Heat and water stressed field-grown soybean: A multivariate study on the relationship between physiological-biochemical traits and yield

Ergo, Verónica V.; Lascano, Ramiro; Vega, Claudia Rosa Cecilia; Parola, Rodrigo; Carrera, Constanza Soledad

doi:10.1016/j.envexpbot.2017.12.023

Cited by 66 publications

(59 citation statements)

References 96 publications

(138 reference statements)

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“…Over the past few decades, the frequency and intensity of regional and global extremes in water deficits have increased. Its impact on growth, morphology, and physiological processes within the aboveground and belowground parts of a plant can be measured in several ways, e.g., gas exchange, stomatal conductance, water relations, root longevity, leaf water potential, activity of phytohormones and reactive oxygen species, cell division, nutrient assimilation and transport, and metabolic processes ( Ergo et al, 2018 ; Rahmati et al, 2018 ). Under drought conditions, plants generally close their stomata to minimize water losses, thereby reducing photosynthetic capacity.…”

Section: Introductionmentioning

confidence: 99%

Effects of Exogenous Dopamine on the Uptake, Transport, and Resorption of Apple Ionome Under Moderate Drought

et al. 2018

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The frequency and intensity of water deficits is expected to increase because of global warming. Drought stress is often one of the most limiting factors for plant growth. We conducted greenhouse pot experiments to address how dopamine affects the drought-resistance traits of apple trees at the physiological and molecular levels. Our factorial design consisted of dopamine and no-dopamine applications combined with well-watered and moderate-drought conditions. Seedling biomass, photosynthesis rates, chlorophyll concentrations, and stomatal apertures were markedly reduced under stress but dopamine treatment mitigated the inhibiting effects of drought on plant growth and helped maintain strong photosynthesis, chlorophyll levels, and stomatal functioning. Concentrations of most macro-, micro-, and trace elements decreased in response to drought. This stress also diminished the uptake and transport of elements in the leaves and stems, but increased the partitioning of elements in the roots. Nutrient resorption proficiency decreased while nutrient resorption efficiency increased for most analyzed elements. Exogenous dopamine significantly increased the concentrations, uptake, and transport of nutrients under drought stress, and also altered their distribution within the whole plant. However, this molecule had a negative effect on nutrient resorption. Although transcript levels of a key chlorophyll degradation gene, pheide a oxygenase, and senescence-associate gene 12 were elevated upon drought treatment, dopamine significantly suppressed the upregulation of those genes under such stress conditions. These observations indicate that dopamine has an important anti-senescence effect that might be helpful for regulating nutrient uptake, transport, and resorption, and ultimately influencing overall plant growth. Thus, understanding the role of dopamine in drought tolerance introduces new possibilities to use this compound for agricultural purposes.

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Section: Introductionmentioning

confidence: 99%

Effects of Exogenous Dopamine on the Uptake, Transport, and Resorption of Apple Ionome Under Moderate Drought

et al. 2018

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“…This is particularly relevant for crops such as maize (Zea mays L.), which accounts for a high percentage of total cereal production worldwide. Heat stress can produce metabolic limitations such as ionleakage, as indicated by relative cell injury (RCI) (Saadalla et al, 1990, Howarth et al, 1991, and decreases photosystem II (PSII) activity (Sinsawat et al, 2004, Ergo et al, 2018. Inactivation of PSII by high temperature is generally not reversible (Karim et al, 1999, Sinsawat et al, 2004; however, it depends on several factors, such as growing temperatures, acclimation factors, intensity, and duration of heat stress.…”

Section: Introductionmentioning

confidence: 99%

Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering

et al. 2019

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Heat stress affects physiological traits and biomass production in major crops, including maize. We researched the responses of maximum efficiency of photosystem II (Fv/Fm), relative cell injury (RCI), stomatal conductance (gs), internal CO2 concentration (Ci), leaf photosynthesis (CER), and crop growth rate (CGR) in two maize cultivars exposed to high temperatures around silking (R1) under field conditions. Temperature regimes (i.e. control and heat) were performed during the pre-silking (–15d R1 to R1) and post-silking (R1+2d to R1+17d) periods. In the heat treatments, polyethylene shelters were used in order to increase daytime temperatures around midday (from 10 A.M. to 2 P.M.) during each period (i.e., pre- and post-silking). In the control treatments, the shelters remained open during the entire growing season. Gas exchange variables, Fv/Fm and relative cell injury (RCI) were measured on ear leaves. CGR was estimated based on biomass samples. CER and Fv/Fm presented maximum reductions at the end of the daytime heating. However, 30 min after the shelters were reopened, Fv/Fm of heated leaves reached values similar to controls, which were closely linked to CER recoveries. RCI was negatively associated with Fv/Fm, and cell injury increased gradually as heating continued. Ci was unaffected by heat treatment, indicating that gs was not the primary cause of CER reduction. Heat stress decreased CGR, and the reduction was positively associated with CER and Fv/Fm in both heating periods. We attempted to scale from cell to crop level and identify some physiological traits that could be helpful in breeding programs for heat stress tolerance.

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“…Heat and water deficit stress when simultaneously imposed can have effects that may not be seen when individually imposed. Insights into the mechanism of water stress and heat stress can be an important out put of the study and this can help in elucidating the processes that are responses to stress and also the processes that are countering stress in plants (Ergo et al 2018, Zandalinas et al 2018 . The objectives of the study was to study the Chlorophyll a fluorescence transient in wheat (Triticum aestivum) under water deficit and heat stress, the structure and function of Photosystem II, the details of electron transport chain and its role in acclimation to water deficit and heat stress in wheat (Triticum aestivum) and the individual quantitative physiological parameters by plant phenotyping that form the basis for more complex abiotic stress tolerant traits.…”

Section: Introductionmentioning

confidence: 99%

Integrated high-resolution phenotyping, chlorophyll fluorescence induction kinetics and photosystem II dynamics under water stress and heat in Wheat (Triticum aestivum)

Shanker

Coe

Sirault

2019

Preprint

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An experiment was conducted in controlled conditions in three varieties of wheat under water stress, heat and heat +water stress treatments with the objective of studying Chlorophyll a fluorescence, chlorophyll fluorescence induction kinetics and the function of Photosystem II by plant phenotyping as affected by stress. We hypothesised that during stress, specific adaptive strategies are employed by plants, such as structural and functional changes in PS II by which they acquire new homeostasis which may be protective adaptations. Water stress stress treatment was imposed on Water stress and Heat +Water stress treatments at 43 DAS.Heat treatment was imposed on 48 DAS. Maximum quantum yield of primary photochemistry was measured with PAM 2500 and OJIP was measured with FluorPen FP 100 after the onset of stress at four observation times on two days viz., pre-dawn and afternoon during stress. In addition continuous monitoring of photosynthetic efficiency was done with Monitoring PAM.Heat +Water stress stress was more detrimental as compared to Heat or Water stress alone in terms of maximum quantum yield of photochemistry. This could have been due to higher decrease in connectivity between PSII and its antennae resulting in lower photosynthetic efficiency resulting in the impairment and disruption of the electron transport. K step was observed in heat stress and heat +Water stress stress which may be because of damage to Oxygen Evolving Complex indicating that low thermostability of the complex. The stress treatments had a reduction in the plastoquinone pool size as indicated by the reduced area above the OJIP curve. Our study indicated that the instrument PAM 2500 sensed both stresses separately and combined earlier than the other instruments, so in terms of sensitivity PAM 2500 was more effective than FluorPen FP 100 and MultispeQ. Rapid screening of stress was more effectively with FluorPen FP 100 and MultispeQ than by PAM 2500.

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Heat and water stressed field-grown soybean: A multivariate study on the relationship between physiological-biochemical traits and yield

Cited by 66 publications

References 96 publications

Effects of Exogenous Dopamine on the Uptake, Transport, and Resorption of Apple Ionome Under Moderate Drought

Effects of Exogenous Dopamine on the Uptake, Transport, and Resorption of Apple Ionome Under Moderate Drought

Physiological responses and post-stress recovery in field-grown maize exposed to high temperatures at flowering

Integrated high-resolution phenotyping, chlorophyll fluorescence induction kinetics and photosystem II dynamics under water stress and heat in Wheat (Triticum aestivum)

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