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a USDA-ARS and Dep. of Crop Science, North Carolina State University, 3127 Ligon Street, Raleigh, NC 27607
b USDA-REE-ARS-NPS-CPPVS, George Washington Carver Ctr., 5602 Sunnyside Avenue, Beltsville, MD 20705-5139
c CSIRO Plant Industry, PO Box 1600, Canberra, ACT 2601, Australia
d Dep. of Plant Sciences, University of Tennessee, 2431 Joe Johnson Drive, Knoxville, TN, 379996-4561
* Corresponding author (joe_burton{at}ncsu.edu)
Soybean [Glycine max (L.) Merr.] germplasm line N984445A (Reg. no. GP-313, PI 636691) was developed and released in 2002 by USDA-ARS, in cooperation with the North Carolina Agricultural Research Service. This line has a concentration of oleic acid in the seed oil that is approximately 550 g kg1. This is between 340 and 380 g kg1 greater than commercial soybean varieties and 47 g kg1 more than the highest oleic acid concentration available in the U.S. germplasm collection. The germplasm will be a useful genetic resource for breeding mid-oleic soybean varieties, that is, those with concentrations of oleic acid between 400 and 700 g kg1. Increased oleic acid in this line causes a correlated decrease in polyunsaturated fatty acids giving the added advantage of linolenic acid concentrations of less than 30 g kg1.
N984445A originated as an F5 single plant selection from the three-way cross N942473 x (N9320074 x N923907). The F2 generation from the cross was grown at Clayton, NC, in 1997. A single F2 plant selection with 531 g kg1 oleic acid was selected for further evaluation as an F2:3 line in 1998. That line, N984445, had an oleic acid concentration of 606 g kg1 and 512 g kg1 when grown at Clayton, NC, in 1998 and 1999, respectively. A single F5 plant with good seed quality and oleic acid concentration of 540 g kg1 was harvested from the 2000 planting of N984445 at Clayton. This F5:6 line (designated N984445A) was seed increased in a winter nursery for germplasm release. Mean oleic acid concentration of N984445A in eight environments in 2003 was 549 g kg1 with a standard deviation of 87 g kg1 (Table 1). The standard Group IV cultivar Mustang (Schmidt et al., 1997) had 238 g kg1 oleic acid in the same environments. Mean yield of N984445A at two North Carolina locations in 2003 was 2122 kg ha1. This was 17% lower than the yield of Mustang in the same tests.
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The maternal parent of the original three-way cross, N942473, was a selection from the cross, N902001 x N89922. N89922 was derived from the cross, N831014 x N852124. Parents of N831014 were the cultivars Gasoy 17 (Baker and Harris, 1979) and N77940. Parents of N852124 were N782245 and PI 123440. Ancestors of N77940 were selected for higher yield and agronomic quality, and the line was used in this pedigree to introduce genetics for higher yield and better adaptation into the oil quality breeding population. The line N77940 was derived from the cross N701549 x D703185. Parents of N701549 were the cultivar Dare (Brim, 1966) and D656765. Parents of D703185 were the line D644636 and the cultivar Lee (Johnson, 1958). The cultivar Hill (Johnson, 1960) and N583311 were parents of D644636. D583311 was a selection from Jackson (4) x D492491 (Johnson, 1958). D492491 is a sister line of Lee. Parents of D656765 were D583358 and D599289. D583358 was a sister line of D853311. D599289 was derived from D514877 x D554168. Parents of D514877 were Roanoke (Weiss, 1953a) and N45745. Parents of D554168 were Ogden (Weiss, 1953b) and Biloxi (PI 548444). N45745 was derived from Ogden x CNS (PI 548445). The maternal parent of N942473 was N902001. It was derived from a cross between N852166 and a selection from the cross, N83375 x N852176. Both N852176 and N852166 were derived from N782245 x PI 123440 (Burton et al., 1989). The line N83375 was derived from N76098 x N76683 and was used as a source of genetics for higher productivity. Parents of N76098 were N701741 and Essex (Smith and Camper, 1973). Parents of N76683 were N701501 and N702173. Both N701741 and N701501 were derived from the cross, Dare x D656765. Hampton (Webb and Hicks, 1965) and Ransom (Brim and Elledge, 1973) were parents of N702173.
The two other parents of N984445A were N9320074 and N923907. N9320074 was selected from a cross between N902013 and C1726 (Wilcox and Cavins, 1990). C1726 is a low palmitic germplasm derived by mutagenesis from the cultivar Century (Wilcox et al., 1980). N902013 is derived from the cross, PI123, 440 x N79207712 (Burton et al., 1994). N79207712 is a low palmitic germplasm derived from the fifth cycle population of the same recurrent selection experiment that N782245 was derived from.
The third parent of N984445A, N923907, was a selection from the cross, N8721224 x 9273 (Rebetzke et al., 1998). N8721224 (Burton et al., 1994) is a low palmitic germplasm derived from a cross between N782245 and N792077. Ancestors of 9273 were selected for improved yield and agronomic quality. Parents of 9273 were 2981 and A3127. 2981 was derived from a cross between S20 and Hark (Weber, 1967). A3127 was derived from a cross between Williams (Bernard and Lindahl, 1972) and Essex. Parents of S20 were L15 and C1423. L15 was derived from the cross Wayne (6) x Clark 63 (Williams and Bernard, 1964; Bernard, 1966). C1423 was derived from C1266R (8) x C1253. Parents of C1266R were Harosoy (Weiss and Stevenson, 1955) and C1079. C1079 was a selection from C985 which was derived from a cross between Lincoln (Weiss, 1953a) and Ogden. C1253 was derived from a cross between Blackhawk (Weiss, 1953a) and Harosoy.
N784445A has group IV maturity. Planted 21 June at Clayton, NC, in 2001, it matured on 3 October, 1 d later than the cultivar Clark (Johnson, 1958). Seed size was 17.0 g per 100 seeds. It has indeterminate growth habit, white flowers, and tawny pubescence. Seeds are shiny yellow with brown hila. Susceptibility to disease is not known. However, moderate levels of Soybean mosaic virus were observed on plants in the 2000 production along with some mottling of harvested seeds.
Small quantities of seed may be obtained from the corresponding author for at least 5 yr. Recipients of seed are asked to make appropriate recognition of the source of the germplasm if it is used in the development of a new cultivar, germplasm, parental line, or genetic stock.
ACKNOWLEDGMENTS
We greatly appreciate the dedicated support personnel Earl Huie, Fred Farmer, and Bobby McMillen who assisted with field testing and seed sampling and Bill Novitzky who performed all oil quality analyses. We thank Grover Shannon, and Bill Kenworthy for their assistance in field testing this genotype. We also thank Connie Bryant for her assistance in preparing and editing this manuscript. The research was supported in part by the United Soybean Board and the North Carolina Soybean Producers Association.
NOTES
Accepted for publication July 31, 2005.
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