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a Dep. of Agronomy
b USDA-ARS, Dep. of Botany and Plant Pathology, Purdue Univ., Lilly Hall, 915 W. State St., West Lafayette, IN 47907-2054
* Corresponding author (leroya{at}purdue.edu).
The soybean [Glycine max (L.) Merr.] cultivars ‘CL0J173-6-2’ (Reg. No. CV-490, PI 643394) and ‘CL0J173-6-8’ (Reg. No. CV-491, PI 643395) were developed cooperatively by the Purdue University Agriculture Research Programs and the USDA-ARS and were released in June 2005 because of their high seed yield in Indiana. These lines have good yield potential combined with above average seed protein and were developed for the non-GMO soybean market without tolerance to glyphosate [N-(phosphonomethyl)glycine] herbicide. Comparisons between these two lines show that CL0J173-6-2 is taller and has more seed protein than CL0J173-6-8 while CL0J173-6-8 is the higher yielding line.
CL0J173-6-2 and CL0J173-6-8 are F6 plant selections from CL0J173-6, an F3 plant selection from the cross Kottman x Dwight (St. Martin et al., 2001; Nickell et al., 1998). The cross was made in the field at West Lafayette, IN in the summer of 2000, and the F1 generation was grown in a greenhouse in the fall of 2000. The F2 population was grown in a greenhouse in the winter and spring of 2001. The F2 population was advanced to the F3 generation by the single-pod bulk method (Fehr, 1987). The F3 population was grown in the West Lafayette, IN nursery, and individual plants were threshed in the fall of 2001. F3:4 plant rows were evaluated in Argentina in 2001–2002. Single-plant row CL0J173-6 was selected, bulked, and evaluated in replicated yield trials in Indiana in 2002 and 2003. CL0J173-6 was evaluated regionally at 11 locations in the USDA Uniform Preliminary Test IIIA in 2003 (Abney and Crochet, 2003) and at 18 locations in the Uniform Test III in 2004 (Abney and Crochet, 2004). CL0J173-6-2 and CL0J173-6-8 were selected as single plants from the F3:6 generation of CL0J173-6 grown in the West Lafayette, IN nursery in the summer of 2002. CL0J173-6-2 and CL0J173-6-8 were evaluated as F6-derived lines in replicated yield trials in Indiana and Illinois, 2003 to 2005.
In regional tests (Abney and Crochet, 2003, 2004), CL0J173-6 (the mother-line of CL0J173-6-2 and CL0J173-6-8) had similar yield to the maturity group III check ‘IA3023’, with 1 d later maturity, 5 cm shorter plant height, and 0.2 units less lodging. In these same tests, CL0J173-6 averaged 27 g kg–1 more seed protein and 10 g kg–1 less seed oil than ‘IA3023’. Across 6 environments of field tests in 2004, CL0J173-6 displayed moderate resistance to sudden death syndrome (SDS) caused by Fusarium solani f.sp. glycines Roy ( = Fusarium virguliforme O'Donnell & T. Aoki) (Schmidt and Schmidt, 2004).
In Indiana and Illinois tests (2004 and 2005, three locations per year) seed yield of CL0J173-6-2 was 4% less and CL0J173-6-8 was 1% greater than Asgrow AG3201, a widely grown cultivar in Indiana at the time. In these tests, the seed protein of CL0J173-6-2 was 20 g kg–1 greater and the seed protein of CL0J173-6-8 was 15 g kg–1 greater than AG3201. Seed oil levels of CL0J173-6-2 and CL0J173-6-8 compared to AG3201 were 7 and 4 g kg–1 less, respectively. In these tests, CL0J173-6-2 had 5 cm taller plant height than CL0J173-6-8.
Both CL0J173-6-2 and CL0J173-6-8 are indeterminate in growth habit and are classified as early Group III maturity (relative maturity 3.0). They have white flowers, light tawny pubescence, and tan pods at maturity. Seeds are dull yellow with black hila. Hypocotyl inoculation with a series of isolates of Phytophthora sojae Kaufmann & Gerdeman demonstrated that CL0J173-6-2 and CL0J173-6-8 both carry the Rps3 gene for race-specific resistance to Phytophthora root and stem rot.
Breeder seed of CL0J173-6-2 and CL0J173-6-8 was distributed to Ag Alumni Seed, 702 State Road 28 East, P.O. Box 158, Romney, IN 47981 for production of Foundation seed in 2005. The lines are released to seed producers by a non-exclusive license for production and sale as a brand. Small amounts of seed for performance testing are available from Ag Alumni Seed through a Material Transfer Agreement (MTA). Permission to cross with these lines and seed for breeding purposes may be granted from the corresponding author and Purdue University until 2013 at which time seed will be distributed freely from the National Plant Germplasm Sysytem without restrictions regarding breeding usage.
Acknowledgments
The authors thank the Indiana Soybean Board for financial support in the development of these germplasm lines through funding from ISB Projects 03-281, 04-291, and 05-303.
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 September 14, 2006.
References
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