Pigments and photosynthesis of understory grasses: Light irradiance and soil moisture effects

Selzer, Luciano Javier; Busso, Carlos

doi:10.1134/s1021443716020126

Cited by 8 publications

(3 citation statements)

References 31 publications

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“…Physiological alterations induced by PPT in plants expressing the bar gene still remain unclear [46]. Chlorophylls and carotenoids are the main components of the photosynthetic apparatus, and change in their content could provide information on the physiological state of leaves [47]. Chlorophyll content [7] and fluorescence [48] are among well-known signs in assessing plants' damage after stress treatment.…”

Section: Discussionmentioning

confidence: 99%

Effect of Phosphinothricin on Transgenic Downy Birch (Betula pubescens Ehrh.) Containing bar or GS1 Genes

Lebedev

Krutovsky

Shestibratov

2019

Forests

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Weeds are a big problem in agriculture and forestry, and herbicides are the main tools to control them. Phosphinotricin (ammonium glufosinate, PPT) is one of the most effective non-selective herbicides, to which weeds hardly gain resistance, but the reasons for its effect and toxicity to plants are still unclear, and especially, it is little studied in trees, including transgenic ones. We studied the physiological responses of downy birch (Betula pubescens Ehrh.) containing the herbicide resistance bar gene or the cytosol glutamine synthetase GS1 gene (the target enzyme of the herbicide) to PPT-based Basta herbicide treatment in various doses under open-air conditions during two years. Birch saplings with the bar gene were resistant to a double field dose (10 L/ha), but the expression of the GS1 gene only slightly increased resistance compared to the control. Herbicide treatment increased the ammonium level in leaf tissue by 3–8 times, but this, apparently, was not the main cause of plant death. Among leaf pigments, chlorophyll B was the most resistant to PPT, and carotenoids were the most sensitive. Responses of birch trees with the GS1 gene (accumulation of ammonium, pigment content, and dehydration) during treatment with a low dose of herbicide were less pronounced than in control plants. One-year-old control and transgenic plants with the GS gene died after 2.5 L/ha treatment, and two-year-old plants lost foliage after such treatment but remained alive and developed buds four weeks after treatment. Herbicide treatment of plants with the bar gene did not cause significant deviations in height (first year) or the accumulation of aboveground biomass (second year). The obtained results improve our understanding of the effect of PPT on woody plants and can be used both to clarify mechanisms of herbicide action and in plantation forestry.

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Section: Discussionmentioning

confidence: 99%

Effect of Phosphinothricin on Transgenic Downy Birch (Betula pubescens Ehrh.) Containing bar or GS1 Genes

Lebedev

Krutovsky

Shestibratov

2019

Forests

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“…Moisture is an important factor affecting the photosynthetic, physiological characteristics of plants [22]. Soil moisture affects crop photosynthetic rate [23]. The amount of irrigation and mulching will affect soil moisture content, affecting the water absorption of crops, and ultimately impacting the photosynthesis of crops.…”

Section: Effect Of Irrigation Amount On P N and T R Of Degradable Filmentioning

confidence: 99%

Combined Effect of Different Amounts of Irrigation and Mulch Films on Physiological Indexes and Yield of Drip-Irrigated Maize (Zea mays L.)

Wang

Zhang

et al. 2019

Water

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Exploring the effect of irrigation on biodegradable film-covered drip-irrigated maize is essential for sustainable agricultural development in arid areas. These regions, like Xinjiang in China, are home to suitable irrigation and biodegradable films. Through field trials, four levels of irrigation, and two biodegradable films and one common polyethylene film were set up to study the effects of different treatments on the physiology, growth indicators, and yield of maize. The results showed that the effects of irrigation and biodegradable films on the photosynthetic index and fluorescence index of maize reached a very significant level (p < 0.01). The effect of single factor irrigation and biodegradable films on the photosynthetic index and fluorescence index of maize reached a significant level (p < 0.05). The photosynthesis index, fluorescence index, plant height, LAI (leaf area index) and yield of W3M3 treatment had the highest value, when compared with other treatments. The W1M1 treatment had the lowest value. The photosynthesis index, fluorescence index, plant height, LAI, and yield of the W3M2 treatment were second only to W3M3. In addition, the output was only 40 kg ha−1 less than W3M3. W3M2 has the best treatment effect from a perspective of sustainable agricultural development and efficient water saving; the optimal irrigation amount was 5625 m3 ha−1, induction period was 60 d, and thickness was 0.01 mm. The results of this study are of guiding significance for the promotion of the use of biodegradable films, search for suitable irrigation, and development of low-carbon agriculture.

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“…The literature shows several studies conducted on chlorophyll content suggesting that by monitoring and evaluating chlorophyll content in tree leaves and plants, their responses to environmental stressors, weather and climatic conditions, as well as anthropogenic conditions can be inferred [6]. Chlorophyll content has been shown to be a reliable factor for evaluating plant-life processes and their resistance to stressful conditions such as humidity and temperature changes [7]. One study showed that the decline in chlorophyll content is very fast when plants are in high stress condition and very similar to the changes in pigment during leaf senescence [8].…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Effects of Environmental Stress on Leaf Chlorophyll Content as an Index for Tree Health

Talebzadeh

Valeo

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Chlorophyll content plays a vital role in photosynthetic and biomass production in all plants. Because chlorophyll shows a greater sensitivity to changes in external conditions than do other pigments in foliage, such as carotenoids for example, chlorophyll content in leaves may be a good surrogate for environmental stress, changes in temperature and humidity, as well as in pollutant levels both in the air and in the soil. This paper reviews the potential for chlorophyll content in the leaves of trees as a measure of tree health, resistance to stress and environmental conditions. Because chlorophyll content is shown to decrease dramatically with increases in pollution, non-destructive methods for evaluating the amount of chlorophyll in leaves and its changes over a time may be a sufficient indicator for environmental pollutant levels in the air, in the soil and in the water used by a tree.

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Pigments and photosynthesis of understory grasses: Light irradiance and soil moisture effects

Cited by 8 publications

References 31 publications

Effect of Phosphinothricin on Transgenic Downy Birch (Betula pubescens Ehrh.) Containing bar or GS1 Genes

Effect of Phosphinothricin on Transgenic Downy Birch (Betula pubescens Ehrh.) Containing bar or GS1 Genes

Combined Effect of Different Amounts of Irrigation and Mulch Films on Physiological Indexes and Yield of Drip-Irrigated Maize (Zea mays L.)

Evaluating the Effects of Environmental Stress on Leaf Chlorophyll Content as an Index for Tree Health

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