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Combined Half Sib And S1 Recurrent Selection For Drought Tolerance In A Maize Zea Mays L Population
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Book Synopsis Combined Half-sib and S1 Recurrent Selection for Drought Tolerance in a Maize (Zea Mays L.) Population by : Gilberto Sosa-Dominguez
Download or read book Combined Half-sib and S1 Recurrent Selection for Drought Tolerance in a Maize (Zea Mays L.) Population written by Gilberto Sosa-Dominguez and published by . This book was released on 1992 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recurrent Selection for Drought Tolerance in Maize (Zea Mays L. and Study of Heterotic Patterns of Maize Populations from Eastern Kenya by : Philip Kipkoech Leley
Download or read book Recurrent Selection for Drought Tolerance in Maize (Zea Mays L. and Study of Heterotic Patterns of Maize Populations from Eastern Kenya written by Philip Kipkoech Leley and published by . This book was released on 2007 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Agronomic and RFLP Evaluation of Four Cycles of Combined Half-sib and S1 Recurrent Selection in a Three Line Maize Zea Mays L. Composite by : Carl F. Behr
Download or read book Agronomic and RFLP Evaluation of Four Cycles of Combined Half-sib and S1 Recurrent Selection in a Three Line Maize Zea Mays L. Composite written by Carl F. Behr and published by . This book was released on 1994 with total page 266 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 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 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 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:
Book Synopsis Recurrent Selection for Disease and Insect Resistance in the BS8(S)C1 Maize (Zea Mays L.) Population by : Binsika Bimayala
Download or read book Recurrent Selection for Disease and Insect Resistance in the BS8(S)C1 Maize (Zea Mays L.) Population written by Binsika Bimayala and published by . This book was released on 1977 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two hundred S1 lines of BS8 S1 from the BS8 population were grown in several locations during the growing season of 1975 for yield. European corn borer, H. turcicum, H. maydis P. sorghi, P. polysora, and downy mildew evaluation. The 200 lines were divided into three sets of experiments of 100, 50, and 50 entries conducted in simple lattice and randomized complete block designs, respectively. A pooled analysis for all experiments also were calculated for each trait. Data for yield were taken in a disease-free environment at the Ames Hinds Farm. Observations for the pathogens were made on plants infected artificially for some traits and on plants under natural infection for other traits. The analysis of variance for yield and pathogen were computed. The results obtained showed significant differences among progenies insome experiments and no significant differences for others for different characters. The coefficient of variation (C.V.'S) for root and stalk lodging anddropped ears were high and resulted from low means and the relatively large experimental errors. Data for root stalk lodging and dropped ears, however, were not considered for selecting the best lines for recombination to initiable the next cycle of selection. Estimates of variance components were obtained from the analysis of variance of each experimental and the pooled analysis. The correlation coefficients between yield and different pathogens were calculated by use of the estimates of components of variance, The mean squares, and the (...).
Book Synopsis Recurrent Selection Methods for Maize Improvement by : Larry Lynn Darrah
Download or read book Recurrent Selection Methods for Maize Improvement written by Larry Lynn Darrah and published by . This book was released on 1977 with total page 32 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:
Download or read book Acta Agronomica Hungarica written by and published by . This book was released on 1986 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Drought Stress in Maize (Zea mays L.) by : Muhammad Aslam
Download or read book Drought Stress in Maize (Zea mays L.) written by Muhammad Aslam and published by Springer. This book was released on 2015-11-20 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on early germination, one of maize germplasm most important strategies for adapting to drought-induced stress. Some genotypes have the ability to adapt by either reducing water losses or by increasing water uptake. Drought tolerance is also an adaptive strategy that enables crop plants to maintain their normal physiological processes and deliver higher economical yield despite drought stress. Several processes are involved in conferring drought tolerance in maize: the accumulation of osmolytes or antioxidants, plant growth regulators, stress proteins and water channel proteins, transcription factors and signal transduction pathways. Drought is one of the most detrimental forms of abiotic stress around the world and seriously limits the productivity of agricultural crops. Maize, one of the leading cereal crops in the world, is sensitive to drought stress. Maize harvests are affected by drought stress at different growth stages in different regions. Numerous events in the life of maize crops can be affected by drought stress: germination potential, seedling growth, seedling stand establishment, overall growth and development, pollen and silk development, anthesis silking interval, pollination, and embryo, endosperm and kernel development. Though every maize genotype has the ability to avoid or withstand drought stress, there is a concrete need to improve the level of adaptability to drought stress to address the global issue of food security. The most common biological strategies for improving drought stress resistance include screening available maize germplasm for drought tolerance, conventional breeding strategies, and marker-assisted and genomic-assisted breeding and development of transgenic maize. As a comprehensive understanding of the effects of drought stress, adaptive strategies and potential breeding tools is the prerequisite for any sound breeding plan, this brief addresses these aspects.
Book Synopsis Breeding for drought and nitrogen stress tolerance in maize: From theory to practice by : M. Bänzinger
Download or read book Breeding for drought and nitrogen stress tolerance in maize: From theory to practice written by M. Bänzinger and published by CIMMYT. This book was released on 2000 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction - why breed for drought and low N tolerance?; Conceptual framework - breeding; Conventional approaches to improving the drought and low N tolerance of maize; Conventional approaches challenged; The challenge of breeding for drought and low N tolerance; Maize under drought and low N stress; Conceptual framework - physiology; Water and the maize plant; Nitrogen and the maize plant; Maize under drought and low N stress - consequences for breeding; Stress management; Drought; Low N stress; Statistical designs and layout of experiments; Increasing the number of replicates; Improved statistical designs; Field layout; Border effects from alleys; Secondary traits; Why use secondary traits?; How do we decide on the value of secondary traits in a drought or low N breeding program?; Secondary traits that help to identify drought tolerance; Secondary traits that help to identify low N tolerance: Selection indices - Combining information on secondary traits with grain yield; Combining information from various experiments; Breeding strategies; Choice of germplasm; Breeding schemes; Biotechnology: potential and constraints for improving drought and low N tolerance; The role of the farmer in selection; What is farmer participatory research and why is it important?; What is new about farmer participatory research?; Participatory methodologies.
Book Synopsis Evaluation of Recurrent Selection in the BS12 and BS15 Maize (Zea Mays L.) Populations by : Manuel Cortez-Flores
Download or read book Evaluation of Recurrent Selection in the BS12 and BS15 Maize (Zea Mays L.) Populations written by Manuel Cortez-Flores and published by . This book was released on 1983 with total page 104 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 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 Evaluation of Progress in Recurrent Selection for Specific Combining Ability in Two Open-pollinated Maize (Zea Mays L.) Varieties by : Ronald N. Walejko
Download or read book Evaluation of Progress in Recurrent Selection for Specific Combining Ability in Two Open-pollinated Maize (Zea Mays L.) Varieties written by Ronald N. Walejko and published by . This book was released on 1976 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: To decide upon the most efficient breeding and testing procedures to improve maize populations, the plant breeder must have adequate knowledge of the type of gene action involved in yield heterosis. Two types of gene action have been postulated to account for yield heterosis in maize: dominance and overdominance. Recurrent selection of specific combining ability and for general combining ability have been proposed as methods to improve maize populations. Recurrent selection for specific combining ability uses a narow genetic base tester and originally was proposed on the assumption that overdominance is the main type of gene action responsible for yield heterosis. Conversely, selection for general combining ability uses a broad genetic base tester and assumes that dominant, favorable factors are concerned in yield heterosis. A procedure was proposed to compare the relative importance of dominance and overdominance in yield heterosis. This procedure involved recurrent relection for specific combining ability in two heterozygous source populations with a common inbred line tester. The purpose of this study was to evaluate progress in 5 cycles of recurrent slection for specific combining ability in two open-pollinated maize varieties and to determine the type of gene action involved in yield heterosis. The two source populations were the open-pollinated varieties, Kolkmeier and Lancaster, and the inbred line, Hy, was used as the common tester. After 5 cycles of recurrent selection, 6 population (C0 to C5) from (...).
