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Molecular Mechanisms and Breeding of Biotic- and Abiotic-Stress Tolerance in Trees

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Plant Sciences".

Deadline for manuscript submissions: closed (31 August 2022) | Viewed by 6313

Special Issue Editor

Prof. Dr. Keming Luo

E-Mail Website
Guest Editor
Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, School of Life Sciences, Southwest University, Chongqing 400715, China
Interests: functional genomics of woody plants; secondary cell wall biosynthesis; transcriptional and post-transcriptional regulation; plant biotechnology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Environmental stresses impede plant growth and productivity. With the rapid development of genome sequencing and gene editing technologies, the genomes of economically important tree species with divergence resistance mechanisms can now be exploited to uncover the mechanistic basis of long-term stress adaptation at the woody species level. In the last decade, remarkable progress has been made in the improvement of tree stress resistance, especially in disease resistance, insect resistance, drought resistance, salt resistance, cold resistance, etc. This Special Issue aims to report the latest advancements achieved in molecular mechanism studies on stress resistance and breeding in trees. This includes, but is not limited to, tree genome analysis, comparative genomics, cloning and identification of stress-related genes, function of resistance genes, protein-regulatory networks, secondary metabolic pathways, epigenomics, transcriptomic analysis, genome-wide association research, genome selection, SNP discovery, gene editing and transgenic technologies. Papers detailing bioinformatics tool and databases of tree stress resistance are also welcome.

Prof. Dr. Keming Luo
Guest Editor

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. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. There is an Article Processing Charge (APC) for publication in this open access journal. For details about the APC please see here. 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

  • functional genomics
  • resistance gene expression
  • cold/salt/drought tolerance
  • pathogen/insect tolerance
  • genome sequencing
  • gene editing
  • quantitative trait loci and SNP
  • genome-wide association study
  • transgenic technology for trees
  • marker-assisted selection for resistance genes

Published Papers (3 papers)

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Research

22 pages, 5792 KiB  
Article
Genome-Wide Characterization and Expression Analysis of Fatty acid Desaturase Gene Family in Poplar
by Hui Wei, Ali Movahedi, Songzhi Xu, Yanyan Zhang, Guoyuan Liu, Soheila Aghaei-Dargiri, Mostafa Ghaderi Zefrehei, Sheng Zhu, Chunmei Yu, Yanhong Chen, Fei Zhong and Jian Zhang
Int. J. Mol. Sci. 2022, 23(19), 11109; https://doi.org/10.3390/ijms231911109 - 21 Sep 2022
Cited by 4 | Viewed by 2023
Abstract
Fatty acid desaturases (FADs) modulate carbon–carbon single bonds to form carbon–carbon double bonds in acyl chains, leading to unsaturated fatty acids (UFAs) that have vital roles in plant growth and development and their response to environmental stresses. In this study, a total of [...] Read more.
Fatty acid desaturases (FADs) modulate carbon–carbon single bonds to form carbon–carbon double bonds in acyl chains, leading to unsaturated fatty acids (UFAs) that have vital roles in plant growth and development and their response to environmental stresses. In this study, a total of 23 Populus trichocarpaFAD (PtFAD) candidates were identified from the poplar genome and clustered into seven clades, including FAB2, FAD2, FAD3/7/8, FAD5, FAD6, DSD, and SLD. The exon–intron compositions and conserved motifs of the PtFADs, clustered into the same clade, were considerably conserved. It was found that segmental duplication events are predominantly attributable to the PtFAD gene family expansion. Several hormone- and stress-responsive elements in the PtFAD promoters implied that the expression of the PtFAD members was complicatedly regulated. A gene expression pattern analysis revealed that some PtFAD mRNA levels were significantly induced by abiotic stress. An interaction proteins and gene ontology (GO) analysis indicated that the PtFADs are closely associated with the UFAs biosynthesis. In addition, the UFA contents in poplars were significantly changed under drought and salt stresses, especially the ratio of linoleic and linolenic acids. The integration of the PtFAD expression patterns and UFA contents showed that the abiotic stress-induced PtFAD3/7/8 members mediating the conversion of linoleic and linolenic acids play vital roles in response to osmotic stress. This study highlights the profiles and functions of the PtFADs and identifies some valuable genes for forest improvements. Full article
(This article belongs to the Special Issue Molecular Mechanisms and Breeding of Biotic- and Abiotic-Stress Tolerance in Trees)
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15 pages, 3990 KiB  
Article
The PagKNAT2/6b-PagBOP1/2a Regulatory Module Controls Leaf Morphogenesis in Populus
by Yanqiu Zhao, Yifan Zhang, Weilin Zhang, Yangxin Shi, Cheng Jiang, Xueqin Song, Gerald A. Tuskan, Wei Zeng, Jin Zhang and Mengzhu Lu
Int. J. Mol. Sci. 2022, 23(10), 5581; https://doi.org/10.3390/ijms23105581 - 17 May 2022
Cited by 2 | Viewed by 1748
Abstract
Leaf morphogenesis requires precise regulation of gene expression to achieve organ separation and flat-leaf form. The poplar KNOTTED-like homeobox gene PagKNAT2/6b could change plant architecture, especially leaf shape, in response to drought stress. However, its regulatory mechanism in leaf development remains unclear. In [...] Read more.
Leaf morphogenesis requires precise regulation of gene expression to achieve organ separation and flat-leaf form. The poplar KNOTTED-like homeobox gene PagKNAT2/6b could change plant architecture, especially leaf shape, in response to drought stress. However, its regulatory mechanism in leaf development remains unclear. In this work, gene expression analyses of PagKNAT2/6b suggested that PagKNAT2/6b was highly expressed during leaf development. Moreover, the leaf shape changes along the adaxial-abaxial, medial-lateral, and proximal-distal axes caused by the mis-expression of PagKNAT2/6b demonstrated that its overexpression (PagKNAT2/6b OE) and SRDX dominant repression (PagKNAT2/6b SRDX) poplars had an impact on the leaf axial development. The crinkle leaf of PagKNAT2/6b OE was consistent with the differential expression gene PagBOP1/2a (BLADE-ON-PETIOLE), which was the critical gene for regulating leaf development. Further study showed that PagBOP1/2a was directly activated by PagKNAT2/6b through a novel cis-acting element “CTCTT”. Together, the PagKNAT2/6b-PagBOP1/2a module regulates poplar leaf morphology by affecting axial development, which provides insights aimed at leaf shape modification for further improving the drought tolerance of woody plants. Full article
(This article belongs to the Special Issue Molecular Mechanisms and Breeding of Biotic- and Abiotic-Stress Tolerance in Trees)
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17 pages, 1861 KiB  
Article
One AP2/ERF Transcription Factor Positively Regulates Pi Uptake and Drought Tolerance in Poplar
by Ningning Chen, Jiajia Qin, Shaofei Tong, Weiwei Wang and Yuanzhong Jiang
Int. J. Mol. Sci. 2022, 23(9), 5241; https://doi.org/10.3390/ijms23095241 - 8 May 2022
Cited by 9 | Viewed by 2061
Abstract
Drought decreases the inorganic phosphate (Pi) supply of soil, resulting in Pi starvation of plants, but the molecular mechanism of how plants, especially the perennial trees, are tolerant to drought stress and Pi starvation, is still elusive. In this study, we identified an [...] Read more.
Drought decreases the inorganic phosphate (Pi) supply of soil, resulting in Pi starvation of plants, but the molecular mechanism of how plants, especially the perennial trees, are tolerant to drought stress and Pi starvation, is still elusive. In this study, we identified an AP2/ERF transcription factor gene, PalERF2, from Populus alba var. pyramidalis, and it was induced by both mannitol treatment and Pi starvation. Overexpressing and knocking-down of PalERF2 both enhanced and attenuated tolerance to drought stress and Pi deficiency compared to WT, respectively. Moreover, the overexpression of PalERF2 up-regulated the expression levels of Pi starvation-induced (PSI) genes and increased Pi uptake under drought conditions; however, its RNAi poplar showed the opposite phenotypes. Subsequent analysis indicated that PalERF2 directly modulated expressions of drought-responsive genes PalRD20 and PalSAG113, as well as PSI genes PalPHL2 and PalPHT1;4, through binding to the DRE motifs on their promoters. These results clearly indicate that poplars can recruit PalERF2 to increase the tolerance to drought and also elevate Pi uptake under drought stress. Full article
(This article belongs to the Special Issue Molecular Mechanisms and Breeding of Biotic- and Abiotic-Stress Tolerance in Trees)
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