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Background Health workers play a critical role in providing gender-sensitive HIV care. However, without adequate training, they may inadvertently reinforce negative gender norms that hinder engagement in care. To improve ART services in sub-Saharan Africa, effective implementation strategies, including trainings, are essential. Methods This study evaluated the feasibility and acceptability of a novel 4-session, gender-sensitivity training for HIV health and lay workers in rural and peri-urban Uganda. We conducted a pilot quasi-experimental controlled trial in 2022–23, utilizing data from three sources: process data from 144 providers and 238 clients, qualitative post-intervention focus groups and interviews with 53 training attendees, and stakeholder interviews with 12 community leaders and facilitators. We employed thematic analysis guided by the Consolidated Framework for Implementation Research (CFIR). Results The training was highly rated by attendees via brief post-session surveys, with 99% of sessions deemed satisfactory. Qualitative feedback indicated that the sessions were perceived as appropriate for addressing providers’ gaps in delivering gender-sensitive care and as beneficial for participants. High feasibility was evidenced by 100% of intervention steps delivered (fidelity checklists), 86% attendance (attendance logs), and 98.6% and 94.8% recruitment of eligible providers and clients (study records), respectively. Through qualitative exit focus groups, factors that positively affected acceptability and feasibility included tactics to gain support from supervisors, the use of experienced facilitators and active learning approaches, and the consideration of the health system context in delivery (e.g., cadre mix, location). Suggested improvements encompassed addressing interpersonal and structural barriers to client-centered care, incorporating community sensitization, streamlining content, and enhancing mentorship follow-ups. Stakeholders recognized the training’s alignment with national health priorities and emphasized the need for clarity regarding its integration with existing training curricula and ongoing stakeholder engagement. Conclusions This study underscores the acceptability and feasibility of a gender-sensitivity training program for HIV providers; further evaluation of the program is warranted. Identified factors influencing implementation can inform enhancements to gender-focused training initiatives to improve the quality of HIV services and enhance client engagement and health outcomes. Trial registration Clinicaltrials.gov, NCT05178979, registered: November 15, 2021.

The Coast Range ophiolite (CRO) of California is one of the most extensive tracts of oceanic crust preserved in the North American Cordillera, but its origin has long remained controversial. We present here new data on mineral compositions in mantle peridotites that underlie crustal sections of the ophiolite, and show that these are dominantly refractory harzburgites related to high apparent melting in a supra-subduction zone (SSZ) setting. Abyssal peridotite (characterized by high-Al spinels and relatively high Ti, Na, Nd, Sm, Lu, and Hf in pyroxene) occurs at one location where it is associated with SSZ mantle peridotite and volcanic rocks with both oceanic and arc-like geochemistry. SSZ mantle peridotites (characterized by intermediate-Cr/Al or high-Cr spinels, and by extremely low Ti, Na, Nd, Sm, Lu, and Hf in pyroxenes) are associated with crustal sections containing arc-related volcanic rocks, including boninites. This convergence between conclusions based on crustal lithologies and their underlying mantle sections confirms previous proposals that link the CRO to SSZ processes, and seriously undermines hypotheses that invoke formation of the ophiolite at a mid-ocean ridge spreading center.

Cassava ( Manihot esculenta Crunz) is a staple food crop for millions of people in Africa. The crop’s tolerance to drought, ability to survive in marginal soils and amenability to a variety of uses endears it to farmers. However, utilization of the crop’s full potential for food security is limited by the presence of cyanogenic glucosides (HCN) in the roots. These not only make cassava bitter to the taste but can also be toxic to lethal levels. Breeding for low HCN cassava is necessary to mitigate against high dietary HCN consumption. However, efforts at variety development have been slow, in part due to limited use of molecular tools. This study assessed genomic prediction accuracy for fresh cassava root HCN content using the GBLUP model and compared its performance to 5 Bayesian models (Bayes A, Bayes B, Bayes C, Bayesian Ridge Regression (BRR), Bayesian Lasso (BL) and the Reproducing Kernel Hilbert Spaces (RKHS) model. We used a genomic selection (GS) cycle two population consisting of 434 clones which were genotyped with 24,040 SNP markers using the DArTseq platform. Data were filtered to remove markers with minor allele frequency (MAF) less than 0.05, call rate less than 80%, clones with more than 20% missing calls and clones with no matching phenotypic data. Phenotypic data on fresh cassava root HCN content was collected on roots at 12 months after planting. The accuracy of GBLUP model was low, ranging from -0.41 to 0.68 and averaging 0.22 across folds. On the other hand, the accuracy of RKHS and Bayesian models was moderate, with BL and RKHS being most accurate ( r =  0.52), followed by Bayes A ( r =  0.49) and Bayes B and Bayes C ( r =  0.48). The BRR model was least accurate ( r =  0.18). Collectively, these results provide a foundation for implementing GS to accelerate efforts to deliver desired genetic gains for low HCN cassava in farmers’ fields.

Background Cassava ( Manihot esculenta Crantz) is staple food and major source of calories for over 500 million people in sub-Saharan Africa. The crop is also a source of income for smallholder farmers, and has increasing potential for industrial utilization. However, breeding efforts to match the increasing demand of cassava are impeded by its inability to flower, delayed or unsynchronized flowering, low proportion of female flowers and high fruit abortions. To overcome these sexual reproductive bottlenecks, this study investigated the effectiveness of using red lights to extend the photoperiod (RLE), as a gateway to enhancing flowering and fruit set under field conditions. Materials and methods Panels of cassava genotypes, with non- or late and early flowering response, 10 in each case, were subjected to RLE from dusk to dawn. RLE was further evaluated at low (LL), medium (ML) and high (HL) red light intensities, at ~  ≤ 0.5; 1.0 and 1.5PFD (Photon Flux Density) in µmol m −2  s −1 respectively. Additionally, the effect of a cytokinin and anti-ethylene as plant growth regulators (PGR) and pruning under RLE treatment were examined. Results RLE stimulated earlier flower initiation in all genotypes, by up to 2 months in the late-flowering genotypes. Height and number of nodes at first branching, particularly in the late-flowering genotypes were also reduced, by over 50%. Number and proportion of pistillate flowers more than doubled, while number of fruits and seeds also increased. Number of branching levels during the crop season also increased by about three. Earlier flowering in many genotypes was most elicited at LL to ML intensities. Additive effects on flower numbers were detected between RLE, PGR and pruning applications. PGR and pruning treatments further increased number and proportion of pistillate flowers and fruits. Plants subjected to PGR and pruning, developed bisexual flowers and exhibited feminization of staminate flowers. Pruning at first branching resulted in higher pistillate flower induction than at second branching. Conclusions These results indicate that RLE improves flowering in cassava, and its effectiveness is enhanced when PGR and pruning are applied. Thus, deployment of these technologies in breeding programs could significantly enhance cassava hybridizations and thus cassava breeding efficiency and impact.

Acute and chronic gamma irradiations (ACGIs) has facilitated generation of new varieties that can withstand abiotic and biotic stresses. This study examined the impact of ACGI doses on the regenerative ability of in vitro embryogenic tissues into complete plants. Tissues from nine genotypes (Alado, NASE 13, NASE 19, NAROCASS 1, CV_193, CV_98/0505, CV_60444, BAO, and reference Ubi Putih) were subjected to acute gamma irradiation (AGI) across six dose levels (0, 5, 10, 15, 20, 25, 35 Gy). Five genotypes (Ubi Putih, CV_60444, Alado, NASE 13, NAROCASS 1) were exposed to chronic gamma irradiation (CGI) for one to four weeks. Ten explants per genotype per dose were evaluated. Mean shoot length was used to calculate the growth reduction dose (GR50), and cell structure changes were analyzed using hematoxylin and eosin staining. Exposure of tissues to AGI and CGI enhanced shoots, roots, leaf regeneration as well as shoot length at dose rates of 5-20 Gy (AGI) and 46 Gy (CGI) at twoweeks. The calculated GR50 varied across genotypes and irradiation types. Histological analysis confirmed that distinct structural changes in cell and tissue morphology were linked to irradiation exposure. These results demonstrate that ACGIs can induce accelerated regeneration and structural variation in embryogenic cassava tissues, revealing the potential to develop novel varieties with improved stress resilience. The study underscores ACGIs as a viable biotechnological tool in mutation breeding and genetic improvement of root crops.

Viruses infecting wild flora may have a significant negative impact on nearby crops, and vice-versa. Only limited information is available on wild species able to host economically important viruses that infect sweetpotatoes (Ipomoea batatas). In this study, Sweet potato chlorotic fleck virus (SPCFV; Carlavirus, Betaflexiviridae) and Sweet potato chlorotic stunt virus (SPCSV; Crinivirus, Closteroviridae) were surveyed in wild plants of family Convolvulaceae (genera Astripomoea, Ipomoea, Hewittia and Lepistemon) in Uganda. Plants belonging to 26 wild species, including annuals, biannuals and perennials from four agro-ecological zones, were observed for virus-like symptoms in 2004 and 2007 and sampled for virus testing. SPCFV was detected in 84 (2.9%) of 2864 plants tested from 17 species. SPCSV was detected in 66 (5.4%) of the 1224 plants from 12 species sampled in 2007. Some SPCSV-infected plants were also infected with Sweet potato feathery mottle virus (SPFMV; Potyvirus, Potyviridae; 1.3%), Sweet potato mild mottle virus (SPMMV; Ipomovirus, Potyviridae; 0.5%) or both (0.4%), but none of these three viruses were detected in SPCFV-infected plants. Co-infection of SPFMV with SPMMV was detected in 1.2% of plants sampled. Virus-like symptoms were observed in 367 wild plants (12.8%), of which 42 plants (11.4%) were negative for the viruses tested. Almost all (92.4%) the 419 sweetpotato plants sampled from fields close to the tested wild plants displayed virus-like symptoms, and 87.1% were infected with one or more of the four viruses. Phylogenetic and evolutionary analyses of the 3'-proximal genomic region of SPCFV, including the silencing suppressor (NaBP)- and coat protein (CP)-coding regions implicated strong purifying selection on the CP and NaBP, and that the SPCFV strains from East Africa are distinguishable from those from other continents. However, the strains from wild species and sweetpotato were indistinguishable, suggesting reciprocal movement of SPCFV between wild and cultivated Convolvulaceae plants in the field.

We report platinum-group element (PGE) and Re concentrations, and Re-Os isotopic data for peridotites and podiform chromitite from the mid-Jurassic Coast Range ophiolite (CRO), California. Our aim is to provide insights into the formation and evolution of the CRO in a fore-arc tectonic setting. The CRO peridotites are divided into two groups: abyssal and supra-subduction zone (SSZ). They have Ir-group PGE concentrations similar to estimates for the primitive mantle and nearly chondritic relative abundances [(Os/Ir)N ≈ 1.1]. Abyssal-type peridotites have slightly subchondritic Pd-group PGE (PPGE)-Re abundances and flat chondrite-normalized patterns, whereas the SSZ-type ones are depleted overall with highly fractionated PPGE-Re patterns. The CRO peridotites have 187Os/188Os values of 0.1188 to 0.1315 (γOs = -8.3 to 1.4) and 187Re/188Os ranging from 0.022 to 0.413. The oxygen fugacity based on the V/Yb ratios of the CRO peridotites is equivalent to the fayalite-magnetite-quartz buffer. The abyssal-type peridotites are residues after ≤5% melting of the primitive upper mantle and represent a remnant of oceanic lithosphere trapped in an SSZ setting but before it was re-melted or modified by subduction processes. The abyssal-type peridotites yield an aluminachron model age of ∼1.5 Ga, implying that the CRO mantle had experienced episode(s) of melt extraction before the CRO crust was formed. The SSZ-type peridotites are refractory residues after ∼5% to 15% melting. Extraction of fore-arc basalts generated mainly by decompression melting resulted in the SSZ-type peridotites. The chromitite has 187Os/188Os value of 0.1250 (γOs = -3.5) and PGE-Re patterns complementary to that of boninite, indicating a genetic link to fore-arc magmatism.

Men’s engagement in the HIV care continuum may be negatively affected by adherence to inequitable gender norms, which may be exacerbated by HIV stigma. This cross-sectional study with 300 male fisherfolk in Uganda examined the independent and interacting effects of inequitable gender norm endorsement and HIV stigma on men’s missed HIV care appointments and missed antiretroviral (ARV) doses. Greater gender inequitable norm endorsement was associated with increased odds of missed HIV clinic visits (adjusted odds ratio [AOR)] 1.44, 95% CI 1.16–1.78) and a statistically significant interaction between internalized HIV stigma and inequitable gender norms on missed ARV doses was identified (AOR 5.32, 95% CI 2.60–10.86). Adherence to traditional gender norms reduces men’s HIV appointment attendance, and among men with high internalized stigma, increases the likelihood of poor treatment adherence. These findings point to the need for HIV interventions that reconfigure harmful gender norms with a focus on stigma reduction.

Banana Xanthomonas wilt (BXW), caused by Xanthomonas campestris pv. musacearum, is one of the most important diseases of banana (Musa sp.) and currently considered as the biggest threat to banana production in Great Lakes region of East and Central Africa. The pathogen is highly contagious and its spread has endangered the livelihood of millions of farmers who rely on banana for food and income. The development of disease resistant banana cultivars remains a high priority since farmers are reluctant to employ labor-intensive disease control measures and there is no host plant resistance among banana cultivars. In this study, we demonstrate that BXW can be efficiently controlled using transgenic technology. Transgenic bananas expressing the plant ferredoxin-like protein (Pflp) gene under the regulation of the constitutive CaMV35S promoter were generated using embryogenic cell suspensions of banana. These transgenic lines were characterized by molecular analysis. After challenge with X. campestris pv. musacearum transgenic lines showed high resistance. About 67% of transgenic lines evaluated were completely resistant to BXW. These transgenic lines did not show any disease symptoms after artificial inoculation of in vitro plants under laboratory conditions as well as potted plants in the screen-house, whereas non-transgenic control plants showed severe symptoms resulting in complete wilting. This study confirms that expression of the Pflp gene in banana results in enhanced resistance to BXW. This transgenic technology can provide a timely solution to the BXW pandemic.

Most banana improvement programs are restricted to using a sub-set of edible landraces for sexual hybridization as the majority are female sterile. This results from an array of factors that work in tandem and lead to sterility. Use of pollen germination media (PGM) during pollination significantly increases seed set, but it is a very small fraction compared to the potential seed set. This research therefore explored early pollination (a day before anthesis), evening pollination, saline treatment, plant growth regulators (PGRs) treatment, and ovule culture as potential techniques for overcoming sterility in bananas. Early and evening pollinations did not increase seed set because of immature flowers and a mismatch of male and female flower opening, respectively (t-prob. = 0.735 and 0.884). Immersion of bunches in a saline solution before pollination and ovule culture also did not overcome pollination barriers. Auxin antagonists (TIBA and salicylic acid) increased seed set, though their respective increases were not statistically significant (t-prob. = 0.123 and 0.164, respectively). The use of auxin antagonists shows great potential for overcoming pollination barriers in bananas. However, application rates and time of application have to be optimized and used holistically with other promising techniques, such as use of PGM.