*4.1. Genetic Stocks and Sampling Material*

The lpa1-1 mutant stock was kindly provided by Dr. Victor Raboy, USDA ARS, Aberdeen, ID, USA. To generate the mutagenized population, we used a line (genetic background B73/W22) carrying the *Ac* transposon on short arm of chromosome 1 (bin 1.02/03) kindly provided by Dr. Thomas Brutnell, Shandong Agricultural University, China.
