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a Crop, Soil, and Environmental Sciences, Univ. of Arkansas, 115 Plant Science, Fayetteville, AR 72701
b OARDC, Dep. of Horticulture and Crop Science, Ohio State Univ., 1680 Madison Ave., Wooster, OH 44691
c Mertec, LLC
* Corresponding author (pchen{at}uark.edu).
Soybean [Glycine max (L.) Merr.] germplasm line R95-1705 (Reg. No. GP-358, PI 647962) was developed by the Arkansas Agricultural Experiment Station and released as a maturity group V line with high protein content and moderate yield potential.
R95-1705 originated as an F4 plant selection from the cross of ‘Hutcheson’ x BARC-7. Hutcheson (PI 518664) is a widely adapted and high-yielding mid-maturity group V cultivar derived from the cross V68-1034 x ‘Essex’ (Buss et al., 1988). BARC-7 (PI 555397) is a high-protein maturity group IV line derived from the cross CX797-21 x D80-6931 (Leffel, 1992). The cross of Hutcheson x BARC-7 was made in the summer of 1991 at Fayetteville, AR. The plant population derived from Hutcheson x BARC-7 was advanced to the F4 generation by a modified single-seed descent method (Fehr, 1991) from 1992 to 1994. The F4:5 plant rows were grown and R95-1705 was selected from row 1705 of the 1995 progeny row nursery at Keiser, AR. Seeds were bulked as a pure line and the F4:6 line was first tested in 1996 and reevaluated in subsequent years (1997–2006) in Arkansas. R95-1705 was also evaluated in the USDA Southern Regional Preliminary Group V test from 1999 to 2001 (Paris, 1999, 2000, 2001) and in the Regional Quality Traits Tests for maturity group V from 2003 to 2005 (Graef, 2003, 2004, 2005).
R95-1705 was evaluated for protein and oil contents in 22 environments from 1996 to 2006 in Arkansas. Average protein and oil contents of R95-1705 were 467 g kg–1 and 178 g kg–1, respectively (Table 1 ). Protein content of R95-1705 was on average 15% greater than that of Hutcheson (408 g kg–1; Buss et al., 1988), ‘Ozark’ (403 g kg–1; Chen et al., 2004), and ‘5601T’ (408 g kg–1; Pantalone et al., 2003). Oil content of R95-1705 was 16% less than that of maturity group V check cultivars (213 g kg–1) on average. R95-1705 ranked first for protein content in the USDA Southern Regional Preliminary Group V test from 1999 to 2001 (Paris, 1999, 2000, 2001) and in the Regional Quality Traits Tests for maturity group V from 2003 to 2005 (Graef, 2003, 2004, 2005). R95-1705 was evaluated for seed yield in 43 environments in Arkansas. Average seed yield of R95-1705 (3067 kg ha–1) was 13, 16, and 18% less than that of Hutcheson (3524 kg ha–1), Ozark (3665 kg ha–1), and 5601T (3726 kg ha–1), respectively (Table 1).
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U.S. Plant Variety Protection will not be filed for R95-1705 soybean germplasm line. Seed of R95-1705 is available from the Soybean Breeding and Genetics Program at the University of Arkansas, 115 Plant Science Building, Fayetteville, AR 72701. Small quantities of R95-1705 seed will be available for research purposes and cultivar development by request from the corresponding author. It is requested that appropriate recognition be made if this germplasm line contributes to the development of a new germplasm line or cultivar. Seed of R95-1705 will also be deposited in the USDA Soybean Germplasm Collection.
Acknowledgments
Appreciation is extended to Carla Parker and Tina Hart for their technical assistance in evaluation of R95-1705. This research is partially supported by the United Soybean Board.
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 March 10, 2007.
References
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