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CROP REGISTRATIONS 1417

Registration of *TN6-90' Soybean'T N 6-90' soybean [Glycine max (L.) Merr.] (Reg. no. CV-308, PI 564999) w as developed by the Tennessee AgriculturalExperiment Station. TN 6-90 w as released in 1990 because ofits high yield potential an d good disease resistance.TN 6-90 w as derived from a F 5 plant selected from th e cross'Asgrow 5474'/TN82-94. Asgrow 5474 is a proprietary cul-tivar of Asgrow Seed Company. The line TN82-94 was se-lected from th e cross 'Essex' (5)// 'Bay' (2)/N73-520. Thepedigree of the line N73-520 is 'Tracy' (3)/'Ransom' (1). TN6-90 w as tested in Tennessee an d other Southern states fo rseed yield, agronomic performa nce, an d disease an d nematodereaction from 1987 through 1990 under the experim ental des-ignation TN87-198. It was evaluated in the Uniform SoybeanTests, Southern Region, Preliminary Group VI in 1989 an dUniform Gro u p VI in 1990.TN 6-90 is a Maturi ty Group VI cultivar that ha s determi-nate growth habit, tawny pubescence, white flowers, and tanpo d walls. Seeds ar e yellow with dull seed coat lustre an dimperfect black hila and average 13.9 g 100~' seed. The seedqua l i ty , plant height , an d maturity ar e s imilar to 'Leflore' (4).Th e protein content is similar to that of Leflore (41.7%); whereasthe oi l content (20.2%) is approxima tely 1.1% higher thanLeflore. Yield of TN 6-90 w as approximately 10 % higher thanLeflore in Uniform Soybean Tests, Southern Region, during1989-1990 and 12% higher in tests conducted in Tennessee.TN 6-90 has resistance to stem canker [caused by Diaporthephaseolorum (Cooke & Ellis) var. caulivora Athow & Cald-

well] and to Race 3 of the soybean cyst nematode (Heteroderagfycines Ichinohe). It is resistant to soybean m osaic virus (SMV)an d moderately resistant to frogeye leaf spot (Cercospora so -j ina K. H ara). TN 6-90 is susceptible to sudden death syn-drome [caused by Fusarium solani (Mar t . ) Sacc.].Breeder seed of TN 6-90 was released to the foundationseed organization in Tennessee in 1991. Breeder seed of TN6-90 will be m aintain ed by the Tennessee A gricultural Exper-iment Station. Seed of TN 6-90 fo r research purposes can beobtained from th e corresponding autho r for at least five years.F.L. ALLEN,* D.M. P A N T E R , AN D L.D. Y O U N G (6 )

REGISTRATION OF GERMPLASMRegistration of Tift #5 S-l Pearl MilletGermplasmTI F T #5 s-1 P E A R L M I L L E T [Pennisetum glaucum (L.) R.Br. Subsp. monodii (Maire) Brunken (a weedy rela-tive of pearl millet)] germ plasm (Reg no. GP-29, PI564586) was developed cooperatively by the USDA-ARSan d th e University of Georgia, Coastal Plain ExperimentStation, Tifton, GA. It was released by the two agenciesin March 1992.Tift #5 S-l is a bulk of equal quantit ies of seed from11 4 accessions (1 ) originating from Senegal, Mali, an dNiger. Seeds were bulked from >30 sibbed plants fromeach accession growing in the field. Bulked seed were

dried to 10% moisture, an d stored in an air-tight con-tainer at 5 C.Tift # 5 germplasm is comprised of accessions withgenes for resistance to rust caused by Puccinia substriataEllis & Barth. var ind ica Ramachar & Cummins, leafspot caused by Pyricularia grisea (Cooke) Sacc., smutcaused by Moesziomyces penici l lar iae (Bref.) Vanky,an d downy mildew caused by Sclerospora graminicolaSacc. Schroet. Nineteen of 22 accessions tested in Sen-egal (West Africa) were resistant to downy mildew. Eightof 33 accessions tested for sm ut resistance were resistantat Tifton. A sample of >1000 plants from the bulkedpopulation segregated for 32% and 86% rust an d leafspot resistant plants, respectively. It has genes for in-creased forage yield an d cytoplasmic-genic m ale steril-

ity. Mean dr y matter yield of 55 accessions crossed withTift 85DA w as 12,483 kg h a - 1 with a range of 5568 to15,178 kg h a - 1 (LSD (0.05) = 1665 kg ha-1). Drymatter yield of 'Gah i 3', the control, w as 12840 kg h a -1 .Twe nty-six of 38 accessions backcrossed (BC) to Tift23B were cytoplasmic-nuclear male sterile by the BC 4generation. Although not tested, this germplasm mayhave genes controlling drought tolerance because thissubspecies is among th e last three or four species tosurvive at the edge of the Sah ara Desert . This subspeciesreadily crosses with pe arl millet and this germplasm pos-sesses valuable genes for improving pearl millet; how-ever, Tift #5 S- l germplasm is representative of thisweedy relative and has some undesirable characteristicssuch as seed shattering, small seed size, and smallinflorescences.Seed of Tift #5 S-l m ay be obtained from th e corre-sponding author as long as the 8-kg seed supply lasts.Recipients of seed are asked to make appropriate rec-ognition of the source of the germplasm if it should con-tribute to the development of a new germplasm, parentalline or cultivar.W. W. HANNA,* J.P. WILSON, H.D. WELLSA N D S.C. GUPTA (2)

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1418 CROP SCIENCE, VOL. 33, NOVEMBER-DECEMBER 1993

Registration of TxAG-6 and TxAG-7 PeanutGermplasm LinesTw o P E A N U T (Arachis hypogaea L.) germplasm l inesTxAG-6 (Arachis sp.) (Reg. no . GP-63, PI 565287)an d TxAG-7 (A . hypogaea backcross hybrid with TxAG-6) (Reg. no. GP-64, PI 565288) are interspecific hybridderivatives with disease resistance. Both were releasedby the Texas Agricultural Experiment Station in 1992.These two germplasm lines have high resistance to root-

knot nematode \Meloidogyne arenaria (Neal) Chitwood]populat ions from across the southern US (1,5). TxAG-6 has vi r tual imm uni ty to early and late leafspot [Cer-ospora arachidicola S. Hori an d Phaeoisariopsis per-sonata (Berk. & M.A. Curtis) Arx], and TxAG-7 hasmoderate resistance to early leafspot and good resistanceto late leafspot.These tw o germplasm lines were developed by inter-specific hybridization within th e Arachis genus, sect. A r-achis nom. nud. TxAG-6 was derived by crossing theA-genome (4 ) diploid hybrid from A . cardenasii Krap.et Greg. nom.nud. (GKP-10017, PI 262141) x A . cha-coens is Krap. et Greg. nom.nud. (GKP-10602, PI 276235)as male on to the B-genome (4) species A. batizocoiKrap. et Greg. (K-9484, PI 298639) female. This steriletri-species hybrid was subsequently chromosome dou-bled with colchicine, forming th e fertile amphiploid,designated as TP-129 (3), an d released as TxAG-6.TxAG-7 w as derived by crossing TP-129 with th eFlorida line UF-439-16-10-3-2 [a comp onent l ine of A.hypogaea L. cv. 'Florunner' (2)] as female. T he four-species F] com plex hy brid was then backcrossed to theUF-439-16-10-3-2 female, producing a populat ion ofBC,F! plants, one of which was designated TP-135-4(3), now named TxAG-7.TxAG-6 and TxAG-7 have been crossed and back-crossed extensively (3, and unpublished data, 1983-1993)with a wide range of A . hypogaea genotypes an d havebeen found to be cross compatible in almost all attempts.Nematode resis tance of the l ines has been documentedby Nelson et al. (1) and Starr et al. (5). The leafspotresistance has been confirmed by Simpson an d Woodard(unpublished data , 1985-1992).It is emphasized tha t these lines were released fo r theirbreeding potential fo r resistance, no t productivity. TxAG-6 is an amphiploid derivative that is highly uniform inall characters. Its seeds ar e very small (13 g 100"1),contained in single segmented pods, and the plants ar eprostrate, sparsely branched, with a mainstem height of30 to 40 cm. Seed color of TxAG-6 is brown/tan [RoyalHorticultural Society (RHS) 175 to 177] with an occa-sional re d seed (RHS-179A), flower color is yellow, an dth e leaves ar e dark green.TxAG-7 is less uniform than TxAG- 6 . Extensive test-ing of various seeds of TxAG-7 have shown tha t ap -proximately one in five plants will not carry genes fo r

nematode resistance. Mature seeds of TxAG-7 are red-dish-brown (RHS-178B), an d small (27.7 g 10Q-1). Mostpods are single segmented. The plants are prostrate withmoderate to extensive branching an d dark green in color.Flowers are orange.Potential users of these germplasm l ines need to beaware that th e seeds to be distributed of TxAG-6 an dTxAG-7 are directly from the TP-129 an d TP-135-4 plantswhich are m aintaine d vegetatively. T here will be no in-breeding or segregation of the two germplasm lines overt ime.These tw o germplasm l ines wil l be useful in peanutvariety development programs which ar e breeding fo rresistance to root-knot nematode and the leaf spots. Seedof the two lines will be available to requesting research-er s from th e corresponding author. Five seed of ei theror both lines will be sent upon receipt of a letter ofagreement to acknowledge th e source of the mater ia l inany subsequent publ icat ion(s) pertaining to the sourcesof resistance.

C.E. S I M P S O N , * S.C. N E L S O N , J.L. S T A R R ,K.E. W O O D A R D , AN D O.D. S M I T H (6)

Registration of LN KY 171 and LN KY 160Germplasm Lines of Low Nicotine Tobacco

LN KY 171 (Reg. no. GP-46, PI 564065) and LN KY16 0 (Reg. no . GP-47, PI 564066) dark tobacco (Ni-cotiana tabacum L.) germplasm lines were released bythe Kentucky Agricultural Experiment Station in 1992for their very low nicotine content. The lines are genet-ically stable and were developed by transferring genesfor lo w nicotine, as identified by Legg et al. (1), fromLA Burley 21 (2) into th e fire-cured cultivar, KY 171,an d the air-cured cultivar, KY 160. The breeding pro-cedure was the backcross method and LN KY 171 andLN KY 160 were identified as homozygous lines in theBC 5S 2 generat ion.In performance t r ials for 3 yr, LN KY 171 and LNKY 160 were comparable for morphological and agro-nomic t rai ts to KY 171 and KY 160, respectively. N i-