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Crop Science 43:1136-1137 (2003)
© 2003 Crop Science Society of America

REGISTRATIONS OF GERMPLASM

Registration of DT98-2448 Soybean Germplasm Resistant to Defoliating Insect Damage

C.A. Abel*,a and J.M. Tylerb

a USDA-ARS Southern Insect Management Research Unit, P.O. Box 346, Stoneville, MS 38776
b Delta and Pine Land Company, P.O. Box 157, Scott, MS 38772

* Corresponding author (cable{at}ars.usda.gov)

DT98-2448 (Reg. no. GP-279, PI 614894) soybean [Glycine max (L.) Merr.] germplasm was released July 2000 by the Agricultural Research Service, United States Department of Agriculture to provide resistance to defoliating insects and improved agronomic performance in the southeastern USA. DT98-2448 is a mid-Maturity Group V, F5–derived selection, from the cross D88-5684 x ‘DP3589’. D88-5684 is derived from D82-3298 x D82-5173. D82-3298 is derived from ‘Bedford’ x a F2 plant derived from the cross ‘Forrest’ x D75-10169 (Hartwig and Epps, 1973, 1978). D82-5173 is derived from ‘Tracy M’ x a F3 plant derived from the cross D71-9241 x D75-10169 (Hartwig, 1980; Hartwig et al., 1984). D71-9241 is a breeding line developed by E.E. Hartwig for resistance to Meloidogyne incognita (Kofoid and White) Chitwood and M. arenaria (Neal) Chitwood (Hartwig et al., 1984). D71-9241 is derived from Semmes x D67-10539. D67-10539 is derived from D63-6094 x D62-7562. D63-6094 is a selection from ‘Hill’ (4) x PI 171442 (Johnson, 1960). D62-7562 is derived from D49-2491 x ‘Laredo’. Laredo is PI 548463, an introduction from China. D49-2491 is derived from S-100 x CNS. D75-10169 is derived from ‘Govan’ x a F4 plant derived from the cross ‘Bragg’ x PI 229358 (Hartwig et al., 1978; and Hinson and Hartwig, 1964). The source of insect resistance carried by DT98-2448 is PI 229358, a Maturity Group VII soybean from Japan (Van Duyn et al., 1971). DP3589 is a commercial cultivar adapted to the clay soils of the lower Mississippi River Valley.

Breeding lines from the cross D88-5684 x DP3589 were advanced by the single seed descent breeding method to the F5 generation (Brim, 1966). In 1998, 200 F5:F6 progeny rows were grown in the field at Stoneville, MS. A natural infestation of soybean looper, Pseudoplusia includens (Walker), beginning at R5 developmental stage (Fehr and Caviness, 1977), facilitated visual ratings for resistance to this insect. Twenty-four lines, including DT98-2448, had less defoliation than susceptible cultivars and were selected.

In 1999, the 24 entries selected as resistant to soybean looper were evaluated for leaf feeding damage by velvetbean caterpillar, Anticarsia gemmatalis Hübner, in a 0.6-ha field cage that excluded indigenous insects. The entries were planted in a randomized complete block design with three replicates. Thirty seeds of each entry were planted in hills. When plants were in the V9 developmental stage, 5000 pairs of velvetbean caterpillar moths with fecund females were released into the cage. The moths deposited a high number of eggs on the test plants and a large larval population developed subsequently. Plants were rated visually when plants of the susceptible checks were at least 90% defoliated. Defoliation of DT98-2448 was similar to that of the resistant source, PI 229358 (53 vs. 50%), and much less than that of susceptible cultivars ‘Bedford’ (93%) and ‘Tracy M’ (93%). In 1999, seed yield of DT98-2448 was compared with that of currently competitive commercial cultivars in an irrigated replicated test on a clay soil at Stoneville, MS. Seed yield of DT98-2448 (3440.6 kg ha-1) was significantly less (P < 0.05) than that of ‘UARK-5798’ (3830.4 kg ha-1) and ‘9594’ (3978.2 kg ha-1) but was not statistically different from ‘DP3589’ (3259.2 kg ha-1).

DT98-2448 is determinate and matures approximately 2 d earlier than ‘DP3589’. It has gray pubescence, a tan pod wall at maturity, and is segregating for flower color and hilum color with an imperfect black and buff hilum. DT98-2448 has small seed size (13.0 g/100 seed) and plant height averages 76 cm compared with 107 cm for ‘DP 3589’. Lodging scores for DT98-2448 and ‘DP3589’ were 3.0 and 2.0, respectively, on a 1-to-5 scale with 5 indicating severe lodging.

This germplasm represents an improved parental source for breeders and is not intended for use as a cultivar. Five hundred seed of DT98-2448 will be distributed for at least 5 yr from the date of this publication on written request and with agreement to make appropriate recognition when this germplasm contributes to the development of a new cultivar or germplasm. Requests for seed should be directed to Mr. Gary Shelton, USDA-ARS, P.O. Box 345, Stoneville, MS 38776.

NOTES

Registration by CSSA.

Accepted for publication October 31, 2002.

REFERENCES





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