Study on life histroy traits of Stellera chamaejasme provide insights into its control on degraded typical steppe

Guo, Lizhu; Zhao, Huan; Zhai, Xiajie; Wang, Kaili; Liu, Li; Wang, Kun; Huang, Ding

doi:10.1016/j.jenvman.2021.112716

Cited by 9 publications

(7 citation statements)

References 38 publications

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“…It has become one of the most serious weeds threatening a wide range of grasslands, which were grazed heavily, posing potential hazards to the grassland ecological safety and its impact on animal husbandry sustainability [ 21 ]. Previous studies of S. chamaejasme focused on its nutrient uptake efficiency and water use efficiency compared to co-existing species [ 21 ], its allelochemicals and allelopathic effects on forages [ 24 ], and weed control techniques and use [ 25 ], but no similar phylogeographical study had ever been conducted on S. chamaejasme . Plant nutrient and stoichiometry are key foliar traits with great ecological importance, but previous publications provide limited insight into the biogeographic leaf nutrient and stoichiometry patterns for S. chamaejasme [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Biogeographic Patterns of Leaf Element Stoichiometry of Stellera chamaejasme L. in Degraded Grasslands on Inner Mongolia Plateau and Qinghai-Tibetan Plateau

Guo

Liu

Meng

et al. 2022

Plants

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Plant leaf stoichiometry reflects its adaptation to the environment. Leaf stoichiometry variations across different environments have been extensively studied in grassland plants, but little is known about intraspecific leaf stoichiometry, especially for widely distributed species, such as Stellera chamaejasme L. We present the first study on the leaf stoichiometry of S. chamaejasme and evaluate its relationships with environmental variables. S. chamaejasme leaf and soil samples from 29 invaded sites in the two plateaus of distinct environments [the Inner Mongolian Plateau (IM) and Qinghai-Tibet Plateau (QT)] in Northern China were collected. Leaf C, N, P, and K and their stoichiometric ratios, and soil physicochemical properties were determined and compared with climate information from each sampling site. The results showed that mean leaf C, N, P, and K concentrations were 498.60, 19.95, 2.15, and 6.57 g kg−1; the average C:N, C:P, N:P, N:K and K:P ratios were 25.20, 245.57, 9.81, 3.13, and 3.21, respectively. The N:P:K-ratios in S. chamaejasme leaf might imply that its growth is restricted by K- or K+N. Moreover, the soil physicochemical properties in the S. chamaejasme-infested areas varied remarkably, and few significant correlations between S. chamaejasme leaf ecological stoichiometry and soil physicochemical properties were observed. These indicate the nutrient concentrations and stoichiometry of S. chamaejasme tend to be insensitive to variations in the soil nutrient availability, resulting in their broad distributions in China’s grasslands. Besides, different homeostasis strength of the C, N, K, and their ratios in S. chamaejasme leaves across all sites were observed, which means S. chamaejasme could be more conservative in their use of nutrients improving their adaptation to diverse conditions. Moreover, the leaf C and N contents of S. chamaejasm were unaffected by any climate factors. However, the correlation between leaf P content and climate factors was significant only in IM, while the leaf K happened to be significant in QT. Besides, MAP or MAT contribution was stronger in the leaf elements than soil by using mixed effects models, which illustrated once more the relatively weak effect of the soil physicochemical properties on the leaf elements. Finally, partial least squares path modeling suggested that leaf P or K contents were affected by different mechanisms in QT and IM regions, suggesting that S. chamaejasme can adapt to changing environments by adjusting its relationships with the climate or soil factors to improve its survival opportunities in degraded grasslands.

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Section: Introductionmentioning

confidence: 99%

Biogeographic Patterns of Leaf Element Stoichiometry of Stellera chamaejasme L. in Degraded Grasslands on Inner Mongolia Plateau and Qinghai-Tibetan Plateau

Guo

Liu

Meng

et al. 2022

Plants

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“…To obtain the 95% confidence interval of the best model, we generated 100 parametric bootstraps. We scaled the results using an assumed mutation rate of 3.1e-9 per site per year calculated by r8s (Sanderson, 2003) and a generation time of 2 years (Guo et al, 2021). To evaluate the goodness-of-fit of the demographic model, 100,000 coalescent simulations under the ML were performed and compared with the observed SFS.…”

Section: Demographic Inferencementioning

confidence: 99%

“…The "pileup" command of the samtools (Li et al, 2009) software to generate diploid consensus sequences, and we performed 100 repetitions of PSMC with parameters -N25 -t15 -r5 -p "4 + 25 * 2 + 4 + 6" to obtain 95% confidence intervals of demographic parameters. We covered estimates to absolute values based on a generation time of 2 years (Guo et al, 2021) and a mutation rate of 3.1e-9 substitutions per site per year calculated by r8s (Sanderson, 2003).…”

Section: Demographic Inferencementioning

confidence: 99%

Genomic divergence of Stellera chamaejasme through local selection across the Qinghai–Tibet plateau and northern China

Yang

et al. 2022

Molecular Ecology

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Understanding how populations diverge and new species arise is a central question in evolutionary biology. “Allopatric” divergence through geographical isolation is considered to be the commonest mechanism generating species biodiversity in mountain ecosystems. However, the underlying genomic dynamics, especially genomic islands of elevated divergence and genes that are highly diverged as a result of lineage‐specific selection, remain poorly understood. Stellera chamaejasme has a wide geographical range across the Qinghai–Tibet Plateau and northern China, making it a good model with which to explore genomic divergence during speciation in mountain ecosystems. We assembled a high‐quality, chromosome‐level genome for this species and resequenced the genomes of 24 populations across its major distribution. Our population genomic analyses recovered four distinct genetic lineages corresponding to geographical distributions with contrasting environments. However, we revealed continuous gene flow during the historical divergences of these four lineages. Interlineage hybrids and plastome introgressions were frequently found in regions of contact, which further increased gene flow between two contacting lineages in the recent past. The elevated divergences were highly heterogeneous across the genome and selection of ancestral polymorphisims and divergence hitchhiking contributed greatly to the formation of genomic islands. The highly diverged and lineage‐specific positively selected genes within and outside genomic islands were annotated to be mainly involved in local adaptation. Our results suggest that genomic divergence in S. chamaejasme is likely to have been triggered and maintained by local selection together with geographical isolation.

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“…It tastes bitter and flat and can be used to dispel retained water, clear phlegm, achieve accumulation, and kill insects. It has long been used for the treatment of mange, intractable skin diseases, chronic bronchitis, and tuberculosis (9). In recent years, many scholars have studied the in vitro antitumor effects of water extracts of Stellera chamaejasme (10), which can significantly inhibit the proliferation of prostate cancer cells (11,12).…”

Section: Original Articlementioning

confidence: 99%

Effects of Stellera chamaejasme on microvascular density and apoptosis of cancer cells in a rat bladder tumor model

Huang¹,

Zhang²,

Zhang³

et al. 2022

Transl Androl Urol

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Background: Investigate the effects of Stellera chamaejasme on microvascular density and apoptosis of cancer cells in rat bladder tumor models. Methods:The bladder tumor model of 75 specific pathogen-free (SPF)-grade Sprague-Dawley (SD) rats aged 5-6 weeks was established by n-methyl-N-nitrosourea (MNU) bladder perfusion induction, and the model rats were randomly divided into model group, low-dose (L-dose) group, medium-dose (M-dose) group, high-dose (H-dose) group, and positive drug (HCPT) group. L-dose group, M-Dose group, and H-dose group were treated with 5 g/kg, 10 g/kg, and 20 g/kg, respectively. The HCPT group was treated with 2 mg/kg hydroxycamptothecin at 1 mL/kg once a week and the model group were treated with the same amount of normal saline for 4 weeks. The quality of bladder cancer tissues in each group was measured.The pathological changes and microvascular density of bladder tissues were observed, and the apoptosis rate of vascular endothelial growth factor (VEGF), tumor tissue and the protein expression levels of factor associated suicide (Fas), factor associated suicide ligand (FasL) and Caspase3 in bladder tissues were detected.Results: Bladder cancer was induced 14 weeks after initial bladder perfusion with MNU. In the model group, epithelial cells of bladder tissue showed atypically hyperplasia with various sizes and disorders. After treatment with Stellera chamaejasme, the hematoxylin-eosin (HE) scores, bladder weight, microvascular density, and VEGF were significantly decreased, and the tumor inhibition rate, cell apoptosis, and the expression of apoptosis-related proteins Fas, FasL, and Caspase3 were significantly increased in the bladder tissue. The above changes were dose-dependent with Stellera chamaejasme.Conclusions: MNU can be used to prepare a rat bladder cancer model. Stellera chamaejasme has a good therapeutic effect on rat bladder cancer, which may inhibit the progression of bladder cancer by inhibiting micro-angiogenesis and inducing the apoptosis of bladder tumor cells.

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Study on life histroy traits of Stellera chamaejasme provide insights into its control on degraded typical steppe

Cited by 9 publications

References 38 publications

Biogeographic Patterns of Leaf Element Stoichiometry of Stellera chamaejasme L. in Degraded Grasslands on Inner Mongolia Plateau and Qinghai-Tibetan Plateau

Biogeographic Patterns of Leaf Element Stoichiometry of Stellera chamaejasme L. in Degraded Grasslands on Inner Mongolia Plateau and Qinghai-Tibetan Plateau

Genomic divergence of Stellera chamaejasme through local selection across the Qinghai–Tibet plateau and northern China

Effects of Stellera chamaejasme on microvascular density and apoptosis of cancer cells in a rat bladder tumor model

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