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REGISTRATIONS OF PARENTAL LINES

Registration of NM-6R₁, a Dwarf Grain Pearl Millet Inbred Restorer Line

Dep. of Agronomy, Univ. of Nebraska, P.O. Box 830915, Lincoln, NE 68583-0915

* Corresponding author (dandrews2{at}unl.edu)

Dwarf grain pearl millet [Pennisetum glaucum (L.) R. Br.) inbred male fertility restorer R-line NM-6R₁ (Reg. no. PL-42, PI 613116) was released by the Institute of Agriculture and Natural Resources, University of Nebraska, Lincoln, NE, in May 1998. NM-6R₁ is a relatively early dwarf, stiff stalk line that fully restores male fertility on A₁ (Burton, 1958) cytoplasmic-nuclear male sterile (CMS) seed parents.

NM-6R₁ (90PV0086R) was selected at the Department of Agronomy Farm at the University of Nebraska's Agricultural Research and Development Center (ARDC), Mead, NE, in 1984 out of row 84105-1222-1 of segregating germplasm obtained in the late 1970s from Dr. A.J. Casady, Kansas State University. The germplasm had undergone random mating and selection for at least three cycles prior to 1984 and, while no specific ancestral information is available, the Casady germplasm probably involved African germplasm from the pearl millet breeding program at Serere, Uganda, and a source of the d₂ dwarfing gene from USDA-ARS at Tifton, GA. The 1984 selection was planted in the 1986 ARDC nursery, and a selection was test crossed to KS 79-2068A₁ (a CMS A-line from W.D. Stegmeier, Kansas State University, Hays, KS). KS 79-2068 was derived from PI185642, an introduction from the large-seeded photo-insensitive Iniadi landrace from Ghana, West Africa. A 1986 selection showed restoration of male fertility in the testcross, and selfed plant selection was continued for four more generations to identify an inbred selection, 90PV0086R, in the 1990 Puerto Vallarta, Mexico, winter nursery which provided complete restoration in A₁ CMS testcrosses and complete seed set when selfed. Pedigree selection for shorter plant height and testcrossing was continued to the S₁₀ generation. Test crosses to CMS Tift 23DA₄E₁ in 1992 showed NM-6 to be a maintainer of A₄ (Hanna, 1989) cytoplasmic male sterility.

NM-6R₁ is a medium-early, dwarf, near synchronous tillering inbred that averages 78 to 92 cm in height at maturity and flowers 57 to 63 d after early- to mid-June plantings at Lincoln, NE. NM-6R₁ has yellow anthers, sheds pollen profusely, and has elongate shaped, light gray seeds (8.0 g per 1000 seed). NM-6R₁ has thin, compact, pencil-shaped panicles (20 to 22 cm in length) and panicle exertion of 10 to 15 cm with a stiff peduncle and stalk. NM-6R₁ produces 1 to 2 tillers per plant which are upright in habit at high and low planting densities.

The main advantages of NM-6R₁, as a pollen parent are its medium-early maturity, dwarf stature, profuse pollen production, and complete restoration of male fertility in the A₁ cytoplasm. Yield performance tests from 1995 to 1997 in a limited number of hybrid combinations indicated that NM-6R₁ has good combining ability for grain yield with several early and medium-maturity seed parents across a wide range of environments. Yields of individual hybrids with this pollinator in 1995 to 1997 regional tests conducted in five to seven states, ranged from 1330 to 6470 kg ha^-1. Lodging evaluation of NM-6R₁ hybrids indicate the stiff stalk trait reduces lodging in the midwestern environments and could be useful in future hybrid combinations.

NM-6R₁ is available for research purposes through the Department of Agronomy, University of Nebraska, Lincoln, NE 68583.

NOTES

Research funded in part by USAID Grant No. LAG-G-00-96-900090-00 through INTSORMIL, the International Sorghum and Millet CRSP. Journal Article No. 12947 by Univ. of Nebraska Agric. Res. Div. Registration by CSSA.

Accepted for publication May 1, 2002.

REFERENCES

• Burton, G.W. 1958. Cytoplasmic male-sterility in pearl millet Pennisetum glaucum (L.) R. Br. Agron. J. 50:230.
• Hanna, W.W. 1989. Characteristics and stability of a new cytoplasmic-nuclear male sterile source in pearl millet. Crop Sci. 29:1457–1459.[Abstract/Free Full Text]

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