Effects of temperature and irradiance on photosystem activity during Alhagi sparsifolia leaf senescence

Wang, Xue; Li, X. Y.; Zhu, Juanjuan; Lin, Lijin

doi:10.1007/s10535-012-0145-8

Cited by 12 publications

(7 citation statements)

References 17 publications

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“…But in any case, Figures 1(a)-(f) clearly show that every treatment with diesel exhaust has adverse effects on the photosynthetic capacity of the lichens. Such loss of function in PSII may have various causes like inhibited energy transfer from carotenoids to chlorophyll, damage of PSII reaction center complex, increased heat dissipation in PSII antennae to avoid damage, blocked electron transport [37] or inhibition of the repair of PSII because of diminished supply of ATP [38].…”

Section: Resultsmentioning

confidence: 99%

Sensitivity of Lichens to Diesel Exhaust under Laboratory Conditions

Langmann¹,

Madl²,

Türk³

et al. 2014

JEP

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Lichen vegetation reacts very sensitively to a variety of air pollutants including increased nitrogen concentrations as well as to traffic exhaust in general, which makes lichens reliable monitoring organisms for atmospheric pollution. Recent environmental studies have shown that decreasing abundance of acidophytic lichen species and the increase of nitrophytic lichens can be explained by elevated levels of atmospheric nitric-compounds adsorbed onto nanoparticles. One major source of these atmospheric compounds amongst a wider pollution inventory is diesel exhaust-a mixture of gases and particle matter. This study aimed to shed light on the impact of diesel exhaust on the viability of six differently sensitive lichen species. Diesel exhaust particle concentrations in the laboratory experiments resembled those at a local highway during rush hour. By incubation in a closed stainless steel chamber we could exclude influences from other pollutants than diesel exhaust providing explicit data about the effects of diesel exhaust on lichens. The investigations revealed effects on the photosynthesis of the lichen photobionts and hence the lichen vitality. The conclusions of this study are that 1) the photobiont is affected stronger as the mycobiont and 2) older parts of the lichen are damaged first. Another remarkable result of this study is that 3) these lichens are regenerating to some extent during incubation-free periods-unless the organism is not damaged too much to restore photosynthetic activity. To our knowledge this is the first study evaluating the impact of diesel exhaust on lichens under laboratory conditions separate from other interfering pollutants.

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Section: Resultsmentioning

confidence: 99%

Sensitivity of Lichens to Diesel Exhaust under Laboratory Conditions

Langmann¹,

Madl²,

Türk³

et al. 2014

JEP

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“…The formation of root biomass conformed to a logistic 'slow-quick-slow' growth curve, and total biomass decreased with intensity of soil drought (Zeng et al 2012). Normal senescence of A. sparsifolia begins in late August, and during leaf senescence, the maximum photochemical quantum yield remained relatively high (Xue et al 2012). In addition, leaf senescence of A. sparsifolia can induced by the reduction of daily sunshine period and increase of temperature (Xue et al 2012).…”

Section: Introductionmentioning

confidence: 81%

“…Normal senescence of A. sparsifolia begins in late August, and during leaf senescence, the maximum photochemical quantum yield remained relatively high (Xue et al 2012). In addition, leaf senescence of A. sparsifolia can induced by the reduction of daily sunshine period and increase of temperature (Xue et al 2012). In our experiment, we increased the carbohydrate concentrations in leaves and observed the process of leaf senescence by conducting stem girdling of A. sparsifolia.…”

Section: Introductionmentioning

confidence: 99%

Impact of girdling and leaf removal on Alhagi sparsifolia leaf senescence

Guo-Ning

Lin

et al. 2015

Plant Growth Regul

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Leaf senescence can be described as the dismantling of cellular components during the terminal stage in the development of plant organs and tissues. In order to determine the leaf senescence process when stem girdling and leaf removal both exist. An experiment was carried out in Alhagi sparsifolia, which grew in the Cele oasis-desert transitional zone with the treatment of control (CK), phloem girdling (PG), leaf removal (LR), and combined girdling and removal (GR). Some parameters related to leaf senescence were measured at the 1st and 30th day postgirdling. The results showed that after PG and GR, leaf soluble sugar content, starch content, abscisic acid content, proline content, and malondialdehyde content increased substantially and leaf photosynthetic rate, stomatal conductance, transpiration rate, photosynthetic pigment content, and water potential decreased substantially compared with CK. It also changed much more in PG leaves than in GR leaves. The change in LR leaves was opposite to that of PG and GR leaves, but the change was rather slight. The result of the present work implied that senescence of leaves treated with PG greatly accelerates, and the accumulation of carbohydrates and ABA in leaves is probably the main reason for this. Separate LR could play a role in delaying leaf senescence in plants; however, this delay effect was not obvious. Nevertheless, partial removal of leaves led to a significant compensation of girdling effects, i.e., senescence will be delayed significantly in girdled leaves when treated with partial LR.

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“…The analysis of Chl fluorescence parameters is helpful to ascertain the possible damage of photosynthetic apparatus under stresses (Li et al 2009, Xue et al 2012.…”

Section: Discussionmentioning

confidence: 99%

Effects of irradiance on the photosynthetic traits, antioxidative enzymes, and growth of Cryptotaenia japonica

Liu¹,

Zhou²,

Wu³

et al. 2015

Biol. plant.

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Growth, photosynthetic characteristics, chlorophyll (Chl) fluorescence parameters, and peroxidation of membrane lipid of Cryptotaenia japonica were studied under differing irradiances (15, 35, 60, and 100 % of full irradiance). At full irradiance, C. japonica exhibited a typical decline in net photosynthetic rate (P N ) at midday, which was not observed in the other irradiance treatments. This indicates a possible photoinhibition for C. japonica at the high irradiance. Diurnal patterns of stomatal conductance (g s ) were remarkably similar to those of P N in each irradiance treatment, and the intercellular CO 2 concentration (c i ) had the opposite trend. C. japonica growing under 60 % of the full irradiance exhibited the highest plant height, stem diameter, leaf area, and biomass. The initial fluorescence (F 0 ) value was lowest at 60 % of the full irradiance. Maximal fluorescence (F m ), potential activity of photosystem II (PS II) (F v /F 0 ), and maximal photochemical efficiency of PS II (F v /F m ) values were highest at 60 % of full irradiance and lowest at 15 % of the full irradiance. The malondialdehyde (MDA) content in 15 % and 100 % of the full irradiance were higher than under the other irradiances. During the treatment, catalase, peroxidase, and superoxide dismutase activities firstly increased and then declined under 15 % and 100 % of the full irradiance and were steadily low under 60 % of the full irradiance, indicating a low production of reactive oxygen species. Therefore, C. japonica thrived best under 60 % of the full irradiance.

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Effects of temperature and irradiance on photosystem activity during Alhagi sparsifolia leaf senescence

Cited by 12 publications

References 17 publications

Sensitivity of Lichens to Diesel Exhaust under Laboratory Conditions

Sensitivity of Lichens to Diesel Exhaust under Laboratory Conditions

Impact of girdling and leaf removal on Alhagi sparsifolia leaf senescence

Effects of irradiance on the photosynthetic traits, antioxidative enzymes, and growth of Cryptotaenia japonica

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