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a Louisiana State Univ., AgCenter, Dep. of Agronomy & Environmental Management, 104 MB Sturgis Hall, Baton Rouge, LA 70803
b Louisiana State Univ., 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 LA1110004 (Reg. No. GP-877, PI 643917), was released in 2006 by the Louisiana Agricultural Experiment Station (LAES). LA1110004, an okra leaf germplasm line possessing exceptional fiber strength and length, is a valuable resource for fiber improvement efforts by both public and private breeding programs.
LA1110004 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. LA1110004 was developed via pedigree selection in the F2–F4 generations with primary emphasis given to high fiber length, strength, and the okra leaf phenotype. 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. Phenotypically, LA1110004 possesses the okra leaf shape and has smooth leaves and pubescent stems. LA1110004 is of medium to full maturity.
Results from the 10 performance trials averaged between 2003 and 2005 showed that the lint yield of LA1110004 was not significantly different (P = 0.05) from that of FiberMax 958. The lint fraction for LA11004 at 40.2% was significantly lower than that of FiberMax 958 (42.6%). Upper half mean (UHM) length of LA1110004 was significantly higher (P = 0.05) than that of FiberMax 958, averaging 29.5 mm across the 10 trials. The high-volume instrumentation (HVI) fiber-bundle strength of LA1110004 at 350 kN m kg–1 was 18% higher and significantly greater than that of FiberMax 958. The micronaire value of LA1110004 (4.8) was lower but not significantly different. Elongation values for LA1110004 were significantly greater (P = 0.05) than those of FiberMax 958 and averaged 8.3. The uniformity index value for LA1110004 was slightly and significantly (P = 0.05), greater than that of FiberMax 958.
In eight common tests between LA1110004 and Phytogen PSC355 (PSC355) (2003–2004) or in eight common tests with Deltapine 493 (DP493) (2004–2005), lint yields were not significantly different (P = 0.05). The lint fraction of LA1110004 was comparable to that of PSC355 but was significantly lower than that of DP493. Fiber length for LA111004, at 29.5 mm, was 6% longer and significantly greater (P = 0.05) than that of either PSC355 (27.9 mm) or DP493 (27.9 mm). The fiber strength of LA1110004 averaged 353 kN m kg–1 compared with values of 314 and 284 kN m kg–1 for PSC355 and DP493, respectively. Micronaire values were comparable between LA1110004 and PSC355 and DP493. Elongation values for LA1110004 were slightly lower than those of PSC355 but greater than those of DP493. Greater fiber length uniformity was evident in LA1110004 than in either PSC355 or DP493.
The exceptional fiber strength and length of this line as well as its favorable micronaire, elongation, and fiber-length uniformity values make it valuable to cotton breeding programs looking to improve fiber quality. The yield of LA1110004 would imply that these traits could be introgressed without a concomitant penalty. Small quantities of seed will be available for distribution and may be requested from the senior author. Unless specifically approved by the LAES, LA1110004 may not be used as a recurrent parent in a breeding program.
Footnotes
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Received for publication September 1, 2006.
References
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