Drought stress and photosynthesis in plants

Siddique, Zoya; Jan, Sumira; Imadi, Sameen Ruqia; Gul, Alvina; Ahmad, Parvaiz

doi:10.1002/9781119054450.ch1

Cited by 32 publications

(47 citation statements)

References 58 publications

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“…Within the genus Primula, Dietz and Heber (1983) reported that 370 water stressed Primula palinuri in field showed a complete wilting with MLWP equal to -4.0 MPa, 371 much lower than in our study and that the complete stomatal closure was reach with at least a water 372 loss of the 20% of turgid leaves. Here, a shift from stomatal limitation to non-stomatal limitation was 373 observed as described by Siddique et al (2016). We can hypothesize that studied plants impaired 374 carbon assimilation to cope with drought by conserving the internal CO2 and blocking photosynthesis.…”

Section: Statistical Analysis 164mentioning

confidence: 75%

“…leaf water status). In drought conditions, 181 water deficit stress leads to a progressive limitation of photosynthesis, which is a consequence of an 182 alteration in carbon assimilation (Siddique et al 2016). The opening and closing of stomata is 183 regulated by changes in turgor pressure in the guard cells that are present in epidermis and, hence, 184 this process protects plants from the dehydration and death during fluctuating environmental 185…”

Section: Statistical Analysis 164mentioning

confidence: 99%

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The influence of water stress on growth, ecophysiology and ornamental quality of potted Primula vulgaris ‘Heidy’ plants. New insights to increase water use efficiency in plant production

2017

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When citing, please refer to the published version.This full text was downloaded from iris-Aperto: https://iris.unito.it/ 1The influence of water stress on growth, ecophysiology and ornamental quality of potted 1 Efficient irrigation practices are required to reduce the amount of water used. In this study, the effects 14 of different irrigation regimes on changes in growth, ecophysiology and ornamental traits of potted 15Primula vulgaris 'Heidy' plants were investigated. Three experiments were carried out. In the first, 16 the plants were either fully irrigated (100% of container capacity) or not. In the second, plants were 17 watered to full irrigation (control), to 50% of the control (moderate water stress), to 25% of the control 18 (severe water stress), or not irrigated and followed by a rehydration phase. Both experiments were 19 conducted under controlled growth conditions. The third experiment was performed under common 20 nursery conditions in an unheated and shaded greenhouse where plants were either irrigated with 21 common irrigation practices (control), or with 66% of the control amount (moderate water stress), or 22 with 33% of the control (severe water stress). In general, the percentage of senescent plants, the 23 growth index, the number of leaves, and the aerial fresh and the dry weight were not affected by 24 moderate water stress treatments. As expected, increasing water stress resulted in a general decrease 25 in all studied gas exchange parameters. However, stressed plants were more efficient in using water 26 than control plants, suggesting that stomata closed to cope with drought conditions without damaging 27 photosynthesis events. The number of fully opened flowers during the growing season was highest 28 in both control and moderately water stressed plants. In conclusion, moderate, but not severe, water 29 stress could be imposed in Primula vulgaris 'Heidy' pot production to reduce the water consumption, 30 still maintaining plant ecophysiological performances and ornamental quality.

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Section: Statistical Analysis 164mentioning

confidence: 75%

Section: Statistical Analysis 164mentioning

confidence: 99%

The influence of water stress on growth, ecophysiology and ornamental quality of potted Primula vulgaris ‘Heidy’ plants. New insights to increase water use efficiency in plant production

2017

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“…where f is the operating frequency in gigahertz. The bandwidth of the frequency-modulated continuous-wave (FMCW) radar used in this paper is small enough to apply a linear approximation with a tolerable error, as it is presented in the right side of (1) and (2). The absolute value of the relative error at 23.1 GHz when the linear approximation is applied to r and r is 0.02% and 0.12%, respectively.…”

Section: A Dielectric Properties Of Water Found In Vegetationmentioning

confidence: 99%

“…It is important to note that in order to simplify the final expression for V g and taking into account that r and r possess similar values at the working frequency (23.1 GHz), r and r can be replaced in (5) by one half of the sum of r and r after applying the linear approximation given by (1) and (2). In this way, the final expression for V g is given by The group velocity at the central working frequency (23.1 GHz) using (5) is 0.737 • 10 8 m/s.…”

Section: A Dielectric Properties Of Water Found In Vegetationmentioning

confidence: 99%

“…W ATER availability is one of the key factors that determine agricultural production worldwide [1]. Water is essential for transpiration, a process directly coupled with photosynthesis and, therefore, with carbohydrate production [2]. Growers need tools that allow a proper estimation of plant water status in order to adjust irrigation to plant water requirement, to maximize crop water efficiency, and to avoid unnecessary periods of water shortage [3].…”

Section: Introductionmentioning

confidence: 99%

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Water Content Continuous Monitoring of Grapevine Xylem Tissue Using a Portable Low-Power Cost-Effective FMCW Radar

Quemada

Gonzalez

Iriarte

et al. 2019

IEEE Trans. Geosci. Remote Sensing

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This paper presents the real-time monitoring of a grapevine's water content that flows up through the xylem tissue by means of a frequency-modulated continuous-wave radar. The application of an optimization process, based on the superresolution multiple signal classification algorithm, has enabled the reduction of the bandwidth required to discern the xylem water content and, thus, the operating frequency, achieving a depth resolution of at least 3 mm. This design advantage has resulted in a significant step forward toward a real life application, allowing the use of fully-integrated off-the-shelf components in order to implement a completely portable low-power cost-effective radar at 23.1 GHz with a 3.4-GHz bandwidth. The sensor performance has been evaluated by means of three different experiments: irrigation cycles, day/night cycles, and comparison between irrigation cycles at different temperatures. From the experimental results, it is possible to assert that the contactless sensor presented in this paper is very sensitive to changes in the plant's water content, differentiating between daytime and nighttime. In addition, it has been proven that temperature has a noticeable influence over the evapotranspiration, observing negative drying slopes of 5.62 and 6.28 mV/cycle at 23°C and 26°C, respectively.

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Toward Understanding the Regulation of Photosynthesis under Abiotic Stresses: Recent Developments

Hussain

2019

Photosynthesis, Productivity and Environmental Stress

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Drought stress and photosynthesis in plants

Cited by 32 publications

References 58 publications

The influence of water stress on growth, ecophysiology and ornamental quality of potted Primula vulgaris ‘Heidy’ plants. New insights to increase water use efficiency in plant production

The influence of water stress on growth, ecophysiology and ornamental quality of potted Primula vulgaris ‘Heidy’ plants. New insights to increase water use efficiency in plant production

Water Content Continuous Monitoring of Grapevine Xylem Tissue Using a Portable Low-Power Cost-Effective FMCW Radar

Toward Understanding the Regulation of Photosynthesis under Abiotic Stresses: Recent Developments

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