1. School of Biological Sciences, Washington State University, 2710 Crimson Way, Richland, WA 99354, USA; and US Dairy Forage Research Center, US Department of Agriculture-Agricultural Research Service, 1925 Linden Drive, Madison, WI 53706, USA
2. Department of Viticulture and Enology, Washington State University Irrigated Agriculture Research and Extension Center, 24106 North Bunn Road, Prosser, WA 99350, USA
3. School of Biological Sciences, Washington State University, 2710 Crimson Way, Richland, WA 99354, USA