods
Crossing bloc has been set using three tolerant varieties to Early Leaf
Spots (ICGV 01276, ICGV 99029 and ICG 7878) collected from
ICRISAT Bamako and three farmers preferred varieties (ICIAR 19BT,
Fleur 11 and JL 24) from IER to generate a number of F1’s using North
Carolina mating design II. Backcrossing has been performed on
confirmed hybrids using farmers preferred varieties as recurrent to
generate BC1 population. In offseason, the development of BC2
population is ongoing by backcrossing BC1 to recurrent parents.
Besides, 81 lines tolerant to ELS from ICRISAT have been evaluated in
preliminary trials using lattice 9x9 in three replications. From the
preliminary trials 33 best performing lines and three local checks were
selected for use in advanced trials using 6x6 lattice in three
replications. From the advanced trial 12 best lines have been identified
for multi-location evaluation using RCBD in three replications in 3
locations.
.
Results
Eight BC1 populations were found for the development of BC2 populations
segregating for ELS and medium maturity duration.
Perspectives
Development of BC2 and BC3
Phenotyping and genotyping of BC3
Detection and QTL analysis for ELS
Breeders checking after harvesting of BC
Acknowledgements
IER
ICRISAT
Bill and Melinda Gates Foundation
Technichian making crosses
Impression:PAOBougou66762200
Pedigree BC1 obtained
ICGV 01276/JL 24 101
ICGV 01276/Fleur 11 246
ICGV 01276/ICIAR 19BT 299
ICG 7878/JL 24 0
ICG 7878/Fleur 11 36
ICG 7878/ICIAR 19B 33
ICGV 99029/JL24 274
ICGV 99029/Fleur 11 230
ICGV 99029/ICIAR19BT 186
Total 1405