Date of this Version
Published in Crop Sci. 43:441–442 (2003).
RN582 sorghum [Sorghum bicolor (L.)Moench] germplasm line (Reg. no. GP-591, PI 628277) was developed jointly by the USDA-ARS and the Agricultural Research Division, Institute of Agriculture and Natural Resources, University of Nebraska, and was released in September 2001.
RN582 is an S6 selection from the cross (RTx430 ms3ms3X E 35-1) X E 35-1. RTx430 was developed and released by the Texas Agricultural Experiment Station (Miller, 1984) and was provided to this project containing the nuclear male sterility gene ms3 by A.B. Maunder in 1988. E 35-1 is an Ethiopian land race with white seed, tan necrotic plant color, 2-dwarf in height, late maturing, and was obtained from A. Sotomayor-Rios in 1979. RN582 has tan necrotic plant color (pp__), white pericarp (__yy), thin mesocarp (ZZ), normal (WxWx) white endosperm, no testa (b1b1__) and juicy culms (dd). RN582 has demonstrated high heterotic potential for grain yield with 10% higher yields when crossed to AWheatland than the check hybrid AWheatland X RTx430 over the 3-yr period 1998 to 2000, and 20% higher yields when crossed to ATx631 than the white seed tan plant check hybrid ATx631 X RTx437 in 2001 (Table 1). RN582 is adapted to the northern portion of the U.S. grain sorghum producing region and will reach anthesis 5 d earlier than RTx430 in that environment. RN582 is a strong restorer of fertility in A1 cytoplasm. Fertility reaction in other cytoplasmic sterility systems is not known. Nuclearmale sterility has not been observed inRN582. Performance data for RN582 and its hybrids collected in 1998, 1999, 2000, and 2001 at Ithaca, NE, are presented in Table 1.