Maize Germplasm Phenotypes Over sixty different phenotypic traits have been scored for our core set of germplasm. For several years in both the North Carolina and Florida field seasons, Major Goodman's group of researchers has scored many of the basic agronomic traits. Recently, we have started more detailed studies of our core set, which includes 102 lines. We also have several collaborators growing these lines in diverse environments, such as Torbert Rocheford in Illinois, Lauren MacIntyre at Purdue, and Georgia Davis at Missouri. A number of folks are also collaborating on the scoring of biochemical and physiological phenotypes, such as Wally Yokohama, Steve Szalma, Tom Brutnell, Torbert Rocheford, Georgia Davis, Paul Scott, and Rudolf Jung. The following is a list of the phenotypes we have currently scored:
20 Kernel Weight
Armyworm - Leaf Damage
Armyworm - Tassel Damage
Cob Color
Cob Diameter
Cob Mass
Days to Silk
Days To Tassel
Ear Diameter
Ear Height
Ear Height - Border Plant
Ear Length
Ear Mass
Ear Number
Ear Rank Number
Ear Row Number
Germination Count
Ht4 Northern Leaf Blight Resistence
Kernel Color
Kernel Fill Percentage
Kernel Row Arrangement
Kernel Type
Leaf Chlorophyll
Leaf Length
Leaf Sheath Length
Leaf Width
Leaf Width - Border Plant
Main Spike Length
Middle Leaf Angle
Northern Leaf Blight
Northern Leaf Blight (Percentage)
Northern Leaf Blight - Incubation Period
Number of Brace Root Nodes
Number of Nodes Ear to Roots
Number of Nodes Tassel to Ear
Number of Tillering Plants
Phylotaxy
Plant Height
Plant Height - Border Plant
Pollination Date
Row Quality
Rust
Secondary Branch Number
Seed Set Length
Silking Date
Smut Incidence
Smut Severity
Spikelets - Main Spike
Spikelets - Primary Branch
Stalk Thickness
Stalk Thickness - Low
Stalk Width
Stalk Width - Low
Stand Count
Tassel Branch Length
Tassel Length
Tassel Primary Branches
Tassel Sterility
Tasseling Date
Tillering Index
Tillering Index - Border Plant
Total Kernel Volume
Upper Leaf Angle
Upper Leaf Angle - Border Plant
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Germplasm OverviewMaize has tremendous phenotypic and molecular diversity which can be harnessed for great gains in agricultural breeding programs. However, to use this diversity effectively, we must first understand the evolutionary history, phenotypic variation, and molecular variation of the germplasm. Maize Germplasm Variation: We are studying phenotypic and molecular variation in 303 inbred lines that Major Goodman has collected over the years. These lines capture nearly 85% of the common SNP diversity in maize. This intensive study also includes the evaluation of 50 phenotypic traits and expression profiling for this same group of plants. We have developed 25 linkage mapping populations from carefully chosen lines that together capture roughly 80% of the common SNP diversity in maize. Each of these 25 lines has been crossed to B73, and we have derived 5000 recombinant inbred lines (RILs) from these. These lines have been genotype for about 1200 markers, and will be regenotyped at 10,000s markers in 2010. Phenotypic data on these lines and hybrids can be accessed through this site. If any the original 25 lines or the 303 inbred lines would be of use to map your trait of interest they are publically available through the National Plant Germplasm System. To obtain seed please contact Mark Millard  . The 5000 Nested Association Mapping RILs are also available through the Maize Genetics Cooperation Stock Center at the University of Illinois, Urbana/Champaign. |
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