scholarly journals Non-Structural Carbohydrate Storage Strategy Explains the Spatial Distribution of Treeline Species

Plants ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 384
Author(s):  
Hudong Han ◽  
Hongshi He ◽  
Zhengfang Wu ◽  
Yu Cong ◽  
Shengwei Zong ◽  
...  
Keyword(s):  
Fine Roots ◽  
Environmental Changes ◽  
Soluble Sugars ◽  
Picea Jezoensis ◽  
Starch Concentration ◽  
Alpine Treeline ◽  
Structural Carbohydrate ◽  
One Year ◽  
And Shifts ◽  
High Level

Environmental factors that drive carbon storage are often used as an explanation for alpine treeline formation. However, different tree species respond differently to environmental changes, which challenges our understanding of treeline formation and shifts. Therefore, we selected Picea jezoensis and Betula ermanii, the two treeline species naturally occurring in Changbai Mountain in China, and measured the concentration of non-structural carbohydrates (NSC), soluble sugars and starch in one-year-old leaves, shoots, stems and fine roots at different elevations. We found that compared with P. jezoensis, the NSC and soluble sugars concentrations of leaves and shoots of B. ermanii were higher than those of P. jezoensis, while the starch concentration of all the tissues were lower. Moreover, the concentration of NSC, soluble sugars and starch in the leaves of B. ermanii decreased with elevation. In addition, the starch concentration of B. ermanii shoots, stems and fine roots remained at a high level regardless of whether the soluble sugars concentration decreased. Whereas the concentrations of soluble sugars and starch in one-year-old leaves, shoots and stems of P. jezoensis responded similarly changes with elevation. These findings demonstrate that compared with P. jezoensis, B. ermanii has a higher soluble sugars/starch ratio, and its shoots, stems and fine roots actively store NSC to adapt to the harsh environment, which is one of the reasons that B. ermanii can be distributed at higher altitudes.

Defoliation frequency and the response by white clover to increasing phosphorus supply 2. Non-structural carbohydrate concentrations in plant parts

1997 ◽  
Vol 48 (1) ◽  
pp. 119 ◽  
Author(s):  
D. K. Singh ◽  
P. W. G. Sale
Keyword(s):  
White Clover ◽  
Soluble Sugars ◽  
Dry Weight ◽  
Starch Concentration ◽  
Plant Parts ◽  
Carbohydrate Concentration ◽  
Structural Carbohydrate ◽  
Defoliation Frequency ◽  
The Relationship ◽  
P Supply

The concentrations of total non-structural carbohydrate (%TNC) and its various forms (soluble sugars and starch) were measured in white clover plants that were grown in a glasshouse with different levels of P supply (0, 30, 90, and 180 mg/pot) and subjected to 3 defoliation frequencies (1, 2, and 4 defoliations over 36 days). Frequent defoliation reduced %TNC. Increasing P supply to the clover plants had the opposite effect, but to a lesser extent, and tended to reverse the decline in %TNC resulting from frequent defoliation. Stolons were the plant parts where most of the non-structural carbohydrate reserves were stored, with concentrations varying from <2 to >11% TNC on a dry weight basis, according to the treatment received. Minimal changes occurred in the %TNC for the leaves or roots as a result of treatments. The fluctuations in non-structural carbohydrate concentration in the stolons were mainly due to changes in the starch concentration, since the stolon sugar concentration was relatively constant between various treatments. A logistic curve closely defined the relationship (r2 = 0·98) between the starch concentration in the stolons and dry matter yield of leaves, suggesting that stolon starch reserves are a function of the size of the leaf canopy. Canopy size, in turn, was dependent on the duration of the regrowth period and, to a lesser extent, on the P supply. The maximum starch concentration in the stolons was around 8% under the conditions of this experiment.

scholarly journals Carbon and nutrient physiology in shrubs at the upper limits: a multi-species study

2020 ◽  
Author(s):  
Xue Wang ◽  
Fei-Hai Yu ◽  
Yong Jiang ◽  
Mai-He Li
Keyword(s):  
Fine Roots ◽  
Soluble Sugar ◽  
Soluble Sugars ◽  
Growing Season ◽  
Interactive Effects ◽  
Tree Line ◽  
Shrub Species ◽  
Nutrient Physiology ◽  
Upper Limits ◽  
Species Study

Abstract Aims Carbon and nutrient physiology of trees at their upper limits have been extensively studied, but those of shrubs at their upper limits have received much less attention. The aim of this study is to examine the general patterns of non-structural carbohydrates (NSCs), nitrogen (N) and phosphorous (P) in shrubs at the upper limits, and to assess whether such patterns are similar to those in trees at the upper limits. Methods Across Eurasia, we measured the concentrations of soluble sugars, starch, total NSCs, N and P in leaves, branches and fine roots (&lt; 0.5 cm in diameter) of five shrub species growing at both the upper limits and lower elevations in both summer (peak growing season) and winter (dormancy season). Important Findings Neither elevation nor season had significant effects on tissue N and P concentrations, except for lower P concentrations in fine roots in winter than in summer. Total NSCs and soluble sugars in branches were significantly higher in winter than in summer. There were significant interactive effects between elevation and season for total NSCs, starch, soluble sugars and the ratio of soluble sugar to starch in fine roots, showing lower soluble sugars and starch in fine roots at the upper limits than at the lower elevations in winter but not in summer. These results suggest that the carbon physiology of roots in winter may play an important role in determining the upward distribution of shrubs, like that in the alpine tree-line trees.

Determinants of Budget Deficit in Nigeria

2021 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Maimuna M Shehu ◽  
Ibrahim M Adamu
Keyword(s):  
Budget Deficit ◽  
Budget Deficits ◽  
Cointegrating Vector ◽  
Long Run ◽  
Johansen Cointegration ◽  
Short Run ◽  
Johansen Cointegration Test ◽  
The Government ◽  
One Year ◽  
High Level

This paper investigates the factors governing the determination of budget deficit in Nigeria from 1981q1 through 2016q4. Our methodology is based on Johansen cointegration and Vector Error Correction model (VECM) approach. The result from the Johansen cointegration test suggests one cointegrating vector, which indicates the existence of a long run cointegrating relationship. Evidence from the long run and short run parameters suggest that exchange rate, interest rate and one year lag of budget deficit are the major determinants of budget deficit. Therefore, to achieve a realistic fiscal surplus, the government should determine a high level of accountability in its fiscal operations. In addition, any fiscal surplus should be channeled into productive investments to diversify the economy and reduce the likelihood of potential budget deficits.

scholarly journals Invertase and sucrose synthase activities in coffee plants sprayed with sucrose solution

2003 ◽  
Vol 60 (2) ◽  
pp. 239-244 ◽  
Author(s):  
José Carlos da Silva ◽  
José Donizeti Alves ◽  
Amauri Alves de Alvarenga ◽  
Marcelo Murad Magalhães ◽  
Dárlan Einstein do Livramento ◽  
...  
Keyword(s):  
Sucrose Synthase ◽  
Sucrose Solution ◽  
Management Practice ◽  
Physiological State ◽  
Soluble Sugar ◽  
Soluble Sugars ◽  
Total Soluble Sugar ◽  
Coffee Plants ◽  
Sugar Levels ◽  
High Level

One management practice of which the efficiency has not yet been scientifically tested is spraying coffee plants with diluted sucrose solutions as a source of carbon for the plant. This paper evaluates the effect of foliar spraying with sugar on the endogenous level of carbohydrates and on the activities of invertase and sucrose synthase in coffee (Coffea arabica L.) seedlings with reduced (low) and high (normal) levels of carbon reserve. The concentrations used were 0.5 and 1.0% sucrose, and water as a control. The use of sucrose at 1.0% caused an increase in the concentration of total soluble sugars in depauperate plants, as well as increased the activity of the following enzymes: cell wall and vacuole acid invertase, neutral cytosol invertase and sucrose synthase. In plants with high level of carbon reserve, no increments in total soluble sugar levels or in enzymatic activity were observed. Regardless of treatments or plants physiological state, no differences in transpiration or stomatal conductance were observed, demonstrating the stomatal control of transpiration. Photosynthesis was stimulated with the use of 0.5 and 1.0 % sucrose only in depauperate plants. Coffee seedling spraying with sucrose is only efficient for depauperate plants, at the concentration of 1.0%.

scholarly journals Cold induced changes on sugar contents and respiratory enzyme activities in coffee genotypes

2010 ◽  
Vol 40 (4) ◽  
pp. 781-786 ◽  
Author(s):  
Fábio Luiz Partelli ◽  
Henrique Duarte Vieira ◽  
Ana Paula Dias Rodrigues ◽  
Isabel Pais ◽  
Eliemar Campostrini ◽  
...  
Keyword(s):  
Soluble Sugar ◽  
Recovery Period ◽  
Soluble Sugars ◽  
Coffea Canephora ◽  
Correct Selection ◽  
Respiratory Enzymes ◽  
Period 2 ◽  
Acclimation Period ◽  
Cold Sensitive ◽  
One Year

The present research aimed to characterize some biochemical responses of Coffea canephora (clones 02 and 153) and C. arabica (Catucaí IPR 102) genotypes subjected to low positive temperatures, helping to elucidate the mechanisms involved in cold tolerance. For that, one year old plants were subjected successively to 1) a temperature decrease (0.5°C a day) from 25/20°C to 13/8°C (acclimation period), 2) a three day chilling cycle (3x13/4°C) and to 3) a recovery period of 14 days (25/20°C). In Catucaí (less cold sensitive when compared to clone 02) there was an increased activity in the respiratory enzymes malate dehydrogenase and pyruvate kinase. Furthermore, Catucaí showed significant increases along the cold imposition and the higher absolute values after chilling exposure of the soluble sugars (sucrose, glucose, fructose, raffinose, arabinose and mannitol) that are frequently involved in osmoregulation and membrane stabilization/protection. The analysis of respiratory enzymes and of soluble sugar balance may give valuable information about the cold acclimation/tolerance mechanisms, contributing to a correct selection and breeding of Coffea sp. genotypes.

scholarly journals Citrullinemia Type I - A Case Report

2016 ◽  
Vol 33 (2) ◽  
pp. 98-100
Author(s):  
Fauzia Mohsin ◽  
Sharmin Mahbuba ◽  
Tahmina Begum ◽  
Narayan Chandra Saha ◽  
Kishwar Azad ◽  
...  
Keyword(s):  
Urea Cycle ◽  
Female Child ◽  
Amino Acid Profile ◽  
Dramatic Improvement ◽  
Type I ◽  
Frequent Vomiting ◽  
Cycle Disorders ◽  
One Year ◽  
High Level ◽  
Citrullinemia Type I

Citrullinemia type I (CTLN1) is an inherited urea cycle disorder where the enzyme argininosuccinate synthetase is deficient. It can lead to recurrent hyperammonemic crisis that may result in permanent neurological sequelae, even death. Vomiting in patients with urea cycle disorders may either be the result or cause of acute hyperammonemia, particularly if due to an illness that leads to catabolism. Therefore, age-appropriate common etiologies of vomiting must be considered when evaluating these patients. We present a case of a 2 year 5 month old female child with CTLN1 who had a history of frequent vomiting after the age of one year and some recent neurological manifestations like excessive crying and lethargy and one episode of unconsciousness. Investigations revealed high level of ammonia. Amino acid profile using tandem mass spectrometry showed markedly increased plasma level of citrulline. After administration of sodium benzoate and protein restricted diet there was dramatic improvement of all the symptoms.J Bangladesh Coll Phys Surg 2015; 33(2): 98-100

scholarly journals GRAIN FROM MEDJYBIZH

2019 ◽  
Vol 32 (3) ◽  
pp. 176-183
Author(s):  
S. A. Gorbanenko ◽  
Yu. I. Tolkachov
Keyword(s):  
Eleventh Century ◽  
Winter Rye ◽  
Claviceps Purpurea ◽  
Archaeological Research ◽  
Arable Fields ◽  
Winter Crops ◽  
One Year ◽  
High Level ◽  
Brome Grass ◽  
Brome Grasses

During the archaeological research of the Medjybizh fortress (fig. 1), palaeoethnobotanical materials were found three times in its yard: in 1991, 2013 and 2015. The first definition was made by G. O. Pashkevich. Mostly rye was identified as well as bromus, sorrel and an ergot fungus claviceps purpurea. From materials ща 2015 about 30 ml of grain were provided, mostly rye, which is approximately 1800—2000 grains. This is a sample of the harvest of one year. Single kernels of hulled barley (5); emmer (2) and soft wheat (1) were identified. Weeds are represented by 3 species, they are convolvulus (19), brome grasses (11) and cleavers (7) (figs. 2—4). Identified weeds are concomitant for cultivated cereals and real anthropochores; they may be useful for therapeutic purposes. Brome grass is a winter plant that pollutes crops of winter rye and wheat. Fields pollution indicates a use of old arable fields: the population lived in this place continuously from the eleventh century. Consequently, the fields exploded about 2—3 centuries. Winter crops also show the use of old arable fields. According to the aggregate of weeds, these fields were located on high places with droughty soils. According to the analysis of topography and soil, these fields were in the western sector on the elevated plateau (supposedly the places of Dolzhok and Pereimska Dacha). Find of the rye also indirectly indicates a high level of development of agriculture. While plowing tools from Medzhybizh are unknown, we should assume the use of plow, which is the most progressive form of them.

scholarly journals Does the Mixture of Species change the C:N:P Ecological Stoichiometric Characteristics of fine Roots? A Case Study of Cupressus Funebris Mixed Forest

2021 ◽  
Author(s):  
Wenchun He ◽  
Yang Wang ◽  
Xiaochen Wen ◽  
Yu Wang ◽  
Baoru Xiao ◽  
...  
Keyword(s):  
Fine Roots ◽  
Environmental Changes ◽  
Mixed Forest ◽  
Chemical Properties ◽  
Available Phosphorus ◽  
Biological Factors ◽  
Nitrogen And Phosphorus ◽  
Mixed Stands ◽  
Available Nitrogen ◽  
Low Efficiency

Abstract The growth of fine roots of trees is affected by environmental changes and biological factors. At present, there have been many researches on the physiological plasticity of fine roots caused by environmental changes, but there are still few studies on the influence of biological factors on fine roots. This paper focused on the contents of carbon (C), nitrogen (N), and phosphorus (P), and their ecological stoichiometric ratios in different root orders of Cupressus funebris fine roots in 11 mixed stands with Koelreuteria paniculate or Toona sinensis at different ratios, and the effects of soil physical and chemical properties on the root chemical properties. It aimed to provide new insights into the fine-root nutrient distribution pattern and the transformation or reconstruction of low-efficiency pure forests from the standpoint of forest types. The results showed that: soil pH, and the content of available nitrogen (SAN), available phosphorus (SAP) and available potassium (SAK) differed significantly in the tested mixed forest stands. No significant differences in carbon content of fine roots were observed in different mixed stands. The content of nitrogen and phosphorus in fine roots in mixed forests showed heterogeneity. Species mixing changed the C/N, C/P and N/P of the C. funebris compared the pure stands. The "T. sinensis + C. funebris" forest alleviated the limitation of the lack of phosphorus on fine roots of C. funebris on. The principal component analysis showed that mixed stands of "T. sinensis + C. funebris" had the highest comprehensive score at ratio of "3:1". Thus, our results recommended the adoption of T. sinensis, especially at 75%, to reconstruct the low-efficiency pure C. funebris forest.

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