scholarly journals Vascular Cambium Development

2015 ◽  
Vol 13 ◽  
pp. e0177 ◽  
Author(s):  
Kaisa Nieminen ◽  
Tiina Blomster ◽  
Ykä Helariutta ◽  
Ari Pekka Mähönen
Keyword(s):  
Vascular Cambium

scholarly journals Transcriptomic and epigenomic remodeling occurs during vascular cambium periodicity in Populus tomentosa

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Bo Chen ◽  
Huimin Xu ◽  
Yayu Guo ◽  
Paul Grünhofer ◽  
Lukas Schreiber ◽  
...  
Keyword(s):  
Signal Transduction ◽  
Plant Hormone ◽  
Target Genes ◽  
Populus Tomentosa ◽  
Differentially Expressed ◽  
Vascular Cambium ◽  
Differentially Methylated Region ◽  
Gene Body Methylation ◽  
Transcription Analysis ◽  
Global Methylation

AbstractTrees in temperate regions exhibit evident seasonal patterns, which play vital roles in their growth and development. The activity of cambial stem cells is the basis for regulating the quantity and quality of wood, which has received considerable attention. However, the underlying mechanisms of these processes have not been fully elucidated. Here we performed a comprehensive analysis of morphological observations, transcriptome profiles, the DNA methylome, and miRNAs of the cambium in Populus tomentosa during the transition from dormancy to activation. Anatomical analysis showed that the active cambial zone exhibited a significant increase in the width and number of cell layers compared with those of the dormant and reactivating cambium. Furthermore, we found that differentially expressed genes associated with vascular development were mainly involved in plant hormone signal transduction, cell division and expansion, and cell wall biosynthesis. In addition, we identified 235 known miRNAs and 125 novel miRNAs. Differentially expressed miRNAs and target genes showed stronger negative correlations than other miRNA/target pairs. Moreover, global methylation and transcription analysis revealed that CG gene body methylation was positively correlated with gene expression, whereas CHG exhibited the opposite trend in the downstream region. Most importantly, we observed that the number of CHH differentially methylated region (DMR) changes was the greatest during cambium periodicity. Intriguingly, the genes with hypomethylated CHH DMRs in the promoter were involved in plant hormone signal transduction, phenylpropanoid biosynthesis, and plant–pathogen interactions during vascular cambium development. These findings improve our systems-level understanding of the epigenomic diversity that exists in the annual growth cycle of trees.

scholarly journals Cambial Activity and Phenology in Three Understory Species along an Altitude Gradient in Mexico

Forests ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 506
Author(s):  
Mayte S. Jiménez-Noriega ◽  
Lauro López-Mata ◽  
Teresa Terrazas
Keyword(s):  
Soil Temperature ◽  
Sierra Nevada ◽  
Cambial Activity ◽  
Life Forms ◽  
Dry Season ◽  
Vascular Cambium ◽  
Phenological Stages ◽  
Altitude Gradient ◽  
The Mean ◽  
Trees And Shrubs

The aims of this study were to evaluate the cambial activity and phenology of three species with different life forms (Alchemilla procumbens, Acaena elongata and Ribes ciliatum) along an altitudinal gradient and to establish which environmental variables (light, soil humidity and temperature) had the greatest influence on cambial activity and phenological stages. Over two years, data on phenology, growth and cambium were gathered every four weeks in three to six sites per species in Sierra Nevada, Mexico. The results showed that Ribes is the only species that terminates cambial activity with leaves senescence and is influenced by the minimum soil temperature. The light environment influenced the vegetative stages in Alchemilla (cryptophyte), while in Acaena (hemicryptophyte), the mean soil temperature explained the findings related to leaf area during the dry season and growth along the gradient. In the three species, the reproductive phase dominated for a longer period at higher elevations, especially in Alchemilla. Only Ribes, the phanerophyte, showed a similar cambial activity to other trees and shrubs. Although cambium reactivates during the dry season, no xylogenesis occurs. The three species varied during the time in which vascular cambium was active, and this was dependent on the altitude. Specifically, the variation was more rhythmic in Ribes and switched on and off in Alchemilla. It is likely that, depending on the life form, vascular cambium may be more or less susceptible to one or more climate factors.

Age-dependent microRNAs in regulation of vascular cambium activity in Chinese fir (Cunninghamia lanceolata)

Trees ◽  
2021 ◽  
Author(s):  
Guijun Liu ◽  
Xian Xue ◽  
Jinling Feng ◽  
Dechang Cao ◽  
Jinxing Lin ◽  
...  
Keyword(s):  
Chinese Fir ◽  
Cunninghamia Lanceolata ◽  
Vascular Cambium ◽  
Age Dependent ◽  
Cambium Activity

scholarly journals How Do Trees Grow in Girth? Controversy on the Role of Cellular Events in the Vascular Cambium

2021 ◽  
Author(s):  
Anna Wilczek-Ponce ◽  
Wiesław Włoch ◽  
Muhammad Iqbal
Keyword(s):  
Woody Plants ◽  
Radial Growth ◽  
Apical Cell ◽  
Vascular Cambium ◽  
Cell Dynamics ◽  
Cellular Events ◽  
New Concepts ◽  
New Interpretation ◽  
Cambial Cells ◽  
Periclinal Walls

AbstractRadial growth has long been a subject of interest in tree biology research. Recent studies have brought a significant change in the understanding of some basic processes characteristic to the vascular cambium, a meristem that produces secondary vascular tissues (phloem and xylem) in woody plants. A new hypothesis regarding the mechanism of intrusive growth of the cambial initials, which has been ratified by studies of the arrangement of cambial cells, negates the influence of this apical cell growth on the expansion of the cambial circumference. Instead, it suggests that the tip of the elongating cambial initial intrudes between the tangential (periclinal) walls, rather than the radial (anticlinal) walls, of the initial(s) and its(their) derivative(s) lying ahead of the elongating cell tip. The new concept also explains the hitherto obscure mechanism of the cell event called ‘elimination of initials’. This article evaluates these new concepts of the cambial cell dynamics and offers a new interpretation for some curious events occurring in the cambial meristem in relation to the radial growth in woody plants.

Vascular cambium necrosis in forest fires: using hyperbolic temperature regimes to estimate parameters of a tissue-response model

2004 ◽  
Vol 52 (6) ◽  
pp. 757 ◽  
Author(s):  
M. B. Dickinson ◽  
J. Jolliff ◽  
A. S. Bova
Keyword(s):  
Pinus Ponderosa ◽  
Forest Fires ◽  
Ponderosa Pine ◽  
Process Model ◽  
Acer Rubrum ◽  
Tissue Response ◽  
Vascular Cambium ◽  
Red Maple ◽  
Fixed Temperature ◽  
Temperature Regimes

Hyperbolic temperature exposures (in which the rate of temperature rise increases with time) and an analytical solution to a rate-process model were used to characterise the impairment of respiration in samples containing both phloem (live bark) and vascular-cambium tissue during exposures to temperatures such as those experienced by the vascular cambium in tree stems heated by forest fires. Tissue impairment was characterised for red maple (Acer rubrum), chestnut oak (Quercus prinus), Douglas fir (Pseudotsuga menziesii), and ponderosa pine (Pinus ponderosa) samples. The estimated temperature dependence of the model’s rate parameter (described by the Arrhenius equation) was a function of the temperature regime to which tissues were exposed. Temperatures rising hyperbolically from near ambient (30°C) to 65°C produced rate parameters for the deciduous species that were similar at 60°C to those from the literature, estimated by using fixed temperature exposures. In contrast, samples from all species showed low rates of impairment, conifer samples more so than deciduous, after exposure to regimes in which temperatures rose hyperbolically between 50 and 60°C. A hypersensitive response could explain an early lag in tissue-impairment rates that apparently caused the differences among heating regimes. A simulation based on stem vascular-cambium temperature regimes measured during fires shows how temperature-dependent impairment rates can be used to predict tissue necrosis in fires. To our knowledge, hyperbolic temperature exposures have not been used to characterise plant tissue thermal tolerance and, given certain caveats, could provide more realistic data more efficiently than fixed-temperature exposures.

scholarly journals The parenchymo-vascular cambium and its derivative tissues in stems and roots of Bougainvillaea glabra Choisy (Nyctaginaceae)

2015 ◽  
Vol 42 (1) ◽  
pp. 41-61 ◽  
Author(s):  
Z. Puławska
Keyword(s):  
Periclinal Division ◽  
The Other ◽  
Vascular Cambium ◽  
Vascular Bundles ◽  
Cambial Cell ◽  
Other Hand ◽  
Anticlinal Division

In the shoots and roots of <i>Bougainmllaea</i>, the parenchymo-vascular cambium produces thinwalled secondary parenchyma to one side and the secondary vascular bundles embedded in the "conjunctive tissue" to the other. Periclinal division of a single cambial cell in one radial row brings about periclinal divisions of the adjacent cells of the neighbouring rows. Anticlinal division of a single cambial cell at one level, on the other hand, causes anticlinal. divisions of the adjacent cells of the overlying and underlying tiers.

Early ontogeny of vascular cambium III

1974 ◽  
Vol 87 (2) ◽  
pp. 99-112 ◽  
Author(s):  
Woong Young Soh
Keyword(s):  
Early Ontogeny ◽  
Vascular Cambium
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