Metabolic indicators of drought stress tolerance in wheat: Glutamine synthetase isoenzymes and Rubisco

Nagy, Zoltán; Németh, Edit; Guóth, Adrienn; Bóna, L.; Wodala, Barnabás; Pécsváradi, Attila

doi:10.1016/j.plaphy.2013.03.001

Cited by 86 publications

(73 citation statements)

References 30 publications

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“…This primarily results in glutamine, which is catalysed by GS. Drought sensitivity and light dependence were previously reported in wheat (Nagy et al, 2013;Setién et al, 2013). In the two durum cultivars, the GS activity similarly decreased during water deprivation at low temperature.…”

Section: Discussionsupporting

confidence: 73%

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Reduced light and moderate water deficiency sustain nitrogen assimilation and sucrose degradation at low temperature in durum wheat

Majláth

Darkó

Palla

et al. 2016

Journal of Plant Physiology

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(I. Majláth). 2 SUMMARYThe rate of carbon and nitrogen assimilation is highly sensitive to stress factors, such as low temperature and drought. Little is known about the role of light in the simultaneous effect of cold and drought. The present study thus focused on the combined effect of mild water deficiency and different light intensities during the early cold hardening in durum wheat (Triticum turgidum ssp. durum L.) cultivars with different levels of cold sensitivity. The results showed that reduced illumination decreased the undesirable effects of photoinhibition in the case of net photosynthesis and nitrate reduction, which may help to sustain these processes at low temperature. Mild water deficiency also had a slight positive effect on the effective quantum efficiency of PSII and the nitrate reductase activity in the cold. Glutamine synthesis was affected by light rather than by water deprivation during cold stress. The invertase activity increased to a greater extent by water deprivation, but an increase in illumination also had a facilitating effect on this enzyme. This suggests that both moderate water deficiency and light have an influence on nitrogen metabolism and sucrose degradation during cold hardening. A possible rise in the soluble sugar content caused by the invertase may compensate for the decline in photosynthetic carbon assimilation indicated by the decrease in net photosynthesis. The changes in the osmotic potential can be also correlated to the enhanced level of invertase activity. Both of them were regulated by light at normal water supply, but not at water deprivation in the cold. However, changes in the metabolic enzyme activities and osmotic adjustment could not be directly contributed to the different levels of cold tolerance of the cultivars in the early acclimation period.

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Section: Discussionsupporting

confidence: 73%

“…The efficiency of photosynthesis is light-dependent and provide ATP and the carbon skeleton for amino acid synthesis. Beside light, the abundance of GS and RuBisCO showed a positive correlation with the severity of stress, including low temperature (Simonović and Anderson, 2007) and drought (Bernard et al, 2008;Nagy et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Reduced light and moderate water deficiency sustain nitrogen assimilation and sucrose degradation at low temperature in durum wheat

Majláth

Darkó

Palla

et al. 2016

Journal of Plant Physiology

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“…Soil-induced water deficit stress reduced leaf area development and plant height, causing spatial variation in the crop canopy throughout the field. It also invoked an earlier senescence of the leaves [49]. For M1, the lighter-colored areas corresponded to average plant water content: 64%, LAI: 2.27 and dry biomass: 0.80 kg·m −2 , whereas within the greenish areas, the same parameters were higher, with plant water content: 74%, LAI: 3.61 and dry biomass: 0.92 kg·m −2 .…”

Section: Qualitative Assessment Of the Acquired Uav Imagerymentioning

confidence: 94%

Monitoring Agronomic Parameters of Winter Wheat Crops with Low-Cost UAV Imagery

et al. 2016

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Abstract:Monitoring the dynamics in wheat crops requires near-term observations with high spatial resolution due to the complex factors influencing wheat growth variability. We studied the prospects for monitoring the biophysical parameters and nitrogen status in wheat crops with low-cost imagery acquired from unmanned aerial vehicles (UAV) over an 11 ha field. Flight missions were conducted at approximately 50 m in altitude with a commercial copter and camera system-three missions were performed between booting and maturing of the wheat plants and one mission after tillage. Ultra-high resolution orthoimages of 1.2 cm·px −1 and surface models were generated for each mission from the standard red, green and blue (RGB) aerial images. The image variables were extracted from image tone and surface models, e.g., RGB ratios, crop coverage and plant height. During each mission, 20 plots within the wheat canopy with 1 × 1 m 2 sample support were selected in the field, and the leaf area index, plant height, fresh and dry biomass and nitrogen concentrations were measured. From the generated UAV imagery, we were able to follow the changes in early senescence at the individual plant level in the wheat crops. Changes in the pattern of the wheat canopy varied drastically from one mission to the next, which supported the need for instantaneous observations, as delivered by UAV imagery. The correlations between the biophysical parameters and image variables were highly significant during each mission, and the regression models calculated with the principal components of the image variables yielded R 2 values between 0.70 and 0.97. In contrast, the models of the nitrogen concentrations yielded low R 2 values with the best model obtained at flowering (R 2 = 0.65). The nitrogen nutrition index was calculated with an accuracy of 0.10 to 0.11 NNI for each mission. For all models, information about the surface models and image tone was important. We conclude that low-cost RGB UAV imagery will strongly aid farmers in observing biophysical characteristics, but it is limited for observing the nitrogen status within wheat crops.

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“…Total acrylamide concentration of 3.13% and 10% was applied for stacking and separating gels respectively. Bisacrylamide contents were 20% and 5% of total acrylamide concentration [27].…”

Section: Separation Of Pod Isoenzymesmentioning

confidence: 98%

The effects of putrescine are partly overlapping with osmotic stress processes in wheat

et al. 2018

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Metabolic indicators of drought stress tolerance in wheat: Glutamine synthetase isoenzymes and Rubisco

Cited by 86 publications

References 30 publications

Reduced light and moderate water deficiency sustain nitrogen assimilation and sucrose degradation at low temperature in durum wheat

Reduced light and moderate water deficiency sustain nitrogen assimilation and sucrose degradation at low temperature in durum wheat

Monitoring Agronomic Parameters of Winter Wheat Crops with Low-Cost UAV Imagery

The effects of putrescine are partly overlapping with osmotic stress processes in wheat

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