The Relationship between Insect Resistance and Tree Age of Transgenic Triploid Populus tomentosa Plants

The presence of wound (strain) initiated discoloured wood columns in the core of sugar maple (Acer saccharum Marshall) stems reduces the proportion of white-coloured wood and, thus, lowers its commercial value. This study aimed to assess the relationship between tree characteristics and the extent and proportion of discoloured wood in sugar maple tree stems. Using 109 trees from three different sites in southern Quebec, we found that the proportion of discoloured wood increased with decreasing sapwood volume and increasing tree age. Younger trees showed a significantly lower proportion of discoloured wood volume. Discoloured wood volume increases disproportionately with tree diameter, while varying among sites. The third important factor affecting the amount of discolored wood was tree vigour as measured by crown characteristics and growth rate changes. A nonlinear mixed-effects model was used to predict discoloured wood taper. Height along the stem was used as a predictor, along with diameter at 1.3 m (DBH), the ratio of live crown length to tree height, and tree height. Although observed injury surface area was positively correlated to discoloured wood volume, injury information did not explain a large share of discoloured wood proportion variation. Overall, older and larger trees with many injuries on less productive sites are likely to have more discoloured wood.

Download Full-text

Influences of Laccase Mediator System on Bleachability and Fiber Properties of APMP Pulp

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1081.299 ◽

2014 ◽

Vol 1081 ◽

pp. 299-303

Author(s):

Hui Mei Wang ◽

Yu Liu ◽

Jia Chuan Chen ◽

Zhen Wang

Keyword(s):

Hydrogen Peroxide ◽

Populus Tomentosa ◽

Fiber Morphology ◽

Alkaline Hydrogen Peroxide ◽

Obvious Effect ◽

Peroxide Bleaching ◽

Fiber Properties ◽

Mediator System ◽

Laccase Mediator System ◽

Triploid Populus Tomentosa

In this research, the laccase mediator system (LMS) was used to modify the unbleached triploid populus tomentosa alkaline hydrogen peroxide pulp (APMP). The changes of pulp brightness were measured and the effects of LMS on the subsequent hydrogen peroxide bleaching were also determined. Besides, the fiber morphology was analyzed by ESEM, and then the obvious changes of pulp have been recovered. In a word, the LMS has obvious effect on cellulose.

Download Full-text

Characteristics of fine root system and water uptake in a triploid Populus tomentosa plantation in the North China Plain: Implications for irrigation water management

Agricultural Water Management ◽

10.1016/j.agwat.2012.11.006 ◽

2013 ◽

Vol 117 ◽

pp. 83-92 ◽

Cited By ~ 31

Author(s):

Benye Xi ◽

Ye Wang ◽

Liming Jia ◽

Mark Bloomberg ◽

Guangde Li ◽

...

Keyword(s):

Water Management ◽

Irrigation Water ◽

North China Plain ◽

North China ◽

Fine Root ◽

Populus Tomentosa ◽

Irrigation Water Management ◽

The North ◽

The North China Plain ◽

Triploid Populus Tomentosa

Download Full-text

Antioxidative low molecular weight extractives from triploid Populus tomentosa xylem

BioResources ◽

10.15376/biores.6.1.232-242 ◽

2010 ◽

Vol 6 (1) ◽

pp. 232-242

Author(s):

Chuan-Ling Si ◽

Yi-Yuan Lu ◽

Yu Zhang ◽

Jie Xu ◽

Pan-Pan Qin ◽

...

Keyword(s):

Molecular Weight ◽

Paper Industry ◽

Radical Scavenging ◽

Good Alternative ◽

Populus Tomentosa ◽

Low Molecular Weight ◽

Phytochemical Investigation ◽

Populus Tomentosa Carr ◽

Triploid Populus Tomentosa ◽

Bioactive Potential

Triploid Populus tomentosa Carr. (Salicaceae) is a good alternative to meet the increasing need of the global pulp and paper industry. Meanwhile, the xylem of this species could be a useful bioresource to develop low molecular extractives with significant bioactive potential. In the present work, a phytochemical investigation on aqueous EtOH extractives of Triploid P. tomentosa xylem, by systematical performance of Sephadex LH-20 open column chromatography and Thin Layer Chromatography (TLC), resulted in the isolation of two phenolic acids (ρ-coumaric acid (I) and caffeic acid (II)), two flavonoids (apigenin (III) and luteolin (IV)), and three phenolic glucosides (salicortin (V), salireposide (VI) and populoside (VII)). The structure elucidation and determination of the isolated extractives were based on their spectroscopical data and physiochemical evidences. This was the first time to report the low molecular weight extractives of Triploid P. tomentosa. Various low molecular weight extractives fromTriploid P. tomentosa xylem exhibited significant antioxidative activities by DPPH and hydroxyl radical scavenging assays.

Download Full-text

Transcriptome analysis of diploid and triploid Populus tomentosa

PeerJ ◽

10.7717/peerj.10204 ◽

2020 ◽

Vol 8 ◽

pp. e10204

Author(s):

Wen Bian ◽

Xiaozhen Liu ◽

Zhiming Zhang ◽

Hanyao Zhang

Keyword(s):

Transcriptome Sequencing ◽

Carbon Fixation ◽

Wood Quality ◽

Populus Tomentosa ◽

Plant Materials ◽

Young Tree ◽

Mapk Signalling Pathway ◽

Expression Of Genes ◽

Phenylpropanoid Biosynthesis ◽

Triploid Populus Tomentosa

Triploid Chinese white poplar (Populus tomentosa Carr., Salicaceae) has stronger advantages in growth and better stress resistance and wood quality than diploid P. tomentosa. Using transcriptome sequencing technology to identify candidate transcriptome-based markers for growth vigor in young tree tissue is of great significance for the breeding of P. tomentosa varieties in the future. In this study, the cuttings of diploid and triploid P. tomentosa were used as plant materials, transcriptome sequencing was carried out, and their tissue culture materials were used for RT-qPCR verification of the expression of genes. The results showed that 12,240 differentially expressed genes in diploid and triploid P. tomentosa transcripts were annotated and enriched into 135 metabolic pathways. The top six pathways that enriched the most significantly different genes were plant-pathogen interaction, phenylpropanoid biosynthesis, MAPK signalling pathway-plant, ascorbate and aldarate metabolism, diterpenoid biosynthesis, and the betalain biosynthesis pathway. Ten growth-related genes were selected from pathways of plant hormone signal transduction and carbon fixation in photosynthetic organisms for RT-qPCR verification. The expression levels of MDH and CYCD3 in tissue-cultured and greenhouse planted triploid P. tomentosa were higher than those in tissue-cultured diploid P. tomentosa, which was consist ent with the TMM values calculated by transcriptome.

Download Full-text

Soil Effects on Stem Growth and Wood Anatomy of Tamboril Are Mediated by Tree Age

Forests ◽

10.3390/f12081058 ◽

2021 ◽

Vol 12 (8) ◽

pp. 1058

Author(s):

Talita dos Santos Angélico ◽

Carmen Regina Marcati ◽

Sergio Rossi ◽

Magali Ribeiro da Silva ◽

Júlia Sonsin-Oliveira

Keyword(s):

Soil Type ◽

Wood Anatomy ◽

Tree Age ◽

Soil Conditions ◽

Plant Soil ◽

Wood Traits ◽

Soil Effects ◽

Old Trees ◽

The Relationship ◽

Effect Of Age

Soil influences the growth of trees and the characteristics of the wood; but could this influence change during the ontogeny of trees? To answer this question, we analyzed the wood anatomy of 9-year-old trees and 2-year-old saplings of Enterolobium contortisiliquum, known as “tamboril”, growing in eutrophic and oligotrophic soil in the Brazilian Cerrado, and assessed the effect of age on plant–soil relationship. Sapwood samples were collected from the main stem, anatomical sections were prepared in the lab, and 12 anatomical wood traits were measured. Individuals in eutrophic soil had greater stem diameter and height than those in oligotrophic soil. Trees in eutrophic soil had vessel-associated parenchyma cells with abundant storage compounds. Fibers walls were 47% thicker and intervessel pits diameter were 14% larger in trees of eutrophic soil. A greater proportion of solitary vessels (74%) was observed in trees rather than in saplings (50%). The secondary xylem of trees was mainly formed by fibers (63%) whereas in saplings it was mainly formed by storage tissue (64%). Our study provides evidence that the influence of soil conditions on tree growth reflects variations in wood anatomical features. No significant response to soil type was observed in saplings, thus demonstrating that the relationship between soil type and wood growth is mediated by tree age. These findings help to develop reliable reforestation strategies in tropical ecosystems characterized by different levels of soil fertility.

Download Full-text

KERAGAMAN JENIS DAN POPULASI MIKORIZA ARBUSKULA DALAM BERBAGAI KELOMPOK UMUR PINUS TUMPANGSARI KOPI DI UB FOREST

Jurnal Tanah dan Sumberdaya Lahan ◽

10.21776/ub.jtsl.2021.008.1.2 ◽

2020 ◽

Vol 8 (1) ◽

pp. 9-17

Author(s):

Achmad Jauhar Arifin ◽

Budi Prasetya ◽

Syahrul Kurniawan

Keyword(s):

Arbuscular Mycorrhiza ◽

Arbuscular Mycorrhizae ◽

Block Design ◽

Chemical Properties ◽

Tree Age ◽

Available P ◽

Survey Method ◽

Age Group ◽

The Relationship ◽

Total P

Differences in tree age and cropping systems may influence the microbial diversity, including fungal species and population. The purpose of this study was to determine the diversity, of species and population of arbuscular mycorrhiza spores and the relationship between the number of arbuscular mycorrhiza spores and the soil chemical properties in different pine age group and coffee as an intercropping system at sloped areas. The study was conducted from April to July 2017. The study used a survey method with 5 age groups (KU) and three replications. The study was divided into 3 stages: 1). collection of soil and root samples, as well as measuring plot characteristics (i.e. basal area, canopy cover, standing litter mass); 2). Measurement of Mycorrhizal in the laboratory (spore extraction, spore identification, root colony percentage analysis); 3). Soil Chemical Analysis (pH, total P, available P). All data was tabulated, and tested using ANOVA with Randomized Block Design. If there is a significantly different, a further LSD test is performed with a level of 5%. Correlation and regression tests were performed to determine the relationship between parameters. The results showed that there were significant differences in the parameters of canopy density, number of genus spores of Acaulospora 100 g-1 soil, Soil pH, and total P in the soil. However, the study was unable to detect significant differences in, other parameters, such as root infection, number population of Glomus and Gigaspore, available P, etc.. The correlation test showed that the increase in the age group of the coffee intercropping system did not correlate with the number of arbuscular mycorrhizae in each plot observed. The number of Arbuscular Mycorrhizal Spores in each age group of intercropping pine did not correlate with the soil's chemical properties (pH, P-Total, P-Available).

Download Full-text