Rajesh Perianayagam1, Chibwe Chungu2, Lindsay Manley1, Yanxin Gao3, Stipe Vujevic4, Dean Nordick5, Ken Mayberry6, Bruce Nagel3, Samuel Ordonez7, Ardeshir Ahmadzadeh8, Tom Mack9, Cherie Ochsenfeld1, Jeffrey Posch10, JanErik Backlund1, David Meyer1 and Klaus Koehler11, (1)Trait Genetics and Technologies, Dow AgroSciences, Indianapolis, IN (2)Agrigenetics,Inc D/B/A Mycogen, Willmar, MN (3)Agrigenetics,Inc D/B/A Mycogen, Arlington, WI (4)Dow AgroSciences Canada Inc., St. Marys, ON, Canada (5)Agrigenetics,Inc D/B/A Mycogen, Breckenridge, MN (6)229 North Hwy 51, Mycogen Seeds, Arlington, WI (7)Agrigenetics,Inc D/B/A Mycogen, Huron, SD (8)Dow AgroSciences Canada Inc., Blenheim, ON, Canada (9)Agrigenetics,Inc D/B/A Mycogen, Olivia, MN (10)Dow AgroSciences, Olivia, MN (11)Dow AgroSciences, Indianapolis, IN
Corn (Zea mays L. ssp. Mays) is one of the most economically important monocot food crops worldwide. Development of high yielding varieties with desirable traits and allele combinations in a short time span is an important breeding objective in many programs. Trait introgression through backcross breeding has been a common method to incorporate one or a few genes from a donor into adapted varieties that are used in plant breeding for nearly a century but it is time consuming. However, use of Marker Assisted Selection (MAS) expedites the recovery of more than 99 % recurrent parent percent (RPP) in just three backcross generations, indicating that use of molecular markers increases the efficiency of introgressing the trait of interest. To meet the increased demands of the growing market, corn acres have expanded into the northern great plains of the United States. These regions were previously planted with cool season cereal crops such as wheat and barley. Corn grown in these “non-traditional” areas faces a much cooler and shorter growing season than corn grown across the traditional US Corn Belt. Therefore, the need arises to develop early maturing corn hybrids and parent lines that will mature and yield in these cooler and shorter growing regions. Our goal is to introgress donor segments from early lines into high yielding elite lines through marker assisted backcross breeding. At Dow AgroSciences, we have made significant progress in converting a few late maturing lines by optimizing population size, collecting appropriate phenotypic parameters and making selections by comparing SNP marker and phenotypic data. This approach aid in recovering high percentage of the recurrent parental genome which is associated with yield components while retaining donor segments associated with earliness. The results are discussed in the poster.