Population dynamics in introgression of wild male sterile cytoplasm into Brassica oleracea: a small population based breeding modelr

2018 ◽  
Vol 232 ◽  
pp. 231-239 ◽  
Author(s):  
S.S. Dey ◽  
R. Bhatia ◽  
S.R. Sharma ◽  
Kanika Sharma ◽  
Chander Parkash ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Brassica Oleracea ◽  
Population Based ◽  
Small Population ◽  
Male Sterile ◽  
Wild Male ◽  
Male Sterile Cytoplasm

scholarly journals A Model for Analysing the Collective Dynamic Behaviour and Characterising the Exploitation of Population-Based Algorithms

2014 ◽  
Vol 22 (1) ◽  
pp. 159-188 ◽  
Author(s):  
Mikdam Turkey ◽  
Riccardo Poli
Keyword(s):  
Population Dynamics ◽  
Dynamic Behaviour ◽  
Fitness Landscape ◽  
Population Based ◽  
Levels Of Abstraction ◽  
Collective Dynamic ◽  
Model Studies ◽  
Proposed Model ◽  
Wide Range ◽  
Multiple Levels

Several previous studies have focused on modelling and analysing the collective dynamic behaviour of population-based algorithms. However, an empirical approach for identifying and characterising such a behaviour is surprisingly lacking. In this paper, we present a new model to capture this collective behaviour, and to extract and quantify features associated with it. The proposed model studies the topological distribution of an algorithm's activity from both a genotypic and a phenotypic perspective, and represents population dynamics using multiple levels of abstraction. The model can have different instantiations. Here it has been implemented using a modified version of self-organising maps. These are used to represent and track the population motion in the fitness landscape as the algorithm operates on solving a problem. Based on this model, we developed a set of features that characterise the population's collective dynamic behaviour. By analysing them and revealing their dependency on fitness distributions, we were then able to define an indicator of the exploitation behaviour of an algorithm. This is an entropy-based measure that assesses the dependency on fitness distributions of different features of population dynamics. To test the proposed measures, evolutionary algorithms with different crossover operators, selection pressure levels and population handling techniques have been examined, which lead populations to exhibit a wide range of exploitation-exploration behaviours.

A rotation design to reduce weed density in organic farming

2010 ◽  
Vol 25 (3) ◽  
pp. 189-195 ◽  
Author(s):  
Randy L. Anderson
Keyword(s):  
Population Dynamics ◽  
Organic Farming ◽  
Weed Management ◽  
Crop Production ◽  
Soil Health ◽  
Population Based ◽  
Weed Population ◽  
Weed Density ◽  
Organic Systems ◽  
Herbicide Use

AbstractWeeds are a major obstacle to successful crop production in organic farming. Producers may be able to reduce inputs for weed management by designing rotations to disrupt population dynamics of weeds. Population-based management in conventional farming has reduced herbicide use by 50% because weed density declines in cropland across time. In this paper, we suggest a 9-year rotation comprised of perennial forages and annual crops that will disrupt weed population growth and reduce weed density in organic systems. Lower weed density will also improve effectiveness of weed control tactics used for an individual crop. The rotation includes 3-year intervals of no-till, which will improve both weed population management and soil health. Even though this rotation has not been field tested, it provides an example of designing rotations to disrupt population dynamics of weeds. Also, producers may gain additional benefits of higher crop yield and increased nitrogen supply with this rotation design.

Chimeric mitochondrial genes expressed in the C male-sterile cytoplasm of maize

1991 ◽  
Vol 20 (6) ◽  
pp. 475-482 ◽  
Author(s):  
R. E. Dewey ◽  
D. H. Timothy ◽  
C. S. Levings
Keyword(s):  
Mitochondrial Genes ◽  
Male Sterile ◽  
Male Sterile Cytoplasm

Fertility Restoration of Male‐Sterile Cytoplasm in Wild Sunflowers 1

Crop Science ◽  
1975 ◽  
Vol 15 (5) ◽  
pp. 724-726 ◽  
Author(s):  
Juan Dominguez Gimenez ◽  
Gerhardt N. Fick
Keyword(s):  
Fertility Restoration ◽  
Male Sterile ◽  
Male Sterile Cytoplasm
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