Genetic Diversity and Modern Plant Breeding

2015 ◽  
pp. 55-88 ◽  
Author(s):  
Stephen Smith ◽  
David Bubeck ◽  
Barry Nelson ◽  
Jason Stanek ◽  
Justin Gerke
Keyword(s):  
Genetic Diversity ◽  
Plant Breeding

Estimation of genetic diversity and its exploitation in plant breeding

2021 ◽  
Author(s):  
Hausila Prasad Singh ◽  
Om Prakash Raigar ◽  
Rakesh Kumar Chahota
Keyword(s):  
Genetic Diversity ◽  
Plant Breeding

scholarly journals Demonstration of targeted crossovers in hybrid maize using CRISPR technology

2021 ◽  
Author(s):  
Andrei Kouranov ◽  
Charles Armstrong ◽  
Ashok Shrawat ◽  
Vladimir Sidorov ◽  
Scott Huesgen ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Plant Breeding ◽  
Genetic Gain ◽  
Somatic Cells ◽  
Naturally Occurring ◽  
Hybrid Plants ◽  
Key Driver ◽  
The Creation ◽  
Hybrid Maize ◽  
Trait Introgression

Abstract Naturally occurring chromosomal crossovers (CO) during meiosis are a key driver of genetic diversity. The ability to target CO at specific allelic loci in hybrid plants would provide a significant advantage to the plant breeding process by facilitating trait introgression, and potentially increasing the rate of genetic gain. We present the first demonstration of targeted CO in hybrid maize utilizing the CRISPR Cas12a system. Our experiments showed that stable and heritable targeted CO can be produced in F1 somatic cells using Cas12a at a significantly higher rate than the natural CO in the same interval. These results are a step towards the use of RNA guided nuclease technology to simplify the creation of targeted genome combinations in progeny and accelerate breeding.

Genetic diversity is indispensable for plant breeding to improve crops

Crop Science ◽  
2020 ◽  
Author(s):  
Shilpa Swarup ◽  
Edward J. Cargill ◽  
Kate Crosby ◽  
Lex Flagel ◽  
Joel Kniskern ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Plant Breeding

Molecular assessment of maize inbred lines (Zea mays L.) Using microsatellite markers

2018 ◽  
Vol 43 (4) ◽  
pp. 533-542
Author(s):  
Maniruzzaman ◽  
MG Azam ◽  
S Islam ◽  
MG Hossain ◽  
MM Rohman
Keyword(s):  
Genetic Diversity ◽  
Plant Breeding ◽  
Genetic Relatedness ◽  
Agricultural Research ◽  
Inbred Lines ◽  
The Other ◽  
Diversity Analysis ◽  
Genetic Diversity Analysis ◽  
Maize Inbred Lines ◽  
Maize Genotypes

Genetic diversity analysis and germplasm characterization are essential steps in plant breeding and molecular markers are proved tool to accomplish. The present study was undertaken at the Molecular Breeding Lab of Plant Breeding Division, Bangladesh Agricultural Research Institute (BARI) to determine the genetic relatedness and molecular characterization of 15 maize inbred lines of BARI. In present study, genetic diversity analysis was performed by using 10 SSR primers to evaluate the polymorphisms, among them six primers showed distinct polymorphism between the maize inbred lines. The maize genotypes E81, E144, E08, E167, E102, E142 and E121 were found more diverged (0.9003) compared to other inbred lines. On the other hand, the lowest genetic distance values (0.1501) were found between the genotype E140 and genotype E80 followed by genotype E126 and genotype E140; genotype E140 and genotype E65; genotype E65 and genotype E80 values were identical (0.4502). The genotypes viz. E81, E144, E08, E167, E102, E142 and E121 were found far away from centroid of the cluster and rest of the genotypes were placed around the centroid. The Principal Coordinate Analysis (PCO) helped to visualize four major clusters and showed that seven maize inbred lines (E81, E58, E08, E167, E102, E142 and E121) were far away from the other genotypes. In conclusion, SSR markers enabled discrimination among accessions and provided valuable information for future use in improvement of these genomic resources.Bangladesh J. Agril. Res. 43(4): 533-542, December 2018

Improved Livelihoods, Genetic Diversity and Farmer Participation: A Strategy for Rice Breeding in Rainfed Areas of India

1988 ◽  
Vol 24 (3) ◽  
pp. 311-320 ◽  
Author(s):  
D. M. Maurya ◽  
A. Bottrall ◽  
J. Farrington
Keyword(s):  
Genetic Diversity ◽  
Plant Breeding ◽  
Alternative Strategy ◽  
Central Feature ◽  
Rice Breeding ◽  
Farmer Participation ◽  
Rice Varieties ◽  
New Varieties ◽  
On Farm ◽  
Traditional Rice

SUMMARYThe present structure of plant breeding and seed multiplication in India is highly centralized. Furthermore, only a small number of new varieties is officially released each year. The system therefore appears inappropriate for the requirements of the large proportion of Indian farmers located in risk-prone and highly diverse environments. An alternative strategy is described whose central feature is close matching of the characteristics of farmers' traditional rice varieties with those of advanced breeders' lines. A selection from these lines is then distributed in small quantities for on-farm trials managed by farmers themselves. If the success of these initial efforts is to be sustained, a more decentralized approach to breeding and multiplication will be necessary.

Impact of plant breeding on genetic diversity of the Canadian hard red spring wheat germplasm as revealed by EST-derived SSR markers

2006 ◽  
Vol 112 (7) ◽  
pp. 1239-1247 ◽  
Author(s):  
Yong-Bi Fu ◽  
Gregory W. Peterson ◽  
Ju-Kyung Yu ◽  
Lifeng Gao ◽  
Jizeng Jia ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Plant Breeding ◽  
Ssr Markers ◽  
Spring Wheat ◽  
Hard Red Spring Wheat ◽  
Wheat Germplasm

scholarly journals Winter wheat in England and Wales, 1923–1995: what do indices of genetic diversity reveal?

2003 ◽  
Vol 1 (1) ◽  
pp. 43-57 ◽  
Author(s):  
C. S. Srinivasan ◽  
Colin Thirtle ◽  
Paolo Palladino
Keyword(s):  
Genetic Diversity ◽  
Winter Wheat ◽  
Plant Breeding ◽  
Genetic Resources ◽  
Wheat Crop ◽  
England And Wales ◽  
Genealogical Relationship ◽  
Breeding Programmes ◽  
Winter Wheat Crop ◽  
The Stability

AbstractGenealogical data have been used very widely to construct indices with which to examine the contribution of plant breeding programmes to the maintenance and enhancement of genetic resources. In this paper we use such indices to examine changes in the genetic diversity of the winter wheat crop in England and Wales between 1923 and 1995. We find that, except for one period characterized by the dominance of imported varieties, the genetic diversity of the winter wheat crop has been remarkably stable. This agrees with many studies of plant breeding programmes elsewhere. However, underlying the stability of the winter wheat crop is accelerating varietal turnover without any significant diversification of the genetic resources used. Moreover, the changes we observe are more directly attributable to changes in the varietal shares of the area under winter wheat than to the genealogical relationship between the varieties sown. We argue, therefore, that while genealogical indices reflect how well plant breeders have retained and exploited the resources with which they started, these indices suffer from a critical limitation. They do not reflect the proportion of the available range of genetic resources which has been effectively utilized in the breeding programme: complex crosses of a given set of varieties can yield high indices, and yet disguise the loss (or non-utilization) of a large proportion of the available genetic diversity.

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