Genetic assignment of individuals to source populations using network estimation tools

The use of in vivo haploid induction system makes the doubled haploid (DH) technology easier to adopt for the conventional maize breeders. However, despite having played an important role in the initial developmental phases of DH technology, Indian maize research has yet to harvest its benefits. Haploid Inducer Lines (HILs) developed by CIMMYT are being widely used in maize breeding programmes in many countries including India. There, however, is no published information on the efficiency of DH line production using CIMMYT HILs in Indian maize breeding programmes. In the present study, the efficiency of DH production using CIMMYT’s tropically adapted inducer line TAILP1 was investigated with eight source populations including two of sweet corn. The average haploid induction rate (HIR) of TAILP1 was 5.48% with a range of 2.01 to 10.03%. Efficiency of DH production ranged from 0.14 to 1.87% for different source populations with an average of 1.07%. The information generated will be useful for maize breeders intending to use DH technology for accelerated development of completely homozygous lines.

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Effect of captivity on morphology: negligible changes in external morphology mask significant changes in internal morphology

Royal Society Open Science ◽

10.1098/rsos.172470 ◽

2018 ◽

Vol 5 (5) ◽

pp. 172470 ◽

Cited By ~ 3

Author(s):

Stephanie K. Courtney Jones ◽

Adam J. Munn ◽

Phillip G. Byrne

Keyword(s):

Sexual Dimorphism ◽

Captive Breeding ◽

Morphological Changes ◽

External Morphology ◽

Wild Animals ◽

Internal Morphology ◽

In Captivity ◽

Two Generations ◽

Breeding Programmes ◽

Source Populations

Captive breeding programmes are increasingly relied upon for threatened species management. Changes in morphology can occur in captivity, often with unknown consequences for reintroductions. Few studies have examined the morphological changes that occur in captive animals compared with wild animals. Further, the effect of multiple generations being maintained in captivity, and the potential effects of captivity on sexual dimorphism remain poorly understood. We compared external and internal morphology of captive and wild animals using house mouse ( Mus musculus ) as a model species. In addition, we looked at morphology across two captive generations, and compared morphology between sexes. We found no statistically significant differences in external morphology, but after one generation in captivity there was evidence for a shift in the internal morphology of captive-reared mice; captive-reared mice (two generations bred) had lighter combined kidney and spleen masses compared with wild-caught mice. Sexual dimorphism was maintained in captivity. Our findings demonstrate that captive breeding can alter internal morphology. Given that these morphological changes may impact organismal functioning and viability following release, further investigation is warranted. If the morphological change is shown to be maladaptive, these changes would have significant implications for captive-source populations that are used for reintroduction, including reduced survivorship.

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Functional network estimation using multigraph learning with application to brain maturation study

Human Brain Mapping ◽

10.1002/hbm.25410 ◽

2021 ◽

Author(s):

Junqi Wang ◽

Li Xiao ◽

Wenxing Hu ◽

Gang Qu ◽

Tony W. Wilson ◽

...

Keyword(s):

Functional Network ◽

Brain Maturation ◽

Network Estimation

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Network estimation of multi-dimensional binary variables with application to divorce data

Journal of Physics Conference Series ◽

10.1088/1742-6596/1978/1/012056 ◽

2021 ◽

Vol 1978 (1) ◽

pp. 012056

Author(s):

Yihe Yang ◽

Renwen Luo ◽

Bing Guo ◽

Yingting Luo ◽

Jianxin Pan

Keyword(s):

Binary Variables ◽

Network Estimation

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Bioinvasions of the Medfly Ceratitis capitata: Source Estimation Using DNA Sequences at Multiple Intron Loci

Genetics ◽

10.1093/genetics/153.1.351 ◽

1999 ◽

Vol 153 (1) ◽

pp. 351-360 ◽

Cited By ~ 3

Author(s):

Neil Davies ◽

Francis X Villablanca ◽

George K Roderick

Keyword(s):

Population Structure ◽

Latin America ◽

Dna Sequences ◽

Ceratitis Capitata ◽

Fruit Fly ◽

Ecological Processes ◽

The Status ◽

Considerable Controversy ◽

Source Populations ◽

Traditional Population

Abstract The Mediterranean fruit fly, Ceratitis capitata, is a devastating agricultural pest that threatens to become established in vulnerable areas such as California and Florida. Considerable controversy surrounds the status of Californian medfly infestations: Do they represent repeated introductions or the persistence of a resident population? Attempts to resolve this question using traditional population genetic markers and statistical methods are problematic because the most likely source populations in Latin America were themselves only recently colonized and are genetically very similar. Here, significant population structure among several New World medfly populations is demonstrated through the analysis of DNA sequence variation at four intron loci. Surprisingly, in these newly founded populations, estimates of population structure increase when measures of subdivision take into account the relatedness of alleles as well as their frequency. A nonequilibrium, likelihood-based statistical test that utilizes multilocus genotypes suggests that the sole medfly captured in California during 1996 was introduced from Latin America and was less likely to be a remnant of an ancestral Californian population. Many bioinvasions are hierarchical in nature, consisting of several sequential or overlapping invasion events, the totality of which can be termed a metainvasion. Phylogenetic data from multilocus DNA sequences will be vital to understanding the evolutionary and ecological processes that underlie metainvasions and to resolving their constituent levels.

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