scholarly journals Nitrogen sources for current-year shoot growth in 50-year-old sessile oak trees: an in situ 15N labeling approach

2011 ◽  
Vol 31 (12) ◽  
pp. 1390-1400 ◽  
Author(s):  
R. El Zein ◽  
N. Breda ◽  
D. Gerant ◽  
B. Zeller ◽  
P. Maillard
Keyword(s):  
Shoot Growth ◽  
Nitrogen Sources ◽  
Sessile Oak ◽  
Oak Trees ◽  
15N Labeling ◽  
Labeling Approach

Microbial processes responsible for soil N2O production in a tropical rainforest, illustrated using an in situ 15N labeling approach

CATENA ◽  
2021 ◽  
Vol 202 ◽  
pp. 105214
Author(s):  
Wenjun Zhou ◽  
Dan Xi ◽  
Yunting Fang ◽  
Ang Wang ◽  
Liqing Sha ◽  
...  
Keyword(s):  
Tropical Rainforest ◽  
Microbial Processes ◽  
N2o Production ◽  
15N Labeling ◽  
Labeling Approach

Influence de la densité du couvert forestier sur le développement architectural de jeunes chênes sessiles, Quercus petraea (Matt.) Liebl. (Fagaceae), en régénération forestière

2000 ◽  
Vol 78 (12) ◽  
pp. 1531-1544 ◽  
Author(s):  
Eric Nicolini ◽  
Daniel Barthélémy ◽  
Patrick Heuret
Keyword(s):  
Quercus Petraea ◽  
Growth Unit ◽  
Growth Morphology ◽  
Basal Diameter ◽  
Canopy Density ◽  
Sessile Oak ◽  
The North ◽  
Oak Trees ◽  
Branching Patterns ◽  
Number Of Branches

The growth and branching patterns of the main axis of 6-year-old sessile oak, growing in a natural regeneration in the north of France, were analysed each year retrospectively according to three increasing canopy density conditions: large gap, small gap, and dense canopy. Increasing gap size is associated with an increase in the total height, basal diameter, branching probability, and global polycyclism rate of the trees. At the growth unit or annual shoot level, from dense canopy to large gaps these botanical entities also show an increase in their total length, number of nodes, polycyclism, and branching rate as well as mean number of branches and mean internode length. A discussion of our results revealed some endogenous features of growth and branching patterns in young sessile oak trees. It is also shown that increasing canopy density generally tends to reduce the expression of the endogenous architectural sequence of differentiation of young sessile oak trees. Young trees growing below dense canopy thus seem to be "delayed" in their sequence of differentiation and appear to be in a "waiting" status, whereas young trees growing in large gaps exhibit an architecture very similar to trees growing in nurseries under nonlimiting growth conditions.Key words: architecture, Quercus petraea, growth, morphology, canopy density.

scholarly journals Drought or Severe Drought? Hemiparasitic Yellow Mistletoe (Loranthus europaeus) Amplifies Drought Stress in Sessile Oak Trees (Quercus petraea) by Altering Water Status and Physiological Responses

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2985
Author(s):  
Martin Kubov ◽  
Peter Fleischer ◽  
Jozef Rozkošný ◽  
Daniel Kurjak ◽  
Alena Konôpková ◽  
...  
Keyword(s):  
Water Status ◽  
Leaf Size ◽  
Quercus Petraea ◽  
Severe Drought ◽  
Sessile Oak ◽  
Leaf Transpiration ◽  
Oak Trees ◽  
Psii Photochemistry ◽  
Use Efficiency ◽  
Stem Increment

European oak species have long been considered relatively resistant to different disturbances, including drought. However, several recent studies have reported their decline initiated by complex changes. Therefore, we compared mature sessile oak trees (Quercus petraea (Matt.), Liebl.) infested versus non-infested by hemiparasitic yellow mistletoe (Loranthus europaeus Jacq.) during the relatively dry vegetation season of 2019. We used broad arrays of ecophysiological (maximal assimilation rate Asat, chlorophyll a fluorescence, stomatal conductance gS, leaf morphological traits, mineral nutrition), growth (tree diameter, height, stem increment), and water status indicators (leaf water potential Ψ, leaf transpiration T, water-use efficiency WUE) to identify processes underlying vast oak decline. The presence of mistletoe significantly reduced the Ψ by 1 MPa, and the WUE by 14%. The T and gS of infested oaks were lower by 34% and 38%, respectively, compared to the non-infested oaks, whereas the Asat dropped to 55%. Less pronounced but significant changes were also observed at the level of photosystem II (PSII) photochemistry. Moreover, we identified the differences in C content, which probably reduced stem increment and leaf size of the infested trees. Generally, we can conclude that mistletoe could be a serious threat that jeopardizes the water status and growth of oak stands.

The allocation of assimilated carbon to shoot growth: in situ assessment in natural grasslands reveals nitrogen effects and interspecific differences

Oecologia ◽  
2013 ◽  
Vol 174 (4) ◽  
pp. 1085-1095 ◽  
Author(s):  
Xiao Ying Gong ◽  
Germán Darío Berone ◽  
Mónica Graciela Agnusdei ◽  
Ricardo Manuel Rodríguez Palma ◽  
Rudi Schäufele ◽  
...  
Keyword(s):  
Shoot Growth ◽  
Interspecific Differences ◽  
Natural Grasslands ◽  
In Situ Assessment

Generation of azaarene nitrile oxides from methyl azaarenes and t-BuONO enabling synthesis of furoxans and 1,2,4-oxadiazoles

2022 ◽  
Author(s):  
Xiang-Jin Zhang ◽  
Jian-Kang Cao ◽  
Jun-Jie Ren ◽  
Lin Hong ◽  
Ru-Jin Liang ◽  
...  
Keyword(s):  
High Efficiency ◽  
Nitrogen Sources ◽  
Nitrile Oxides ◽  
Tert Butyl

A high-efficiency strategy for the synthesis of furoxans and 1,2,4-oxadiazoles has been developed, utilizing tert-butyl nitrite (TBN) as nitrogen sources. Azaarene nitrile oxides as activated intermediates were generated in-situ via...

scholarly journals An in situ ascorbate peroxidase labeling in secreted exosomes identifies a stress-induced exosome proteome alteration

2021 ◽  
Author(s):  
Byung Rho Lee ◽  
Tae Jin Lee ◽  
Sekyung Oh ◽  
Chenglong Li ◽  
Jin-Hyuk Song ◽  
...  
Keyword(s):  
Ribosomal Proteins ◽  
Extracellular Vesicle ◽  
Mass Spectrometry Analysis ◽  
Biological Processes ◽  
Ribonucleic Acids ◽  
Spectrometry Analysis ◽  
Exosome Biogenesis ◽  
Cargo Protein ◽  
Labeling Approach

Abstract The extracellular vesicle exosome mediates intercellular communication by transporting macromolecules such as proteins and ribonucleic acids. Determining cargo content with high accuracy will help decipher the biological processes that exosomes mediate in various contexts. Existing methods for probing exosome cargo molecules rely on a prior exosome isolation procedure. Here we report an in situ labeling approach for exosome proteome profiling, termed Exosome-Proxy APEX Labeling (EPAL), which bypasses the exosome isolation steps. In EPAL, proteins either in the exosome biogenesis vesicles in cells or in secreted exosomes in the conditioned medium can specifically be biotinylated with expressing a variant of the engineered ascorbic peroxidase APEX that is fused to an exosome cargo protein such as CD63. Mass spectrometry analysis of the proteins biotinylated in exosomes secreted from kidney proximal tubule-derived cells reveals that oxidative stress can induce an alteration in exosome protein contents, including accumulation of ribosomal proteins in exosomes.

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