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Title: NOTICE OF RELEASE OF C221-91, C224-91, C300-91, AND C306-91 GERMPLASM LINESOF COTTON

Author
item Cook, Charles
item NAMKEN, L - TX AGRIC EXT STN-WESLACO
item SCOTT, JR, A - RIO FARMS, INC
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 cotton germplasm lines, C221-91, C224-91, C300-91, and C306-91, were developed and released by the USDA-ARS, Texas Agricultural Experiment Station, and Rio Farms, Inc. C224-91, C300-91, and C306-91 produced significantly greater yields than Stoneville 453 and La. RN 1032 in reniform nematode-infested plots, and yield reductions caused by reniform nematodes for the three germplasm lines were less than 50% of that observed for Stoneville 453. Compared to Deltapine 50 in 1992-1994 tests located in southern Tamaulipas, Mexico, first harvest and total lint yields were 26% and 15% greater for C221-91, 36% and 19% greater for C300-91, and 9% and 2% greater for C306-91. In 1992-1994 tests conducted in the Lower Rio Grande Valley and Coastal Bend areas of Texas, lint yields of C300-91, C224-91, and C306-91 were 11%, 8%, and 5% greater than Deltapine 50, while yield of C221-91 averaged 18% greater than Deltapine 50 in tests conducted from 1993-1994. Fiber strength and length are generally equal to or greater than Deltapine 50, while micronaire value of Deltapine 50 averages 10% higher. This germplasm should be an excellent genetic material for developing cotton cultivars adapted to south Texas and Mexico.

Technical Abstract: Four cotton germplasm lines, C221-91, C224-91, C300-91, and C306-91, were developed and released by the USDA-ARS, Texas Agricultural Experiment Station, and Rio Farms, Inc. In reniform nematode-infested plots, C224-91, C300-91, and C306-91 had significantly greater yields than Stoneville 453 and La. RN 1032, and yield reductions caused by reniform nematodes for the three germplasm lines were less than 50% of that observed for Stoneville 453. From 1992-1994, compared to Deltapine 50 in tests located in the southern region of Tamaulipas, Mexico, first harvest and total lint yields were 26% and 15% greater for C221-91, 36% and 19% greater for C300-91, and 9% and 2% greater for C306-91. In yield tests conducted in the Lower Rio Grande Valley and Coastal Bend areas of Texas from 1992-1994, lint yields of C300-91, C224-91, and C306-91 were 11%, 8%, and 5% greater than Deltapine 50, while yield of C221-91 averaged 18% greater than Deltapine 50 in tests conducted from 1993-1994. C221-91, C224-91, and C300-91 are earlier in maturity than Deltapine 50. Fiber strength and length are generally equal to or greater than Deltapine 50, while micronaire value of Deltapine 50 averages 10% higher.