Submitted to: Germplasm Release
Publication Type: Germplasm release
Publication Acceptance Date: 10/23/2006
Publication Date: 11/14/2006
Citation: Jenkins, J.N., MCcarty Jr., J.C., Hayes, R.W., Creech, R.G., Creech, J.B., Haire, D.L. 2006. Notice of release of six root-knot nematode resistant upland cotton germplasm lines. USDA and Mississippi Agricultural and Forestry Experiment Station Germplasm Release. 11/14/2006. 3 p. Interpretive Summary: Germplasm release, interpretive summary not required.
Technical Abstract: Mississippi Agricultural and Forestry Experiment Station, The Agricultural Research Service, United States Department of Agriculture, and Cotton Incorporated Cary, NC, announce the release of six germplasm lines of upland cotton, MS-01RKN, MS-24RKN, MS-30RKN, MS-33RKN, MS-35RKN, and MS-37RKN that have good yield and fiber quality combined with resistance to root-knot nematode (RKN). The nematode resistance is from the Auburn 634 source. These lines provide public and private breeders with germplasm resources with resistance to root-knot nematode and acceptable yield and fiber quality for the mid-south and southeastern United States. All six lines were developed using M240 RNR as the nematode resistant parental line and it was crossed one or more times with different commercial cultivars or released elite breeding lines followed by selection. The pedigrees are: MS-01RKN = SG404/(M240/SG501); MS-24RKN = (M240/SG125)/SG125: MS-30RKN = DES211-39/(M240/SG125); MS-33RKN = SG501/(M240/SG125): MS-35RKN =(DES119/M240)/DES119; MS-37RKN = (DES119/M240)/DES119 Performance data over four environments for yield evaluations and two greenhouse RKN evaluations show that the RKN gall index for the six lines ranged from 2.0 to 2.7 whereas the gall index on the RKN resistant check M315 was 1.8, the susceptible RKN check M8 was 4.0, and the resistant cultivar check Acala Nemx was 2.5. Each of the six lines had significantly less wilted plants (2-12%) than Rowden (48-63%), the susceptible check cultivar, in the Tallassee, AL, RKN/Fusarium Wilt Nursery in 2005. Yield and yield components on the six lines were equal to or better than Stoneville 474 (ST 474), the Agronomic Cultivar check. Boll size for the lines ranged from 4.96 to 5.27g, with ST474 being 4.82g. Four lines had significantly heavier bolls than ST 474. Lint percentage for the lines ranged from 40.3 to 42.1% with ST 474 being 43.6%. All lines had lint percentage significantly lower than the high lint percentage cultivar ST 474. Lint yield ranged from 827 to 1016 kg/ha with ST 474 being 858. No line was significantly different in yield from ST 474. Fiber properties (HVI) were equal to or superior to ST 474. Micronaire ranged from 4.9 to 5.1, with ST 474 at 5.3. All lines had significantly lower micronaire than ST 474. Fiber length ranged from 28.3 to 29 mm with ST 474 at 28.6. No lines had fiber length significantly different from ST 474. Strength ranged from 279 to 303kNm/kg with ST 474 being 286kNm/kg. One line (MS-35RKN) had significantly greater fiber strength than ST 474.