|12-209 Project Manager: D. C. Jones|
DETERMINING THE BREEDING POTENTIAL OF NEAR-ELS GERMPLASM
Todd Campbell, USDA-ARS
Eleven near-ELS germplasm lines were previously crossed to each of 4-6 elite upland cultivars or germplasm lines to generate topcross populations. In 2012, F2 bulk topcross progeny along with parental lines were evaluated in a replicated field trial near Florence, SC. The near-ELS germplasm lines included ACALA, MESSILLA VALLEY 898, EWING LONG STAPLE X TIDEWATER, GREER WICHITA-169-1203 POPE 36, MEADE 14-2, SEALAND 1, SEALAND 3, SEALAND 472, SEALAND 883, D AND PL 45-867, SPEARS UPLAND EARLY LONG STAPLE, and SPEARS 3. The elite upland cultivars or germplasm lines included DP 90, DES 119, MD 25, Delta Pearl, PD 94042, and UA-48. Not all topcrosses generated enough seed for replicated field testing, so only progeny and parental lines with adequate seed amounts were included in the trial. PHY-72 was included as a check. In total, 70 entries were planted in a four-replicate, alpha-lattice incomplete block design. Each replicate contained 10 incomplete blocks of size seven.
The trial was planted on May 22 and harvested on December 4. Prior to machine harvesting, a 25-boll sample was hand harvested from each plot. This sample was ginned on a 10-saw laboratory gin to determine lint percent. Boll weight was determined from the weight of the 25-boll seed cotton sample. Following ginning, a lint fiber sample was collected and sent on December 21, 2012 to the Fiber Testing Laboratory at Cotton Incorporated to determine HVI fiber properties. To date, we have collected data for lint yield, lint percent, and boll weight. These data have been analyzed using ANOVA and least square means calculated for each of the 70 entries.
Among near-ELS parents, SPEARS UPLAND EARLY LONG STAPLE, EWING LONG STAPLE X TIDEWATER, and D AND PL 45-867 produced the highest lint yields. All near-ELS parents yielded lower than the highest yielding elite parent (UA-48). SPEARS UPLAND EARLY LONG STAPLE, EWING LONG STAPLE X TIDEWATER, D AND PL 45-867, and SEALAND 3 yielded equal to the lowest yielding elite parent (Delta Pearl). Among near-ELS topcross progenies, those derived from EWING LONG STAPLE X TIDEWATER and GREER WICHITA-169-1203 POPE 36 produced the highest lint yields. Topcross progeny derived from Spears 3 produced the lowest lint yield.
Among near-ELS parents, GREER WICHITA-169-1203 POPE 36 produced the highest lint percent. All near-ELS parents produced lint percent lower than each of the elite parents with one exception. GREER WICHITA-169-1203 POPE 36 produced a lint percent similar to the lowest lint percent elite parent (UA-48). Among near-ELS topcross progenies, those derived from GREER WICHITA-169-1203 POPE 36 produced the highest lint percent. Topcross progeny derived from SEALAND 472 produced the lowest lint percent.
Among near-ELS parents, EWING LONG STAPLE X TIDEWATER, SPEARS 3, and SEALAND 472 produced the highest boll weight. EWING LONG STAPLE X TIDEWATER and SPEARS 3 produced boll weights equal to the highest elite parent (UA-48). MEADE 14-2 produced the lowest boll weight of any near-ELS or elite parent. Among near-ELS topcross progenies, those derived from ACALA, MESSILLA VALLEY 898 and SEALAND 1 produced the highest boll weights.
Overall, these data suggest that a number of near-ELS derived topcross progeny produce competitive lint yields. Not surprising, on average, near-ELS topcross progeny produce fairly low lint percent. After receiving HVI fiber quality data, similar comparisons will be made to determine the fiber quality performance of near-ELS derived topcross progeny. After collecting additional data during 2013, variance components and combining ability estimates will be calculated to determine the breeding potential of near-ELS derived populations.
|Project Year: 2012|
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