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a Univ. of Missouri-Delta Center, P.O. Box 160, Portageville, MO 63873
b Division of Plant Sciences, 271-F Christopher S. Bond Life Sciences Center, Univ. of Missouri, Columbia, MO 65211
* Corresponding author (shannong{at}missouri.edu).
‘Stoddard’ soybean [Glycine max (L.) Merr.] (Reg. No. CV-487, PI 643911) was developed by the Missouri Agricultural Experiment Station at the University of Missouri-Delta Center, Portageville, MO, and released 3 Feb. 2006. It was released because of its high yield potential, broad resistance to soybean cyst nematode (SCN, Heterodera glycines Ichinohe) populations, resistance to southern root knot nematode [Meloidogyne incognita (Kofoid and White) Chitwood] and resistance to sudden death syndrome (SDS) [caused by Fusarium solani (Mart.) Sacc. f. sp. glycines Roy].
Stoddard, tested as S00-9925-10, is early Group V maturity (RM 5.1). It is an F5 single plant selection composited in the F6 generation from the cross K1393 x ‘Anand’ (Anand et al., 2001) made in 1997. K1393 is from ‘KS 5292’ (Schapaugh and Todd, 1998) x ‘Hutcheson’ (Buss et al., 1988). The F1 generation was grown in Puerto Rico. The F2 to F4 generations were advanced alternately in the SCN nursery at the University of Missouri Rhodes Farm near Clarkton, MO, and in Puerto Rico, respectively by the bulk pod method. The bulk pod method we used involved harvesting a single three-seeded pod from each of up to 500 plants in each generation, and then bulked seed from harvested pods was planted to advance the next generation.
The F5 generation was grown in Costa Rica during the winter and spring of 2000, and 100 single plants were harvested, threshed individually, and planted in F6 progeny rows in the SCN nursery at Clarkton during the summer of 2000. The F6 row S00-9925-10 was uniform for agronomic traits, bulked and tested in southeast Missouri for yield, agronomic, and disease traits from 2001 to 2005. Stoddard was also tested in the Southern Regional Uniform Preliminary Group IVS test in 2002 and Uniform Group IVS test in 2003 to 2005. Yields of Stoddard have averaged 200 to 400 kg ha–1 more than ‘Manokin’ (Kenworthy et al., 1996) on sand, loam, and clay soil types in 25 southeast Missouri tests. Yields for Stoddard have been similar in Missouri to the high yielding variety ‘5002T’ (Pantalone et al., 2004). In comparison to 5002T in the Uniform Tests-Southern States across 3 yr and 43 locations (Paris and Bell, 2004, 2005; Paris and Shelton, 2006), Stoddard averaged 1% less in seed yield (5002T yielded 3480 kg ha–1); the same maturity (5002T matured 2 October); more lodging with a score of 2.3 versus 1.8 for 5002T based on a scale of 1 to 5 (with 1.0 being erect and 5.0 lodged flat); 3 cm taller (5002T was 71 cm); and 1.5 g 100 seeds–1 smaller seed (5002T was 14.6 g 100 seeds–1).
Plants of Stoddard have a determinate growth habit with white flowers, tawny pubescence, and tan pods at maturity. Seeds are shiny yellow with black hila. Seed protein and oil content on a dry weight basis have averaged 39.6 g kg–1 and 19.8 g kg–1, respectively compared to 40.6 g kg–1 and 20.5 g kg–1 for 5002T. It has shown a similar reaction to SCN HG types (races) as Anand. Stoddard has shown moderate resistance to SCN HG type 2.5.7 (Race 1), HG type 1.2- (Race 2), HG type 0 (Race 3), HG type 2- (Race 5), and HG type 1.3- (Race 14) in greenhouse tests at Portageville, MO, and Columbia, MO, in 2003 and 2005. Average SCN female indexes on Stoddard for each HG type above were 23, 1, 15, 1, and 1, respectively based on a SCN female index of 100 for the susceptible check (Niblack et al., 2002). In the same tests female indexes for Anand for each HG type averaged 19, 3, 13, 1, and 3, respectively. Stoddard has shown moderate resistance to root knot nematode in 4 yr of testing (2002–2005) in plantings after potatoes (Solanum tuberosum L.) near Bertrand, MO. It is moderately resistant to SDS and stem canker caused by [Diaporthe phaseolorum (Cooke and Ellis) Sacc. var. meridionales F.A. Fernandez]. It is susceptible to phytophthora root rot (caused by Phytophthora sojae M.J. Kaufmann & J.W. Gerdemann).
Foundation Stoddard seed was distributed to Missouri growers in 2006. A royalty of one cent per pound will be collected on certified seed sold. Royalties collected outside the state of Missouri by participating states will be shared 70/30 between Missouri and the participating state, respectively. The University of Missouri has applied for Plant Variety Protection for Stoddard. No seed will be distributed without written permission by the University of Missouri for 20 yr (from the date of publication in Journal of Plant Registrations), at which time seed will also be available from the National Plant Germplasm System (NPGS). Small quantities of seed for research purposes and biparental crossing may be obtained from the corresponding author for at least 5 yr.
Footnotes
All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher.
Received for publication May 25, 2006.
References
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