Registration of perennial Sorghum bicolor × S. propinquum line PSH12TX09

A novel sorghum [Sorghum bicolor (L.) Moench × S. propinquum (Kunth) Hitchc.] F₆ recombinant inbred line, PSH12TX09 (GS- 784, PI 675359), was identified that successfully overwintered across USDA plant hardiness zones 8a, 8b, and 9a between 2013 and 2015. Prior development from the initial interspecific hybridization through the F₃ generation was done at the USDA-ARS Southern Plains Area Research Center, College Station, TX; further advancement to F₆ was a collaborative effort between Texas A&M University, Texas A&M AgriLife Research, and the USDA-ARS. Winter survival of PSH12TX09 exceeded 90% at three locations in plant hardiness zones 9a, 8b, and 8a in both evaluation years, with no significant differences across locations. PSH12TX09 is significantly taller (≥60 cm), requires more days to anthesis (≥16 d), and is smaller in seed size (-66%) than the well-documented sorghum inbred line BTx623. As a highly overwintering genotype, PSH12TX09 may serve as a novel resource to further dissect mechanisms of perennialism as well as develop perennial sorghum germplasm suitable for utilization as grain, forage, and biofuel feedstocks.