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Observed And Expected Response Of Yield And Stalk Strength To Full Sib Family Selection In A Population Of Maize
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Book Synopsis Observed and Expected Response of Yield and Stalk Strength to Full-sib Family Selection in a Population of Maize by : Sydney Walter Nelson
Download or read book Observed and Expected Response of Yield and Stalk Strength to Full-sib Family Selection in a Population of Maize written by Sydney Walter Nelson and published by . This book was released on 1968 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Quantitative Trait Response Evaluation to Selection in the BS13(S) Maize (Zea Mays L.) Population by : Clinton J. Turnbull
Download or read book A Quantitative Trait Response Evaluation to Selection in the BS13(S) Maize (Zea Mays L.) Population written by Clinton J. Turnbull and published by . This book was released on 2006 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seven cycles of half-sib recurrent selection were conducted in the BSSS maize population followed by ten cycles of S2 progeny recurrent selection. The population under S2 progeny recurrent selection is formally known as BS13(S). The selection criteria have always placed importance on high grain yield, low grain moisture, and reduced plant lodging. Two evaluations estimating the response of multiple agronomic traits in multiple response units including the population sampled at F[subscript IS] = 0, F[subscript IS] = 0.5, and F[subscript IS] = 0.75 levels of inbreeding, and multiple testcrosses of the population were conducted. The average response of grain yield in the F[subscript IS] = 0.5 and F[subscript IS] = 0.75 response units (i.e. inbred response units) of the population are significantly greater than the average responses in both the panmictic population and multiple testcrosses of panmictic population. There is no statistical grain yield response to selection in the F[subscript IS] = 0 response unit (panmictic population). A testcross of the panmictic population to BS13(S)C0 has an average response greater than the panmictic population indicating that the limited response in the F[subscript IS] = 0 response unit is not likely due to random genetic drift, however, the allelic frequencies are diverging from the progenitor population. Favorable responses have been observed for root lodging in all of the response units however, a limited response for stalk lodging exist. The response of grain moisture is inconsistent between the two evaluations likely as a result of inconsistent selection practices and the difficulty to select for this trait. We hypothesize that the most important reason for the realized lack of response in the panmictic population is due to a low inbred-outbred correlation and may be caused by an overdominant-like gene action within this population. To avoid the necessity for assumptions about gene action controlling the traits in maize and importance of additive and non-additive effects, the genetic gain equation must be developed in relation to the selection unit and target response unit (i.e. S1s, S2S, half-sibs, or full-sibs). This dissertation supports both the genetic gain equations reported by Wardyn (2006) and the hypothesis of overdominant-like gene action in this population reported by Edwards and Lamkey (2002).
Book Synopsis Press Statement by : Southern Rhodesia
Download or read book Press Statement written by Southern Rhodesia and published by . This book was released on 1968 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct and Correlated Response to Recurrent Selection for Grain Yield in Maize Breeding Populations by : M.A.B. Fakorede
Download or read book Direct and Correlated Response to Recurrent Selection for Grain Yield in Maize Breeding Populations written by M.A.B. Fakorede and published by . This book was released on 1977 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dr. G. F. Sprague initiated recurrent selection programs during the 1940' and 1950' to improve the grain-yield performance of several maize (Zea mays L.) population at the Iowa Agriculture and Home Economics Experiments Station. Seven cycles of reciprocal recurrent selections (RRS) in Iowa Stiff Stalk Synthetic (BSSS) and Iowa Corn Borer Synthetic #1 (BSCB1), and six cycles of recurrent half-sib selection (HS) in the open-pollinated variety 'Alph'(i.e., BS12) have been completed. Inbred B14 was the tester in the HS program. My objectives were to (1) evaluate progress that resulted from the RRS and HS programs and (2) evaluate changes in several other traits associated with recurrent selection for grain yield. I evaluated the CO x CO, C5, and C7 x C7 of the RRS program, and CO and C6 of the HS program, each testcrossed to B14A. Estimated gain from seven cycles of RRS was 2.06 q/ha (or 5.21%) per cycle and observed difference in mean yield between CO and C6 of the program was 2.25 q/ha (or 6.00%) per cycle. Improved hybrids outyield their unimproved counterparts at all levels of nitrogen (0, 90, 180, and 270 kg N/ha) and plant density (39,000; 59,300; 79,000; and 98,800 plants/ha) investigated. Each hybrid displayed a positive, curvilinear response to nitrogen and a negative, linear response to plant density. Stability and adaptation-reaction analysis revealed that improved hybrids consistently demonstrated greater adaptation to high-nitrogen environments, but their unimproved counterparts did not take (...).
Book Synopsis Research Grants Index by : National Institutes of Health (U.S.). Division of Research Grants
Download or read book Research Grants Index written by National Institutes of Health (U.S.). Division of Research Grants and published by . This book was released on 1969 with total page 862 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Awards Index written by and published by . This book was released on with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Report of Annual Corn and Sorghum Research Conference by :
Download or read book Report of Annual Corn and Sorghum Research Conference written by and published by . This book was released on 1968 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Response to Full-sib Reciprocal Recurrent Selection in a Double-cross Maize Population by : Eduardo J. Graterol M.
Download or read book Response to Full-sib Reciprocal Recurrent Selection in a Double-cross Maize Population written by Eduardo J. Graterol M. and published by . This book was released on 2005 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Correlated Responses to Recurrent Selection for Grain Yield in Maize by : M. A. B. Fakorede
Download or read book Correlated Responses to Recurrent Selection for Grain Yield in Maize written by M. A. B. Fakorede and published by . This book was released on 1982 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments were conducted in there field environments with the following objectives: (1) to evaluate the progress from seven cycles of reciprocal recurrent selection in Iowa Stiff Stalk Synthetic (BSSS(R) and Iowa Corn Borer Synthetic #1 (BSCB(R) and six cycles of half-sib family selection in 'Alph' (i.e. BS12) maize (Zea mays L.) populations, (2) to compare the response of unimproved and improved maize variety hybrids to different levels of nitrogen fertilizer and plant density, and (3) to evaluate the influence of nitrogen and plant density on the morphological and physiological traits associated with recurrent selection for grain yield in maize. Each experiment was grown in randomized complete blocks with a split-split-plot arrangement and two replications. Nitrogen fertilizer levels (0,90,180, and 270 kg N/ha) were main plots, plant densities (39,500; 59,300; 79,000; and 98,800 plants/ha) were subplots, and five variety hybrids, BSSS(R)CO x BSCB1(R)CO, BSSS(R)C5 x BSCB1(R)C5, BSSS(R)C7 x BSCB1(C7, BS12C0 x B14A, and BS12C6 x B14A, were randomized as sub-subplots. We obtained data on grain yield and grain-yield components, flowering traits, plant traits, leaf area, leaf orientation, lodging, dry-matter productivity, and harvest index.(...).
Download or read book Dissertation Abstracts written by and published by . This book was released on 1968 with total page 998 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Progress from Full-sib Family Selection for Potential Yield Improvement in Two Tropical Maize Populations by : Samuel Cephas Muchena
Download or read book Evaluation of Progress from Full-sib Family Selection for Potential Yield Improvement in Two Tropical Maize Populations written by Samuel Cephas Muchena and published by . This book was released on 1977 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Observed Response and Genetic Variability in Two Maize Populations After Four Cycles of Reciprocal Full-sib Selection by : Manuel Montecer Lantin
Download or read book Observed Response and Genetic Variability in Two Maize Populations After Four Cycles of Reciprocal Full-sib Selection written by Manuel Montecer Lantin and published by . This book was released on 1980 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Full-sib Family Selection for Population Improvement in Maize (Zea Mays L.) by : Abdrabboh Ahmed Ismail
Download or read book Full-sib Family Selection for Population Improvement in Maize (Zea Mays L.) written by Abdrabboh Ahmed Ismail and published by . This book was released on 1975 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical communication written by and published by . This book was released on with total page 1062 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Tolerance to High Plant Densities and Plant Efficiency of Maize Breeding Population Developed by Recurrent Selection of Grain Yield by : T.M. Crosbie
Download or read book Evaluation of Tolerance to High Plant Densities and Plant Efficiency of Maize Breeding Population Developed by Recurrent Selection of Grain Yield written by T.M. Crosbie and published by . This book was released on 1978 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several recurrent relection schemes are being used to improve grain-yield performance of several maize (Zea mays L.) populations at the Iowa Agriculture and Home Economics Experiment Station. Three cycles of reciprocal full-sib selection in Iowa Two-ear Synthetic [BS10(FR)] and Pioneer Twc-ear Composite [BS11(FR)], seven cycels of reciprocal recurrent selection in Iowa Stiff Stalk Synthetic [BSSS(R)], Iowa Corn Borer Synthetic #1 [BSCB1(R)], and five cycels of half-sib recurrent selection in Lancaster Surecrop 9LANC) with maize inbred, Hy, as tester have been completed. I grew testcrosses of unimproved and improved populations of BS10(FR), BS11(FR), BSSS(R), BSCB1(R) And LANC, plus population crosses (i.e., CO X CO, CN X CN) of BS10(FR) X BS11(FR) and BSSS(R) X BSCB1(R) at three plant densities in three environments. Testers were maize inbreds Mo17, B77, and B79, My research was conducted: (1) to evaluate respones to plant densities of the CO and CN populations, (2) to study changes in several morphological and physiological traits associated with recurrent selection for increased grain yield, and (3) to caompare results obtained for testcrosses and populations crosses to evaluate combining ability for grain yield, density tolerance, and physiological traits. Reciprocal full-sib selection did not improve the response to plant densities of testcrosses and population crosses of BS10(FR) and BS11(FR). Furthermore, selection did not increase grain yield of BS10(FR) X BS11(FR) at 39.5 and 79.0 M plants/ha or of (...).
Book Synopsis Selection for Response to Nitrogen Fertilizer in a Tropical Maize Population by : Peter Yao Kanze Sallah
Download or read book Selection for Response to Nitrogen Fertilizer in a Tropical Maize Population written by Peter Yao Kanze Sallah and published by . This book was released on 1989 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Faculty Publications and Research by : North Carolina State College
Download or read book Faculty Publications and Research written by North Carolina State College and published by . This book was released on 1964 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:
