Journal of Beijing Forestry University

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1Genetic transformation and functional characterization of Chimonanthus praecox SAMT gene in tobacco
2Forest canopy height estimation using LiDAR and optical multi-angler data
3Quantitative analysis of stand spatial structure of Cunninghamia lanceolata non-commercial forest based on Voronoi diagram.
4Forest carbon sequestration potential in China under the background of carbon emission peak and carbon neutralization
5Soil organic carbon stabilization and formation: mechanism and model
6ENVI-met model; sensitivity analysis; three-dimensional temperature field of vegetated scenes
7Changes in forest resource carbon storage in China between 1949 and 2018
8Review on the evaluation of global forest carbon sink function
9Responses of leaf morphological traits for broadleaved woody plants along the altitudinal gradient of Changbai Mountain,northeastern China. Journal of Beijing Forestry University
10Pathway and method of forest health assessment using remote sensing technology
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Transcriptome based ABA mediated dehydration response of Salix matsudana branches

Hu Yaofang, Li Ao, Yin Jiahui, Wang Yuancheng, Zou Junzhu, Ju Guansheng, Liu Junxiang, Sun Zhenyuan

Abstract： Objective

ABA is a key hormone for drought stress in plants. This study aimed to explore the key functional genes and related pathways for ABA-mediated dehydrated response of Salix matsudana for breeding superior drought-resistant varieties through molecular design breeding.

Method

In this study, we investigated the differential response of xylem transcriptome of S. matsudana branches dehydrated to varied water potentials after being soaked in the sodium tungstate (ABA synthesis inhibitor) solution by transcriptome sequencing, using S. matsudana isolated branches as materials.

Result

(1) There were 5 672 significantly different genes between the deionized water-soaked S. matsudana non-dehydrated branches and those dehydrated to P₅₀ water potential branches, and 5 033 significantly different genes between the sodium tungstate solution-soaked branches and deionized water-soaked dehydrated to P₅₀ water potential branches. (2) Plant hormone signal transduction, carotenoid biosynthesis and starch and sucrose metabolism pathways were key pathways in the dehydrated response of S. matsudana branches after being soaked in the sodium tungstate solution. (3) Soaking Salix matsudana in deionized water until P50 water potential resulted in significantly increased expression levels of PP2C family genes (P2C03, P2C51), ABA receptor regulatory component genes (PYL8), and ABA response element binding protein genes (AI5L5) in the plant hormone signaling pathway compared with non dehydrated branches. In the biosynthesis pathway of carotenoids, the expression levels of carotenoid isomerase gene (CRTSO) and abscisic aldehyde oxidase gene 3 (ALDO3) were significantly upregulated. In the starch and sucrose metabolism pathways, the expression levels of glycosyl hydrolase family genes (INVA, E133), α - amylase like 3 gene (AMY3), trehalose phosphatase gene (TPS5), sucrose phosphate synthase 1 gene (SPSA1), etc. were significantly upregulated, while the expression level of starch synthase gene (SSY1) was significantly downregulated. The related genes were opposite expressed in the dehydrated branches of S. matsudana after being soaked in the sodium tungstate solution.

Conclusion

In this study, the drought stress-related pathways and the important functional genes of S. matsudana are explored, which provides the research basis for revealing drought stress response of S. matsudana.

[Review Detail]

Analysis methods and characteristic parameters of wood microstructure

Qi Chusheng, Zhan Zhibin, Dai Lu

Abstract：

Wood is a multi-scale and highly anisotropic natural polymer material, which consists of cellulose, hemicellulose, lignin and other components of a complex three-dimensional network structure. These structures are the key factors affecting micro-macroscopic physical and mechanical properties of wood, and the microstructure and main characteristic parameters of wood are of great significance to the understanding of properties of wood as well as wood modification and processing and utilization. This paper comprehensively analyzes the methods of wood microstructure analysis and summarizes its main characteristic parameters. In terms of analytical methods, microscopic observation, X-ray radiography and diffraction analysis, computed tomography and other technologies were widely used, combined with data acquisition and two-dimensional and three-dimensional imaging methods, can reconstruct wood microstructural models, measure microstructural parameters, and reconstructed structural models revealed clearer micro-morphological features. The microstructural parameters of wood mainly include cellular structure parameters, porosity, cellulose microfilaments and other parameters of wood. At present, the observation and study of microstructure is mostly limited to the micron scale, and the analysis of nanoscale and smaller molecular scale structure is mainly based on theoretical simulation, and the structural analysis methods that can be directly observed and characterized need to be further studied in depth.

[Review Detail]

Bottleneck problems and their solutions in the industrialization process of Eucommia ulmoides

Kang Xiangyang

Abstract：

Eucommia ulmoides is a unique and multipurpose economic tree species endemic to China, possesses remarkable developmental potential due to its abundant Eucommia rubber (Eu-rubber) and various medicinal compounds in leaves, bark and other tissues. This paper provides a comprehensive review of the research and development history of Eucommia ulmoides industry in China over the past 60 years, identifying the persistently high costs of raw material production or extraction as a critical bottleneck hindering substantial advancements in the Eu-rubber industry. Particularly in the current era where traditional farmers are gradually disappearing, the labor-intensive arbor forest management model for leaf or fruit-oriented cultivation struggles to support large-scale, low-cost raw material production due to constraints in human resources and rising labor costs. To address this challenge, it is essential to develop high-yielding triploid Eucommia ulmoides varieties with enhanced Eu-rubber and medicinal properties, coupled with a raw material production model based on leaf forest cultivation and mechanized harvesting. This approach can shorten production cycles and reduce planting, management and harvesting costs. Additionally, adopting an organ-specific whole-plant processing and utilization model can help distribute raw material costs more evenly and improve economic efficiency. Consequently, the primary bottleneck restricting Eucommia ulmoides industrialization has shifted to the integration of capital and advanced technologies. We therefore suggest that governments and industry alliances leverage their organizational strengths to effectively consolidate resources such as capital, technology, talent and market access, fostering co-creation, shared responsibility, and mutual benefits. This will promote the linkage, integration, and sustainable development of the first and second industries in Eucommia ulmoides resource cultivation, processing and utilization.

[Review Detail]