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Correlated Responses To Recurrent Selection For Grain Yield In Maize
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Book Synopsis Direct and Correlated Responses to Recurrent Selection for Grain Yield in Maize Breeding Populations by : Morakinyo Abiodun Bamidele Fakorede
Download or read book Direct and Correlated Responses to Recurrent Selection for Grain Yield in Maize Breeding Populations written by Morakinyo Abiodun Bamidele Fakorede and published by . This book was released on 1977 with total page 678 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.(...).
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 Correlated Responses for Grain Yield and Other Agronomic Traits with Recurrent Selection for Improved Stalk Quality Or for Resistance to the European Corn Borer in Two Maize Populations by : Paulo Nelson Rehn
Download or read book Correlated Responses for Grain Yield and Other Agronomic Traits with Recurrent Selection for Improved Stalk Quality Or for Resistance to the European Corn Borer in Two Maize Populations written by Paulo Nelson Rehn and published by . This book was released on 1985 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Recurrent Selection for Combining Ability Between Two Partitioned Populations in Maize by : Gregory John Holland
Download or read book Evaluation of Recurrent Selection for Combining Ability Between Two Partitioned Populations in Maize written by Gregory John Holland and published by . This book was released on 1991 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Response to Eight Cycles of Full-sib Reciprocal Recurrent Selection for Grain Yield and Standability in BS10 and BS11 Maize Populations by : Guillermo Hugo Eyherabide
Download or read book Response to Eight Cycles of Full-sib Reciprocal Recurrent Selection for Grain Yield and Standability in BS10 and BS11 Maize Populations written by Guillermo Hugo Eyherabide and published by . This book was released on 1989 with total page 290 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 Response to Thirteen Cycles of Reciprocal Full Sib Recurrent Selection in the BS10 and BS11 Maize (Zea Mays L.) Populations by : Benjamin Aaron Ford
Download or read book Response to Thirteen Cycles of Reciprocal Full Sib Recurrent Selection in the BS10 and BS11 Maize (Zea Mays L.) Populations written by Benjamin Aaron Ford and published by . This book was released on 2001 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increases in grain yield, the primary trait for selection, include a direct response of 2.2 percent per cycle in the population cross, and indirect responses of 3.3 and 1.2 percent per cycle in BS10 and BS11, respectively, but only the response for BS11 fits a linear model. Linear trends through the first nine selection cycles, however, indicate a 4.6 percent per cycle increase for the population cross, as well as increases of 1.6 percent in BS10 and 1.6 percent in BS11 parent populations. Evaluations of random S1 line performance for BS10CO, BS10C13, BS11CO, and BS11C13 indicate decreasing trends in genetic variability over 13 cycles of FR. Exceptions are grain yield in BS10 and BS11 and plant height in BS11. While genetic variance estimates for grain yield are nearly equal for BS11CO and BS11C13, a nearly significant increase in variability is evident from BS10CO to BS10C13. Variability estimates suggest FR for grain yield in BS10 and BS11 will be effective in future selection cycles.
Book Synopsis Evaluation of Visual S1 Recurrent Selection for Early Vigor in Maize by : Daryl Keith Hexum
Download or read book Evaluation of Visual S1 Recurrent Selection for Early Vigor in Maize written by Daryl Keith Hexum and published by . This book was released on 1984 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Reciprocal Recurrent Selection for Grain Yield in Maize (Z. Mays L) by : Seme Debela
Download or read book Evaluation of Reciprocal Recurrent Selection for Grain Yield in Maize (Z. Mays L) written by Seme Debela and published by . This book was released on 1972 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Response to S1 Recurrent Selection and Estimation of Genetic Parameters in Effective Population Sizes of the BS11 Maize Population by : Kebede Mulatu Ponta
Download or read book Response to S1 Recurrent Selection and Estimation of Genetic Parameters in Effective Population Sizes of the BS11 Maize Population written by Kebede Mulatu Ponta and published by . This book was released on 2001 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: The S1 selection increased yield in 10-S1, 20-S1, and 30-S1 due to favorable additive effects. In BS11C0 population both additive and dominance genetic effects were responsible for grain yield; however, the additive effect was greater than the dominance effect. Larger effective sizes (20-S1, 30-S1) had loci with more favorable additive effects and showed better response to selection than the smaller effective sizes (5-S1, 10-S1). The inbreeding depression effects were significant in all the populations as the result of genetic drift. Grain moisture, root lodging, stalk lodging, and all other correlated agronomic traits were improved in the desired direction. Direct and indirect responses were more favorable in the larger effective population sizes than in the smaller. The results suggest that effective size of 30 is preferable for recurrent selection programs planned for at least ten or more years.
Book Synopsis Genetic Analysis of Grain Yield and Associated Characters in Two Maize Populations (Ashwini and Harsha) Through Reciprocal Recurrent Selection by : Umakanth U. Akula
Download or read book Genetic Analysis of Grain Yield and Associated Characters in Two Maize Populations (Ashwini and Harsha) Through Reciprocal Recurrent Selection written by Umakanth U. Akula and published by . This book was released on 1997 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Changes in Physiological Traits Associated with Five Cycles of S1 Recurrent Selection in Two Maize Populations by : Bernard James Hable
Download or read book Changes in Physiological Traits Associated with Five Cycles of S1 Recurrent Selection in Two Maize Populations written by Bernard James Hable and published by . This book was released on 1985 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: Five cycles of S1 recurrent selection for cold tolerance were conducted at Iowa State University in maize population BS13(SCT) and BSSS2(SCT). Previous studies have indicated that improvement in cold tolerance had been realized in these programs and that a correlated improvement in grain yield had taken place. The objective of this study were: 1) to examine the change in ontogenetic development correlated with changes in cold tolerance, 2) to evaluate changes in physiological traits and yield components associated with the previously observed correlated improvements in grain yield, and 3) to relate changes in means to changes in allelic frequencies and genetic drift. The CO, C5, and C0 c C5 intrapopulation cross of both BS13(SCT) and BSSS2(SCT), and the CO xCO and C5 x C5 interpopulation crosses were evaluated in five environments over three years. All experiments were planted in five environments over three years. All experiments were planted after 20 April in central Iowa. To assess the correlated changes, the C0 and C% cycle means were compared and a model proposed by Smith (1979a) was utilized to estimate correlated changes in gene frequency and changes in gne frequency due to restricted population size. The recurrent selection programs for cold tolerance resulted in earlier flowering in both of the population evaluated in this study. The C5 cycels of both BS13(SCT) and BSSS2(SCT) silked in at least 40 fewer growing degree days (GDD) than the CO cycles, and estimated, correlacted for genetic drift, (...).
Book Synopsis Influence of Water Stress in Selection and Evaluation Environments on Response to Recurrent Selection in Maize by : Scott Selmer Johnson
Download or read book Influence of Water Stress in Selection and Evaluation Environments on Response to Recurrent Selection in Maize written by Scott Selmer Johnson and published by . This book was released on 1987 with total page 146 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 Research Bulletin by : M. A. B. Fakorede
Download or read book Research Bulletin written by M. A. B. Fakorede and published by . This book was released on 1966 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis One Vs Two Genetic Pools for Full-sib Reciprocal Recurrent Selection in Maize (Zea Mays L.) by : José Luis De León
Download or read book One Vs Two Genetic Pools for Full-sib Reciprocal Recurrent Selection in Maize (Zea Mays L.) written by José Luis De León and published by . This book was released on 1979 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
