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Title: NOTICE OF RELEASE OF N220-1-91, N222-1-91, N320-1-91, AND N419-1-91 GERMPLASM LINES OF COTTON

Author
item Cook, Charles
item NAMKEN, L - TX AGRIC EXT STN-WESLACO
item Robinson, Arin

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: 1/31/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary: Four germplasm lines of cotton, N220-1-91, N222-1-91, N320-2-91, and N419-1-91, were developed and released by the USDA-ARS and Texas Agricultural Experiment Station. In field tests conducted in reniform nematode-infested plots from 1992-1994 in which the four lines were compared to Stoneville 453 and La. RN 1032, respectively, N220-1-91 averaged ca. 110% and 85% greater yield, N222-1-91 averaged ca. 70% and 50% greater yield, N320-2-91 averaged ca. 85% and 60% greater yield, and N419-1-91 averaged ca. 100% and 75% greater yield. Reniform nematode incited yield reductions for the four germplasm lines were less than 50% of that observed for Stoneville 453. Laboratory reniform nematode multiplication factors at six weeks for N222-1-91, N320-2-91, and N419-1-91 were lower than Stoneville 453. Gall ratings of N220-1-91, N222-1-91, and N320-2-91 were significantly lower than that of Stoneville 453, and multiplication factors were less than 1.0. The four germplasm lines should be a useful genetic source to breeders for developing cotton cultivars with improved resistance to nematodes.

Technical Abstract: Four cotton germplasm lines of cotton were developed and released by the USDA-ARS and Texas Agricultural Experiment Station. Germplasm lines, N222-1-91, N320-2-91, and N419-1-91, possess a high level of tolerance and some resistance to reniform nematodes, and N220-1-91, N222-1-91, and N320-2-91 show strong resistance to race 3 of the southern root-knot nematode. From 1992-1994, the four lines were evaluated in reniform nematode-infested and fumigated field plots. Compared with Stoneville 453 and La. RN 1032, respectively, in the nematode-infested plots, N220-1-91 averaged ca. 110% and 85% greater yield, N222-1-91 averaged ca. 70% and 50% greater yield, N320-2-91 averaged ca. 85% and 60% greater yield, and N419-1-91 averaged ca. 100% and 75% greater yield. Yield reductions caused by reniform nematode for the four germplasm lines were less than 50% of that observed for Stoneville 453. In laboratory studies, reniform nematode multiplication factors for N222-1-91, N320-2-91, and N-419-1-91 at six weeks were lower than Stoneville 453. Gall ratings of N220-1-91, N222-1-91, and N-320-2-91 were significantly lower than that of Stoneville 453, and multiplication factors were less than 1.0. The four germplasm lines should provide a useful source of genetic resistance to nematodes for cotton breeders.