scholarly journals A robust field-based method to screen heat tolerance in wheat

2021 ◽  
Author(s):  
Najeeb Ullah ◽  
Jack Christopher ◽  
Troy FREDERIKS ◽  
Shangyu Ma ◽  
Daniel Tan ◽  
...  
Keyword(s):  
Developmental Stage ◽  
Heat Tolerance ◽  
Grain Weight ◽  
Day Length ◽  
Genotypic Differences ◽  
Developmental Phase ◽  
Wheat Genotypes ◽  
The Impact ◽  
Heat Events ◽  
Conventional Field

Wheat crops are highly sensitive to elevated temperatures, particularly during pollen meiosis and early grain filling. As the impact of heat stress greatly depends on the developmental stage of a crop, wheat germplasm ranking for heat tolerance in field experiments may be confounded by variation in developmental phase between genotypes at the time of heat events. Deploying an artificial-photoperiod-extension method (PEM) has allowed screening of diverse genotypes at matched developnemtal phases during natural heat events despite phenological varations. Irrigated experiments with 32 wheat genotypes were conducted in south-east Queensand, Australia with either (i) the PEM or (ii) conventional field plots. The Ppaired PEM and conventional field plot trials were sown at differentwith serial sowing dates from June to September.. In the PEM, plants were sown in single rows or in small plots and artificial supplemental lighting was installed at one end of each row/plot, extending day length to 20 h close to the lights. The intensity of supplementary lighting diminished as the distance from the lights increased, and induced a gradient of flowering times along each row/plot. Spikes of each genotype were tagged when they flowered. Late-sown crops received more heat shocks during early and/or mid-grainfilling than earlier sowings, and suffered significant yield losses. Significant genotypic differences in heat tolerance ranking were observed between PEM versus conventional plot screening. Individual grain weight of the tested wheat genotypes was strongy correlated in the PEM plots experiencing a similar degree of heat, but the correlation was either poor or negative in conventional plot trials. With PEM, we successfully quantified the impact post-flowering heat on individual grain weight of wheat genotypes with the heat events occurring precisely at a specific developmental stage. The PEM results produced robust field based rankings of genotypes for heat tolerance within trials experiencing similar heat events. This method promises to improve the efficiency of heat tolerance field screening, particularly when comparing genotypes of different maturity types.

The Impact of Drought Stress on some Morpho-Physiological Traits and RAPD Markers in Wheat Genotypes

2015 ◽  
Vol 4 (1) ◽  
pp. 27-37 ◽  
Author(s):  
Bayoumi Y. ◽  
Amal Abd EL-Mageed ◽  
Enas Ibrahim ◽  
Soad Mahmoud ◽  
I. El-Demardash ◽  
...  
Keyword(s):  
Drought Stress ◽  
Rapd Markers ◽  
Physiological Traits ◽  
Wheat Genotypes ◽  
The Impact

scholarly journals A meta-analysis reveals the environmental and host factors shaping the structure and function of the shrimp microbiota

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5382 ◽  
Author(s):  
Fernanda Cornejo-Granados ◽  
Luigui Gallardo-Becerra ◽  
Miriam Leonardo-Reza ◽  
Juan Pablo Ochoa-Romo ◽  
Adrian Ochoa-Leyva
Keyword(s):  
Developmental Stage ◽  
High Throughput Sequencing ◽  
Meta Analysis ◽  
Biological Factor ◽  
Rrna Gene ◽  
Wild Type ◽  
Biological Factors ◽  
Sequencing Data ◽  
Freshwater Environment ◽  
The Impact

The shrimp or prawn is the most valuable traded marine product in the world market today and its microbiota plays an essential role in its development, physiology, and health. The technological advances and dropping costs of high-throughput sequencing have increased the number of studies characterizing the shrimp microbiota. However, the application of different experimental and bioinformatics protocols makes it difficult to compare different studies to reach general conclusions about shrimp microbiota. To meet this necessity, we report the first meta-analysis of the microbiota from freshwater and marine shrimps using all publically available sequences of the 16S ribosomal gene (16S rRNA gene). We obtained data for 199 samples, in which 63.3% were from marine (Alvinocaris longirostris, Litopenaeus vannamei and Penaeus monodon), and 36.7% were from freshwater (Macrobrachium asperulum, Macrobrachium nipponense, Macrobranchium rosenbergii, Neocaridina denticulata) shrimps. Technical variations among studies, such as selected primers, hypervariable region, and sequencing platform showed a significant impact on the microbiota structure. Additionally, the ANOSIM and PERMANOVA analyses revealed that the most important biological factor in structuring the shrimp microbiota was the marine and freshwater environment (ANOSIM R = 0.54, P = 0.001; PERMANOVA pseudo-F = 21.8, P = 0.001), where freshwater showed higher bacterial diversity than marine shrimps. Then, for marine shrimps, the most relevant biological factors impacting the microbiota composition were lifestyle (ANOSIM R = 0.341, P = 0.001; PERMANOVA pseudo-F = 8.50, P = 0.0001), organ (ANOSIM R = 0.279, P = 0.001; PERMANOVA pseudo-F = 6.68, P = 0.001) and developmental stage (ANOSIM R = 0.240, P = 0.001; PERMANOVA pseudo-F = 5.05, P = 0.001). According to the lifestyle, organ, developmental stage, diet, and health status, the highest diversity were for wild-type, intestine, adult, wild-type diet, and healthy samples, respectively. Additionally, we used PICRUSt to predict the potential functions of the microbiota, and we found that the organ had more differentially enriched functions (93), followed by developmental stage (12) and lifestyle (9). Our analysis demonstrated that despite the impact of technical and bioinformatics factors, the biological factors were also statistically significant in shaping the microbiota. These results show that cross-study comparisons are a valuable resource for the improvement of the shrimp microbiota and microbiome fields. Thus, it is important that future studies make public their sequencing data, allowing other researchers to reach more powerful conclusions about the microbiota in this non-model organism. To our knowledge, this is the first meta-analysis that aims to define the shrimp microbiota.

scholarly journals Ownership structure and performance in family businesses at early developmental stage: evidence from China

2009 ◽  
Vol 7 (1) ◽  
pp. 138-150 ◽  
Author(s):  
Zhong Qin ◽  
Xin Deng
Keyword(s):  
Developmental Stage ◽  
Ownership Structure ◽  
Family Firms ◽  
Family Businesses ◽  
Early Developmental Stage ◽  
Governance Mechanism ◽  
Professional Managers ◽  
And Performance ◽  
The Impact ◽  
Early Developmental

This paper explores the impact of ownership structure on performance of family businesses at its early developmental stage in a context of under-developed market environment. Using a survey data of 296 private family firms in Ningbo, China, we find both management and single largest shareholder’s ownership is positively related to firm’s performance. However, family’s shareholding does not have significant impact on performance. Further inquiry on firm’s willingness to give shares to managers who are not family members indicates that while nearly half of the firms are willing to provide shares to professional managers, weak corporate governance mechanism and under-developed market may discourage such practice.

scholarly journals Heterosis in crosses between wheat genotypes with different spike architecture

2002 ◽  
pp. 71-75
Author(s):  
Borislav Kobiljski ◽  
Srbislav Dencic
Keyword(s):  
Yield Components ◽  
Lower Number ◽  
Grain Weight ◽  
Hybrid Vigor ◽  
Hybrid Wheat ◽  
Wheat Genotypes ◽  
Branched Spike ◽  
Spike Number ◽  
Wheat Development ◽  
The Cross

In order to estimate hybrid vigor, wheat genotypes differing in spike architecture (normal, tetrastichon and branched) were crossed and the F1 and F2 generations analyzed for the number of fertile spikelets/spike, number of grains/spike and grain weight/spike. The parents used for crossing were Sava (normal spike), Forlani (normal spike), ZG T 171/1 (tetrastichon spike) and ZG 172 (branched spike). The F1 and F2 progenies, except those from the cross Sava x Forlani, had a lower number of fertile spikelets/spike compared with the better parent. In the crosses between genotypes with normal and branched spikes, the F1 and F2 progenies formed significantly fewer grains/spike. On the other hand, the F1 of the crosses between genotypes with normal and tetrastichon spike showed a significant level of heterosis with respect to the number of grains/spike, particularly the cross Forlani x ZG T 171/1. In regard to grain weight/spike, significant heterosis was detected in all crosses except Sava x ZG 172. The crosses between genotypes with normal and tetrastichon spikes that exhibited significant heterosis for two main yield components were most promising in the context of hybrid wheat development. Such crosses deserve further attention and investigation.

scholarly journals Catheter meaning for the adolescents in dialysis.

1969 ◽  
Vol 40 (3) ◽  
pp. 316-322
Author(s):  
Liliana Cristina Morales ◽  
Edelmira Castillo
Keyword(s):  
Renal Failure ◽  
Developmental Stage ◽  
Peer Relationships ◽  
Phenomenological Study ◽  
Physical Appearance ◽  
Dialysis Catheter ◽  
Male Adolescents ◽  
Terminal Renal Failure ◽  
The Impact

Goal: Terminal renal failure affects all the person’s life dimensions. The impact of this illness during adolescence is quite dramatic because the adolescent must live with the illness demands and the demands from this crucial developmental stage. Knowledge regarding the impact of the dialysis catheter on the adolescent’s life is spare. Methodology: A phenomenological study was carried out with 8 female and male adolescents that were in dialysis. Findings: The adolescents had to learn to live with the dialysis catheter in their body. The catheter became an obstacle to achieve their identity and deteriorated their physical appearance and peer relationships.

Parenting Styles and Mental Health of Adolescents

2021 ◽  
Vol 1 (1) ◽  
pp. 41-46
Author(s):  
Vijeta Singh ◽  
Taruna Gera ◽  
Rakesh Kumar Behmani
Keyword(s):  
Mental Health ◽  
Parenting Styles ◽  
Mental Health Problems ◽  
General Health Questionnaire ◽  
Later Life ◽  
Childhood And Adolescence ◽  
Developmental Phase ◽  
Health Issues ◽  
Mental Health Issues ◽  
The Impact

Adolescence is a developmental phase marked with a heightened risk of inception of mental health disorders. The neglect in addressing mental health issues during childhood and adolescence could lead to the development of mental health problems in later life. The perspective with which children perceive their parent's parenting influences the children's mental health. Furthermore, the gender of the parent has its impacts on the shaping of a child's personality under the patriarchal society. The present research attempted to investigate the impact of different parenting styles (paternal) on adolescents' mental health. The study sample comprised 150 adolescents of 14-17 years in age from different schools located in the state of Haryana, India. Parenting Authority Questionnaire and General Health Questionnaire (GHQ-28) were used to assess parenting styles and mental health. The present study's findings suggest that adolescents with a permissive parenting style have poor mental health compared with authoritative and authoritarian parenting styles. The study recommends incorporating healthy practices in parenting styles to prevent mental health issues among adolescents.

The coat and heat retention in cattle: studies in the tropical maritime climate of Fiji

1977 ◽  
Vol 88 (1) ◽  
pp. 223-226 ◽  
Author(s):  
N. T. M. Yeates
Keyword(s):  
Heat Stress ◽  
New Zealand ◽  
Heat Tolerance ◽  
Humid Tropics ◽  
Day Length ◽  
Humid Climate ◽  
Maritime Climate

SUMMARYHeat-tolerance tests and observations on coat shedding were made on Santa Gertrudis and Hereford heifers of similar age in the warm humid climate of Fiji.Coat shedding (which is influenced by day length) was normal in the locally bred, smooth-coated Santa Gertrudis whose heat-tolerance was good. However, the Herefords, which had come from New Zealand and had very woolly coats failed to shed properly and suffered serious heat stress.Clipping and the use of a close-fitting jute rug demonstrated the specially high heatretaining properties of a thick natural coat of cattle hair; also the special need to select animals of low coat score for the very humid tropics.

Pollen, Allergens, and Human Health

2019 ◽  
Author(s):  
Rachel N. McInnes
Keyword(s):  
Management Practices ◽  
Dna Analysis ◽  
Pollen Grains ◽  
Health Impact ◽  
Meteorological Conditions ◽  
Day Length ◽  
Allergenic Pollen ◽  
Pollen Production ◽  
The Public ◽  
The Impact

Allergenic pollen is produced by the flowers of a number of trees, grasses, and weeds found throughout the world. Human exposure to such pollen grains can exacerbate pollen-related asthma and allergenic conditions such as allergic rhinitis (hay fever). While allergenic pollen comes from three main groups of plants—certain trees, grasses, and weeds—many people are sensitive to pollen from one or a few taxa only. Weather, climate, and environmental conditions have a significant impact on the levels and varieties of pollen grains present in the air. These allergenic conditions significantly reduce the quality of life of affected individuals and have been shown to have a major economic impact. Pollen production depends on both the current meteorological conditions (including day length, temperature, irradiation, precipitation, and wind speed/direction), and the water availability and other environmental and meteorological conditions experienced in the previous year. The climate affects the types of vegetation and taxa that can grow in a particular location through availability of different habitats. Land-use or land management is also crucial, and so this field of study has implications for vegetation management practices and policy. Given the influential effects of weather and climate on pollen, and the significant health impacts globally, the total effect of any future environmental and climatic changes on aeroallergen production and spread will be significant. The overall impact of climate change on pollen production and spread remains highly uncertain, and there is a need for further understanding of pollen-related health impact information. There are a number of ways air quality interacts with the impact of pollen. Further understanding of the risks of co-exposure to both pollen and air pollutants is needed to better inform public health policy. Furthermore, thunderstorms have been linked to asthma epidemics, especially during the grass pollen seasons. It is thought that allergenic pollen plays a role in this “thunderstorm asthma.” To reduce the exposure to, or impact from, pollen grains in the air, a number of adaptation and mitigation options may be adopted. Many of these would need to be done either through policy changes, or at a local or regional level, although some can be done by individuals to minimize their exposure to pollen they are sensitive to. Improved aeroallergen forecast models could be developed to provide detailed taxon-specific, localized information to the public. One challenge will be combining the many different sources of aeroallergen data that are likely to become available in future into numerical forecast systems. Examples of these potential inputs are automated observations of aeroallergens, real-time phenological observations and remote sensing of vegetation, social sensing, DNA analysis of specific aeroallergens, and data from symptom trackers or personal monitors. All of these have the potential to improve the forecasts and information available to the public.

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