The identification of QTL for several physiological traits in sunflower is described. Traits related to photosynthesis (leaf chlorophyll concentration, net photosynthesis and internal CO(2) concentration) and water status (stomatal conductance, transpiration, predawn leaf water potential, and relative water content) were evaluated in a population of recombinant inbred lines under greenhouse conditions. Narrow-sense heritabilities were low to average. Using an AFLP linkage map, 19 QTL were detected explaining 8.8-62.9% of the phenotypic variance for each trait. Among these, two major QTL for net photosynthesis were identified on linkage group IX. One QTL co-location was found on linkage group VIII for stomatal movements and water status. Coincident locations for QTL regulating photosynthesis, transpiration and leaf water potential were described on linkage group XIV. These results lead to the first description of the organization of genomic regions related to yield in sunflower.
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http://dx.doi.org/10.1093/jexbot/52.362.1857 | DOI Listing |
Alzheimers Dement
December 2024
Department of Neurology, Vanderbilt University Medical Center, Nashville, TN, USA.
Background: Recent research emphasizes the significance of white matter tracts and the free-water (FW) component in understanding cognitive decline. The goal of this study is to conduct a large-scale assessment on the role of white matter microstructure on longitudinal cognitive decline.
Method: This study used a cohort collated from seven longitudinal cohorts of aging (ADNI, BIOCARD, BLSA, NACC, ROS/MAP/MARS, VMAP, and WRAP).
Background: Hispanic/Latino communities in the US are rapidly growing and aging and are at two-fold risk of Alzheimer's Disease and Related Dementia's (ADRD) compared to non-Hispanic Whites. This additional risk could be, in part, due to increased risk of cardiovascular disease. Hispanics/Latinos also have higher rate of diabetes compared to non-Hispanic Whites and nearly 2 out of 5 individuals with diabetes go undiagnosed.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Wake Forest University School of Medicine, Winston-Salem, NC, USA.
Background: Little is known about how plasma Alzheimer's disease (AD) biomarkers relate to neuroimaging biomarkers of cerebral small vessel disease (cSVD) in the context of neurodegeneration and AD pathology in late life.
Method: This cross-sectional study included 251 Multi-Ethnic Study of Atherosclerosis (MESA) Exam 6 participants with plasma AD biomarkers (Aβ42/Aβ40, GFAP, NfL, p-tau181, p-tau217, p-tau231; Quanterix SIMOA), MRI (neurodegeneration and cSVD), PiB (amyloid) PET, and UDSv3-based adjudicated cognitive status (69% cognitively normal, 27% MCI, 4% probable dementia) data at the Wake Forest site. Multivariable models examined relationships among cognitive status, plasma, and neuroimaging biomarkers (covariates: age, education, race, gender, smoking status, kidney function [eGFR], APOE-ε4, BMI; significance at p<.
Alzheimers Dement
December 2024
Institute of Psychiatry, Psychology and Neuroscience, Maurice Wohl Clinical Neuroscience Institute, King's College London, London, UK.
Background: Alzheimer's disease (AD) is a devastating disease at an individual level and for the wider society. Despite huge research efforts the underlaying causes of AD is still not well understood. We know that lipid metabolism is fundamental for maintaining a heathy brain and that some of the strongest risk factors for AD, such as APOE4, affect lipids.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Centre for Studies on Prevention of Alzheimer's disease (StoP-AD Centre), Douglas Mental Health Institute, Montreal, QC, Canada.
Background: The heterogeneous etiology of "sporadic" Alzheimer's disease (sAD) includes genetic influences. To better understand synaptic dysfunction in AD pathogenesis, we used protein quantitative train loci (pQTL) assessments and a polygenic risk score (PRS) to examine the relationship between synaptic integrity and longitudinal cognitive performance in the presymptomatic phase of the disease.
Method: The PREVENT-AD cohort includes symptom-free elderly participants at risk of AD because of their family history.
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