Thierry Tétu

Thierry Tétu
Université de Picardie Jules Verne | UPJV · EDYSAN - Ecologie et dynamique des systèmes anthropisés

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33
Publications
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Publications

Publications (33)
Article
Full-text available
Drought is one of the major abiotic stresses with a detrimental impact on plant growth and development irrespective of the developmental stage. Thus, identifying the physiological mechanisms driving drought resistance in crops remains challenging. Drought tolerance was evaluated in nine durum wheat cultivars (Triticum durum Desf.) at an early stage...
Article
Full-text available
To evaluate the combined effect of different agricultural practices on photosynthetic nitrogen and water-use efficiency, winter wheat was grown in the field under tillage and no-till conditions, with and without cover crops under low and high nitrogen fertilization inputs. Leaf physiological traits, such as the rate of photosynthesis, stomatal cond...
Article
Full-text available
Salinity is one of the most important stresses that reduces plant growth and productivity in several parts of the world. Nine Tunisian durum wheat genotypes grown under hydroponic conditions were subjected to two levels of salt stress (100 and 170 mM NaCl) for 21 days. An integrative analysis revealing the impact of salinity on key phenotypic and p...
Article
Full-text available
1.Reducing the deleterious effects of intensive tillage and fertilisation on ecosystem integrity and human health is challenging for sustainable agriculture. The use of cover crops has been advocated as a suitable technique for this purpose, but scientific evidence to support this has been scarce. 2.After four years and a complete rotation; includi...
Article
The application of nitrogen (N) and herbicides are commonly used to fertilize crops and protect them against weed development, but are also considered as soil and environment pollutants. Even so, the individual and combined non-target effects of N fertilizers and herbicides on multitrophic interactions within agrosystems are not well known. From so...
Article
Full-text available
A field study was conducted in northern France over two consecutive years to evaluate the combined effect of conventional tillage (CT) vs no till (NT) with or without cover crops (cc) and nitrogen (N) fertilization on various agronomic traits related to N use efficiency in winter wheat. Five years after conversion of CT to NT, significant increases...
Article
Nitrogen cycling in agroecosystems is heavily dependent upon arbuscular mycorrhizal fungi (AMF) present in the soil microbiome. These fungi develop obligate symbioses with various host plant species, thus increasing their ability to acquire nutrients. However, AMF are particularly sensitive to physical, chemical and biological disturbances caused b...
Thesis
Full-text available
World population growth and related food demand require an increase of agrosystems’ productivity. Soil conservation agriculture, by promoting ecological processes efficiency in agrosystems, is a sustainable practice from an environmental and economic point of view. A field experiment conducted over a 6-year period has tested individual and combined...
Article
Full-text available
The use of nitrogen (N) fertilizer and glyphosate-based herbicides is increasing worldwide, with agriculture holding the largest market share. The agronomic and socioeconomic utilities of glyphosate are well established; however, our knowledge of the potential effects of glyphosate applied in the presence or absence of long-term N fertilization on...
Data
Data matrix used for principal component analyses of Fig 3 and Fig 5. (PDF)
Poster
Full-text available
Intensive agriculture, using high inputs such as nitrogen (N) fertilizers, pesticides and soil tillage provides sufficient food production but at the expense of biodiversity and ecosystem integrity. In this context, a shift of farming paradigm is needed to meet the global food demand and the challenge of a sustainable agriculture. Earlier studies o...
Article
Full-text available
Arbuscular mycorrhizal fungi (AMF) play major roles in nutrient acquisition by crops and are key actors of agroecosystems productivity. However, agricultural practices can have deleterious effects on plant–fungi symbiosis establishment in soils, thus inhibiting its potential benefits on plant growth and development. Therefore, we have studied the i...
Poster
Full-text available
In the last few decades, classical farming practices depending on high agricultural inputs, such as nitrogen fertilizers and soil tillage have allowed sufficient food production. However, important ecological cost and a strong degradation of ecosystem services was observed in return. Therefore, environmentally-friendly farming practices, such as ec...
Poster
Full-text available
From soil samples collected in fields characterized by contrasted nitrogen management over a 6-year period, we investigated the effects of direct application of glyphosate and nitrogen fertilization on microbial activities and soil nutrient status, the bean (Phaseolus vulgaris) biomass and nutrient acquisition, and the impacts of plant nutrition on...
Article
Full-text available
A two-year experiment was conducted in the field to measure the combined impact of tilling and N fertilization on various agronomic traits related to nitrogen (N) use efficiency and to grain yield in maize cultivated in the presence of a cover crop. Four years after conversion to no-till, a significant increase in N use efficiency N harvest index,...
Data
Chronological representation of crop rotation over the 4-year experiment. (NT) no-till, (CT) conventional tillage, (N0) no fertilization, (N1) N fertilization, (Ø) no cover crops. (TIF)
Article
Full-text available
Arbuscular mycorrhizal fungi (AMF) play a major role in the uptake of nutrients by agricultural plants. Nevertheless, some agricultural practices can interrupt fungal-plant signaling and thus impede the establishment of the mycorrhizal symbiosis. A field experiment performed over a 5-year period demonstrated that both the absence of tillage and of...
Poster
Known for decades for its agronomic benefits, and widely used by farmers throughout the world, conservation agriculture struggles to be installed definitely in Europe. It was shown that tillage was responsible for the overall erosion of soil fertility. However, there is still a large debate about the real role of no-till in soil carbon sequestratio...
Article
Full-text available
In this review, we present the recent developments and future prospects of improving nitrogen use efficiency (NUE) in crops using various complementary approaches. These include conventional breeding and molecular genetics, in addition to alternative farming techniques based on no-till continuous cover cropping cultures and/or organic nitrogen (N)...
Article
In order to improve regenerative potential in Beta vulgaris L. cultural conditions were established for efficient plant regeneration from cotyledon-derived calli. Organogenic calli were initiated at frequencies of 8–59 % with six sugarbeet lines. N6-benzyl-ammopurine (1 mg/1) associated with 2,3,5 triiodobenzoic acid (0.5 mg/1) was found to be the...
Article
A rapid and efficient regeneration system via somatic embryogenesis has been developed from zygotic embryos of Hyoscyamus niger (black henbane). The effect of 2-(n-morpholino)ethanesulfonic acid (MES), myo-inositol (MI) and different combinations of them with a number of growth regulators on somatic embryogenesis was evaluated. Maximum frequency of...
Article
A simple and reproducible protocol for regeneration of sugarbeet plants from hypocotyl expiants derived from 21 day-old-seedlings has been developed. Expiants were cultured on MS medium containing 0.3 mg/l N6-Benzylaminopurine, 0.1 mg/l Naphthalene Acetic Acid, 50 mg/l adenine and 0.5% (w/v) fructose, 0.5% (w/v) sucrose and 0.5% (w/v) glucose to in...
Article
Nine cultivars of Pisum sativum L. were screened for their ability to develop somatic embryos and buds from immature zygotic embryos cultured in vitro. In certain cultivars, such as «Bonnaire» and «Davina», high frequency regeneration was achieved via direct somatic embryogenesis or organogenesis, depending on the composition of the medium. Embryog...
Chapter
Different systems of plantlet regeneration via somatic embryogenesis or organogenesis in sugarbeet (i), soybean (ii) and pea (iii) tissue cultures have been described. Organogenic sugarbeet calli were obtained preferentially from inflorescence apices with an association of zeatin and triiodobenzoïc acid. Somatic embryogenesis from calli or from pri...
Article
Detrez, C., Tetu, T., Sangwan, R. S. and Sangwan-Norreel, B. S., 1988. Direct organogenesis from petiole and thin cell layer explants in sugar beet cultured in vitro.—J. exp. Bot. 39: 917–926. Plant regeneration was obtained by direct bud formation from petiole as well as from thin cell layer explants taken from sugar beet (Beta vulgaris L.) plant...
Article
Tétu, T., Sangwan, R. S. and Sangwan-Norreel, B. S. 1987. Hormonal control of organogenesis and somatic embryogenesis in Beta vulgaris callus.—J. exp. Bot. 38: 506–517. Three main pathways of morphogenesis viz: root formation, shoot formation and somatic embryogenesis, have been observed in the callus derived from various explants of Beta vulgaris...

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Project (1)
Project
As part of an integrative scientific project, namely the VEGESOL project, we aim to assess the crop productivity within an intensive crop rotation in which cereals (maize, wheat) and industrial crops (green bean, green pea, sugar beet) are cultivated under high-, reduced- and low-external input cropping systems (the level of external inputs being defined by the fertilizer rates applied). Conducted in both conventional and no-till farming, this study will provide a better knowledge of the involvement of soil fertility in crop productivity. The ultimate goal is to promote cropping systems with low energy costs that are able to maintain economic profitability of farms: the only way to meet all the criteria of sustainable agriculture.