Increased grain protein content and its association with agronomic and end-use quality in two hard red spring wheat populations derived from Triticumturgidum L. var. dicoccoides

Suitability of wheat (Triticum aestivum L.) for many food products depends on its unique protein. Elevated grain protein content (GPC) and its quality influences the bread making properties of wheat. The objective of this stu dy was to examine the association of elevated GPC with agronomic and end-us e quality in two hard red spring wheat recombinant inbred (RI) populations derived from wild emmer ( Triticum turgidum L. var. dicoccoides). The two h ard red spring populations (ND683/Bergen and Glupro/Bergen) were developed using a single-seed-descent method. ND683 and 'Glupro' are high in GPC (180 g kg(-1)), presumably due to the introgression of gene(s) from Triticum tu rgidum L. var. dicoccoides and 'Bergen' is low in GPC (145 g kg(-1)). From each of the two populations 12 high- and 12 low-GPC RI lines (F-5:7) were s elected for replicated testing at two North Dakota (ND) locations in 1995. In both populations, the high-GPC lines had significantly (p <0.05) higher values compared to the low-GPC lines for mean GPC and water absorption. Mea n grain yield of the high-GPC lines was not significantly different from th e low-GPC lines in both populations. In the ND683/Bergen population, the hi gh-GPC lines had significantly (p <0.05) higher values than the low-GPC lin es for mean plant height, days to heading, and flour extraction. GPC was si gnificantly (p <0.05) and negatively associated with test weight and also s ignificantly (p <0.01) and positively associated with water absorption in t he Glupro/Bergen population. In these populations, results suggested that i t may be possible to select lines that combine higher GPC and acceptable yi eld level, but later in maturity and taller in plant height.