Registration of N619 to N640 Grain Sorghum Lines with Waxy or Wild-Type Endosperm

Sorghum [Sorghum bicolor (L.) Moench] lines N619 to N636 (A lines; Reg. No. GS-699 to GS-716, PI 670134 to PI 670151); N619 to N636 (B lines; Reg. No. GS-721 to GS-738, PI 671777 to PI 671794); and N637 to N640 (R lines; Reg. No. GS-717 to GS-720, PI 670152 to PI 670155) comprise nine pairs of seed parent (A/B) lines, and two pairs of pollinator (R) lines (11 pairs total) that are near-isogenic for waxy (low-amylose) or wildtype endosperm. Breeding work was conducted jointly by the USDA-ARS and the Agricultural Research Division, Institute of Agriculture and Natural Resources, University of Nebraska, and the lines were released in May 2014. Release of these lines makes available two different waxy (wx) alleles (wx(a) and wx(b)) for development of grain sorghum as a source of low-amylose starch, whose end use is targeted to the ethanol and food industries. In particular, the release of wx and wild-type near-isogenic pairs facilitates the evaluation of agronomic performance of wx genotypes, and the release of both A/B and R lines facilitates the production of waxy grain hybrids.