Registration of ‘PU305’, ‘PU306’, and ‘PU307’ sorghum lines with stable dwarf3 mutations

Abstract

‘PU305’ (Reg. no. GP‐953, PI 705594), ‘PU306’ (Reg. no. GP‐954, PI 705595), and ‘PU307’ (Reg. no. GP‐955, PI 705596) are sorghum [ Sorghum bicolor (L.) Moench] parent lines released by Purdue University in 2025. They were developed at the Agronomy Center for Research and Education (ACRE), West Lafayette, IN. PU305 (experimental no. 20WL7228), PU306 (experimental no. 20WL7221), and PU307 (experimental no. 20WL7233) carry novel dwarf3 alleles that confer height stability without negatively affecting agronomic performance or yield potential. These lines were developed by introgressing stable dwarf3 alleles from SC124, SC134, and SC991 into Tx430. SC124, SC134, and SC991 are sorghum conversion lines identified as carrying novel dwarf3 alleles, namely dw ₃ ‐sd3 , dw ₃ ‐sd4 , and dw ₃ ‐sd5 , respectively. Tx430 is an elite pollinator parent that carries the dwarf3 reference allele, dw ₃ ‐ref . PU305, PU306, and PU307 were evaluated for agronomic traits per se and in testcross hybrids at ACRE in 2021 and 2022. PU305, PU306, and PU307 were comparable to Tx430 in flowering times and plant heights. Field trials of the testcross hybrids also demonstrated similar flowering times and plant heights, with yield potential ranging from 9.2 to 10 t/ha, comparable to those of the hybrid check (A03MN952 × Tx430). The restorer lines (R‐lines) PU305, PU306, and PU307 provide useful sources of the stable‐dwarf phenotype without any loss of hybrid yield performance.