Paternity analysis - Revision history

Raj at 04:23, 21 November 2016

2016-11-21T04:23:05Z

← Older revision		Revision as of 04:23, 21 November 2016
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	[[Category:Publication]]		[[Category:Publication]]
	[[Category:Pollen ~~Dynamics~~]]		[[Category:Pollen]]

Raj: /* Introduction */

2010-01-05T19:06:44Z

Introduction

← Older revision		Revision as of 19:06, 5 January 2010
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	There are many methods proposed to study the outcrossing rate in a population in which, Deoxyribonucleic acid (DNA) polymorphisms provide a powerful tool for quantifying the existing levels of outcrossing in breeding and production populations of forest trees. Several molecular marker technologies are available today, to perform the paternity analysis, of which simple sequence repeats (SSR) has proven to the most appropriate marker system. SSRs are also known as microsatellites, is certainly the most efficient way of resolving issues of identity. SSRs are typically co dominant and multiallelic, with expected heterozygosity frequently greater than 0.7, allowing precise discrimination even of closely related individuals. Due to the specificity of the PCR assay and its high information content, it also allows the determination of identity between individuals based on formal estimates derived from allele frequencies. As microsatellite marker information can be easily shared between laboratories based on primer sequences, inter laboratory comparisons of data are straightforward, improving co-operative efforts in the standardization of data. SSRs have been the most practical marker system to determine the outcrossing rate in the population, unfortunately there is no published data on the development of SSR markers in E. camaldulensis.		There are many methods proposed to study the outcrossing rate in a population in which, Deoxyribonucleic acid (DNA) polymorphisms provide a powerful tool for quantifying the existing levels of outcrossing in breeding and production populations of forest trees. Several molecular marker technologies are available today, to perform the paternity analysis, of which simple sequence repeats (SSR) has proven to the most appropriate marker system. SSRs are also known as microsatellites, is certainly the most efficient way of resolving issues of identity. SSRs are typically co dominant and multiallelic, with expected heterozygosity frequently greater than 0.7, allowing precise discrimination even of closely related individuals. Due to the specificity of the PCR assay and its high information content, it also allows the determination of identity between individuals based on formal estimates derived from allele frequencies. As microsatellite marker information can be easily shared between laboratories based on primer sequences, inter laboratory comparisons of data are straightforward, improving co-operative efforts in the standardization of data. SSRs have been the most practical marker system to determine the outcrossing rate in the population, unfortunately there is no published data on the development of SSR markers in E. camaldulensis.

	In the present investigation, we have estimated the out crossing rate of 8 selected individuals from clonal seed orchard using SSR ~~marker system~~ to ascertain the reproductive success of selected individuals		In the present investigation, we have estimated the out crossing rate of 8 selected individuals from clonal seed orchard using SSR markers to ascertain the reproductive success of selected individuals

	=Keywords=		=Keywords=

Raj: /* Discussion */

2010-01-05T18:46:56Z

Discussion

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	=Discussion=		=Discussion=
			=Fig=

	=References=		=References=

Raj: /* Introduction */

2010-01-05T16:45:24Z

Introduction

← Older revision		Revision as of 16:45, 5 January 2010
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	There are many methods proposed to study the outcrossing rate in a population in which, Deoxyribonucleic acid (DNA) polymorphisms provide a powerful tool for quantifying the existing levels of outcrossing in breeding and production populations of forest trees. Several molecular marker technologies are available today, to perform the paternity analysis, of which simple sequence repeats (SSR) has proven to the most appropriate marker system. SSRs are also known as microsatellites, is certainly the most efficient way of resolving issues of identity. SSRs are typically co dominant and multiallelic, with expected heterozygosity frequently greater than 0.7, allowing precise discrimination even of closely related individuals. Due to the specificity of the PCR assay and its high information content, it also allows the determination of identity between individuals based on formal estimates derived from allele frequencies. As microsatellite marker information can be easily shared between laboratories based on primer sequences, inter laboratory comparisons of data are straightforward, improving co-operative efforts in the standardization of data. SSRs have been the most practical marker system to determine the outcrossing rate in the population, unfortunately there is no published data on the development of SSR markers in E. camaldulensis.		There are many methods proposed to study the outcrossing rate in a population in which, Deoxyribonucleic acid (DNA) polymorphisms provide a powerful tool for quantifying the existing levels of outcrossing in breeding and production populations of forest trees. Several molecular marker technologies are available today, to perform the paternity analysis, of which simple sequence repeats (SSR) has proven to the most appropriate marker system. SSRs are also known as microsatellites, is certainly the most efficient way of resolving issues of identity. SSRs are typically co dominant and multiallelic, with expected heterozygosity frequently greater than 0.7, allowing precise discrimination even of closely related individuals. Due to the specificity of the PCR assay and its high information content, it also allows the determination of identity between individuals based on formal estimates derived from allele frequencies. As microsatellite marker information can be easily shared between laboratories based on primer sequences, inter laboratory comparisons of data are straightforward, improving co-operative efforts in the standardization of data. SSRs have been the most practical marker system to determine the outcrossing rate in the population, unfortunately there is no published data on the development of SSR markers in E. camaldulensis.

	In the present investigation, we have estimated the out crossing rate of 8 selected individuals from clonal seed orchard using SSR marker system to ~~acertain~~ the reproductive success of selected individuals		In the present investigation, we have estimated the out crossing rate of 8 selected individuals from clonal seed orchard using SSR marker system to ascertain the reproductive success of selected individuals

	=Keywords=		=Keywords=

Raj: /* Introduction */

2010-01-05T16:45:05Z

Introduction

← Older revision		Revision as of 16:45, 5 January 2010
Line 19:		Line 19:
	There are many methods proposed to study the outcrossing rate in a population in which, Deoxyribonucleic acid (DNA) polymorphisms provide a powerful tool for quantifying the existing levels of outcrossing in breeding and production populations of forest trees. Several molecular marker technologies are available today, to perform the paternity analysis, of which simple sequence repeats (SSR) has proven to the most appropriate marker system. SSRs are also known as microsatellites, is certainly the most efficient way of resolving issues of identity. SSRs are typically co dominant and multiallelic, with expected heterozygosity frequently greater than 0.7, allowing precise discrimination even of closely related individuals. Due to the specificity of the PCR assay and its high information content, it also allows the determination of identity between individuals based on formal estimates derived from allele frequencies. As microsatellite marker information can be easily shared between laboratories based on primer sequences, inter laboratory comparisons of data are straightforward, improving co-operative efforts in the standardization of data. SSRs have been the most practical marker system to determine the outcrossing rate in the population, unfortunately there is no published data on the development of SSR markers in E. camaldulensis.		There are many methods proposed to study the outcrossing rate in a population in which, Deoxyribonucleic acid (DNA) polymorphisms provide a powerful tool for quantifying the existing levels of outcrossing in breeding and production populations of forest trees. Several molecular marker technologies are available today, to perform the paternity analysis, of which simple sequence repeats (SSR) has proven to the most appropriate marker system. SSRs are also known as microsatellites, is certainly the most efficient way of resolving issues of identity. SSRs are typically co dominant and multiallelic, with expected heterozygosity frequently greater than 0.7, allowing precise discrimination even of closely related individuals. Due to the specificity of the PCR assay and its high information content, it also allows the determination of identity between individuals based on formal estimates derived from allele frequencies. As microsatellite marker information can be easily shared between laboratories based on primer sequences, inter laboratory comparisons of data are straightforward, improving co-operative efforts in the standardization of data. SSRs have been the most practical marker system to determine the outcrossing rate in the population, unfortunately there is no published data on the development of SSR markers in E. camaldulensis.

	In the present investigation, we have estimated the ~~outcrossing~~ rate of 8 selected individuals from clonal seed orchard using SSR marker system to acertain the ~~fecundity~~ of selected individuals		In the present investigation, we have estimated the out crossing rate of 8 selected individuals from clonal seed orchard using SSR marker system to acertain the reproductive success of selected individuals

	=Keywords=		=Keywords=

Raj: /* Materials and methods */

2010-01-05T16:43:34Z

Materials and methods

← Older revision		Revision as of 16:43, 5 January 2010
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	In the present investigation, we have estimated the outcrossing rate of 8 selected individuals from clonal seed orchard using SSR marker system to acertain the fecundity of selected individuals		In the present investigation, we have estimated the outcrossing rate of 8 selected individuals from clonal seed orchard using SSR marker system to acertain the fecundity of selected individuals

			=Keywords=
			Eucalyptus camaldulensis, mating system, outcrossing rate, microsatellite markers

	=Materials and methods=		=Materials and methods=

Raj: /* Introduction */

2010-01-05T16:38:57Z

Introduction

← Older revision		Revision as of 16:38, 5 January 2010
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	There are many methods proposed to study the outcrossing rate in a population in which, Deoxyribonucleic acid (DNA) polymorphisms provide a powerful tool for quantifying the existing levels of outcrossing in breeding and production populations of forest trees. Several molecular marker technologies are available today, to perform the paternity analysis, of which simple sequence repeats (SSR) has proven to the most appropriate marker system. SSRs are also known as microsatellites, is certainly the most efficient way of resolving issues of identity. SSRs are typically co dominant and multiallelic, with expected heterozygosity frequently greater than 0.7, allowing precise discrimination even of closely related individuals. Due to the specificity of the PCR assay and its high information content, it also allows the determination of identity between individuals based on formal estimates derived from allele frequencies. As microsatellite marker information can be easily shared between laboratories based on primer sequences, inter laboratory comparisons of data are straightforward, improving co-operative efforts in the standardization of data. SSRs have been the most practical marker system to determine the outcrossing rate in the population, unfortunately there is no published data on the development of SSR markers in E. camaldulensis.		There are many methods proposed to study the outcrossing rate in a population in which, Deoxyribonucleic acid (DNA) polymorphisms provide a powerful tool for quantifying the existing levels of outcrossing in breeding and production populations of forest trees. Several molecular marker technologies are available today, to perform the paternity analysis, of which simple sequence repeats (SSR) has proven to the most appropriate marker system. SSRs are also known as microsatellites, is certainly the most efficient way of resolving issues of identity. SSRs are typically co dominant and multiallelic, with expected heterozygosity frequently greater than 0.7, allowing precise discrimination even of closely related individuals. Due to the specificity of the PCR assay and its high information content, it also allows the determination of identity between individuals based on formal estimates derived from allele frequencies. As microsatellite marker information can be easily shared between laboratories based on primer sequences, inter laboratory comparisons of data are straightforward, improving co-operative efforts in the standardization of data. SSRs have been the most practical marker system to determine the outcrossing rate in the population, unfortunately there is no published data on the development of SSR markers in E. camaldulensis.

	In ~~this study~~, we have ~~investigated~~ outcrossing rate of 8 selected individuals from clonal seed orchard using SSR marker system ~~by analyzing the multilocus profiles of 200 individuals of a E. camaldulensis CSO . Our main objectives are~~		In the present investigation, we have estimated the outcrossing rate of 8 selected individuals from clonal seed orchard using SSR marker system to acertain the fecundity of selected individuals

	~~1.To develop and validate in-silico SSR markers in E. camaldulensis~~
	~~2.To determine~~ the fecundity ~~of a clonal seed orchard to selected 8 individuals with high fertility~~
	~~3.To estimate the outcrossing rate of 8 selected individuals using 25 progenies from each individuals using SSR markers~~
	~~4.To establish the correlation between outcrossing and fertility~~ of selected individuals
	~~5.To propose the model seed orchard based on the outcrossing rate~~

	=Materials and methods=		=Materials and methods=

Raj: /* References */

2010-01-05T16:24:06Z

References

Show changes

Raj: /* References */

2010-01-05T16:22:54Z

References

Show changes

Raj: /* Introduction */

2010-01-05T16:18:08Z

Introduction

← Older revision		Revision as of 16:18, 5 January 2010
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	=Introduction=		=Introduction=
			Eucalyptus camaldulensis Dehnh. (River Red Gum) is the introduced and most widespread eucalypt, occurring in India. Eucalypts are raised extensively as pulpwood plantations and the prime objective of an improvement program is to enhance wood and pulp yield. Improvement through clonal forestry of superior types takes the advantage of immediate gain, however handicapped with the progressive gain in the subsequent generations. Seed orchards have proven to be the better strategy of maintaining the breeding population for the sustainable improvement, where the genetic gain is slow, but progressive.

			In seed orchard, the differential family performance has been attributed to possible inbreeding depression resulting from selfing and/or mating between relatives (Hodge et al., 1996). Direct comparisons of growth rates of self pollinated and out crossed eucalypts have demonstrated negative effects of inbreeding on seed viability and growth (Hodgson, 1976; Grigffin and Cotterill, 1988; Hardner and Potts, 1995). A positive association between outcrossing rate and growth has also been reported in many Eucalypt species. The differences in growth and survival among families and populations of E. camaldulensis raised the question of whether this variation could be explained by differences in outcrossing rates.

			Despite extensive plantings of E. camaldulensis in India and the establishment of breeding programs, reports of outcrossing rates in this species have been limited. The species is hermaphrodite and insect pollinated with bees, both native (Trigona spp.) and honey bees (Apis mellifera), the main pollinators. In common with other eucalypts, E. camaldulensis has a mixed mating system. Individual flowers are protandrous, but geitonogamous pollinations can occur as flowers on the same tree develop at different times. The outcrossing rate for seed crops from individual trees is influenced by a variety of genetic and environmental factors including self-incompatibility, flowering phenology relative to neighboring trees in the stand, heterogeneity in the pollen pool and ecological factors, which influence the pollinator activity.

			Outcrossing rates determine the coefficient of relationship, which is used in calculations of heritability and expected genetic gain from open-pollinated progeny trials. Reports of moderate levels of inbreeding in eucalypts led to suggest that genetic improvement may be less than expected using recurrent selection from open pollinated seed orchards. Inbreeding would reduce the number of new combinations of genotypes on which future genetic gain by selection depends, whether from seed orchards or plantations. In addition, when populations are partially inbred and exhibit inbreeding depression for fitness components, the quantitative genetic parameters estimated may not reflect the evolutionary potential of these populations. Additive genetic variance will be over-estimated if the parental population is structured (leading to heterogeneity in the pollen pool), or there is a substantial degree of inbreeding. This, in turn will bias estimates of heritability and genetic gain.

			Mating patterns, including pollen dispersal and gene flow within and between populations, are important parameters for understanding the genetic structure of plants. In addition to their importance to population genetics and evolutionary biology, patterns of gene movement by pollen dispersal are of practical significance to forestry (Adams et al. 1992). Knowledge of mating patterns in natural populations is important for assessing the genetic composition of seed collected from natural stands for inclusion in breeding programs (Kitzmiller 1990) and for formulation of gene conservation strategies including number and distribution of parent trees for seed collections or distances required to isolate forest preserves (Ledig 1986).

			There are many methods proposed to study the outcrossing rate in a population in which, Deoxyribonucleic acid (DNA) polymorphisms provide a powerful tool for quantifying the existing levels of outcrossing in breeding and production populations of forest trees. Several molecular marker technologies are available today, to perform the paternity analysis, of which simple sequence repeats (SSR) has proven to the most appropriate marker system. SSRs are also known as microsatellites, is certainly the most efficient way of resolving issues of identity. SSRs are typically co dominant and multiallelic, with expected heterozygosity frequently greater than 0.7, allowing precise discrimination even of closely related individuals. Due to the specificity of the PCR assay and its high information content, it also allows the determination of identity between individuals based on formal estimates derived from allele frequencies. As microsatellite marker information can be easily shared between laboratories based on primer sequences, inter laboratory comparisons of data are straightforward, improving co-operative efforts in the standardization of data. SSRs have been the most practical marker system to determine the outcrossing rate in the population, unfortunately there is no published data on the development of SSR markers in E. camaldulensis.

			In this study, we have investigated outcrossing rate of 8 selected individuals from clonal seed orchard using SSR marker system by analyzing the multilocus profiles of 200 individuals of a E. camaldulensis CSO . Our main objectives are

			1.To develop and validate in-silico SSR markers in E. camaldulensis
			2.To determine the fecundity of a clonal seed orchard to selected 8 individuals with high fertility
			3.To estimate the outcrossing rate of 8 selected individuals using 25 progenies from each individuals using SSR markers
			4.To establish the correlation between outcrossing and fertility of selected individuals
			5.To propose the model seed orchard based on the outcrossing rate

	=Materials and methods=		=Materials and methods=