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

Talebzadeh, Fatemeh; Valeo, Caterina

doi:10.1088/1755-1315/1006/1/012007

Cited by 19 publications

(13 citation statements)

References 19 publications

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“…The other most common group of plant pigments, typical for all photosynthetic organisms, are carotenoids. They are secondary metabolites of plants, which as auxiliary pigments, transfer the absorbed energy to chlorophyll and also protect chlorophyll from excessive light intensity [7]. We found similar levels of total carotenoid content to those in the control plant, for S. cymosa, A. carpatica, and G. repens in two studied years.…”

Section: Discussionsupporting

confidence: 70%

“…One of the typical characteristics of alpine plants is reduced chlorophyll content. The chlorophyll content could be a variety-specific and species-specific characteristic [7], [10], [12]- [15] due to changes in altitude and high-mountain environmental conditions. Our data show that changes in chlorophyll a and chlorophyll b content could be due to: species-specific features, UV intensity of studied year and rapid decrease of chlorophyll b content than the chlorophyll a content.…”

Section: Discussionmentioning

confidence: 99%

“…Another important indicator for plant photosynthetic activity and for plant status under specific conditions is the chlorophyll a/b ratio [13]- [15]. In higher plants, chlorophyll a has higher amounts of total chlorophyll, and thus, the ratio of chlorophyll a to b is about 3:1 [7] [11], [16]. Our data showed that, under specific alpine conditions at the Moussala peak for a two-year study period, values of the chlorophyll a/b ratio were in a close but normal range (3:1), for all wild-growing species.…”

Section: Discussionmentioning

confidence: 99%

“…It was reported that chlorophylls are with greater sensitivity to changes in environmental conditions than carotenoids. Thus, leaf chlorophyll content could be a good indicator of environmental stress; changes: in temperature, humidity, air, and soil pollutant levels [7]. Another important plant pigments are carotenoids, which could be found in all photosynthetic organisms.…”

Section: Introductionmentioning

confidence: 99%

“…Carotenoids are important for protecting chlorophyll from intensive sunlight. It was shown that in cases of environmental stress, chlorophyll content decreases more rapidly than carotenoid content [7]. The method for measurement of pigment content is quick and easy and for this reason, research on pigment content is becoming more and more common.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Pigment Content on Wild Growing Plants in Moussala Peak

Angelova¹,

Tyutyundzhiev²,

Angelov³

et al. 2022

RAD Conference Proceedings

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The highest peak on Rila Mountain is Moussala (2925 m a. s. l.). Its climate conditions depend on the geographic location, peculiarities of relief, and atmospheric circulation, and a specific microclimate is formed. In alpine regions, conditions become extremely variable with the increase in altitude. Plants that are growing in alpine conditions are exposed to the combined impact of environmental factors such as altitude, prolonged UV irradiation, low temperature, etc. This study aims to compare and assess whether the pigment content of wild-growing species at Moussala peak changes in the two following years. As plant material was used following species: Saxifraga cymosa Waldst & Kit (Saxifragaceae), Anthemis carpatica Waldst. & Kit. ex Willd. (Asteraceae), Geum repens (Rosaceae), Doronicum columnae Ten.(Asteraceae), Achillea clusiana L. (Asteraceae), Allium sibiricum L. (Liliaceae) and Festuca valida (R.Uechtr.) Pénzes (Poaceae). Plants were collected from Moussala Peak in July-August, in two successive growing seasons of 2020 and 2021. Data for the average daily value of "Erythemal UV irradiance" response (UVE) for the experimental site at Rila Mountain (2925 m a. s. l.) were measured with a UV sensor. Average daily values for July and August are calculated. Photosynthetic pigment content was applied as an endpoint. It was obtained that genotype response varies depending on the environmental conditions of the studied year. Data for UV irradiation at Moussala peak for a period of two following years 2020-2021 show insignificant change. Radiation conditions at Moussala peak show that both years differed in UVE response, but this small change of UV irradiation for one year is probably insignificant. The levels of total chlorophylls, chl. a, chl. b and total carotenoids for most of the studied alpine plants measured for 2021 were insignificantly higher in comparison with those measured for 2020. Only for S. cymosa were evaluated significantly higher pigment levels in 2021 than those in 2020. The chlorophyll a/b ratio was stable for all studied wild species growing at this altitude. The chlorophyll a/b ratio also varies depending on the studied genotype and different radiation conditions of the years studied. Our preliminary data indicate a change in pigment content depending on the different environmental conditions in the respective years and alpine plants examined. Data for radiation conditions at Moussala peak show that both years differed in UVE response, but this small change of UV irradiation for one year is probably insignificant. Changes in pigment content in some of the studied alpine genotypes propose different adaptive strategies to overcome the environmental stress at this altitude. Because alpine conditions at Moussala peak are related to the various impacts of extreme environmental factors on the pigment content of plants, further studies are needed to understand the mechanisms of interaction of factors and plant response in the long-term aspect of time.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of Pigment Content on Wild Growing Plants in Moussala Peak

Angelova¹,

Tyutyundzhiev²,

Angelov³

et al. 2022

RAD Conference Proceedings

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The effect of industrial and urban dust pollution on the ecophysiology and leaf element concentration of Tilia cordata Mill.

Bierza,

Bierza

2024

Environ Sci Pollut Res

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The influences of airborne trace elements in urban dust on element concentrations and functional traits of Tilia cordata were examined. For the present study, the unwashed and washed leaves of T. cordata were collected to assess the concentration of metals in Katowice City, Poland, from sites of different traffic intensity and industry activity. The content of Al, Cd, Cr, Cu, Fe, Mn, Pb, Zn, C, and N was measured. Additionally, a number of functional traits such as photosynthetic pigment content, specific leaf area (SLA), leaf dry matter content (LDMC), and diseased areas of the leaves were determined to assess the impact of the polluters on the physiology of the trees and their resources acquisition strategy. We hypothesized that the photosynthetic pigments of T. cordata will decrease with the traffic and industry intensity, and the traits related to the resources acquisition and stress resistance will shift into a more conservative strategy. The Principal Component Analysis and the Inverse Distance Weighting (IDW) interpolation method helped to identify that the Fe, Zn, Al, and Cr were related mainly to traffic intensification and Pb to industrial activities. The results indicate that Katowice is considerably polluted by Zn (up to 189.6 and 260.2 mg kg−1 in washed and unwashed leaves, respectively), Pb (up to 51.7 and 133.6 mg kg−1), and Cd (up to 2.27 and 2.43 mg kg−1) compared to other cities worldwide. Also, a reduction of approximately 27% in the photosynthetic pigments was observed at the high-traffic and industrial sites. The trees from the mainly affected areas with heavy traffic and industry tend to apply a conservative resources strategy with a decrement in SLA and an increment in LDMC. In contrast, the opposite trend was observed at the less affected sites (high SLA, low LDMC). The study showed that unfavourable urban conditions can trigger a plastic response on multiple levels. Knowledge of the possible paths of adaptation to urban conditions of different plant species is nowadays crucial to appropriate urban greenery planning.

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