Inbreeding depression in maize

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WebSep 23, 2016 · Inbreeding depression in single, three way and double-cross hybrids of maize Currently, one of the acclaimed alternatives for increasing maize yield is accomplished through utilization of heterosis in hybrid cultivars. However, upon performing crosses between related pairs, there are losses due to inbreeding depression. WebSep 2, 2024 · Inbreeding depression was greater in maize than teosinte for 15 of 18 traits, congruent with the greater segregating genetic load predicted from sequence data in the maize population. For many traits - and more commonly in maize - genetic variation among selffertilized families was less than expected based on additive and dominance variance ...

A Genetic Interpretation of the Variation in Inbreeding Depression

http://xmpp.3m.com/inbreeding+research+paper WebNov 28, 2016 · Even though inbreeding depression is severe in perennial ryegrass DHs, reports of vigorous and fertile plants do exist . In the early days of maize [ 124 ] and rye hybrid breeding [ 125 ], both allogamous cereals suffered from inbreeding depression as well, and selection among inbred lines was successfully used to improve their vigour and ... eagles founded

(PDF) Gibberellins and Heterosis in Maize - Academia.edu

WebAug 27, 2024 · Inbreeding depression is widespread across plant and animal kingdoms and may arise from the exposure of deleterious alleles and/or loss of overdominant alleles … WebNov 30, 2024 · The opposite effect, inbreeding depression, results from repeated self-pollination and leads to a reduction in vigor. A popular explanation for this reaction is the … WebInbreeding depression for seed set was small, suggesting seed set may not be the limiting factor in maintaining autotetraploid maize inbred lines that it is in other autotetraploid species. Inbreeding depression for yield corresponded to that expected based on the coefficient of inbreeding assuming the completely inbred generation has a mean of ... csm demon ange

Heterosis and Hybrid Crop Breeding: A Multidisciplinary Review

WebDec 1, 2024 · Therefore, IMPH is a function of inbreeding depression, genetic divergence, and dominance whereas panmictic-midparent heterosis is a function only of genetic divergence and dominance (Lamkey and Edwards 1999). In maize, heterosis is exploited by creating single-cross hybrids from two genetically distinct heterotic pools. WebJan 14, 2024 · Inbreeding depression in clonally propagated plants is expected to be more severe than that in seed plants, as more deleterious mutations accumulate during asexual reproduction, whereas purging... eagles football team imagesWebRate of inbreeding depression for yield by selfing was b 1 = --46.53 q/ha and by full-sibbing, b L = --45.11 q/ha. At comparable levels of homozygosity, means of the lines developed by selfing and full-sibbing were not significantly different except for yield at 99% homozygosity. csm dermatology centre

"WebThe objective of this study was to evaluate the combining ability and inbreeding depression of commercial maize hybrids for agricultural traits. Twenty-two commercial maize hybrids, 96 F1 crosses ... " - Inbreeding depression in maize

Inbreeding depression in maize

Genomic prediction of hybrid performance for agronomic traits in ...

WebInbreeding depression is widespread across plant and animal kingdoms and may arise from the exposure of deleterious alleles and/or loss of overdominant alleles resulting from increased homozygosity, but these genetic models cannot fully explain the … WebInbreeding depression Example for maize height F 2 F 3 F 4 F 5 F 6. 9 Fitness traits and inbreeding depression •Often seen that inbreeding depression is strongest on fitness-relative traits such as yield, height, etc. •Traits less associated with fitness often show less inbreeding depression

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WebOct 3, 2024 · The present study aimed to obtain estimates of inbreeding depression for eight traits in seven tropical maize populations, analyze the effects of inbreeding over … WebJan 17, 2024 · Inbreeding depression and heterosis in maize was initially documented by George H. Shull and Edward M. East [4–6]. The adoption of hybrid maize over open-pollinated varieties occurred remarkably fast due to improved yields, greater uniformity for machine harvesting, and increased durability under extreme abiotic stress. ...

WebApr 7, 2024 · Inbreeding Depression Dr. Kaushik Kumar Panigrahi Follow Assistant Professor-Cum-Junior Scientist at Orissa University of Agriculture and Technology Advertisement Advertisement Recommended Inbreeding & Inbreeding depression in Plants Tulshiram Rathod 22.3k views • 16 slides Presentation on Heterosis Dr. Kaushik Kumar … WebMating between closely related individuals can result in inbreeding depression, a loss of fitness ( Charlesworth and Charlesworth 1987) that can affect endangered or isolated species ( Kardos et al. 2016) and lead to the eventual extinction of small populations ( Hedrick and Garcia-Dorado 2016 ).

WebAbstract. Self-fertilization (also known as selfing) is an important reproductive strategy in plants and a widely applied tool for plant genetics and plant breeding. Selfing can lead to inbreeding depression by uncovering recessive deleterious variants, unless these variants are purged by selection. Here we investigated the dynamics of purging ... WebThis book describes the historical importance of potato (Solanum tuberosum L.),potato genetic resources and stocks (including S. tuberosum group Phureja DM1-3 516 R44, a unique doubled monoploid homozygous line) used for potato genome sequencing

WebThe objectives of this study were to estimate genetic rates of gain and inbreeding depression by evaluating populations representative of each of seven eras of maize …

WebJul 11, 2012 · Abstract. Inbreeding depression (i.e. negative fitness effects of inbreeding) is central in evolutionary biology, affecting numerous aspects of population dynamics and demography, such as the evolution of mating systems, dispersal behaviour and the genetics of quantitative traits. Inbreeding depression is commonly observed in animals and plants. csm devils hearr wikiWebSep 1, 2024 · The coefficient of inbreeding depression measured as the absolute proportional change in population mean from a single generation of selfing was higher on average for environmental response traits within both subspecies, 21% (in teosinte) and 36% (in maize; (Figure 1; Figure S2; Table S3). csm desktop client downloadWebIn order to verify the genetic and agronomic value, yield potential and inbreeding depression of synthesized composites, as well as quantifying the population variability and incorporating new sources of semiexotic germplasm in maize genetic improvement programs, four populations, identified as NAP-FA x HG-71 (P1), NAP-FL x HG-49 (P2), NAP … eagles forumWebNAR of Two Maize Inbreds and Their F1 Hybrid NAR at Following Days from Emergence 6-15 15-21 21-28 28-38 z mg/cm2*d-1 Ag Inbred UA. ... . significantly greater than that of CM49 on day 6, although on all Except for the slight depression in the hybrid growth curve (Fig. subsequent harvests hybrid shoots were significantly heavier (Fig. 3) which ... csm definedhttp://xmpp.3m.com/inbreeding+research+paper csmd.edu bookstoreWebSep 2, 2024 · These results suggest a mixture of mostly polygenic, smalleffect recessive variation underlying inbreeding depression, with an additional contribution from rare … eagles founderWebIn a small population, matings between relatives are common. This inbreeding may lower the population's ability to survive and reproduce, a phenomenon called inbreeding depression. For example, a population of 40 adders (Vipera berus, shown at right) experienced inbreeding depression when farming activities in Sweden isolated them from … csm devils heart