Publications by authors named "Xinli Xia"

Intercellular communication mediated by CLAVATA3/EMBRYO SURROUNDING REGION-RELATED (CLE) peptides and their receptors is crucial for plant development and environmental adaptation. In this study, 45 and 89 were identified in and × , respectively, and, together with the 52 in , the chromosome localization, gene and protein characteristics, collinearity and gene duplication events, cis-acting regulatory elements in promoters and evolutionary relationships of in these three poplar species were analyzed. The of three poplar species were divided into four subfamilies.

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Alternative splicing (AS) plays crucial post-transcriptional gene function regulation roles in eukaryotic. Despite progress in studying AS at the RNA level, existing methods for AS event identification face challenges such as inefficiency, lengthy processing times, and limitations in capturing the complexity of RNA sequences. To overcome these challenges, we evaluated 10 AS detection tools and selected rMATS for dataset construction.

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Enhanced autoimmunity often leads to impaired plant growth and development, and the coordination of immunity and growth in Populus remains elusive. In this study, we have identified the transcription factors PagWRKY33a/b as key regulators of immune response and growth maintenance in Populus. The disruption of PagWRKY33a/b causes growth issues and autoimmunity while conferring resistance to anthracnose caused by Colletotrichum gloeosporioides.

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Article Synopsis
  • Changes in root system architecture are crucial for plants to adapt to drought conditions, with the role of the FUSCA3 (FUS3) gene from Populus euphratica being highlighted in regulating lateral root (LR) development during drought stress.
  • The study shows that the expression of PeFUS3 increases with dehydration and ABA treatments, and its overexpression leads to enhanced LR growth and drought tolerance, while its knockout results in the opposite effects.
  • PeFUS3 influences auxin transport genes, enhances drought resistance through PePYL3, and interacts with another transcription factor, PeABF2, implicating it in both auxin and ABA signaling pathways for root growth under drought stress.
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Abscisic acid (ABA) signaling has been implicated in plant responses to water deficit-induced osmotic stress. However, the underlying molecular mechanism remains unelucidated. This study identified the RING-type E3 ubiquitin ligase RING ZINC FINGER PROTEIN1 (PtrRZFP1) in poplar (Populus trichocarpa), a woody model plant.

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Background: Current RNA-seq analysis software for RNA-seq data tends to use similar parameters across different species without considering species-specific differences. However, the suitability and accuracy of these tools may vary when analyzing data from different species, such as humans, animals, plants, fungi, and bacteria. For most laboratory researchers lacking a background in information science, determining how to construct an analysis workflow that meets their specific needs from the array of complex analytical tools available poses a significant challenge.

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MicroRNAs are essential in plant development and stress resistance, but their specific roles in drought stress require further investigation. Here, we have uncovered that a Populus-specific microRNAs (miRNA), miR6445, targeting NAC (NAM, ATAF, and CUC) family genes, is involved in regulating drought tolerance of poplar. The expression level of miR6445 was significantly upregulated under drought stress; concomitantly, seven targeted NAC genes showed significant downregulation.

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Plants face a relentless onslaught from a diverse array of pathogens in their natural environment, to which they have evolved a myriad of strategies that unfold across various temporal scales. Cell surface pattern recognition receptors (PRRs) detect conserved elicitors from pathogens or endogenous molecules released during pathogen invasion, initiating the first line of defence in plants, known as pattern-triggered immunity (PTI), which imparts a baseline level of disease resistance. Inside host cells, pathogen effectors are sensed by the nucleotide-binding/leucine-rich repeat (NLR) receptors, which then activate the second line of defence: effector-triggered immunity (ETI), offering a more potent and enduring defence mechanism.

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Article Synopsis
  • The study investigates the role of WOX genes, important for plant growth, in Eucalyptus, a widely cultivated fast-growing tree species.
  • Nine WOX genes (EgWOX1-EgWOX9) were identified from Eucalyptus grandis, with a focus on the Modern/WUS group containing a unique amino acid domain which aids in meristem development and regeneration.
  • The research shows that adding specific peptides from the WUS domain can significantly improve transformation efficiency, enhancing breeding practices for Eucalyptus.
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The regulatory framework of leaf senescence is gradually becoming clearer; however, the fine regulation of this process remains largely unknown. Here, genetic analysis revealed that U2 small nuclear ribonucleoprotein B (U2B″), a component of the spliceosome, is a negative regulator of leaf senescence. Mutation of U2B″ led to precocious leaf senescence, whereas overexpression of U2B″ extended leaf longevity.

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  • Drought stress severely affects plant growth, and this study explores how β-aminobutyric acid (BABA) influences drought resistance in poplar through the Aspartate tRNA-synthetase (AspRS) gene family, particularly the PtrIBI receptors.
  • Researchers identified 12 PtrIBI genes, noting that poplar's genetic evolution included four pairs that arose from whole genome duplication.
  • Treatment with 50 mM BABA showed promise in reducing drought stress damage, leading to the hypothesis that poplar employs a coordinated ABA signaling pathway involving BABA and PtrIBIs to combat drought stress.
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Background: Quantifying intra-specific variation in leaf functional traits along environmental gradients is important for understanding species' responses to climate change. In this study, we assessed the degree of among and within populations variation in leaf functional traits and explored leaf response to geographic and climate change using Caryopteris mongholica as material, which has a wide range of distribution environments.

Results: We selected 40 natural populations of C.

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Leaf senescence is an orderly process regulated by multiple internal factors and diverse environmental stresses including nutrient deficiency. Histone variants are involved in regulating plant growth and development. However, their functions and underlying regulatory mechanisms in leaf senescence remain largely unclear.

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Article Synopsis
  • - F-box proteins are key players in SCF E3 ubiquitin ligase complexes that regulate protein degradation, crucial for plant growth, development, and stress responses.
  • - A study identified 337 F-box genes in poplar, revealing that 74 belong to the F-box associated family, with evidence of gene replication and evolution through genome-wide and tandem duplication.
  • - The analyzed F-box genes are primarily expressed in certain tissues and are involved in drought stress responses, with one specific gene demonstrating significant function in coping with drought.
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Nuclear Factor-Y (NF-Y), composed of three subunits NF-YA, NF-YB and NF-YC, exists in most of the eukaryotes and is relatively conservative in evolution. As compared to animals and fungi, the number of NF-Y subunits has significantly expanded in higher plants. The NF-Y complex regulates the expression of target genes by directly binding the promoter box or by physical interaction and mediating the binding of a transcriptional activator or inhibitor.

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As eukaryotes, plants and animals have many commonalities on the genetic level, although they differ greatly in appearance and physiological habits. The primary goal of current plant research is to improve the crop yield and quality. However, plant research has a wider aim, exploiting the evolutionary conservatism similarities between plants and animals, and applying discoveries in the field of botany to promote zoological research that will ultimately serve human health, although very few studies have addressed this aspect.

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  • Autophagy is a cellular process that helps organisms manage stress by breaking down and recycling internal components, but it's not well understood in woody plants like poplar.
  • In this study, 48 autophagy-related genes (ATG) were identified in the poplar genome, which were grouped into 14 subfamilies and showed some duplication events, indicating a complex evolutionary history.
  • The research also found that certain ATG genes are activated by hormones and stress, particularly PagATG18a, which enhances salt tolerance and reduces oxidative damage, suggesting a significant role in stress adaptation and potential applications for improving poplar cultivation.
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Non-photochemical quenching (NPQ) has been regarded as a safety valve to dissipate excess absorbed light energy not used for photochemistry. However, there exists no general consensus on the photoprotective role of NPQ. In the present study, we quantified the Photosystem II (PSII) photo-susceptibilities (mpi) in the presence of lincomycin, under red light given to five shade-acclimated tree species grown in the field.

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Drought is one of the major limiting factors in the growth of terrestrial plants. Abscisic acid (ABA) and pyrabactin resistance 1/prabactin resistance-1 like/regulatory components of ABA receptors (PYR/PYL/RCARs) play a key role in response to drought stress. However, the underlying mechanisms of this control remain largely elusive in trees.

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Basic leucine zipper (bZIP) proteins play important roles in responding to biotic and abiotic stresses in plants. However, the molecular mechanisms of plant resistance to pathogens remain largely unclear in poplar. The present study isolated a TGACG-binding (TGA) transcription factor, PeTGA1, from Populus euphratica.

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  • Caryopteris mongholica Bunge is a rare shrub found in arid regions of Mongolia and North China, which is declining due to habitat loss from human activities.
  • Genetic analysis of 18 populations revealed high genetic diversity within populations, particularly in the NM17 population, with 90.97% of genetic variation occurring within, rather than between, populations.
  • Key environmental factors affecting genetic variation were identified as optical radiation, minimum temperature, and mean annual precipitation, providing essential data for the conservation and sustainable use of C. mongholica.
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Plants have evolved complex mechanisms to cope with the fluctuating environmental availability of nitrogen. However, potential genes modulating plant responses to nitrate are yet to be characterized. Here, a poplar GATA transcription factor gene PdGNC (GATA nitrate-inducible carbon-metabolism-involved) was found to be strongly induced by low nitrate.

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Leaf senescence is the final stage of leaf development and is influenced by numerous internal and environmental factors. CLE family peptides are plant-specific peptide hormones that regulate various developmental processes. However, the role of CLE in regulating Arabidopsis leaf senescence remains unclear.

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The two homologous genes, and , encode nitrate reductases in , which govern the reduction of nitrate to nitrite. This step is the rate-limiting step of the nitrate assimilation and utilization. Therefore, the regulation of and is important for plant development and growth.

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