scholarly journals Differential Leaf Age-Dependent Thermal Plasticity in the Keystone Seagrass Posidonia oceanica

2019 ◽  
Vol 10 ◽  
Author(s):  
Miriam Ruocco ◽  
Pasquale De Luca ◽  
Lázaro Marín-Guirao ◽  
Gabriele Procaccini
Keyword(s):  
Leaf Age ◽  
Posidonia Oceanica ◽  
Thermal Plasticity ◽  
Age Dependent

scholarly journals Leaf Age-Dependent Photoprotective and Antioxidative Response Mechanisms to Paraquat-Induced Oxidative Stress in Arabidopsis thaliana

2015 ◽  
Vol 16 (12) ◽  
pp. 13989-14006 ◽  
Author(s):  
Julietta Moustaka ◽  
Georgia Tanou ◽  
Ioannis-Dimosthenis Adamakis ◽  
Eleftherios Eleftheriou ◽  
Michael Moustakas
Keyword(s):  
Oxidative Stress ◽  
Arabidopsis Thaliana ◽  
Leaf Age ◽  
Antioxidative Response ◽  
Age Dependent

scholarly journals Size- and Leaf age-dependent Effects on the Photosynthetic Physiological Responses of Artemisia ordosica to Drought Stress

2020 ◽  
Author(s):  
chunyuan wang ◽  
Minghan Yu ◽  
Guodong Ding ◽  
Guanglei Gao ◽  
Linlin Zhang ◽  
...  
Keyword(s):  
Drought Stress ◽  
Physiological Responses ◽  
Leaf Age ◽  
Artemisia Ordosica ◽  
Age Dependent

scholarly journals A consensual Diving-PAM protocol to monitor Posidonia oceanica photosynthesis

2015 ◽  
Author(s):  
Sylvie Gobert ◽  
Gilles Lepoint ◽  
João Silva ◽  
Rui Santos ◽  
Pierre Lejeune ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Leaf Age ◽  
Cost Effective ◽  
Pulse Amplitude ◽  
Posidonia Oceanica ◽  
Plant Ecology ◽  
Middle Part ◽  
Fluorescence Measurements ◽  
Photosynthetic Responses ◽  
Leaf Part

The seagrass Posidonia oceanica is widely recognized as an effective bioindicator of the health status of Mediterranean coastal waters. Chlorophyll fluorescence measurements, in particular through the Pulse Amplitude Modulated (PAM) fluorometry method, are performed to study aquatic plant ecology and vitality and to assess their responses to diverse stressful factors. However, the current understanding of P. oceanica photosynthetic responses to environmental stresses does only allow scientists to use the PAM-method as a complementary tool to other more-robust monitoring techniques. Consequently, a more in-depth knowledge of the natural causes of variability of P. oceanica photosynthetic responses are a prerequisite to any surveys relying on that time and cost-effective method. In the framework of the STARECAPMED project, this work aimed to determine the influence of several environmental (depth, daytime, season) and plant-specific characteristics (leaf age, leaf part analyzed, epiphytic coverage) on the photosynthetic responses (Y, ETR, RLC) of P. oceanica. Water temperature, irradiance and several biochemical parameters of the seagrass (chl.a, chl.b, C, N, P, micronutrients such as Fe, Cu) were measured as well. The field survey was performed in a pristine meadow in the Calvi Bay, Corsica. Environmental and plant-physiological characteristics deeply influenced P. oceanica photosynthetic responses. As an example, ETR decreased with depth, contrary to Y that mostly increased. ETR was lower in the basal part of leaf blade, and the epiphytic coverage of leaf tips slightly increased their ETR compared to leaf tips cleaned of epiphytes. Depth and leaf part-related variations in RLC were also observed. Because of this natural variability, it appears essential to develop a consensual protocol of chlorophyll fluorescence measurements to publish reliable and comparable results between studies. We therefore notably suggest to perform measurements close to midday, when photosynthetic responses are the highest; at 10-15 m depth in order to avoid, among others, low depth light irradiance variability; on the middle part of the 3rd-4th external leaf, well developed, highly photosynthetic, and little epiphyted. Finally, because P. oceanica fluorescence was correlated with N, P and chl.b leaf contents, the PAM-method could afterwards be used as bioindicator technique, according to the protocol proposed.

scholarly journals Combinatory actions of CP29 phosphorylation by STN7 and stability regulate leaf age-dependent disassembly of photosynthetic complexes

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Roshan Sharma Poudyal ◽  
Margarita V. Rodionova ◽  
Hyunmin Kim ◽  
Seongsin Lee ◽  
Eunjeong Do ◽  
...  
Keyword(s):  
Leaf Age ◽  
Age Dependent ◽  
Photosynthetic Complexes

scholarly journals On the Capability of the Epigeous Organs of Phragmites australis to Act as Metal Accumulators in Biomonitoring Studies

2021 ◽  
Vol 13 (14) ◽  
pp. 7745
Author(s):  
Daniela Baldantoni ◽  
Alessandro Bellino
Keyword(s):  
Phragmites Australis ◽  
Littoral Zone ◽  
Metal Accumulation ◽  
Leaf Age ◽  
Common Reed ◽  
Volcanic Lake ◽  
Whole Plant ◽  
Age Dependent ◽  
Young Leaves ◽  
Plant Exposure

With a view of shedding light on the accumulation capability of the epigeous organs of common reed (Phragmites australis), employed worldwide in metal biomonitoring, an accumulation study of Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn was performed, focusing on leaves belonging to different whorls and culms. To this end, in five sampling sites on the littoral zone of the volcanic Lake Averno (Italy), and in one occasion (autumn) before plant senescence, leaves of different ages and culms were collected and analyzed for metal concentrations. In terms of the suitability for biomonitoring, culms demonstrated poor performances in relation to the low metal accumulation and the difficulties in sampling and processing, whereas leaves proved their effectiveness in highlighting whole plant exposure. Since the accumulation degree of Cr, Cu, Fe and Zn is unaffected by leaf age, the pooling of leaves from different whorls is advisable to improve the representativeness of samplings. This strategy becomes mandatory in the case of Ni, the non-monotonic age-dependent variations of which would affect the derivation of contamination gradients otherwise. For Mn, Cd and Pb, the accumulation patterns strictly dependent on age can instead be exploited in selecting the sensitivity of biomonitoring by focusing on the organs where they are preferentially accumulated: old leaves for Mn and young leaves for Cd and Pb.

Size- and leaf age-dependent effects on the photosynthetic and physiological responses of Artemisia ordosica to drought stress

2021 ◽  
Vol 13 (7) ◽  
pp. 744-758
Author(s):  
Chunyuan Wang ◽  
Minghan Yu ◽  
Guodong Ding ◽  
Guanglei Gao ◽  
Linlin Zhang ◽  
...  
Keyword(s):  
Drought Stress ◽  
Physiological Responses ◽  
Leaf Age ◽  
Artemisia Ordosica ◽  
Age Dependent

scholarly journals A consensual Diving-PAM protocol to monitor Posidonia oceanica photosynthesis

2015 ◽  
Author(s):  
Sylvie Gobert ◽  
Gilles Lepoint ◽  
João Silva ◽  
Rui Santos ◽  
Pierre Lejeune ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Leaf Age ◽  
Cost Effective ◽  
Pulse Amplitude ◽  
Posidonia Oceanica ◽  
Plant Ecology ◽  
Middle Part ◽  
Fluorescence Measurements ◽  
Photosynthetic Responses ◽  
Leaf Part

The seagrass Posidonia oceanica is widely recognized as an effective bioindicator of the health status of Mediterranean coastal waters. Chlorophyll fluorescence measurements, in particular through the Pulse Amplitude Modulated (PAM) fluorometry method, are performed to study aquatic plant ecology and vitality and to assess their responses to diverse stressful factors. However, the current understanding of P. oceanica photosynthetic responses to environmental stresses does only allow scientists to use the PAM-method as a complementary tool to other more-robust monitoring techniques. Consequently, a more in-depth knowledge of the natural causes of variability of P. oceanica photosynthetic responses are a prerequisite to any surveys relying on that time and cost-effective method. In the framework of the STARECAPMED project, this work aimed to determine the influence of several environmental (depth, daytime, season) and plant-specific characteristics (leaf age, leaf part analyzed, epiphytic coverage) on the photosynthetic responses (Y, ETR, RLC) of P. oceanica. Water temperature, irradiance and several biochemical parameters of the seagrass (chl.a, chl.b, C, N, P, micronutrients such as Fe, Cu) were measured as well. The field survey was performed in a pristine meadow in the Calvi Bay, Corsica. Environmental and plant-physiological characteristics deeply influenced P. oceanica photosynthetic responses. As an example, ETR decreased with depth, contrary to Y that mostly increased. ETR was lower in the basal part of leaf blade, and the epiphytic coverage of leaf tips slightly increased their ETR compared to leaf tips cleaned of epiphytes. Depth and leaf part-related variations in RLC were also observed. Because of this natural variability, it appears essential to develop a consensual protocol of chlorophyll fluorescence measurements to publish reliable and comparable results between studies. We therefore notably suggest to perform measurements close to midday, when photosynthetic responses are the highest; at 10-15 m depth in order to avoid, among others, low depth light irradiance variability; on the middle part of the 3rd-4th external leaf, well developed, highly photosynthetic, and little epiphyted. Finally, because P. oceanica fluorescence was correlated with N, P and chl.b leaf contents, the PAM-method could afterwards be used as bioindicator technique, according to the protocol proposed.

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