Academic literature on the topic 'Groundnuts (peanuts-Arachis hypogaea)'

Peanut (Arachis hypogaea L.) is a worldwide popular oilseed. In Burkina Faso, production fluctuates from year to year. This fluctuation in yield is linked to the biotic factors which constitute the major constraints of peanuts. To this end, many breeding programs have been set up to select disease-resistant varieties to improve yields. It is with this in mind that this work focused a genetic analysis of traits related to leaf spot resistance of groundnuts. This study was to evaluate the performance of groundnut genotypes of Indian origin, through field screening to identify leafs spot resistant genotypes with good performance. The experimental device was in a completely randomized Fisher block with three repetitions. After setting up the trial, severity of the disease, percentage of defoliation and yield components were noted. Data from all observations were analyzed using the XLSTAT Pro.1 static analysis software. Statistical analysis of the obtained results showed a significant difference between the obtained values in the different genotypes evaluated for all of the above parameters except the yield. At the end of this study, nineteen (19) resistant genotypes and twenty-three (23) genotypes moderately resistant to leaf spot were identified. These resistant genotypes constitute an additional list of resistant varieties and can be used as a source of resistance in a varietal improvement program.Keywords: Performance, Arachis hypogaea L., ICRISAT collection, India.

Seven strains of symbiotic bacteria from root nodules of local races of Bambara groundnut (Vigna subterranea) and peanuts (Arachis hypogaea) grown on subsistence farmers' fields in the Kavango region, Namibia, were previously characterized and identified as a novel group within the genus Bradyrhizobium. To corroborate their taxonomic status, these strains were further characterized using a polyphasic approach. All strains possessed identical 16S rRNA gene sequences with Bradyrhizobium yuanmingense CCBAU 10071T being the most closely related type strain in the 16S rRNA gene phylogenetic analysis, and Bradyrhizobium daqingense CCBAU 15774T in the ITS sequence analysis. Phylogenetic analysis of concatenated glnII-recA-rpoB-dnaK placed the strains in a highly supported lineage distinct from named species of the genus Bradyrhizobium, most closely related to Bradyrhizobium yuanmingense CCBAU 10071T. The species status was validated by results of DNA–DNA hybridization. Phylogenetic analysis of nifH genes placed the novel strains in a group with nifH of ‘Bradyrhizobium arachidis’ CCBAU 051107 that also nodulates peanuts. The combination of phenotypic characteristics from several tests including carbon source utilization and antibiotic resistance could be used to differentiate representative strains from recognized species of the genus Bradyrhizobium. Novel strain 58 2-1T induced effective nodules on V. subterranea, Vigna unguiculata and A. hypogaea, and some strains on Lablab purpureus. Based on the data presented, we conclude that our strains represent a novel species for which the name Bradyrhizobium subterraneum sp. nov. is proposed, with 58 2-1T [ = DSM 100298T = LMG 28792T = NTCCM0016T (Windhoek)] as the type strain. The DNA G+C content of strain 58 2-1T was 64.7 mol% (T m).

Abstract Peanut (Arachis hypogaea L.), or groundnut, is an important crop economically and nutritionally in many tropical and subtropical areas of the world. It is also one of the most susceptible host crops to Aspergillus flavus resulting in aflatoxin contamination. The prevention or elimination of aflatoxin contamination in preharvest and postharvest crops is a serious challenge facing scientists. The recent International Conference on Groundnut Aflatoxin Management and Genomics held in Guangzhou, China, provided an international forum for discussions on the latest accomplishments, the development of strategies, and the initiation of cooperative research for the prevention of aflatoxin contamination. This review summarizes the progress in genetic and genomic research of peanuts and the toxin-producing fungus A. flavus. In particular, the pathway for production and the genetic regulation of afaltoxin, and the peanut-Aspergillus interaction are discussed. The use of a peanut-Aspergillus microarray will help scientists to study the crop-pathogen interaction; aids in the identification of genes involved in both fungal invasion and crop resistance, and ultimately enhance research to find solutions that prevent aflatoxin contamination in agricultural commodities.

Low oxygen or hermetic storage has been successfully used to store several commodities such as corn (Zea mays L.), cowpea (Vigna Savi), cocoa (Theobroma cocao), and coffee (Coffea L.), rice (Oryza sativa L.). However, previous research using hermetic storage for peanut or groundnut (Arachis hypogaea L.) has had mixed results. Research was conducted to determine the effect on aflatoxin contamination, seed germination, and oil chemistry of shelled peanut hermetically stored in the Purdue Improved Crop Storage (PICS) bags for up to 12 months. A 2 x 4 factorial study included 1) normal and high oleic peanut, 2) two initial moisture contents by four storage treatments. The four storage treatments were 1) burlap bags as the control, 2) PICS bags, 3) PICS bags with air extracted by vacuum, and 4) PICS bags with sachets of chlorine dioxide (ClO 2 ) dry fumigant added. There were three replications of each treatment combination. Peanut was stored in an area maintained at a temperature above 21C. The initial seed germination of the normal oleic and high oleic peanuts was 77 and 80%, respectively. Initial aflatoxin concentration in all peanut was less than 2 µg/kg . Bags were opened, sampled, and resealed at 60, 159, 249, and 301 d of storage. Approximately half of the 12 burlap bags suffered significant rodent damage, and all had significant infestation by Indian meal moth ( Plodia interpunctella ). Only 4 PICS bags had rodent damage with damage limited to the outer polypropylene bag. There were no live insects in the PICS bags. Seed germination decreased for all samples to an average of 6.3%. Peanut stored in the burlap bags had an average germination of 19.2% compared to 2.1% for peanut stored in PICS bags. The aflatoxin concentration in one of the burlap bags with normal oleic peanuts was 75 µg/kg, and one of the PICS bags with high oleic peanuts had an aflatoxin concentration of 12 µg/kg. The remaining samples had aflatoxin below the detectable limit of 2 µg/kg.

Les femmes, élément central de la vie économique et sociale, jouent un rôle important dans la société sénégalaise. Dans cette thèse nous avons voulu mettre en valeur le dynamisme et l'héroïsme quotidien des femmes sénégalaises, de la région de Diourbel en particulier. Ce dynamisme est étudié à travers leurs activités quotidiennes, la recherche d’autonomie économique, et leurs associations. Diourbel était le centre du bassin arachidier dont les contours se sont modifiés avec le développement de l’arachide et les mutations du milieu. Ces dernières ne manquent pas de conséquences sur la vie des populations, des femmes en particulier qui doivent trouver des moyens pour s'adapter et faire face au départ des hommes et à l'accroissement des charges familiales. En partant des difficultés multidimensionnelles du vieux bassin arachidier, étudiées à travers la mauvaise articulation des politiques agricoles coloniales et nationales, qui ont participé à la crise agricole qui a été aggravée par la combinaison de facteurs anthropiques et physiques, nous avons rappelé le rôle actif des femmes dans la sphère familiale, d’abord et rendu visibles les activités collectives ou individuelles qu’elles ont déployées. Ensuite, les associations féminines se caractérisent par leur diversité dans leurs formes, leurs objectifs, leurs moyens et leur tissu relationnel. Devant les mutations observées, elles sont devenues incontournables et sont perçues comme des réponses féminines. Devant tous ces changements, les femmes du Baol ont leur mot à dire et leur force à apporter pour que l'édifice familial et social reste debout. Face aux efforts déployés par les femmes, des perspectives s'ouvrent<br>Women play an important role in Senegalese society occupying a central position in the economic and social life of the nation. In this thesis we will highlight the dynamism and the heroic levels of energy that Senegalese women invest in their daily tasks. Our observations will focus on the region of Diourbel. Their dynamism will be assessed throughout their daily activities, including their efforts to reach an economic self-sufficiency and their work within organizations. Diourbel used to be the center of the groundnut (peanut) basin. The borders of this region changed with shifts in the techniques of peanut farming and modifications in the environment. The latter has had effects on the living conditions of the inhabitants, particularly on women who had to find ways to adapt to such challenges as men migrating and increases in the cost of running a household. We highlight the active role women play within the family, demonstrating their collective and individual activities. These details are presented within the context of such multidimensional issues facing the old groundnut basin, as the incoherence of the colonial and national agricultural policies which have been aggravated by the combination of anthropogenic and physical factors. In addition the women´s associations are characterized by their variety, objectives, methods and internal relationships. The analysis will show them to be an inevitable feminine response to the observed social, economic and environmental changes. Women of Baol play a substantial role and exert significant influence on the process of maintaining both the social and familiar structures of their communities. As women carry out these efforts, our analysis will reveal how these efforts generate new perspectives