||Genetic Improvement of Iron Toxicity Tolerance in Rice -Progress, Challenges and Prospects in West Africa
Sikirou Mouritala ,
Kazuki Saito ,
Achigan-Dako Enoch Gbenato ,
Nani Drame Khady ,
AHANCHEDE ADAM ,
Venuprasad Ramaiah ,
||Plant Production Science
||Abstract: In sub-Saharan Africa, the demand for higher rice production continues to grow rapidly.
Although there is a huge potential for increasing rice production through expansion of the rice
cultivation area in wetlands, iron (Fe) toxicity tends to occur and consequently results in low rice
yield. Development and deployment of varieties tolerant to Fe toxicity is one of the practical
options to overcome this constraint. Several tolerant varieties have been developed through
conventional breeding but progress in breeding has been generally slow mainly due to large
genotype × environment interaction and field heterogeneity, which make rice selection ineffective.
In addition, there are no valid managed-stress screening protocols which are highly efficient and
that can predict rice performance in the diverse target environments of West Africa. Many O.
glaberrima accessions have superior tolerance, but only a few of them have been utilized in
breeding programs. The known quantitative trait loci (QTLs) related to Fe toxicity, have not been
used for marker-assisted selection (MAS), as they gave small effects with a large confidence
interval. Accelerating rice breeding efficiency for tolerance to Fe toxicity requires establishment of
reliable screening protocols, use of O. glaberrima accessions as donors, identification of large-effect
QTLs and MAS using such QTLs. This paper reviews the past and current efforts in West Africa to
develop new varieties with superior tolerance to Fe toxicity.
||423 - 434