PhD theses

All Wageningen University PhD theses

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    Wageningen PhD theses


    This database contains bibliographic descriptions of all Wageningen University PhD theses from 1920 onwards. It is updated on a daily basis by WUR Library.

    Author abstracts and/or summaries are added to all descriptions. A link to the full text dissertation is added to the bibliographic description. In a few cases, no electronic version is available, mostly because of copyright issues.

    Hard copies of all theses are available for loan at WUR Library. To request them, click the link Request this publication in the full record presentation. This is a fee based service.

    mail icon WUR Library, 9 july 2012

     

Records 1 - 20 / 30

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Sodium and protein nutrition of lactating cows under tropical conditions [PhD thesis]
Thiangtum, Wandee \ 2018
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Changes in water requirements of dry season rice under climate change : quantifying recent & future changes and developing adaptation strategies in Northwest Bangladesh [PhD thesis]
Full text publicly available; under embargo until:2020-12-11
Acharjee, Tapos Kumar \ 2018
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Identification of metabolites involved in heat stress response in different tomato genotypes [PhD thesis]
Paupière, Marine J. \ 2017
solanum lycopersicum - tomatoes - genotypes - heat stress - heat tolerance - pollen - metabolomes - metabolites - metabolomics
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Physiological responses of rice to increased day and night temperatures [PhD thesis]
Shi, Wanju \ 2017
crops - rice - oryza sativa - plant physiology - temperature - crop yield - grain - agronomy
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Building towards a multi-dimensional genetic architecture in Caenorhabditis elegans [PhD thesis]
Sterken, Mark G. \ 2016
caenorhabditis elegans - genetic models - introgression - genetic variation - quantitative trait loci - animal viruses - inheritance - rna interference - viral replication - gene expression
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Impact of microbial variability on food safety and quality [PhD thesis]
Chandra Aryani, Diah \ 2016
listeria monocytogenes - lactobacillus plantarum - growth analysis - kinetics - growth models - inactivation - heat stress - strain differences - food safety - milk - ham - microbial diversity - food quality
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Heat stress tolerance responses in developing tomato anthers [PhD thesis]
Bita, Craita Elena \ 2016
tomatoes - solanum lycopersicum - anthers - heat stress - stress tolerance - heat tolerance - heat shock - transcriptomics - reproductive performance - gene expression profiling - meiosis

Abstract:
Generally, tomato is considered sensitive to heat stress. During the development of the tomato male gametophyte, anther development and particularly the first stage of meiosis are the most sensitive phases. Our goal was to analyse the general molecular response to moderate heat stress (MHS) in tomato meiotic anthers and then characterise aspects of the response to heat in tolerant genotypes. Understanding the metabolic changes that occur in heat tolerant varieties/lines during heat stress is essential for the production of tomato crops adapted to variable temperature increases. First, cDNA-AFLP was employed to reveal a general spatial and temporal response to MHS in a standard cultivar. The results showed about 1% of the analysed genes having significant modulation (down-regulation) in expression after just 2h of stress. Several transcripts were identified and associated to a response to heat. Additional analyses revealed that the candidate genes are expressed in the tapetum, but also in other tissues (Chapter 3). The Combimatrix technology has been used to fingerprint differences in response to heat between a tolerant and a sensitive genotype, with the aim of detecting candidate tolerance genes. The microarray analysis also shows about 1% of the genes having a significant modulation in expression after 2h of stress, and that the tolerant genotype reacts with fewer transcriptomic changes and exhibiting high constitutive levels of transcripts involved in protection and thermotolerance. In the heat-tolerant genotype, the majority of changes in gene expression is represented by up-regulation, while in the heat-sensitive genotype there is a general trend to down-regulate gene expression, soon after MHS. The putative functions associated with the genes identified by cDNA-AFLP or microarrays indicate involvement of heat shock, metabolism, antioxidant and development pathways. Based upon the observed differences in response to MHS and on literature sources, we identified a number of candidate transcripts involved in heat-tolerance. A functional analysis of expression modulation by qRT-PCR was performed in several pairs of genotypes and the results confirm observations from microarray regarding gene modulation (Chapter 4). An experimental approach to obtain insight into the hormonal regulation of the response to heat is described in chapter 5. Additional observations and results are discussed in chapter 6.

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Using natural variation to unravel the dynamic regulation of plant performance in diverse environments [PhD thesis]
Bac-Molenaar, J.A. \ 2015
plants - genomes - quantitative trait loci - heat stress - genetic mapping - growth - drought - plant genetics - plant physiology
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Urban heat : natural and anthropogenic factors influencing urban air temperatures [PhD thesis]
Theeuwes, N.E. \ 2015
microclimate - heat stress - air temperature - urban environment - meteorology
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Biochemical, physiological and molecular responses of Ricinus communis seeds and seedlings to different temperatures: a multi-omics approach [PhD thesis]
Ribeiro de Jesus, P.R. \ 2015
ricinus communis - seeds - seedlings - plant physiology - temperature - molecular biology - gene expression - seed germination - seedling emergence
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Worms under stress: unravelling genetic complex traits through perturbation [PhD thesis]
Rodriguez Sanchez, M. \ 2014
caenorhabditis elegans - genetics - animal models - stress - heat stress - stress response - genetic variation
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Microspore embryogenesis: reprogramming cell fate from pollen to embryo development [PhD thesis]
Hui Li \ 2014
pollen - embryogenesis - embryonic development - biological development - plant development - in vitro culture - plant embryos - brassica napus
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Snow shoes and sandals? : genetic aspects of heat stress sensitivity and sow reproduction [PhD thesis]
Bloemhof, S. \ 2013
sows - heat stress - animal genetics - sensitivity - sexual reproduction - reproductive performance - critical temperature - heat tolerance - selective breeding - genetic correlation - breeding programmes - pig breeding
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Stress responses and digestive tract robustness of Lactobacillus plantarum [PhD thesis]
Bokhorst-van de Veen, H. van \ 2013
lactobacillus plantarum - stress response - digestive tract - gene regulation - adaptation
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Living on the edge: physiological and behavioural plasticity of African antelopes along a climatic gradient [PhD thesis]
Shrestha, A.K. \ 2012
antelopes - taurotragus oryx - connochaetes taurinus - aepyceros melampus - climatic change - microclimate - animal behaviour - thermoregulation - microhabitats - heat stress - adaptation physiology
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Apical dominance and growth in vitro of Alstroemeria [PhD thesis]
Pumisutapon, P. \ 2012
alstroemeria - vegetative propagation - in vitro culture - micropropagation - plant physiology - apical dominance - growing media - stress - plant growth regulators
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Effects of dietary changes on heat stress in broiler and Kampung chickens [PhD thesis]
Syafwan, [W.] \ 2012
broilers - fowls - fowl feeding - animal nutrition - diets - feeds - heat stress - feeding behaviour - broiler performance - nutrition physiology
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Adaptive management of irrigated rice in the changing environments of the Sahel [PhD thesis]
Vries, M.E. de \ 2011
oryza sativa - rice - irrigated farming - irrigation - climatic change - simulation models - genotype environment interaction - senegal - sahel
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Putting the Phytophthora infestans genome sequence at work; multiple novel avirulence and potato resistance gene candidates revealed [PhD thesis]
Rietman, H. \ 2011
solanum tuberosum - potatoes - plant pathogenic fungi - phytophthora infestans - functional genomics - genes - disease resistance - plant-microbe interactions
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Adaptive models for operational use in dairy farming : increasing economic results utilising individual variation in response [PhD thesis]
André, G. \ 2011
dairy farming - dairy performance - farm results - milk yield - dairy cows - dynamic models - milking interval - milk production - feed intake - milking rate - netherlands

Abstract:
During the last century in the Netherlands milk production per cow has almost tripled. Accordingly, the amount of concentrates yearly fed per cow strongly increased. Furthermore, automation and robotisation has changed dairy management, especially by the introduction of automatic concentrate feeders and milking systems. A new management concept, emerging in the last decades, is Precision Livestock Farming (PLF). The objective of PLF is to optimize livestock production, by on-line monitoring and control of the production process, utilizing the technical possibilities of automation and robotisation. Nowadays, individual settings for daily concentrate supply and milking frequency are based on standards, ignoring individual variation in milk yield response on concentrate intake and milking frequency. This leads to the main hypothesis for this thesis research that profitability of dairy farming can be improved by utilizing information on individual variation in response. The first objective of this research was to quantify the individual variation in milk yield response to concentrate intake and milking interval length, in order to assess the economic prospects of applying individual optimal settings for concentrate supply and milking frequency. The second objective was the development and testing of adaptive models for on-line estimation of the actual individual response in milk yield to concentrate intake and milking interval length. The conclusion is that on-line estimation of the actual individual response in milk yield and milking duration is possible following a Bayesian approach for time series using an adaptive dynamic model. Besides estimation of the actual response the Bayesian approach adequately detects process deteriorations. Therefore, adaptive dynamic models provide a useful tool for control and monitoring of the dairy production process.

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