作者单位:Zamorano University, Km 30 carretera a Danlí, Tegucigalpa, Honduras[1]United States Department of Agriculture- Agriculture Research Service, 5230 Konnowac Pass Rd., Wapato, WA 98951[2]University of Texas at Tyler, 3900 University Boulevard, Tyler, TX 75799[3]United States Department of Agriculture- Agriculture Research Service, 24106 N. Bunn Rd., Prosser, WA 99350[4]