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

Impre

ssio

n : P

AO

Bougou 6

6 7

6 2

2 0

0

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