Digest: Plant-pathogen coevolution extends to shifts in plant breeding systems

Plants and their pathogens are in a coevolutionary arms race. Some pathogens, such as anther smuts, use their host plants’ pollinators for spore dispersal. In the plant Dianthus pavonius, gynodioecy (having female and hermaphroditic plants) has evolved to reduce flowering duration and therefore limit exposure to anther smut pathogens. Bruns et al. (2018) show that this shift in breeding system has evolved as a disease escape mechanism

Digest: Plants adapt under attack: genotypic selection and phenotypic plasticity under herbivore pressure

Plant species adapt to changing environmental conditions through phenotypic plasticity and natural selection. Agrawal et al. (2018) found that dandelions responded to the presence of insect pests by producing higher levels of defensive compounds. This defensive response resulted both from phenotypic plasticity, with individual plants’ defenses triggered by insect attack, and from evolution by natural selection acting on genetic variation in the plant population

The Southern Military Tradition: Sociodemographic Factors, Cultural Legacy, and United States Army Enlistments

Throughout the history of the United States, the South has had higher levels of military service than other regions of the country. Scholars regularly refer to this phenomenon as a “Southern military tradition.” The reasons behind this overrepresentation are not completely understood. Do Southern sociodemographic characteristics make it a preferred recruiting area relative to other regions in the United States, or is there something distinctive about the cultural legacy of Southern history that encourages and supports military service? Using a unique data set that includes county- level active duty army enlistments and sociodemographic information, we show that Southern counties have significantly higher enlistment rates than counties in the Northeast and Midwest. These differences disappear when sociodemographic factors, such as fewer college graduates and a prominent presence of Evangelical Christians, are taken into account. These findings suggest that population characteristics may be a stronger driver of current regional disparities in military service than an inherited Southern military tradition

Developments in the scientific and clinical understanding of autoinflammatory disorders

The autoinflammatory diseases, also known as periodic fever syndromes, are disorders of innate immunity which can be inherited or acquired and which cause recurrent, self-limiting, seemingly spontaneous episodes of systemic inflammation and fever in the absence of autoantibody production or infection. There has been much recent progress in elucidating their aetiologies and treatment. With the exception of familial Mediterranean fever, which is common in certain populations, autoinflammatory diseases are mostly rare but should not be overlooked in the differential diagnosis of recurrent fevers since DNA diagnosis and effective therapies are available for many of them

A study of the effects of acid on the polymerisation of pyrrole, on the oxidative polymerisation of pyrrole and on polypyrrole

The polymer products arising from the hydrochloric acid treatment of aqueous pyrrole were shown to have spectroscopic data consistent with alternating pyrrole and pyrrolidine units with varying degrees of ring opening of the pyrrole units. The acid catalysed polymerisation of pyrrole offers a facile route to polymers with amine and carbonyl functional groups, which could be further derivatised. The products were polydisperse spheres; however the use of steric stabilisers induced monodisperse sphere formation and a concomitant ten fold decrease in size. Dilute nitric acid treatment of aqueous pyrrole gave polydisperse spheres (and ovoid shapes) in lower yield, plus a small proportion of curious particles which resembled pitted olives. The presence of acid in the reaction mixture of pyrrole and ferric ions was shown to have a relatively small effect on the conductivity of the resultant polypyrrole. The ability of polypyrrole to withstand harsh acidic conditions was assessed. Polypyrrole was shown to possess significant conductivity even after treatment with boiling concentrated hydrochloric acid

Development of food photographs for use with children aged 18 months to 16 years:comparison against weighed food diaries – The Young Person’s Food Atlas (UK)

Traditional dietary assessment methods, used in the UK, such as weighed food diaries impose a large participant burden, often resulting in difficulty recruiting representative samples and underreporting of energy intakes. One approach to reducing the burden placed on the participant is to use portion size assessment tools to obtain an estimate of the amount of food consumed, removing the need to weigh all foods. An age range specific food atlas was developed for use in assessing children’s dietary intakes. The foods selected and portion sizes depicted were derived from intakes recorded during the UK National Diet and Nutrition Surveys of children aged 1.5 to 16 years. Estimates of food portion sizes using the food atlas were compared against 4-day weighed intakes along with in-school / nursery observations, by the research team. Interviews were conducted with parents the day after completion of the diary, and for children aged 4 to 16 years, also with the child. Mean estimates of portion size consumed were within 7% of the weight of food recorded in the weighed food diary. The limits of agreement were wide indicating high variability of estimates at the individual level but the precision increased with increasing age. For children 11 years and over, agreement with weighed food diaries, was as good as that of their parents in terms of total weight of food consumed and of intake of energy and key nutrients. The age appropriate food photographs offer an alternative to weighed intakes for dietary assessment with children

Four dimensional Lie symmetry algebras and fourth order ordinary differential equations

Realizations of four dimensional Lie algebras as vector fields in the plane are explicitly constructed. Fourth order ordinary differential equations which admit such Lie symmetry algebras are derived. The route to their integration is described.Comment: 12 page

Constraints on the evolution of azole resistance in plant pathogenic fungi

The durability of azole fungicides in controlling agriculturally important pathogenic fungi is unique amongst modern single site fungicides. Today, azoles are still relied on to control pathogens of many crops including cereals, fruits and vegetables, canola and soybeans. Significantly, this widespread use continues despite many reports of azole-resistant fungal strains. In this review, recent reports of azole resistance and the mechanisms associated with resistant phenotypes are discussed. The example of the complex evolution of the azole target sterol 14-demethylase (CYP51) enzyme in modern European populations of the wheat pathogen Mycosphaerella graminicola is used to describe the quantitative and epistatic effects on fungicide sensitivity and enzyme function of target site mutations, and to explore the hypothesis that constraints on CYP51 evolution have ensured the longevity of azoles. In addition, the threats posed by alternative resistance mechanisms causing cross-resistance to all azoles or even unrelated fungicides are discussed, and postulations are made on how using new genomic technologies to gain a greater understanding of azole resistance evolution should enhance the ability to control azole-resistant strains of plant pathogenic fungi in the future