DEVELOPMENT OF EARLY MATURING GEM LINES WITH VALUE-ADDED TRAITS
North Central Regional Plant Introduction Station, Ames, Iowa
2012 Annual Report
1a.Objectives (from AD-416):
Develop early maturity (RM<95 days) germplasm with value added-traits (VAT) utilizing exotic sources originating from the GEM Project. VAT's include composition for protein, oil, and starch.
1b.Approach (from AD-416):
Top crosses will be evaluated for performance in early maturity environments of North Dakota. Lines will be selected based on a benchmark for yield and moisture of 101%, and 95-100% respectively. The selected lines will be studied for VAT's. Three stiff-stalk, and six non-stiff stalk populations will be advanced and further selected in the nursery for future development.
This project relates to the primary objectives of the parent project which includes the development and evaluation of very early maturity germplasm (90 days relative maturity) with key value-added traits. Early maturity germplasm is deficient in genetic diversity and the long term impact of this project can potentially broaden the germplasm for the northern US Corn Belt region. Initially, 152 GEM lines were introduced for further development and backcrossed to ND early inbreds so that the GEM background was ~25%. Important breeding crosses included the accessions BR52051 which provided low grain moisture, CH05015 and FS8B(T) which were high in protein and oil, and CUBA117 with high protein. Nine new populations (not yet released) look promising. Preliminary observations identified a breeding cross with the accession SCO1 (St. Croix race) which is early with high oil, three new Argentina sources with high extractable starch, and DK844 which is early with high starch. An important source was EarlyGEM 21 which is an early synthetic with 25% Argentina germplasm. GEM germplasm provides a unique pool of germplasm which is new to the northern Corn Belt. Seven GEM derived cultivars have been released to the industry and farmer coops in ND.