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REGISTRATIONS OF GENETIC STOCKS

Registration of MD 17 Fiberless Upland Cotton as a Genetic Stock

USDA-ARS Crop Genetics and Production Research Unit, P.O. Box 345, Stoneville, MS 38776

* Corresponding author (rturley{at}ars.usda.gov)

MD 17 (Reg. no. GS-2, PI 616493) upland cotton, Gossypium hirsutum L, was produced by the Crop Genetics and Production Research Unit, Stoneville, MS, as part of an ongoing multidisciplinary approach to understand the complex genetics of lint percentage and to identify specific genes involved in the expression of this important yield component. MD 17 originated from a single plant selection made from the F₂ progeny of a cross between two accessions, 143 and 243, of the Mississippi Obsolete Variety Collection (MOVC) (Percival, 1987). Accession 243 expresses the dominant naked seed allele N₁N₁ and accession 143 expresses the recessive naked seed allele n₂n₂. Progeny of the selected double mutant (N₁N₁n₂n₂) F₂ individuals were reselected on an individual plant basis. Seed from uniformly expressing F₄ and F₅ populations were bulk harvested. The F₅ population had completely fiberless cottonseed, was uniform in plant height, flowering and boll opening, and was homozygous for the expression of petal spot (R₂R₂) (Percy and Kohel, 1999).

Expression of the naked seed alleles in the accessions 143 and 243 is characterized by ovules which initiate lint fiber, but lack fuzz fiber (Endrizzi et al., 1985). The same biochemical mechanism which prevents fuzz fiber initiation also may inhibit lint fiber initiation. Lint production appears to be influenced negatively by the N₁ and n₂ alleles with lint percentage of 25.6% for accession 143 (National Genetics Resources Program, 2001a) and 11.4% for accession 243 (National Genetics Resources Program, 2001b). However, MD 17, presumably containing N₁N₁n₂n₂ alleles, is completely devoid of fuzz and lint fibers. Other fiberless lines which have been reported in the literature are SL 1-7-1 (Ruan and Chory, 1998; Ruan et al., 2000; Turley and Ferguson, 1996), MU 5 fiberless (Nadarajan and Rangasamy, 1988, 1997), and 9SO x HG (Joshi et al., 1985, 1988). Mu 5 reportedly does not contain N₁N₁ thus its fiberless trait is conditioned by at least one gene not found in MD 17 (Nadarajan and Rangasamy, 1988, 1997). No information was found in the literature on the development or genotypes of 9SO x HG or SL 1-7-1. Two advantages of MD 17 compared with other fiberless lines are that the genotype of MD 17 is known and the parental accessions can be obtained easily from the USDA National Plant Germplasm System [National Collection of Gossypium Germplasm. USDA-ARS, 2765 F and B Rd., Southern Crop Research Laboratory, Crop Germplasm Research Unit, College Station, TX. (percival{at}tamu.edu)]. MD 17 should interest geneticists, plant physiologists, biochemists, molecular biologists, and other scientists with research interest in the development of lint percentage, trichome development, or fiber initiation.

Seed will be maintained by the author. Small quantities of seed are available upon request.

NOTES

Registration by CSSA.

Accepted for publication October 31, 2001.

REFERENCES

• Endrizzi, J.E., E.L. Turcotte, and R.J. Kohel. 1985. Qualitative genetics, cytology, and cytogenetics. In R.J. Kohel and C.F. Lewis (ed.) Cotton. ASA, Madison, WI.
• Joshi, P.A., J. McD. Stewart, and E.T. Graham. 1985. Localization of glycerophosphatase activity in cotton fiber during differentiation. Protoplasma 125:75–85.
• Joshi, P.A., J. McD. Stewart, and E.T. Graham. 1988. Ultrastructural localization of ATPase activity in cotton fiber during elongation. Protoplasma 143:1–10.
• Nadarajan, N., and S.R. Rangasamy. 1997. Breeding value of a fuzzless-lintless mutant in Gossypium hirsutum L. Indian J. Genet. 57:233–237.
• Nadarajan, N., and S.R. Rangasamy. 1988. Inheritance of the fuzzless-lintless character in cotton (Gossypium hirsutum). Theor. Appl. Genet. 75:728–730.
• National Genetic Resources Program. 2001a. National Plant Germplasm System - NPGS [Online]. PI 528543. Available at http://www.ars-grin.gov/cgi-bin/npgs/html/obs.pl? 1423479; verified 10 Dec. 2001.
• National Genetic Resources Program. 2001b. National Plant Germplasm System - NPGS [Online]. PI 528610. Available at http://www.ars-grin.gov/cgi-bin/npgs/html/obs.pl? 1423546; verified 10 Dec. 2001.
• Percival, A.E. 1987. The national collection of Gossypium germplasm. Southern Cooperative Series Bull. 321.
• Percy, R.G., and R.J. Kohel. 1999. Qualitative genetics. p. 319–360. In C.W. Smith and J.T. Cothren (ed.) Cotton: Origin, history, technology, and production. John Wiley and Sons, Inc., New York.
• Ruan, Y.L., and P.S. Choury. 1998. A fiberless seed mutation in cotton is associated with lack of fiber cell initiation in ovule epidermis and alterations in sucrose synthase expression and carbon partioning in developing seeds. Plant Physiol. 118:399–406.[Abstract/Free Full Text]
• Ruan, Y.L., D.J. Llewellyn, and R.T. Furbank. 2000. Pathway and control of sucrose import into initiating cotton fibre cells. Aust. J. Plant Physiol. 27:795–800.
• Turley, R.B., and D.L. Ferguson. 1996. Changes in ovule proteins during early fiber development in a normal and a fiberless line of cotton (Gossypium hirsutum L.). J. Plant Physiol. 149:695–702.

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