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a LSU AgCenter, Dep. of Agronomy & Environmental Management, 104 MB Sturgis Hall, Baton Rouge, LA 70803
b LSU AgCenter, Red River Research Station, P.O. Box 8550, Bossier City, LA 71113
* Corresponding author (gmyers{at}agctr.lsu.edu).
A breeding line of cotton (Gossypium hirsutum L.), designated as LA1110017 (Reg. No. GP-876, PI 643918) was released in 2006 by the Louisiana Agricultural Experiment Station (LAES). The superior fiber strength and length of this line as well as its favorable micronaire, elongation and fiber length uniformity values makes it valuable to cotton breeding programs looking to improve fiber quality.
LA1110017 was derived from a cross made in 1998 between ‘Paymaster 1560’ and ‘FiberMax 832’. Paymaster 1560 (experimental designation LA830909) originated from a 1980 cross made by Dr. J.E. Jones of the LAES between LA434-1031-C and ‘DES119’ (Bridge, 1986). LA434-1031-C is a reselection of LA434-RKR which originated from a cross between Bayou 7769 and Deltapine 16 (Calhoun et al., 1997). Bayou 7769 is a root-knot nematode-Fusarium wilt resistant selection that traces back to a cross between Deltapine 15 and Clevewilt-6. DES 119 was a release from the Mississippi Agricultural and Forestry Experiment Station (Calhoun et al., 1997). FiberMax 832 is an okra leaf shaped cotton cultivar marketed by Bayer CropScience. LA1110017 was developed via pedigree selection in the F2–F4 generations with primary emphasis given to high fiber length and strength. It was evaluated as a progeny row in 2002 and rouged for purity. Replicated field evaluation was undertaken at the Dean Lee Research Station and Red River Research Station of the LSU AgCenter in 2003 and at additional sites (Macon Ridge Research Station and Northeast Research Station) in 2004–2005 and evaluated for yield, lint fraction and fiber quality. Comparisons were made relative to the commercial cultivars FiberMax 958 and Phytogen PSC 355 in 2003; Deltapine 493, FiberMax 958, and Phytogen PSC 355 in 2004; and Deltapine 493 and FiberMax 958 in 2005. All fiber measurements were made using High Volume Instrumentation (HVI). Phenotypically, LA1110017 has a normal leaf shape, hairy leaves and pubescent stems. It is of medium to full maturity.
Results from the 10 performance trials averaged over 2003–2005 showed that the lint yields of LA1110017 were not significantly different (P = 0.05) to that of FiberMax 958. Lint fraction was significantly lower at 40% than that of FiberMax 958 (43%). The Upper Half Mean (UHM) length was significantly greater (P = 0.05) than that of FM958 (28.4 mm) with an increase of 6% (30.2 mm). The HVI fiber bundle strength of LA1110017 was significantly greater than that of FM958 (P = 0.05) with an average of 340 kN m kg–1, an increase of 16%. The micronaire value of LA1110017 (4.6) was significantly (P = 0.05) lower than that of FiberMax 958 (4.8). Elongation value for LA1110017 (8.07) was significantly greater (P = 0.05) than that of FiberMax 958 (7.11). Uniformity index value for LA1110017 (84.14) was significantly (P = 0.05) greater than that of FiberMax 958 (83.49).
In common tests between LA1110017 and Phytogen PSC355 (PSC355) lint yields were not significantly different (P = 0.05). In common tests with Deltapine 493 (DP493) the lint yield of LA1110017 was 153 kg ha–1 less, significant at P = 0.05. The lint fraction of LA1110017 (40%) was significantly lower than that of PSC355 at 42% and also significantly (P = 0.05) lower than that of DP493 (46%). The fiber length of LA1110017 (30.2 mm) was significantly greater than that of PSC355 (28.2 mm) or DP493 (28.2 mm). The fiber strength of LA1110017 (346 kN m kg–1) was significantly greater than that of PSC355 (317 kN m kg–1) and also of DP493 (291 kN m kg–1). Significantly lower micronaire values existed in LA1110017 than in DP493 and in PSC355. Elongation mean values for LA1110017 were significantly lower in comparison to PSC355 but significantly greater than DP493. Greater fiber length uniformity was evident in LA1110017 than in either PSC355 or DP493 with the highest mean values associated with LA1110017.
LA1110017 provides cotton breeding programs looking to improve fiber quality an improved fiber package, notably in the areas of length and strength. The highly competitive yield of LA1110017 would imply that these traits could be introgressed without a concomitant yield penalty. Small quantities of seed will be available for distribution and may be requested from the senior author. Unless specifically approved by the Louisiana Agricultural Experiment Station, LA1110017 may not be used as a recurrent parent in a breeding program.
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 1, 2006.
References
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