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Forests
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Stress Resistance of Rubber Trees: From Genetics to Ecosystem, 2nd...
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Stress Resistance of Rubber Trees: From Genetics to Ecosystem, 2nd Edition

A special issue of Forests (ISSN 1999-4907). This special issue belongs to the section "Genetics and Molecular Biology".

Deadline for manuscript submissions: 30 March 2025 | Viewed by 409

Special Issue Editors

Prof. Dr. Jiaming Zhang

E-Mail Website
Guest Editor
Hainan Key Laboratory of Microbiological Resources, Institute of Tropical Bioscience and Biotechnology, Hainan Bioenergy Center, Chinese Academy of Tropical Agricultural Sciences, Haikou, China
Interests: environmental science; agricultural plant science; woody plant; genetics; molecular biology; biotechnology
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Feng An

E-Mail Website
Guest Editor
Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, China
Interests: plant physiology and ecology; rubber tree cultivation physiology; abiotic stress
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Han Cheng

E-Mail Website
Guest Editor
Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
Interests: plant molecular biology; plant genome; plant stress biology; rubber tree breeding
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Building upon the success and impact of the inaugural volume, we are thrilled to announce the establishment of the second volume of our Special Issue. As the global demand for natural rubber continues to soar, understanding and enhancing the stress resistance of rubber trees (Hevea brasiliensis) becomes ever more crucial for ensuring sustainable production and economic growth.

In the first volume, we delved into the significance of rubber trees as the primary source of natural rubber, their native habitat in the Amazon rainforest, and the challenges posed by environmental and biotic stresses in suboptimal cultivation regions, particularly Southeast Asia. These stresses significantly impact rubber tree physiology, photosynthesis and, ultimately, latex yield and plantation profitability.

The second volume of this Special Issue aims to further expand the discourse, exploring the latest research advancements and innovative strategies for enhancing rubber trees' stress resistance at multiple levels: from genetics and molecular biology to agronomic practices and ecosystem management.

We invite contributions that delve into the following key areas:

  1. Genetics and Molecular Biology of Stress Resistance: Uncovering the genetic basis of stress tolerance in rubber trees through genome-wide association studies, gene expression analyses and functional validation of candidate genes. This includes studies on the role of transcription factors, signaling pathways and metabolic networks in mediating stress responses.
  2. Biotic Stress Resistance: Addressing the threats posed by pathogens (such as powdery mildew, anthracnose and leaf blight disease) and pests (like leaf mites and root diseases). Contributions may focus on disease resistance mechanisms, host–pathogen interactions and the development of novel disease management strategies.
  3. Abiotic Stress Tolerance: Examining the responses of rubber trees to environmental stresses such as drought, cold, high solar radiation, soil salinity and heavy metal toxicity. Research exploring physiological adaptations, molecular mechanisms of stress tolerance and breeding programs aimed at developing resilient cultivars are welcome.
  4. Agronomic Practices and Ecosystem Management: Highlighting sustainable farming practices that mitigate stress impacts and promote healthy rubber tree growth. This includes studies on irrigation and fertilization strategies, soil management, integrated pest management and the role of biodiversity in enhancing ecosystem resilience.
  5. Translational Research and Implementation: Showcasing the translation of laboratory findings into field-ready solutions. Contributions could feature case studies, best practices and policy recommendations for rubber-producing nations to adopt eco-friendly practices and genetically improved cultivars.

By bringing together researchers from diverse disciplines, this Special Issue aims to foster interdisciplinary collaborations and accelerate the pace of innovation in rubber tree stress resistance research. We believe that our collective efforts will pave the way for more sustainable and resilient rubber production systems, benefiting both the environment and the global economy.

We cordially invite you to submit your original research articles, review articles and short communications that align with the scope of this Special Issue, in efforts to advance the frontiers of knowledge in rubber tree stress resistance and contribute to a greener, more sustainable future.

Prof. Dr. Jiaming Zhang
Prof. Dr. Feng An
Prof. Dr. Han Cheng
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Forests is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • rubber tree genetics and breeding
  • Hevea brasiliensis
  • ethephon stimulation
  • molecular regulation mechanism
  • stress physiology

Published Papers (1 paper)

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Research

21 pages, 5648 KiB  
Article
Photosynthesis and Latex Burst Characteristics in Different Varieties of Rubber Trees (Hevea brasiliensis) under Chilling Stress, Combing Bark Tensile Property and Chemical Component Analysis
by Linlin Cheng, Huichuan Jiang, Guishui Xie, Jikun Wang, Wentao Peng, Lijun Zhou and Feng An
Forests 2024, 15(8), 1408; https://doi.org/10.3390/f15081408 (registering DOI) - 11 Aug 2024
Viewed by 306
Abstract
Rubber trees (Hevea brasiliensis) serve as the primary source of natural rubber. Their native habitat is characterized by warm and humid conditions, so they are particularly sensitive to low temperatures. Under such stress, latex burst can cause severe damage to rubber [...] Read more.
Rubber trees (Hevea brasiliensis) serve as the primary source of natural rubber. Their native habitat is characterized by warm and humid conditions, so they are particularly sensitive to low temperatures. Under such stress, latex burst can cause severe damage to rubber trees, which is due to the uniqueness of their economically productive parts. In order to establish a correlation between young and mature rubber trees and provide a novel prospective for investigating the mechanisms of latex burst and chilling resistance in rubber trees, the chlorophyll contents, photosynthesis, and chlorophyll fluorescence parameters in four varieties of one-year-old rubber tree seedlings were analyzed under artificially simulated chilling stress. The latex burst characteristics were subsequently recorded. A comprehensive statistical analysis of the chilling-resistance rank was conducted using the membership function method and the combination weighting method. Meanwhile, chemical compositions and tensile properties of barks from two-year-old twigs of mature rubber trees were ascertained. A correlation analysis between chilling resistance, chemical compositions, and tensile properties was performed to identify any interrelationships among them. The results showed that the number and the total area of latex-burst positions in variety Reken628 seedlings were greater than those in other varieties, and the lowest number and total area of latex-burst positions were observed in variety RRIM600 and variety PR107, respectively. With the exception of variety GT1, nectar secretion was noted in all other varieties of rubber tree seedlings under chilling stress. The chilling resistance of the four varieties decreased in the following order: variety GT1 > variety RRIM600 > variety PR107 > variety Reken628. The chilling resistance was strongly (p < 0.001) negatively correlated with cellulose content and acid-insoluble lignin content, respectively. The total area of latex burst was significantly (p < 0.001) and positively correlated with holocellulose content and maximum load, respectively. Furthermore, this study also provides new insights into the mechanism of nectar secretion induced by low temperatures and its association with the chilling resistance of rubber trees. Full article
(This article belongs to the Special Issue Stress Resistance of Rubber Trees: From Genetics to Ecosystem, 2nd Edition)
►▼ Show Figures

Figure 1

Figure 1
<p>Changes in photosynthetic pigment contents in rubber tree leaves under chilling stress. (<b>A</b>) Chlorophyll <span class="html-italic">a</span> content. (<b>B</b>) Chlorophyll <span class="html-italic">b</span> content. (<b>C</b>) Total chlorophyll content. (<b>D</b>) Carotenoid content. The data represent the average of three replicates. Bars show standard errors. Different lowercase letters represent significant differences (Duncan’s test of one-way ANOVA, <span class="html-italic">p</span> &lt; 0.05) among different varieties of rubber trees.</p> Full article ">Figure 2
<p>Effect of chilling stress on the chlorophyll fluorescence parameters of rubber tree leaves. (<b>A</b>) The maximum photochemical efficiency of PSII, F<sub>v</sub>/F<sub>m</sub>. (<b>B</b>) The actual photochemical yield of PSII, Φ<sub>PSII</sub>. Data are means ± SEs (n = 3). Different lowercase letters represent significant differences (Duncan’s test of one-way ANOVA, <span class="html-italic">p</span> &lt; 0.05) among different rubber tree varieties.</p> Full article ">Figure 3
<p>Effect of chilling stress on gas exchange parameters. (<b>A</b>) Photosynthetic rate is denoted as P<sub>n</sub>. (<b>B</b>) Stomatal conductance is denoted as G<sub>s</sub>. (<b>C</b>) Intercellular CO<sub>2</sub> concentration is denoted as C<sub>i</sub>. (<b>D</b>) Transpiration rate is denoted as T<sub>r</sub>. Different lowercase letters represent significant differences (Duncan’s test of one-way ANOVA, <span class="html-italic">p</span> &lt; 0.05) among different rubber tree varieties.</p> Full article ">Figure 4
<p>Visual latex burst in different rubber tree seedlings. (<b>A-1</b>–<b>A-3</b>) Variety PR107 seedlings. (<b>B-1</b>–<b>B-4</b>) Variety RRIM600 seedlings. (<b>C-1</b>–<b>C-4</b>) Variety Reken628 seedlings. (<b>D-1</b>–<b>D-3</b>) Variety GT1 seedlings.</p> Full article ">Figure 5
<p>Stress–strain curves for barks of two-year-old twigs in different varieties. Different colors represent different stress–strain curves of different specimens, respectively. (<b>A</b>) Variety PR107. (<b>B</b>) Variety RRIM600. (<b>C</b>) Variety Reken628. (<b>D</b>) Variety GT1.</p> Full article ">Figure 6
<p>Correlation analysis between latex burst in seedlings exposed to chilling stress, bark tensile properties, and chemical components with the chilling resistance of different varieties of rubber trees. CR, chilling resistance; TALB, total area of latex burst; TLBP, total latex burst positions; BT, bark thickness; ML, maximum load; TS, tensile strength; DBP, displacement at break point; EBP, elongation at break point; YM, Young’s modulus; PC, pectin content; CC, cellulose content; AILC, acid-insoluble lignin content; HOC, holocellulose content. The larger the circle and the darker the color, the larger the correlation coefficient. Positive correlations are exhibited in red and negative correlations in blue. Significant differences are marked by asterisks, with the levels of significance indicated as follows: *** <span class="html-italic">p</span> &lt; 0.001.</p> Full article ">
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