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CROP BREEDING, GENETICS & CYTOLOGY

Fiber Length Development in Near-Long Staple Upland Cotton

Dep. of Soil and Crop Sci., Texas A&M Univ., College Station, TX 77843-2474

^* Corresponding author (cbraden{at}ag.tamu.edu).

Advanced Fiber Information System (AFIS) mean fiber length by weight (L_w), fiber length development period (FLDP), and average daily fiber length growth rates (ADGR) were determined for four experimental strains and three cultivars of upland cotton, Gossypium hirsutum L., in 1998 and 1999 in College Station, TX. TAM 94L-25 and TAM 94M-14, near-long staple sib lines developed by the Texas Agricultural Experiment Station (TAES), were compared with five upland cotton genotypes that varied in high-volume instrument (HVI) upper half mean (UHM) fiber length. The FLDP was determined as the number of days postanthesis (DPA) until fibers reached a L_w greater than or equal to their L_w at boll opening. Final average daily growth rate (FADGR) was calculated as the average L_w d^–1 from anthesis to open boll. Length by weight was determined at 3-d intervals from 16 DPA until boll opening. With a higher FADGR and longer FLDP, TAM 94L-25 and TAM 94M-14 exhibited the longest final L_w. TAM 94L-25 had a higher FADGR than the commercial cultivars Suregrow 125 and Tamcot CAMD-E, while TAES strain 94WD-17 exhibited the lowest FADGR. The broad-sense heritability estimate for final L_w across years was 0.88.

Abbreviations: ADGR, average daily growth rate • AFIS, advanced fiber information system • DPA, day(s) postanthesis • FADGR, final average daily growth rate • FLDP, fiber length development period • HVI, high-volume instrument • L_w, length by weight • SADGR, segmented average daily growth rate • TAES, Texas Agricultural Experiment Station • UHM, upper half mean

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