RELEASE OF TAMCOT 22, TAM 96D-18, TAM 96D-69S, TAM 98D-102 AND TAM 98D-99NE

摘要

‘Tamcot 22’, TAM 96WD-69s, TAM 96WD-18 , TAM 98D-102 and TAM 98D-99ne upland cottons (Gossypium hirsutum L.) were developed by the Cotton Improvement Laboratory, Department of Soil and Crop Sciences, Texas Agricultural Experiment Station as part ofan ongoing effort to create germplasm and/or cultivars with improved yield and quality potential for central and south Texas. Tamcot 22, TAM 96WD-69s, TAM 96WD-18, TAM 98D-102 and TAM 98D-99ne have picker-type bolls, mid-season maturity, and good yield potential combined with varying fiber quality packages. With the exception of TAM96WD-69s which has glabrous leaves and stems, all have pubescent leaves and stems. Tamcot 22 has varying levels of leaf pubescence, ranging from 7 to 72 trichomes cm-2 on theleaves. TAM 96WD-69s is a near glabrous leaf and stem line that has resistance to fleahopper [Pseudatomoscelis seriatus (Reuter)] (Mekala, 2004), and silverleaf whitefly [Bemesis argentifolli (Gennadius)] by virtue of its smooth leaves. Fully expanded leaves of TAM 96WD-69s averaged 9 trichomes cm-2 while leaves of ‘Deltapine 50’ (Calhoun et al., 1994), Tamcot 22, and ‘Tamcot CAB-CS’ (Bird et al., 1986) averaged 12, 33, and 4 trichomes cm-2, respectively. The stems of TAM 96WD-69s averaged 1 trichome cm-2 compared with 6 trichome cm-2 on Deltapine 50, 8 trichomes cm-2 on Tamcot 22, and 0.4 trichome cm-2 on Tamcot CAB-CS. The number of trichomes on bract margins of TAM 96WD-69s was 76 cm-2 while Deltapine 50, Tamcot 22 and Tamcot CAB-CS averaged 86, 242, 72, respectively. TAM 98D-99ne does not exhibit leaf nor bract nectaries. Tamcot 22, TAM 96WD-69s, TAM 96WD-18, TAM 98D-102 and TAM 98D-99ne are adapted to production regions of Texas from the Rio Grande Valley to the Rolling Plains and westward to the Winter Garden area. They perform well on the High Plains but do not possess sufficient storm resistance for production in that region.