The diversity of drought adaptation in the wide

Monneveux, P.; Belhassen, E.

doi:10.1007/978-94-017-1299-6_2

Cited by 35 publications

(25 citation statements)

References 24 publications

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“…The advantage of a greenhouse experiment over field experiments is that relative humidity, wind speed and temperature are more easily controlled and can be artificially set and maintained (Monneveux and Belhassen, 1996), making crop evapotranspiration easy to estimate by pan evaporation. An experiment was established in the research greenhouse of the Macdonald Campus of McGill University.…”

Section: Methodsmentioning

confidence: 99%

Response of an Indeterminate Soybean {Glycine Max (L.) Merr} to Chronic Water Deficit During Reproductive Development Under Greenhouse Conditions

Atti¹,

Bonnell²,

Smith³

et al. 2004

Canadian Water Resources Journal / Revue canadienne des ressour

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Although crops are commonly exposed to chronic moderate water deficit stress, most research has been focused on catastrophic and extreme moisture deficit stress. A greenhouse experiment was conducted to: (i) assess the impact of chronic water stress, during reproductive development, on soybean growth and productivity; (ii) determine the effects of water stress on soybean canopy architecture; and (iii) evaluate changes in canopy reflectance due to water deficit. Soybean plants were grown under three moisture regimes: daily watering at 100% (control), 50% (medium stress W2) and 25% (severe stress W1) of evapotranspiration. Water stress during reproductive development decreased plant physiological activity, vegetative growth, and productivity and had a visible impact on plant canopy architecture at both stress levels. Water deficit reduced leaf chlorophyll content at the severe stress level. At the physiological level, the major effect of chronic water stress was a decrease in stomatal conductance. Water stress decreased the rate of plant vegetative growth for all variables measured, suggesting that water deficit during reproductive growth might have induced an early switch of plant development from vegetative to reproductive. Water deficit, at W1 and W2, did not affect the pod dry weight to total canopy dry weight ratio. This suggested that the proportional allocation of dry matter to reproductive structures was maintained and, although the stress was imposed during reproductive development, vegetative and reproductive structures were equally affected. This may be a function of the indeterminate nature of the soybean cultivar. Paraheliotropism behaviour was observable at W2, but not at W1. Thus, there might be a threshold stress level beyond which leaf movement cannot be activated, preventing control of transpiration through canopy movement. Water stress affected the spectral reflectance signature of soybean leaves, increasing leaf reflectance in the visible and decreasing it in the infrared spectral ranges at both stress levels.Résumé : Bien que les cultures soient communément exposées à la sécheresse chronique modérée, la recherche se concentre sur les déficits hydriques catastrophiques et extrêmes. Dans cet article, nous décrivons une expérimentation conduite en serre pour : (i) évaluer l'impact du déficit hydrique sur la croissance et productivité du soja (Glycine max (L.) Merr.); (ii) déterminer les effets du stress sur l'architecture de la canopée du soya; et (iii) évaluer l'effet du stress sur la réflectivité de la canopée. Les plantes de soja furent cultivées sous trois régimes d'irrigation : arrosage journalier à 100% (contrôle W3), 50% (stress moyen W2) et 25% (stress sévère W1) de l'évapotranspiration. Le stress hydrique diminua l'activité physiologique, la croissance végétative, et productivité du soja, et affecta l'architecture de la canopée aux deux niveaux de stress. Le stress hydrique a diminué le contenu foliaire en chlorophylle pour le stress sévère. Au niveau physiologique, l'effet maj...

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Section: Methodsmentioning

confidence: 99%

Response of an Indeterminate Soybean {Glycine Max (L.) Merr} to Chronic Water Deficit During Reproductive Development Under Greenhouse Conditions

Atti¹,

Bonnell²,

Smith³

et al. 2004

Canadian Water Resources Journal / Revue canadienne des ressour

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“…The sweetpotato cultivar Tanzania is known for its development plasticity that remobilizes assimilates from the shoots to the storage roots under drought, while the cultivar Jonathan avoids drought due to its morphology such as small leaf size that reduces the transpiration surface. The size of the transpiring leaf and stem areas determine the amount of water loss by a plant (Monneveux and Belhassen 1996). Shoot biomass production and vine survival are necessary along with drought escape or avoidance in drought-prone areas.…”

Section: Introductionmentioning

confidence: 99%

Genotype × environment interaction and selection for drought adaptation in sweetpotato (Ipomoea batatas [L.] Lam.) in Mozambique

et al. 2016

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Sweetpotato is grown throughout the year in Mozambique but drought affects storage root yield and biomass productivity. The objectives of this research were to estimate the impact of genotype 9 environment interactions (G 9 E) in sweetpotato and select genotypes based on drought indices such as geometric mean, percent yield reduction, drought sensitivity index and harvest index. A total of 58 clones were evaluated during the dry season of 2006, 2008 and 2009. Two treatments were applied for this multi-year trial: full irrigation and without irrigation at the middle of root initiation growth stage. The field layout was a randomized complete block design with three replications. 'Jonathan', 'Resisto' and 'Tanzania' were the check cultivars in each treatment. Storage root and vine yields were recorded at harvest in the trials. Harvest index was computed from the yield data. The analysis of variance, regression and the additive main effects multiplicative interaction (AMMI) analyses, plus phenotypic coefficient of variation and ecovalence were used for dissecting the G 9 E and assessing the stability of each clone. Treatment, genotype 9 treatment and genotype 9 year (G 9 Y) interactions had highest contributions to the variation in storage root yield observed among clones. The stability of harvest index was significantly correlated with the absolute AMMI's IPCA1 and IPCA2 values for storage root yield. Cultivar performance varied within treatments. Four clones had significantly higher storage root yield (t ha -1 ) than 'Tanzania', the best check cultivar under drought. In conclusion, storage root yield (t ha -1 ) was negatively affected by drought and G 9 Y interaction. Harvest index stability and the geometric mean may be key to identify clones with storage root yield stability and high storage root yield under both treatments. At least two environments should be used at early breeding stages to consider harvest index in the early breeding cycle.

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“…(Figure 3 a,b). (Monneveux & Belhassen, 1997). De ce fait, ces changements imposent la réflexion sur les stratégies à entreprendre pour comprendre les mécanismes mis en jeu par les plantes afin de s'adapter aux nouvelles conditions de l'environnement et de maintenir leur croissance et leur productivité (Belkhodja & Bidai, 2004 ;Trinchant et al, 2004).…”

Section: Resultatsunclassified

Adaptation des semis de Pin pignon (<i>Pinus pinea</i> L.) au stress combiné hydrique et thermique par des marqueurs biochimiques

Touaba¹,

Alatou²

2017

J. App. Bioscience.

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RESUMEObjectif : L'objectif de ce travail consiste à analyser les effets d'un stress hydrique et thermique sur des semis de pin pignon élevés en conditions semi-contrôlées. Les variations de la teneur en proline, en sucres solubles et en pigments chlorophylliens sont suivies chez les différents organes (aiguilles, tiges et racines). Méthodologie et Résultats : Trois niveaux de stress hydrique sont identifiés selon la saturation en eau du sol à 75%, 55% et 35% ; le stress thermique est réalisé à des températures croissantes de 38°C, 44°C, et 50°C pendant une durée de 3 heures afin de quantifier le taux des marqueurs biochimiques sur les semis âgés d'une année. Les résultats obtenus montrent une augmentation significative de la proline au niveau des aiguilles à 38°C et des taux importants de sucres solubles au niveau des aiguilles à 25°C (témoin), 38°C, 44°C et 50°C, alors qu'une diminution est remarquée pour leurs pigments chlorophylliens. Mots-clés : Pin pignon, stress, marqueurs biochimiques, proline, sucres solubles, chlorophylle.ABSTRACT Objective: Objective of the present study was to analyze the effects of water and thermal stress on seedlings stone pine grown under semi-controlled conditions. Variations in proline, soluble sugars and chlorophyll pigments contents were monitored for different organs (leaves, stems and roots). Methodology and Results: Three levels of water stress were identified according to water saturation in the soil at 75%, 55% and 35%; the thermal stress was carried out at increasing temperatures of 38 ° C., 44 ° C. and 50 ° C for a time period of 3 hours; In order to quantify the evolution of biochemical markers on oneyear-old seedlings. The obtained results showed a significant increase in rate of proline in leaves at 38 ° C; And an important rate of soluble sugars in the leaves at 25°C. (Control), 38°C, 44°C and 50 ° C, however, a decrease in their chlorophyll pigments was noticed.

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The diversity of drought adaptation in the wide

Cited by 35 publications

References 24 publications

Response of an Indeterminate Soybean {Glycine Max (L.) Merr} to Chronic Water Deficit During Reproductive Development Under Greenhouse Conditions

Response of an Indeterminate Soybean {Glycine Max (L.) Merr} to Chronic Water Deficit During Reproductive Development Under Greenhouse Conditions

Genotype × environment interaction and selection for drought adaptation in sweetpotato (Ipomoea batatas [L.] Lam.) in Mozambique

Adaptation des semis de Pin pignon (<i>Pinus pinea</i> L.) au stress combiné hydrique et thermique par des marqueurs biochimiques

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