of Botany,Chinese Academy Of Sciences
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Full-length transcriptome-referenced analysis reveals crucial roles of hormone and wounding during induction of aerial bulbils in lily
No full textAerial bulbils are important vegetative reproductive organs in Lilium. They are often perpetually dormant in most Lilium species, and little is known about the induction of these vegetative structures. The world-famous Oriental hybrid lily cultivar 'Sorbonne', which blooms naturally devoid of aerial bulbils, is known for its lovely appearance and sweet fragrance. We found that decapitation stimulated the outgrowth of aerial bulbils at lower stems (LSs) and then application of low and high concentrations of IAA promoted aerial bulbils emergence around the wound at upper stems (USs) of 'Sorbonne'. However, the genetic basis of aerial bulbil induction is still unclear. Herein, 'Sorbonne' transcriptome has been sequenced for the first time using the combination of third-generation long-read and next-generation short-read technology. A total of 46,557 high-quality non-redundant full-length transcripts were generated. Transcriptomic profiling was performed on seven tissues and stems with treatments of decapitation and application of low and high concentrations of IAA, respectively. Functional annotation of 1918 DEGs within stem samples of different treatments showed that hormone signaling, sugar metabolism and wound-induced genes were crucial to bulbils outgrowth. The expression pattern of auxin-, shoot branching hormone-, plant defense hormone- and wound-inducing-related genes indicated their crucial roles in bulbil induction. Then we established five hormone- and wounding-regulated co-expression modules and identified some candidate transcriptional factors, such as MYB, bZIP, and bHLH, that may function in inducing bulbils. High connectivity was observed among hormone signaling genes, wound-induced genes, and some transcriptional factors, suggesting wound- and hormone-invoked signals exhibit extensive cross-talk and regulate bulbil initiation-associated genes via multilayered regulatory cascades. We propose that the induction of aerial bulbils at LSs after decapitation can be explained as the release of apical dominance. In contrast, the induction of aerial bulbils at the cut surface of USs after IAA application occurs via a process similar to callus formation. This study provides abundant candidate genes that will deepen our understanding of the regulation of bulbil outgrowth, paving the way for further molecular breeding of lily
Overexpression of HLH4 Inhibits Cell Elongation and Anthocyanin Biosynthesis in Arabidopsis thaliana
No full textIn plants, many basic helix-loop-helix (bHLH) transcription factors are involved in controlling cell elongation. Three bHLH proteins, PACLOBTRAZOL RESISTANCE1 (PRE1), Cryptochrome Interacting Basic Helix-loop-helix 5 (CIB5), and Arabidopsis ILI1 binding bHLH1 (IBH1) form a triantagonistic system that antagonistically regulates cell elongation in a competitive manner. In this study, we identified a new player, HLH4, related to IBH1, that negatively regulates cell elongation in Arabidopsis thaliana. Overexpression of HLH4 causes dwarf and dark green phenotypes and results in the downregulation of many key regulatory and enzymatic genes that participate in the anthocyanin biosynthetic pathway. HLH4 interacts with CIB5 and PRE1. By interacting with CIB5, HLH4 interferes with the activity of CIB5, and thus inhibiting the transcription of cell elongation-related genes regulated by CIB5, including EXPANSINS8 and 11 (EXP8 and EXP11) and indole-3-acetic acid 7 and 17 (IAA7 and IAA17). The interference of HLH4 on CIB5 is counteracted by PRE1, in which these bHLH proteins form a new tri-antagonistic system
A Study on Cultural Context Perception in Huizhou Cultural and Ecological Reserve Based on Multi-Criteria Decision Analysis
No full textTourists' environmental perception is the decisive factor of cultural tourism experience. Although this topic research is relatively common, there are essential differences between different theme tourism areas. This study selects the national Huizhou Cultural and Ecological Reserve in China as the research object, which has a diverse cultural field, a wide range of researchable levels, and research theoretical support, and focuses on the evaluation of tourists' environmental perceptions of cultural-themed tourism reserves. The research is in line with the basic consensus of the international community on the relationship between NRM conservation and sustainable development and has a positive significance for cultural conservation. In this study, nine indicators were constructed from the three dimensions of cultural perception, environmental perception, and emotional perception, including mental pleasure, experience comfort, audiovisual richness, cultural awareness, cultural diversity, cultural influence, facilities completeness, environment tidiness, and travel convenience. Questionnaires (283) were distributed, 260 of which were valid. The analytic hierarchy process (AHP) and entropy method were used to study the cultural context perception of Huizhou Cultural Ecological Reserve. The Cronbach coefficient was 0.977, the KMO value was 0.953, and the validity was 91.87%. The research results show that, first, tourists' perception level from high to low is cultural perception (0.351), environmental perception (0.349), and emotional perception (0.301). Secondly, the factors most strongly perceived by tourists are tourism convenience (0.129), cultural influence (0.126), cultural diversity (0.118), and facilities completeness (0.115). Thirdly, improving tourists' spiritual pleasure, experience comfort, audiovisual richness, cultural recognition, and environmental cleanliness is conducive to promoting tourists' perception and experience
DNA Methylation Correlates With Responses of Experimental Hydrocotyle vulgaris Populations to Different Flood Regimes
No full textEpigenetic mechanisms such as DNA methylation are considered as an important pathway responsible for phenotypic responses and rapid acclimation of plants to different environments. To search for empirical evidence that DNA methylation is implicated in stress-responses of non-model species, we exposed genetically uniform, experimental populations of the wetland clonal plant Hydrocotyle vulgaris to two manipulated flood regimes, i.e., semi-submergence vs. submergence, measured phenotypic traits, and quantified different types of DNA methylation using MSAP (methylation-sensitive amplified polymorphism). We found different epi-phenotypes and significant epigenetic differentiation between semi-submerged and submerged populations. Compared to subepiloci (denoting DNA methylation conditions) for the CG-methylated state, unmethylation and CHG-hemimethylation subepiloci types contribute more prominently to the epigenetic structure of experimental populations. Moreover, we detected some epimarker outliers potentially facilitate population divergence between two flood regimes. Some phenotypic variation was associated with flood-induced DNA methylation variation through different types of subepiloci. Our study provides the indication that DNA methylation might be involved in plant responses to environmental variation without altering DNA sequences
Editorial: Soil microbes in polar region: Response, adaptation and mitigation of climate change
No full textApplication of -omic technologies in postharvest pathology: recent advances and perspectives
No full textFungal pathogens, the causative agents of postharvest decay and mycotoxin contamination in a fruit, are major threats to food quality and safety worldwide. Control of postharvest decay is a significant challenge because of the limited availability of management options. -Omic technologies based on highthroughput sequencing have provided a powerful research tool for understanding complex pathological processes, which can then be used for the development of innovative control strategies. This review provides an overview of the use of -omic technologies that have been used to investigate pathogens and their interactions with fruit and with other microorganisms, and also highlights research questions that still need to be addressed to fully understand the biology of postharvest diseases and the development of new, safe and effective methods of control
Spatiotemporal Pattern of Ecosystem Respiration in China Estimated by Integration of Machine Learning With Ecological Understanding
No full textAccurate estimation of regional and global patterns of ecosystem respiration (ER) is crucial to improve the understanding of terrestrial carbon cycles and the predictive ability of the global carbon budget. However, large uncertainties still exist in regional and global ER estimation due to the drawbacks of modeling methods. Based on eddy covariance ER data from 132 sites in China from 2002 to 2020, we established Intelligent Random Forest (IRF) models that integrated ecological understanding with machine learning techniques to estimate ER. The results showed that the IRF models performed better than semiempirical models and machine learning algorithms. The observed data revealed that gross primary productivity (GPP), living plant biomass, and soil organic carbon (SOC) were of great importance in controlling the spatiotemporal variability of ER across China. An optimal model governed by annual GPP, living plant biomass, SOC, and air temperature (IRF-04 model) matched 93% of the spatiotemporal variation in site-level ER, and was adopted to evaluate the spatiotemporal pattern of ER in China. Using the optimal model, we obtained that the annual value of ER in China ranged from 5.05 to 5.84 Pg C yr(-1) between 2000 and 2020, with an average value of 5.53 +/- 0.22 Pg C yr(-1). In this study, we suggest that future models should integrate process-based and data-driven approaches for understanding and evaluating regional and global carbon budgets
Effects of decadal nitrogen addition on carbon and nitrogen stocks in different organic matter fractions of typical steppe soils
No full textRecent frameworks have proposed that division of soil organic matter (SOM) into particulate and mineral-associated organic matter (POM and MAOM) can help us better understand SOM cycling and its responses to increasing atmospheric nitrogen (N) deposition. However, responses of these factions to N deposition with combination of their relative distribution across soil profile remain unclear. Here we determined total N and soil organic carbon (SOC) as POM and MAOM separately in soils at depths of 0-10, 30-40 and 70-100 cm after 10-year N addition (at rates of 50, 10, 2 and 0 g m(-2) yr(-1)) in a typical steppe. We further calculated their stocks in POM, MAOM and bulk soil and detected their relationships with both physicochemical features and microbial properties. Nitrogen addition increased the stocks of SOC (POM: +23 %; MAOM: +11 %) and total N (POM: +27 %; MAOM: +10 %) in both POM and MAOM fractions in topsoil (0-10 cm), but increased only in MAOM in 30-40 cm (SOC: +24 %; total N: +24 %) and 70-100 cm (SOC: +15 %; total N: +13 %) soils. Moreover, the increasing effects were strengthened with increasing N addition rates. We found that the share of SOC and total N in the MAOM was slightly decreased by N addition in topsoil, but significantly increased in deeper soils. Soil physicochemical features exerted stronger controls than microbial properties in the distribution of SOC and total N in the two fractions regardless of soil depth. SOC and total N contents of MAOM were correlated negatively with soil pH across the soil profile, and were correlated positively with bulk soil total N, dissolved organic N and inorganic N. Our findings imply that more soil C would be stabilized as MAOM under increasing atmospheric N deposition, and therefore the C saturation level of MAOM should be a target for further studies and be considered in predicting SOM dynamics, especially in N-limited grassland ecosystems
Divergent Trajectory of Soil Autotrophic and Heterotrophic Respiration upon Permafrost Thaw
No full textWarming-induced permafrost thaw may stimulate soil respiration (Rs) and thus cause a positive feedback to climate warming. However, due to the limited in situ observations, it remains unclear about how Rs and its autotrophic (Ra) and heterotrophic (Rh) components change upon permafrost thaw. Here we monitored variations in Rs and its components along a permafrost thaw sequence on the Tibetan Plateau, and explored the potential linkage of Rs components (i.e., Ra and Rh) with biotic (e.g., plant functional traits and soil microbial diversity) and abiotic factors (e.g., substrate quality). We found that Ra and Rh exhibited divergent responses to permafrost collapse: Ra increased with the time of thawing, while Rh exhibited a hump-shaped pattern along the thaw sequence. We also observed different drivers of thaw-induced changes in the ratios of Ra:Rs and Rh:Rs. Except for soil water status, plant community structure, diversity, and root properties explained the variation in Ra:Rs ratio, soil substrate quality and microbial diversity were key factors associated with the dynamics of Rh:Rs ratio. Overall, these findings demonstrate divergent patterns and drivers of Rs components as permafrost thaw prolongs, which call for considerations in Earth system models for better forecasting permafrost carbon-climate feedback
Sodium pyrosulfite inhibits the pathogenicity of Botrytis cinerea by interfering with antioxidant system and sulfur metabolism pathway
No full textGrapes are cultivated worldwide and are favored by consumers for their delicious taste and nutritional value. Grey mould, caused by Botrytis cinerea, leads to considerable loss of postharvest grape fruit each year. Sulfur dioxide fumigation is widely used to inhibit grey mould of grape around the world, but there is still a lack of research on its antimicrobial mechanism, especially at molecular level. In present study, we explored the molecular mechanisms of sulfur dioxide against B. cinerea in vitro and in vivo, respectively, using the sulfur dioxide donor sodium pyrosulfite. The results indicated that sodium pyrosulfite treatment could inhibit the expression of genes in antioxidant system and sulfur metabolism pathway of B. cinerea. The down-regulated genes in sulfur metabolism were mainly involved in the process of assimilatory sulfate reduction, limiting the synthesis of sulfur-containing organic compounds. Furthermore, the expressions of several critical antioxidant genes were suppressed under the sodium pyrosulfite stress. The decrease of antioxidant capacity led to ROS accumulation in B. cinerea cell, resulting in the decrease of the survival rate. These results not only richen our understanding of the antimicrobial mechanisms of sulfur dioxide against B. cinerea at the molecular level, but also are beneficial for us to improve sulfur dioxide product in the future