The second generation of tropically adapted haploid inducers developed by the International Maize and Wheat Improvement Center (CIMMYT) are now available for use by interested breeders and institutions.
Haploid inducers are a specially developed maize genetic stock that are used to develop doubled haploid (DH) maize lines. DH maize lines are highly uniform, genetically pure and stable, making the maize breeding process more intuitive and efficient by simplifying logistics.
Purple maize varieties with high anthocyanin accumulation can have significant nutritional and economic value, but cannot be identified using the R1-nj marker.
Doubled haploid (DH) technology provides important benefits to maize breeding programs, as DH lines enhance genetic gains and improve breeding efficiency in addition to offering significant economic advantages. DH lines can be generated in less than half as many seasons as lines generated through traditional breeding, thus saving valuable time, resources and energy. The large scale production of DH lines is dependent on the identification of haploids at an early seedling stage. Haploids have traditionally been identified by the R1-nj (Navajo) anthocyanin color marker which, when crossed with haploid inducer lines through induction crosses, will produce haploid progeny seed with purple markings on its outer layer, or pericarp. This is to differentiate haploid from diploid seedlings, which are not useful for DH breeding.
CIMMYT is pleased to announce the release of a set of 16 new CIMMYT maize lines (CMLs). These CMLs were developed at various breeding locations of the CIMMYT Global Maize Program by multi-disciplinary teams of scientists in sub-Saharan Africa, Latin America and Asia. These lines are adapted to the tropical and subtropical maize production environments targeted by CIMMYT and partner institutions.