Denis Cornet

Denis Cornet
Cirad - La recherche agronomique pour le développement | CIRAD · Unité Mixte de Recherche Amélioration Génétique et Adaptation des Plantes Méditerranéennes et Tropicales (AGAP)

PhD

About

48
Publications
30,181
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
338
Citations
Introduction
Denis Cornet currently works at the joint research unit Genetic Improvement and Adaptation of Mediterranean and Tropical Plants (UMR-AGAP) run by the the Centre for International Cooperation in Agricultural Research for Development (CIRAD), the National Institute for Agricultural Research (INRA) and Montpellier SupAgro. Denis does research in Agronomy, Crop physiology, Biostatistic and Agricultural Plant Science.
Additional affiliations
August 2018 - present
Cirad - La recherche agronomique pour le développement
Position
  • Crop physiologist
October 2010 - present
Université des Antilles
Position
  • Vacataire d'enseignement
Description
  • Ecophysiologie végétale
October 2010 - present
Université des Antilles
Position
  • Vacataire d'enseignement
Description
  • Evaluation de la durabilité

Publications

Publications (48)
Article
Yams (Dioscorea spp.) are important species, especially for resource-poor farmers of West Africa, where crop yields are affected by early plant size hierarchy linked with uneven emergence. Although the causes of this phenomenon are not fully known, yams, like other vegetatively propagated crops, have heavy planting material that is liable to induce...
Article
Yam crops (Dioscorea spp.) present a very high and unexplained interplant variability which hinders attempts at intensification. This paper aims to characterize the plant-to-plant variability in yield and to identify its underlying causes for the two major yam species (Dioscorea alata and Dioscorea rotundata). Four field experiments were carried ou...
Article
Full-text available
Yams are neglected crops, mostly grown in West Africa by resource-poor farmers. Little is known about the physiology of the crop and researchers lack practical and efficient tools to conduct growth analysis. The objective of this study was to develop allometric models able to predict yam leaf area and leaf and stem dry mass with acceptable accuracy...
Article
Tubers of water yam (Dioscorea alata L.) are an important source of carbohydrates for millions of people throughout the tropics. Planting of the crop in the Caribbean and Central America is usually carried out between March and July. As water yam is very sensitive to small variations in photoperiod, changes in the planting date may greatly affect c...
Article
Age of plant and environmental conditions during growing may affect texture (friability) and taste of boiled cassava roots. We investigated the quality of boiled roots of seven cultivars harvested at 10, 12 and 14 months in three different seasons. Sensory taste (sweet or bitter) of boiled cassava root could not be correlated with sugar content an...
Article
Yam (Dioscorea spp.) is an important source of food for millions of people throughout the tropics. Yam yields are constrained by several factors such as low soil fertility and a poor response of the crop to nutrient supply. Here we present an experimental and modeling study performed to test the hypothesis that N leaching in the humid tropics is a...
Article
Full-text available
The trait-based approach in plant ecology aims at understanding and classifying the diversity of ecological strategies by comparing plant morphology and physiology across organisms. The major drawback of the approach is that the time and financial cost of measuring the traits on many individuals and environments can be prohibitive. We show that com...
Article
Full-text available
Background and aims: Determining within-species large-scale variation in phenotypic traits is central to elucidate the drivers of species' ranges. Intraspecific comparisons offer the opportunity to understand how trade-offs and biogeographical history constrain adaptation to contrasted environmental conditions. Here we test whether functional trai...
Preprint
Full-text available
Background and Aims Determining within-species large-scale variation in phenotypic traits is central to elucidate the drivers of species’ ranges. Intraspecific comparisons offer the opportunity to understand how trade-offs and biogeographical history constrain adaptation to contrasted environmental conditions. Here we test whether functional traits...
Article
Despite the importance of yam ( Dioscorea spp.) tuber quality traits, and more precisely texture attributes, high-throughput screening methods for varietal selection are still lacking. This study sets out to define the profile of good quality pounded yam and provide screening tools based on predictive models using near infrared reflectance spectros...
Article
Full-text available
Background Greater yam ( Dioscorea alata L.) is a major tropical and subtropical staple crop cultivated for its starchy tubers. Breeding of this dioecious species is hampered by its erratic flowering, yet little is currently known on the genetic determinism of its sexual reproduction. Result Here we used a genome-wide association approach and iden...
Article
Full-text available
Plants were sampled from four different types of chlordecone-contaminated land in Guadeloupe (West Indies). The objective was to investigate the importance of biological and agri-environmental parameters in the ability of plants to bioaccumulate chlordecone. Among the plant traits studied, only the growth habit significantly affected chlordecone tr...
Article
Full-text available
The review aimed to identify the different High Throughput phenotyping (HTP) techniques that used for quality evaluation in cassava and yam breeding programs, and this has provided insights towards the development of metrics and their application in cassava and yam improvements. A systematic review of the published research articles involved the us...
Article
New farming technologies such as improved fallow of herbaceous legumes have been developed over the last 20 years as alternatives to traditional yam cropping systems in areas where shifting cultivation is no more possible. One aim of this research was to analyze actual adoption by smallholders of such a technology and influencing factors in the Sou...
Article
Full-text available
Loss of varietal diversity is a worldwide challenge to crop species at risk for genetic erosion, while the loss of biological resources may hinder future breeding objectives. Loss of varieties has been mostly investigated in traditional agricultural systems where variety numbers are dramatically high, or for most economically important crop species...
Article
Full-text available
Previous studies indicated that the quality of tropical composts is poorer than that of composts produced in temperate regions. The aim of this study was to test the type of manure, the use of co-composting with green waste, and the stabilization method for their ability to improve compost quality in the tropics. We produced 68 composts and vermico...
Data
Manuscript Database. Physical, chemical and biochemical compost raw data which were analyzed for the current manuscript, are available and arranged by phases (initial and end of thermophilic and stabilization phases). (XLS)
Article
Pourquoi certaines personnes conservent leur bien-être au travail et d’autres pas ? Bien souvent, nous pensons à une question de capacité d’adaptation, c’est-à-dire une compétence interne au travailleur, comme par exemple de posséder de hautes ou faibles compétences politiques. Or, une des origines possibles de la problématique se situe dans le con...
Article
Full-text available
In West and Central Africa and in the Caribbean, yam is one of the most important sources of carbohydrates and has a great potential to improve food security. The yam production sector is, however, now challenged by the satisfaction of evolving consumers’ preferences. Since little is known about consumers’ preferences regarding yams’ characteristic...
Article
Full-text available
Traditional yam-based cropping systems (shifting cultivation, slash-and-burn, and short fallow) often result in deforestation and soil nutrient depletion. The objective of this study was to determine the impact of yam-based systems with herbaceous legumes on dry matter (DM) production (tubers, shoots), nutrients removed and recycled, and the soil f...
Thesis
En Afrique de l’Ouest, l’igname est traditionnellement une culture itinérante, installée après défriche-brûlis d’une jachère longue. L’état actuel des connaissances sur le fonctionnement de la culture est insuffisant pour permettre d’élaborer des alternatives durables à ce mode de conduite pénalisant pour l’environnement. Des études récentes montre...
Conference Paper
Full-text available
Paper mulch has demonstrated its effectiveness for weed control while at least maintaining the same yield as in traditional cropping systems. In contrast plastic mulch treatment showed lower emergence rate and yield. Thanks to this labor saving technic of weeds control, paper mulch reveals itself more profitable. Since 2013, paper mulch based cropp...
Article
Full-text available
West Africa has major problems relating to the impact of slash-and-burn shifting cultivation on soil systems. In order to design more sustainable yam cropping systems, agronomy research in Benin has implemented trials in partnership with smallholders on alternative yam-based systems using shrubby (Gliricidia sepium) and herbaceous (Aeschynomene his...
Article
Full-text available
Soil fertility restoration and crop performance in many developing countries with low input agriculture strongly relies on fallow duration and management. More precise information about the availability of fallow land may provide a way to improve the simulation of yam (Dioscorea spp.) yields at the regional scale which has hardly been considered in...
Poster
Full-text available
Cette étude a permis de valider une méthode originale d’observation in situ du système racinaire de l’igname. Les résultats obtenus permettent de caractériser l’architecture et la dynamique de croissance de deux espèces d’igname alimentaire. Outre le caractère superficiel du système racinaire, nous avons mis en évidence une différence de comporteme...
Article
UMR 1334 AGAP : Equipe AFEF ‘Architecture et Fonctionnement des Espèces fruitières’ ; Team AFFS ‘Architecture and Functioning of Fruit Species’ Contact: francois.bussiere@antilles.inra.fr
Article
In the traditional yam agricultural system, by way of an ennoblement practice, farmers select tubers from the wild for cultivation. In order to assess the impact of that practice on the genetic diversity of yam, we studied the genetic structure of yams obtained after at least 3 years of ennoblement, to which farmers gave the name of traditional var...
Article
Full-text available
The project Poverty Alleviation and Enhanced Food Availability in West Africa through Improved Yam Technologies proposed to improve yam production in five West African countries (Nigeria, Bénin, Togo, Ghana, Côte d’Ivoire) during the period from 2000 to 2003. A recognized need for productive, stable yam-based systems is the maintenance of soil fert...
Article
Full-text available
L’estimation des rayonnements solaires interceptés par une culture est une donnée devenue courante en agronomie pour évaluer sa production. Cette estimation est le plus souvent faite à partir de la seule mesure de l’indice foliaire LAI et l’utilisation d’un coefficient d’extinction des rayonnements K. Ce coefficient K est souvent évalué à partir de...
Article
Full-text available
A total of 23 genotypes belonging to seven tropical food yams and two wild relative species of different origin and coming from two sampling ecological zones (the Republic of Benin in Africa and Guadeloupe in the Caribbean) was analysed for their 13C content. The δ13C values for all yam samples (from −25.39 and −30.07 ‰) indicated that all species...
Conference Paper
Full-text available
diteurs scientifiques), 2006. Partenaires pour construire des projets de sélection participative. Actes de l'atelier recherche, 14-18 mars 2005, Cotonou, Bénin. Prise en compte des savoirs locaux sur la domestication pour l'étude de la diversité génétique et la phylogénie des ignames Résumé — Prise en compte des savoirs locaux sur la domestication...
Conference Paper
Full-text available
Mechanically sliced chips produced a very dark product (flour and dough) not fully appreciated by all consumers. It seems that the blanching method used in this experiment for slices (soaking at between 60°C to 47°C) was not hot enough to control browning processes in the same way as the traditional method (stable temperature 70°C for 30 min). Furt...
Article
Full-text available
Produire durablement en milieu tropical humide impose de nombreux challenges à l'agriculture : il faut atténuer les contraintes liées aux sols et au climat, lutter contre la pression de maladies et ravageurs, répondre aux besoins nutritionnels des plantes tout en économisant les ressources du milieu et en limitant les intrants onéreux, le plus souv...
Conference Paper
Full-text available
Yam is a demanding crop in terms of organic matter and soil fertility, especially the most appreciated and market-valued cultivars (early maturing Dioscorea rotundata) used to prepare the popular dish futu (pounded yam). Traditionally cultivated in slash and burn cropping systems after a long fallow period in West Africa, yam cultivation is now con...
Conference Paper
Full-text available
Yam is a demanding crop in terms of organic matter and soil fertility, especially the most appreciated and market-valued cultivars (early maturing Dioscorea rotundata) used to prepare the popular dish futu (pounded yam). Traditionally cultivated in slash and burn cropping systems after a long fallow period in West Africa, yam cultivation is now con...
Conference Paper
Full-text available
In West Africa, yam (D. cayenensis-D.rotundata) plays an important role in food security and income generation for many small farmers. Sub-Saharan Africa contributes for more than 95% to yam’s world production. However, in West Africa yam production, traditionally based on slash and burn practice, is jeopardised by a decrease in the availability of...
Conference Paper
Full-text available
Yam is a very demanding plant in term of soil fertility. Nevertheless in spite of the very large acceptance of this affirmation, little information is available on the real nutriments requirements of yam and how to satisfy them. For instance, numerous mineral fertilization recommendations are provided and the recommended doses are more often import...

Network

Cited By

Projects

Projects (3)
Archived project
Research the main yam-based farming systems and their dynamics in the Central part of Benin