Does crop genetic diversity support positive biodiversity effects under experimental drought?

2021 ◽  
Author(s):  
Rob W. Brooker ◽  
Richard Hewison ◽  
Carolyn Mitchell ◽  
Adrian C. Newton ◽  
Robin J. Pakeman ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Crop Genetic Diversity ◽  
Biodiversity Effects

scholarly journals The current status and perspectives of on farm conservation of crop genetic diversity

2002 ◽  
Vol 10 (4) ◽  
pp. 409-415
Author(s):  
ZHU YouYong ◽  
Bao-Rong Lu ◽  
WANG YunYue ◽  
◽  
Keyword(s):  
Genetic Diversity ◽  
Current Status ◽  
On Farm Conservation ◽  
Crop Genetic Diversity ◽  
On Farm

Key issues facing genebanks in preserving crop genetic diversity ex situ: overview of the range of challenges

2021 ◽  
pp. 139-154
Author(s):  
Paula Bramel ◽  
Keyword(s):  
Genetic Diversity ◽  
Genetic Resources ◽  
Plant Genetic Resources ◽  
Cost Effective ◽  
Ex Situ ◽  
Crop Genetic Diversity ◽  
Ex Situ Collections ◽  
Key Issues ◽  
Market Preference ◽  
The Impact

This chapter reviews the key issues and challenges facing genebanks in preserving crop genetic diversity ex situ. Local crop genetic diversity is challenged with changes in land use, urbanization, land degradation, changes in agricultural practises, availability of improved varieties, changes in market preference, and the impact of climate change. Efforts have been made to secure plant genetic resources ex situ for future use but there are significant issues related to cost effective, efficient, secure, rational, and sustainable long-term ex situ conservation. It begins by addressing issues for the composition of ex situ collections and moves on to discuss issues for routine operations for conservation. The chapter also highlights issues for the use of conserved genetic resources, before concluding with a summary of why the development of sustainable genebank systems is so important.

Crop Genetic Diversity in the Tropical Coastal Areas

2019 ◽  
pp. 137-152
Author(s):  
Velmurugan Ayyam ◽  
Swarnam Palanivel ◽  
Sivaperuman Chandrakasan
Keyword(s):  
Genetic Diversity ◽  
Coastal Areas ◽  
Crop Genetic Diversity

scholarly journals Genetic Diversity and Population Structure of Cowpea [Vigna unguiculata (L.) Walp.] Germplasm Collected from Togo Based on DArT Markers

Genes ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1451
Author(s):  
Kodjo M. Gbedevi ◽  
Ousmane Boukar ◽  
Haruki Ishikawa ◽  
Ayodeji Abe ◽  
Patrick O. Ongom ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Genetic Improvement ◽  
Agricultural Research ◽  
Polymorphic Information Content ◽  
Germplasm Collection ◽  
Mean Value ◽  
Economic Life ◽  
Dart Markers ◽  
Crop Genetic Diversity

Crop genetic diversity is a sine qua non for continuous progress in the development of improved varieties, hence the need for germplasm collection, conservation and characterization. Over the years, cowpea has contributed immensely to the nutrition and economic life of the people in Togo. However, the bulk of varieties grown by farmers are landraces due to the absence of any serious genetic improvement activity on cowpea in the country. In this study, the genetic diversity and population structure of 255 cowpea accessions collected from five administrative regions and the agricultural research institute of Togo were assessed using 4600 informative diversity array technology (DArT) markers. Among the regions, the polymorphic information content (PIC) ranged from 0.19 to 0.27 with a mean value of 0.25. The expected heterozygosity (He) varied from 0.22 to 0.34 with a mean value of 0.31, while the observed heterozygosity (Ho) varied from 0.03 to 0.07 with an average of 0.05. The average inbreeding coefficient (FIS) varied from 0.78 to 0.89 with a mean value of 0.83, suggesting that most of the accessions are inbred. Cluster analysis and population structure identified four groups with each comprising accessions from the six different sources. Weak to moderate differentiation was observed among the populations with a genetic differentiation index varying from 0.014 to 0.117. Variation was highest (78%) among accessions within populations and lowest between populations (7%). These results revealed a moderate level of diversity among the Togo cowpea germplasm. The findings of this study constitute a foundation for genetic improvement of cowpea in Togo.

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