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Stress and food security

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https://www.readbyqxmd.com/read/28420201/a-transcriptomic-comparison-of-two-bambara-groundnut-landraces-under-dehydration-stress
#1
Faraz Khan, Hui Hui Chai, Ishan Ajmera, Charlie Hodgman, Sean Mayes, Chungui Lu
The ability to grow crops under low-water conditions is a significant advantage in relation to global food security. Bambara groundnut is an underutilised crop grown by subsistence farmers in Africa and is known to survive in regions of water deficit. This study focuses on the analysis of the transcriptomic changes in two bambara groundnut landraces in response to dehydration stress. A cross-species hybridisation approach based on the Soybean Affymetrix GeneChip array has been employed. The differential gene expression analysis of a water-limited treatment, however, showed that the two landraces responded with almost completely different sets of genes...
April 18, 2017: Genes
https://www.readbyqxmd.com/read/28418728/prevalence-and-predictors-of-food-insecurity-among-people-living-with-hiv-enrolled-in-antiretroviral-therapy-and-livelihood-programs-in-two-rural-zambian-hospitals
#2
Rainier Masa, Gina Chowa, Victor Nyirenda
The objective of this study was to examine the prevalence and predictors of food insecurity among people living with HIV (PLHIV) in two rural communities in Zambia. A cross-sectional sample of 101 PLHIV was surveyed using the Household Food Insecurity Access Scale. In multivariable linear regression models, income, household possessions, and perceived coping strategies were significantly associated with decreased food insecurity. Debt and perceived mental distress were significantly associated with increased food insecurity...
April 18, 2017: Ecology of Food and Nutrition
https://www.readbyqxmd.com/read/28398839/foundational-and-translational-research-opportunities-to-improve-plant-health
#3
Richard W Michelmore, Gitta Coaker, Rebecca Bart, Gwyn A Beattie, Andrew Bent, Toby Bruce, Duncan Cameron, Jeff Dangl, Savithramma Dinesh-Kumar, Robert Edwards, Sebastian Eves-van den Akker, Walter Gassmann, Jean Greenberg, Richard Harrison, Ping He, Jagger Harvey, Alisa Huffaker, Scot Hulbert, Roger Innes, Jonathan D Jones, Isgouhi Kaloshian, Sophien Kamoun, Fumiaki Katagiri, Jan E Leach, Wenbo Ma, John M McDowell, June Medford, Blake Meyers, Rebecca Nelson, Richard Peter Oliver, Yiping Qi, Diane Saunders, Michael Shaw, Prasanta Subudhi, Leslie Torrance, Brett M Tyler, John Walsh
This whitepaper reports the deliberations of a workshop focused on biotic challenges to plant health held in Washington, D.C. in September 2016. Ensuring health of food plants is critical to maintaining the quality and productivity of crops and for sustenance of the rapidly growing human population. There is a close linkage between food security and societal stability; however, global food security is threatened by the vulnerability of our agricultural systems to numerous pests, pathogens, weeds, and environmental stresses...
April 11, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28375427/plant-immunity-unravelling-the-complexity-of-plant-responses-to-biotic-stresses
#4
Robert Neil Gerard Miller, Gabriel Sergio Costa Alves, Marie-Anne Van Sluys
Background: Plants are constantly exposed to evolving pathogens and pests, with crop losses representing a considerable threat to global food security. As pathogen evolution can overcome disease resistance that is conferred by individual plant resistance genes, an enhanced understanding of the plant immune system is necessary for the long-term development of effective disease management strategies. Current research is rapidly advancing our understanding of the plant innate immune system, with this multidisciplinary subject area reflected in the content of the 18 papers in this Special Issue...
March 1, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28361244/condition-dependent-virulence-of-slow-bee-paralysis-virus-in-bombus-terrestris-are-the-impacts-of-honeybee-viruses-in-wild-pollinators-underestimated
#5
Robyn Manley, Mike Boots, Lena Wilfert
Slow bee paralysis virus (SBPV)-previously considered an obligate honeybee disease-is now known to be prevalent in bumblebee species. SBPV is highly virulent in honeybees in association with Varroa mites, but has been considered relatively benign otherwise. However, condition-dependent pathogens can appear asymptomatic under good, resource abundant conditions, and negative impacts on host fitness may only become apparent when under stressful or resource-limited conditions. We tested whether SBPV expresses condition-dependent virulence in its bumblebee host, Bombus terrestris, by orally inoculating bees with SBPV and recording longevity under satiated and starvation conditions...
March 30, 2017: Oecologia
https://www.readbyqxmd.com/read/28314795/unique-physiological-and-transcriptional-shifts-under-combinations-of-salinity-drought-and-heat
#6
Lidor Shaar-Moshe, Eduardo Blumwald, Zvi Peleg
Climate change-driven stresses such as extreme temperatures, water deficit, and ion imbalance are projected to exacerbate and jeopardize global food security. Under field conditions, these stresses usually occur simultaneously and cause damages that exceed single stresses. Here, we investigated the transcriptional patterns and morpho-physiological acclimations, of Brachypodium dystachion, to single salinity, drought and heat stresses as well as their double and triple stress combinations. Hierarchical clustering analysis of morpho-physiological acclimations showed that several traits exhibited a gradually aggravating effect as plants were exposed to combined stresses...
March 17, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28303148/differentiating-wheat-genotypes-by-bayesian-hierarchical-nonlinear-mixed-modeling-of-wheat-root-density
#7
Anton P Wasson, Grace S Chiu, Alexander B Zwart, Timothy R Binns
Ensuring future food security for a growing population while climate change and urban sprawl put pressure on agricultural land will require sustainable intensification of current farming practices. For the crop breeder this means producing higher crop yields with less resources due to greater environmental stresses. While easy gains in crop yield have been made mostly "above ground," little progress has been made "below ground"; and yet it is these root system traits that can improve productivity and resistance to drought stress...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28288794/stress-mediated-allee-effects-can-cause-the-sudden-collapse-of-honey-bee-colonies
#8
Ross D Booton, Yoh Iwasa, James A R Marshall, Dylan Z Childs
The recent rapid decline in global honey bee populations could have significant implications for ecological systems, economics and food security. No single cause of honey bee collapse has yet to be identified, although pesticides, mites and other pathogens have all been shown to have a sublethal effect. We present a model of a functioning bee hive and introduce external stress to investigate the impact on the regulatory processes of recruitment to the forager class, social inhibition and the laying rate of the queen...
March 10, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28248236/identification-of-abiotic-stress-protein-biomarkers-by-proteomic-screening-of-crop-cultivar-diversity
#9
REVIEW
Bronwyn J Barkla
Modern day agriculture practice is narrowing the genetic diversity in our food supply. This may compromise the ability to obtain high yield under extreme climactic conditions, threatening food security for a rapidly growing world population. To identify genetic diversity, tolerance mechanisms of cultivars, landraces and wild relatives of major crops can be identified and ultimately exploited for yield improvement. Quantitative proteomics allows for the identification of proteins that may contribute to tolerance mechanisms by directly comparing protein abundance under stress conditions between genotypes differing in their stress responses...
September 8, 2016: Proteomes
https://www.readbyqxmd.com/read/28211017/examining-adaptations-to-water-stress-among-farming-households-in-sri-lanka-s-dry-zone
#10
Nicholas E Williams, Amanda Carrico
Climate change is increasing water scarcity in Sri Lanka. Whether these changes will undermine national-level food security depends upon the ability of the small-scale farmers that dominate rice production and the institutions that support them to overcome the challenges presented by changing water availability. Analyzing household survey data, this research identifies household, institutional, and agroecological factors that influence how water-stressed farmers are working to adapt to changing conditions and how the strategies they employ impact rice yields...
February 16, 2017: Ambio
https://www.readbyqxmd.com/read/28167339/poverty-and-perceived-stress-evidence-from-two-unconditional-cash-transfer-programs-in-zambia
#11
Lisa Hjelm, Sudhanshu Handa, Jacobus de Hoop, Tia Palermo
INTRODUCTION: Poverty is a chronic stressor that can lead to poor physical and mental health. This study examines whether two similar government poverty alleviation programs reduced the levels of perceived stress and poverty among poor households in Zambia. METHOD: Secondary data from two cluster randomized controlled trials were used to evaluate the impacts of two unconditional cash transfer programs in Zambia. Participants were interviewed at baseline and followed over 36 months...
January 19, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28163353/can-we-be-certain-about-future-land-use-change-in-europe-a-multi-scenario-integrated-assessment-analysis
#12
I P Holman, C Brown, V Janes, D Sandars
The global land system is facing unprecedented pressures from growing human populations and climatic change. Understanding the effects these pressures may have is necessary to designing land management strategies that ensure food security, ecosystem service provision and successful climate mitigation and adaptation. However, the number of complex, interacting effects involved makes any complete understanding very difficult to achieve. Nevertheless, the recent development of integrated modelling frameworks allows for the exploration of the co-development of human and natural systems under scenarios of global change, potentially illuminating the main drivers and processes in future land system change...
February 2017: Agricultural Systems
https://www.readbyqxmd.com/read/28159664/young-adults-use-of-emotional-food-memories-to-build-resilience
#13
Elisabeth von Essen, Fredrika Mårtensson
The overall aim of this study is to specifically investigate how young adults make use of emotional-relational food memories related to "significant others" during childhood when trying to build resilience and solve developmental tasks in this period of life. A theoretical sample of three semi-structured interviews drawn from a larger sample of 30 interviews with young adults in Sweden formed the basis for analysis, guided by the steps of a phenomenologically oriented critical narrative analysis. The results illustrate three different overall directions in how the relationship to food can evolve throughout life among young adults: a relationship dominated by 1) positive emotional food memories associated with the use of food as a secure base and 2) negative emotional food memories associated with either a) being emotionally preoccupied with food or b) dismissing food...
January 31, 2017: Appetite
https://www.readbyqxmd.com/read/28117534/climate-trends-account-for-stalled-wheat-yields-in-australia-since-1990
#14
Zvi Hochman, David L Gobbett, Heidi Horan
Global food security requires that grain yields continue to increase to 2050, yet yields have stalled in many developed countries. This disturbing trend has so far been only partially explained. Here, we show that wheat yields in Australia have stalled since 1990 and investigate the extent to which climate trends account for this observation. Based on simulation of 50 sites with quality weather data, that are representative of the agro-ecological zones and of soil types in the grain zone, we show that water-limited yield potential declined by 27% over a 26 year period from 1990 to 2015...
May 2017: Global Change Biology
https://www.readbyqxmd.com/read/28081062/prevalence-of-perceived-food-and-housing-security-15-states-2013
#15
Rashid Njai, Paul Siegel, Shaoman Yin, Youlian Liao
Recent global (1) and national (2,3) health equity initiatives conclude that the elimination of health disparities requires improved understanding of social context (4,5) and ability to measure social determinants of health, including food and housing security (3). Food and housing security reflect the availability of and access to essential resources needed to lead a healthy life. The 2013 Behavioral Risk Factor Surveillance System (BRFSS) included two questions to assess perceived food and housing security in 15 states...
January 13, 2017: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/28080990/food-system-consequences-of-a-fungal-disease-epidemic-in-a-major-crop
#16
H Charles J Godfray, Daniel Mason-D'Croz, Sherman Robinson
Fungal diseases are major threats to the most important crops upon which humanity depends. Were there to be a major epidemic that severely reduced yields, its effects would spread throughout the globalized food system. To explore these ramifications, we use a partial equilibrium economic model of the global food system (IMPACT) to study a hypothetical severe but short-lived epidemic that reduces rice yields in the countries affected by 80%. We modelled a succession of epidemic scenarios of increasing severity, starting with the disease in a single country in southeast Asia and ending with the pathogen present in most of eastern Asia...
December 5, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28080987/ploidy-dynamics-and-evolvability-in-fungi
#17
REVIEW
Noa Blutraich Wertheimer, Neil Stone, Judith Berman
Rapid responses to acute stresses are essential for stress survival and are critical to the ability of fungal pathogens to adapt to new environments or hosts. The rapid emergence of drug resistance is used as a model for how fungi adapt and survive stress conditions that inhibit the growth of progenitor cells. Aneuploidy and loss of heterozygosity (LOH), which are large-scale genome shifts involving whole chromosomes or chromosome arms, occur at higher frequency than point mutations and have the potential to mediate stress survival...
December 5, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28011717/hormonal-regulation-of-reproductive-growth-under-normal-and-heat-stress-conditions-in-legume-and-other-model-crop-species
#18
REVIEW
Jocelyn A Ozga, Harleen Kaur, Raghavendra P Savada, Dennis M Reinecke
Legume crops are grown throughout the world and provide an excellent food source of digestible protein and starch, as well as dietary fibre, vitamins, minerals, and flavonoids. Fruit and seeds from legumes are also an important source of vegetables for a well-balanced diet. A trend in elevated temperature as a result of climate change increases the risk of a heat stress-induced reduction in legume crop yield. High temperatures during the crop reproductive development phase are particularly detrimental to fruit/seed production because the growth and development of the reproductive tissues are sensitive to small changes in temperature...
December 23, 2016: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28004823/paclobutrazol-induces-tolerance-in-tomato-to-deficit-irrigation-through-diversified-effects-on-plant-morphology-physiology-and-metabolism
#19
Sikander Pal, Jiangsan Zhao, Asif Khan, Narendra Singh Yadav, Albert Batushansky, Simon Barak, Boris Rewald, Aaron Fait, Naftali Lazarovitch, Shimon Rachmilevitch
Dwindling water resources combined with meeting the demands for food security require maximizing water use efficiency (WUE) both in rainfed and irrigated agriculture. In this regard, deficit irrigation (DI), defined as the administration of water below full crop-water requirements (evapotranspiration), is a valuable practice to contain irrigation water use. In this study, the mechanism of paclobutrazol (Pbz)-mediated improvement in tolerance to water deficit in tomato was thoroughly investigated. Tomato plants were subjected to normal irrigated and deficit irrigated conditions plus Pbz application (0...
December 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28003311/unlocking-the-potential-of-orphan-legumes
#20
REVIEW
Christopher Cullis, Karl J Kunert
Orphan, or underutilized, legumes are domesticated legumes with useful properties, but with less importance than major world crops due to use and supply constraints. However, they play a significant role in many developing countries, providing food security and nutrition to consumers, as well as income to resource-poor farmers. They have been largely neglected by both researchers and industry due to their limited economic importance in the global market. Orphan legumes are better adapted than the major legume crops to extreme soil and climatic conditions, with high tolerance to abiotic environmental stresses such as drought...
December 21, 2016: Journal of Experimental Botany
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