Identification of Faba bean genetic loci associated with quantitative resistance to the fungus Botrytis fabae, causal agent of chocolate spot.

Introduction: Chocolate spot, caused by the ascomycete fungus Botrytis fabae, is a devastating foliar disease and a major constraint on the quality and yield of faba beans (Vicia faba). The use of fungicides is the primary strategy for controlling the disease. However, high levels of partial genetic resistance have been identified and can be exploited to mitigate the disease. Methods: The partially resistant V. faba cultivar Maris Bead and susceptible Egyptian accession ig70726 were crossed, and a genetic mapping population of 184 individuals was genotyped in the F2 generation and screened for resistance to B. fabae infection in the F3, F5, and F6 generations in a series of field experiments. A high-density linkage map of V. faba containing 3897 DArT markers spanning 1713.7 cM was constructed. Results: Multiple candidate quantitative trait loci (QTLs) in 11 separate regions of the V. faba genome were identified; some on chromosomes 2, 3, and 6 overlapped with loci previously linked to resistance to Ascochyta leaf and pod blight caused by the necrotrophic fungus Ascochyta fabae. A transcriptomics experiment was conducted at 18 h post-inoculation in seedlings of both parents of the mapping population, identifying several differentially expressed transcripts potentially involved in early stage defence against B. fabae, including cell-wall associated protein kinases, NLR genes, and genes involved in metabolism and response to reactive oxygen species. Discussion: This study identified several novel candidate QTLs in the V. faba genome that contribute to partial resistance to chocolate spot, but differences between growing seasons highlighted the importance of multi-year phenotyping experiments when searching for candidate QTLs for partial resistance.

Undertaking a research project improves confidence in research skills among student dietitians.

BACKGROUND: Research is a cornerstone of evidence-based dietetic practice. Research skills are often taught at university through experiential learning during a final-year research project. The present study aimed to investigate attitudes towards research and confidence in research skills among student dietitians before and after a research project. METHODS: A questionnaire survey of student dietitians' attitudes to research and confidence in research skills was undertaken before and after completing a research project at two universities in London, UK. Dichotomous data were compared before and after the research project using a McNemar's test. Factors associated with 'high confidence' or 'improved confidence' in overall research skills at the end of the research project were investigated using multivariable logistic regression. RESULTS: In total, 160 student dietitians completed a questionnaire before and after their research project. The majority had positive attitudes to research both before and after their research project. There was an increase in numbers with 'high confidence' in overall research skills before (13; 8.1%) and after (79; 49.4%) the research project (p < 0.001), and 113 (70.6%) reported 'improved confidence' in overall research skills. The only factor associated with 'high confidence' in overall research skills was having 'high levels of involvement in the overall research process' (odds ratio = 6.13, 95% confidence interval = 2.03-18.49, p = 0.001). CONCLUSIONS: Student dietitians have positive attitudes towards research and undertaking a research project significantly improves confidence in their research skills. A higher level of involvement in the research project is the single most significant factor associated with high confidence in research skills.

Peer-assisted learning and small-group teaching to improve practice placement quality and capacity in dietetics.

AIM: Peer-assisted learning (PAL) has been positively evaluated during practice placements for medical, nursing and some allied health professional students. The aim of this study was to evaluate a PAL and small-group teaching model of dietetic practice placement education implemented in the UK setting as part of a quality improvement process. METHODS: A PAL placement model was adapted from a previously published Australian model, implemented and evaluated among dietetic students at King's College London and with their practice educators. Process evaluation with students and practice educators from PAL practice placements at two sites and traditional 1:1 practice placements at six sites consisted of weekly questionnaires and end-of-placement focus groups with 16 students and 35 practice educators. Perceptions of the barriers, concerns and strengths of the novel model were identified. RESULTS: Implementing the PAL placement model at just two sites increased placement capacity by 12 students, a 1.3-fold increase across London. Students on PAL placements reported a good learning experience (89.3 vs 67.7%; P < 0.001) and a satisfactory workload (83.1 vs 61.3%, P = 0.005) more frequently than those on a traditional 1:1 placement. Practice educators reported significantly less time undertaking direct student supervision on PAL practice placements compared to 1:1 placements (153 minutes/week 95% confidence interval (CI) 124-183 vs 264 minutes/week 95% CI 204-324; P = 0.001). CONCLUSIONS: PAL practice placements offer potential benefits to placement capacity and possibly quality. The detailed evaluation will enable others to implement similar novel models of dietetics placements.

The role of salt intake and salt sensitivity in the management of hypertension in South Asian people with chronic kidney disease: a randomised controlled trial.

BACKGROUND: The effectiveness of salt restriction to lower blood pressure (BP) in Bangladeshi patients with chronic kidney disease (CKD) is uncertain. OBJECTIVE: To test the hypothesis that a tailored intervention intended to reduce salt intake in addition to standard care will achieve a greater reduction in BP in UK Bangladeshi patients with CKD than standard care alone. DESIGN: A randomised parallel-group controlled trial conducted over a 6 month period. SETTING: A tertiary renal unit based in acute care hospital in East London. PARTICIPANTS: 56 adult participants of Bangladeshi origin with CKD and BP >130/80 mm Hg or on antihypertensive medication. INTERVENTION: Participants were randomly allocated to receive a tailored low-salt diet or the standard low-salt advice. BP medication, physical activity and weight were monitored. MAIN OUTCOME MEASURES: The primary outcome was change in ambulatory BP. Adherence to dietary advice was assessed by measurement of 24 h urinary salt excretion. RESULTS: Of 56 participants randomised, six withdrew at the start of the study. During the study, one intervention group participant died, one control group participant moved to Bangladesh. Data were available for the primary endpoint on 48 participants. Compared with control group the intervention urinary sodium excretion fell from 260 mmol/d to 103 mmol/d (-131 to -76, p<0.001) at 6 months and resulted in mean (95% CI) falls in 24 h systolic/diastolic BP of -8 mm Hg (-11 to -5)/2 (-4 to -2) both p<0.001. CONCLUSIONS: A tailored intervention can achieve moderate salt restriction in patients with CKD, resulting in clinically meaningful falls in BP independent of hypertensive medication. TRIAL REGISTRATION: ClinicalTrials.gov NCT00702312.

Designing a national clinical audit of nutritional care in health and social care settings: consideration and future directions.

The aim of this review paper is to consider how the principles of clinical audit could be applied to the development of an audit of nutritional care in hospitals and care homes, based on criteria derived from the Essence of Care: Food and Drink. A literature review identified fifteen key papers that included guidance or standards for nutritional care in hospitals or care homes. These were used to supplement the ten factors suggested by the Essence of Care to develop a set of potential audit criteria covering all aspects of the nutritional care pathway including the identification of risk of malnutrition, implementation of nutritional care plans, referral to healthcare professionals for further nutritional assessment and nutritional support strategies. A series of audit tools have been developed, including an organisational level audit tool, a staff questionnaire, a patients' and residents' records audit tool and a patients' and residents' experiences questionnaire. Further issues to consider in designing a national nutritional audit include the potential role of direct observation of care, the use of trained auditors and the scope for including the results of pre-existing local audits. In conclusion, a national audit would need to encompass a very large number of health and care organisations of widely varying sizes and types and a diverse range of people.

Maternal plasma fatty acid composition and pregnancy outcome in adolescents.

Adolescents are at a greater risk of adverse pregnancy outcome, including spontaneous preterm delivery and fetal growth restriction, and typically have a poorer-quality diet than adults have. In the present study, we addressed the hypothesis that low maternal dietary intake of n-3 long-chain PUFA (LCP) status adversely influences pregnancy outcome. A total of 500 adolescents (14-18 years) were recruited at ≤ 20 weeks' gestation. The frequency of consumption of oily fish was determined by questionnaire (at recruitment and during the third trimester). The fatty acid composition of plasma lipids during the third trimester was determined in 283 subjects. Principal components analysis (PCA) was used to derive components, which were divided into tertiles. The pregnancy outcomes were then compared by tertile, adjusting for potentially confounding variables. Of the participants, 69% reported never eating oily fish during pregnancy, although consumption was not associated with a shorter duration of gestation (P=0·33), lower customised birth weight (P=0·82) or higher incidence of small-for-gestational age (SGA) birth (P=0·55). PCA of the fatty acid composition of maternal plasma lipids identified a 'low PUFA:SFA (P:S) ratio' component and a 'high n-3 LCP' component. There were no differences between tertiles of the 'high n-3 LCP' component and gestational age at delivery (P=0·62), customised birth weight (P=0·38) or incidence of SGA birth (P=0·25), nor were there any associations between the 'low P:S' ratio component and pregnancy outcome. Lower proportions of n-3 LCP in plasma lipids are not associated with greater risk of adverse pregnancy outcomes in UK adolescents.

Experiences of food access in hospital. A new questionnaire measure.

BACKGROUND & AIMS: People in hospital experience problems gaining access to food. We aimed to develop an experience-based measure of access to food. METHODS: The 27-item questionnaire has five domains: feeling hungry, physical barriers, organisational barriers, food choice and food quality. A survey was implemented on 29 wards in four hospitals using both self-completion and interview administration formats. RESULTS: Questionnaires were analysed for 764/1154 (66%) eligible participants. Values for Cronbach's alpha were: feeling hungry 0.886; physical barriers 0.809; organisational barriers 0.632; food choice 0.414; and food quality 0.738. The proportions of compromised patients in each domain were: hunger 30%; physical barriers 24%; organisational barriers 29%; food choice 24%; and food quality 21%. Poor self-rated health was associated with increased problems from feeling hungry (adjusted odds ratio 2.39, 95% confidence interval 1.10-5.18); older age was associated with increased difficulties with physical problems (2.67, 1.31-5.42) as were admission to a stroke ward (16.8, 5.09-55.3) or elderly care ward (3.50, 1.08-11.40). Problems with food access varied between hospitals and wards. CONCLUSIONS: We have developed a reliable and valid questionnaire measure of hospital food access. The measure reveals widespread problems of food access in hospital.

A prospective study of micronutrient status in adolescent pregnancy.

BACKGROUND: Adolescents are more likely than adults to consume energy-dense, micronutrient-poor diets and to experience adverse pregnancy outcomes. OBJECTIVES: The objectives were to assess micronutrient intake and blood biomarkers prospectively in pregnant adolescents recruited to the About Teenage Eating (ATE) Study and to determine associations with pregnancy outcome. DESIGN: Pregnant adolescents (n = 500) were recruited from 2 UK inner city populations. Dietary intake was assessed with three 24-h dietary recalls, and micronutrient status was assessed by measurement of third trimester blood biomarkers. Pregnancy outcomes included small-for-gestational age (SGA) birth and preterm delivery. RESULTS: Median iron and folate intakes were lower than UK and US recommended amounts. Folate and vitamin B-12 status were lower in smokers, despite no differences in dietary intake. Serum folate was <7.0 nmol/L in 12% of subjects, and serum total homocysteine (tHcy) was elevated (>10 micromol/L) in 20% of subjects. Fifty-two percent of the subjects had iron deficiency anemia, and 30% had serum 25-hydroxyvitamin D concentrations <25 nmol/L. The incidence of SGA birth was higher in subjects with poorer folate status (red blood cell folate, P = 0.003; serum folate, P = 0.02; tHcy, P = 0.01; simple regression) and those with low folate intakes, regardless of the inclusion (P = 0.021) or exclusion (P = 0.049) of intake from supplements (simple regression). Adjustment for confounding variables confirmed the independence of these associations. The risk of SGA birth was also higher in subjects with low food iron intake (P = 0.049), but not when intake included iron from supplements (P = 0.21). The risk of SGA birth was lower in subjects with iron deficiency anemia (P = 0.002). CONCLUSION: Poor micronutrient intake and status increase the risk of SGA births in pregnant adolescents.

Student research projects: the experiences of student dietitians, university faculty members, and collaborators.

Two universities in the United Kingdom made systematic attempts to increase the number of student dietitians' research projects that are supervised by university faculty members in conjunction with external collaborators (collaborative projects), rather than by faculty alone (faculty-only projects). A questionnaire survey was used to evaluate the experiences of student dietitians (n=110), university faculty members (n=38), and collaborators (n=31) involved in a student research project, comparing those involved in a faculty-only project with those involved in a collaborative project. Students undertaking collaborative projects reported greater involvement in most areas of the research process and greater skill development in obtaining research ethics approval (P=0.005), data collection (P=0.05), and statistical analysis (P=0.004) than students undertaking faculty-only projects. In addition, collaborative projects were more frequently considered to produce results that would change dietetics practice than faculty-only projects by both student dietitians (60% vs 30%, P=0.01) and university faculty members (62% vs 19%, P<0.001). The collaborators also considered that in the majority of instances (61%) their involvement helped them to organize their own time to do research. The type of project did not appear to influence student's expectations of future involvement in research and audit. In general, both types of projects resulted in positive experiences for student dietitians, university faculty members, and collaborators. We recommend that those involved in dietetics education, practice, and management consider the potential value of senior-level student dietitian involvement in collaborative research projects.

Determination of relative proportions of Globodera species in mixed populations of potato cyst nematodes using PCR product melting peak analysis.

Summary Using a novel approach based on melting peak analysis of PCR products, we have developed a semi-quantitative assay to measure the relative proportions of Globodera pallida and Globodera rostochiensis in a sample of potato cyst nematodes (PCN). The method depends on a competitive multiplex PCR where the products of each species can be separated by their distinct melting temperatures (T(m)). The melting curves of the products are measured by continual fluorescence monitoring in the presence of the intercalating dye SYBR Green I whilst gradually increasing the temperature. Varying the proportion of cysts of each PCN species gave rise to melting curves with different peak heights, which reflected the relative amounts of each DNA in the sample. By calculating the ratio of the melting peak heights at the Tm of each product and comparing it with standards run under the same conditions, it was possible to estimate the proportion of each product in the mixture. Sensitivity was such that 2% of G. pallida cysts in a mixture could be detected. All results predicted by the analysis were confirmed by agarose gel electrophoresis of the PCR products. The method is rapid, reproducible and following DNA extraction, up to 25 samples can be analysed in an hour.