Search results for "WATER STRESS"
showing 10 items of 63 documents
Comment le mode de nutrition azotée influence-t-il le prélèvement, le stockage et la remobilisation des nutriments en conditions hydriques fluctuante…
2019
National audience; Pea seeds have interesting nutritional properties through their protein, vitamin and mineral contents. However, environmental conditions such as soil water availability during plant growth influence both final yield and seed quality in pea. Soil water conditions not only modulates pea nitrogen acquisition whatever the mode of nitrogen nutrition: mineral nitrogen acquisition by roots and atmospheric di-nitrogen fixation by nodules in interaction with rhizobia, but also the overall plant mineral nutrition. The aim of this study is to get a better understanding of soil water deficit impact on nutrient acquisition, storage and distribution inside the plant according to the mo…
Studying the interplay between sulfur nutrition and water stress tolerance in pea by proteomics : a focus on seed development and composition
2019
International audience; Water stress and sulfur-deficiency are two constraints increasingly faced by crops due to climatechange and low-input practices. To investigate their interplay in the grain legume pea (Pisum sativumL.), sulfate was depleted at mid-vegetative stage and a moderate 9-day water stress period was imposedduring the early reproductive phase. The combined stress accelerated seed production, lowering yield,one-seed weight and seed number per plant, but rebalanced seed protein composition. In fact, themoderate water stress mitigated the negative effect of sulfur-deficiency on the accumulation of sulfurrichproteins in seeds, probably due to a lower seed sink strength for nitrog…
The role of sulfur nutrition in the pea response to drought
2016
International audience
Changes in the pea seed proteome in response to drought combined with sulfur deficiency
2017
EABAPGEAPSI DOCT INRA; Pea (Pisum sativum L.) produces seeds rich in proteins, but seed yield and quality remain unstable across years due to abiotic stresses occurring during the reproductive period. Drought and sulfur deficiency are two abiotic stresses that interact in the current context of climate change and lowinput practices, and recent studies suggest a role of sulfate transport and metabolism in the plant response to drought (Ernst et al., 2010; Chan et al., 2013; Gallardo et al., 2014; Ahmad et al., 2016). In this study, we investigated the impact of sulfur deficiency combined with drought on the pea seed proteome. Pea plants were subjected to sulfur-deficiency two weeks after sow…
: J. Sci. Food Agric.
2017
Background: The measurement of carbon isotopic discrimination in grape sugars at harvest (δ13 C) is an integrated assessment of water status during ripening. It is an efficient alternative to assess variability in the field and discriminate between management zones in precision viticulture, but further work is needed to completely understand the signal.; Results: This work, spanning over 3 years, performed in a hillslope toposequence in Burgundy, delineates the relationships between main soil properties (gravel amount, slope, texture) and the grapevine water status assessed by δ13 C. The highest δ13 C, indicating most severe water deficit, was recorded in gravelly soils on steep slopes. The…
Understanding of pea capacity to recover in terms of growth and nitrogen acquisition after water stress : molecular and ecophysiologic studies
2020
Pea (Pisum sativum L.) has the unique ability to fix atmospheric dinitrogen (N2) via a symbiosis with soil bacteria in root nodules. Although this specificity makes this crop particularly interesting in the context of agroecological transition, symbiotic nitrogen fixation is particularly sensitive to abiotic stresses such as water deficit, which contributes to the yield instability of this protein crop and reduces its interest for farmers. Yield stability depends both on plant's ability to tolerate stress and on its ability to recover after stress. However, the mechanisms involved during the recovery period have been for now poorly explored. It is, therefore, essential to identify traits of…
Démarches de biologie intégrative pour la compréhension des flux de carbone, azote et eau dans la plante
2021
Les démarches de biologie intégrative, qui ont constitué le fil rouge de l’ensemble de mes travaux de recherche ont été abordées au sein de deux Axes Thématiques principaux : un axe concernant la qualité des produits récoltés et un axe concernant la valorisation des interactions plante-microorganismes favorisant le prélèvement des ressources azotées en conditions hydriques fluctuantes. C’est sur ce dernier axe que je travaille depuis mon recrutement en tant que Chargée de Recherche au sein de l’UMR Agroécologie. Cette approche de biologie intégrative (multi-disciplinaire et multi-échelle) me permet de hiérarchiser les processus écophysiologiques, métaboliques et moléculaires qui pourront êt…
Growth and biomass partitioning of Arbutus unedo, Laurus nobilis, Phillyrea angustifolia and Rhamnus alaternus seedlings under water deficit
2013
Water scarcity in the Mediterranean areas is very common and the selection of drought tolerant species is a priority for landscaping purposes in the Mediterranean areas. The objective of this study was to evaluate the effect of water deficit on growth and biomass partitioning of Arbutus unedo, Laurus nobilis, Phillyrea angustifolia and Rhamnus alaternus. Seventy-two seedlings per species were grown in the greenhouse in 4-liter pots and three water regimes were imposed starting on 6 April and until 9 June, 2010. One-third of the plants was well irrigated to maintain soil water content in the 25-35% range (CTR); a second group of plants was deficit-irrigated to maintain soil water content in …
Upscaling leaf gas exchange measurements to the whole grapevine canopy: An update
2009
This review first revisits current knowledge about single-leaf function, viz. photosynthesis, chiefly in relation to environmental factors, that underscores the importance of multiple summer stresses. Emphasis is placed on the response different genotypes show under light and heat stress with or without soil-water shortage. Secondly, it tackles the thorny issue of extrapolating single-leaf readings to the whole-canopy level, with special reference to both methodological and physiological implications. Whole-canopy gas-exchange systems deliver and emphasise the usefulness of such an approach in achieving key research goals. One case in point is quantifying the amount and dynamics of canopy g…
Exogenous Growth Regulators and Water Stress Enhance Long-Term Storage Quality Characteristics of Onion
2023
Exogenous growth regulators (GRs) play a crucial role in alleviating water stress and sustaining crop yields in water-stressed areas. However, their effects on onions post-harvest quality, particularly post-monsoon onion—often preferred for long-term storage—were never studied. Therefore, this led us to investigate the interaction between water stress and GRs on the physiochemical and functional quality attributes of onions during long-term storage (9 months, at 25 ± 1 °C and 65 ± 5% RH). Onion crop was raised under four water stress levels i.e., 1.00–0.85, 0.84–0.70, 0.69–0.40, and 0.39–0.10 IW: CPE, designated as no, low, medium, and s…