Screening of selected improved cassava varieties for bacterial blight and varietal performance under natural environment in Ibadan, south-western Nigeria

2016 ◽  
Vol 1 (2) ◽  
pp. 63-69
Author(s):  
J. N. Azorji ◽  
C. E. Igwe ◽  
C. Kanu
Keyword(s):  
Natural Environment ◽  
Bacterial Blight ◽  
Cassava Varieties

AFLP assessment of genetic variability in cassava accessions (Manihot esculenta) resistant and susceptible to the cassava bacterial blight (CBB)

Genome ◽  
1999 ◽  
Vol 42 (2) ◽  
pp. 163-172 ◽  
Author(s):  
Gilda Sanchez ◽  
Silvia Restrepo ◽  
Myriam-Cristina Duque ◽  
Martin Fregene ◽  
Merideth Bonierbale ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Manihot Esculenta ◽  
Bacterial Blight ◽  
Multiple Correspondence Analysis ◽  
Aflp Analysis ◽  
Resistance Screening ◽  
Base Resistance ◽  
Cassava Bacterial Blight ◽  
Xanthomonas Axonopodis ◽  
Cassava Varieties

Cassava bacterial blight (CBB) is caused by Xanthomonas axonopodis pv. manihotis (Xam). Resistance is found in Manihot esculenta and, in addition, has been introgressed from a wild relative, M. glaziovii. The resistance is thought to be polygenic and additively inherited. Ninety-three varieties of M. esculenta (Crantz) were assessed by AFLPs for genetic diversity and for resistance to CBB. AFLP analysis was performed using two primer combinations and a 79.2% level of polymorphism was found. The phenogram obtained showed between 74% and 96% genetic similarity among all cassava accessions analysed. The analysis permitted the unique identification of each individual. Two Xam strains were used for resistance screening. Variation in the reaction of cassava varieties to Xam strains was observed for all plant accessions. The correlation of resistance to both strains, had a coefficient of 0.53, suggesting the independence of resistance to each strain. Multiple correspondence analysis showed a random distribution of the resistance/susceptibility response with respect to overall genetic diversity as measured by AFLP analysis. A total heterozygosity index was calculated to determine the diversity within clusters as well as among them. Our results demonstrate that resistance to CBB is broadly distributed in cassava germplasm and that AFLP analysis is an effective and efficient means of providing quantitative estimates of genetic similarities among cassava accessions.Key words: amplified fragment length polymorphism, genetic base, resistance screening, Xanthomonas axonopodis pv. manihotis.

scholarly journals ASSESSMENT OF THREE CASSAVA VARIETIES RESPONSES TO CASSAVA BACTERIAL BLIGHT (CBB) IN THE SEVEN AGRO-ECOLOGICAL ZONES OF C?TE D?IVOIRE DURING A SURVEY IN 2017.

2019 ◽  
Vol 7 (9) ◽  
pp. 1220-1230
Author(s):  
Howele MichaelleAndreeCelestineToure ◽  
◽  
Kouadio JeanNestorEhui ◽  
Kouabenan Abo ◽  
Arthur MartinAffery ◽  
...  
Keyword(s):  
Bacterial Blight ◽  
Cassava Bacterial Blight ◽  
Ecological Zones ◽  
Cassava Varieties ◽  
Agro Ecological Zones

Random isn't real: How the patchy distribution of ecological rewards may generate “incentive hope”

2019 ◽  
Vol 42 ◽  
Author(s):  
Laurel Symes ◽  
Thalia Wheatley
Keyword(s):  
Natural Environment ◽  
Random Distribution ◽  
Spatiotemporal Distribution ◽  
Patchy Distribution ◽  
Distribution Of Resources

AbstractAnselme & Güntürkün generate exciting new insights by integrating two disparate fields to explain why uncertain rewards produce strong motivational effects. Their conclusions are developed in a framework that assumes a random distribution of resources, uncommon in the natural environment. We argue that, by considering a realistically clumped spatiotemporal distribution of resources, their conclusions will be stronger and more complete.

Extreme self-sacrifice beyond fusion: Moral expansiveness and the special case of allyship

2018 ◽  
Vol 41 ◽  
Author(s):  
Daniel Crimston ◽  
Matthew J. Hornsey
Keyword(s):  
General Theory ◽  
Biological Markers ◽  
Natural Environment ◽  
Relevant Dimension ◽  
Special Case

AbstractAs a general theory of extreme self-sacrifice, Whitehouse's article misses one relevant dimension: people's willingness to fight and die in support of entities not bound by biological markers or ancestral kinship (allyship). We discuss research on moral expansiveness, which highlights individuals’ capacity to self-sacrifice for targets that lie outside traditional in-group markers, including racial out-groups, animals, and the natural environment.

Philosophy and the Natural Environment

1994 ◽  
Author(s):  
Robin Attfield ◽  
Andrew Belsey
Keyword(s):  
Natural Environment

Measurement of some topographical aspects of smoking in the natural environment.

1983 ◽  
Author(s):  
Roy W. Pickens ◽  
Steven W. Gust ◽  
Philip M. Catchings ◽  
Dace S. Svikis
Keyword(s):  
Natural Environment
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