Allelopathic Effects of Aqueous Leaf Extracts from Four Shrub Species on Seed Germination and Initial Growth of Amygdalus pedunculata Pall.

Wang, Xiuqing; Zhang, Ruiqi; Huang, Yi; Feng, Shizhe; Ma, Xu; Zhang, Yuyu; Sikdar, Ashim; Roy, Rana

doi:10.3390/f9110711

Cited by 26 publications

(17 citation statements)

References 43 publications

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“…Our results are in agreement with the reports from other studies, i.e. allelopathy frequently depends on allelochemical concentrations [34]. Studies have shown that allelochemicals inhibit the synthesis of indoleacetic acid and gibberellin, thus hindering germination in target plants [35].…”

Section: Effect Of Leaf Litter Water Extract On Seed Germination and supporting

confidence: 93%

Appropriate Removal of Forest Litter is Beneficial to Pinus tabuliformis Carr. Regeneration in a Pine and Oak Mixed Forest in the Qinling Mountains, China

Huo

Wang

Bing

et al. 2019

Forests

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Research Highlights: Natural regeneration is important in pine–oak mixed forests (Pinus armandii Franch., Pinus tabuliformis Carr., and Quercus aliena Bl. var. acuteserrata Maxim.ex Wenz.), but allelopathy as a limiting factor has not been studied. Our research provides insights into allelopathy in pine–oak mixed forest litter. Background and Objectives: Allelopathy among tree species occupying the same ecological niche in mixed forests may adversely affect regeneration. We studied allelopathy in pine and oak forest litter to determine the effect on regeneration, whether it is offset by adding activated carbon or plant ash, and what allelopathic substances are present. Materials and Methods: We used laboratory seed culture and field seeding to determine pine and oak litter regeneration effects on P. tabuliformis and P. armandii in the Qinling Mountains, China. In the laboratory, we irrigated seeds with three different litter concentrations. A fourth treatment incorporated activated carbon. The field study established small quadrats in mixed forest to study how removing or retaining litter and spreading plant ash affected sown seeds. High performance liquid chromatography–mass spectrometry was used to compare differences in chemical substances in extracts with and without activated carbon. Results: Litter extracts significantly affected germination rates in both species. Seedling morphological and physiological indexes showed that litter extracts negatively affected growth in both species, but activated carbon alleviated this inhibitory effect on P. armandii. Forest stand and litter did not affect P. armandii seed germination. Pinus tabuliformis germination rates were significantly higher in plots with removed litter than when litter was retained or plant ash spread, and lower in oak than pine forest. Allelopathic substances detected in pine forest were trioctyl trimellitate, amyloid β-Peptide 10–20, and triisobutyl phosphate, potentially affecting P. armandii seed germination and growth. Conclusions: Appropriate removal of litter in mixed forests can improve the natural regeneration ability of P. tabuliformis.

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Section: Effect Of Leaf Litter Water Extract On Seed Germination and supporting

confidence: 93%

Appropriate Removal of Forest Litter is Beneficial to Pinus tabuliformis Carr. Regeneration in a Pine and Oak Mixed Forest in the Qinling Mountains, China

Huo

Wang

Bing

et al. 2019

Forests

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“…The experimental methods for seed germination and seedling growth followed Mahboobi and Heidarian (2016) , and specific operating parameters were obtained as previously described in Wang et al (2018) .…”

Section: Methodsmentioning

confidence: 99%

“…Our previous study has shown that some shrubs and herbs can induce seed germination and seedling growth in A. pedunculata ( Wang et al, 2018 ; Zhang et al, 2018 ). Trees are an important part of mixed plantations; however, few studies have assessed the ability of trees to facilitate A. pedunculata seed germination and seedling growth.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Leaf Extracts of Four Tree Species on Amygdalus pedunculata Seedlings Growth

Wang

Zhang

Di³

et al. 2021

Front. Plant Sci.

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Vegetation reconstruction is an urgent problem in fragile environment like coal mine subsidence areas. Amygdalus pedunculata is an important eco-economic shrub species that promotes wind prevention, sand fixation as well as soil and water conservation. The natural regeneration of pure Amygdalus pedunculata forests is difficult to achieve because of its low seed germination rate and weak seedling growth. A stereo-complex ecosystem could potentially promote the germination and seedling growth of A. pedunculata and establish a steady mixed plantation consisting of trees and shrubs. Here, laboratory and pot experiments were conducted to assess the effect of four tree species on morphological and physiological indexes of A. pedunculata. The laboratory experiment showed that A. pedunculata seed germination and seedling growth from Yuyang County (YC-1) and Shenmu County (SC-6) were higher when plants were treated with the aqueous leaf extracts of Pinus sylvestris, Broussonetia papyrifera, and Pinus tabulaeformis compared with Populus simonii at concentrations of 2.5% (E2.5) and 5% (E5). Furthermore, the donor leaf extract was more sensitive to YC-1 than to SC-6. The pot experiment showed that the E2.5 and E5 treatments with the aqueous leaf extracts on the three tree species had strong promoting effects of seedling length, root length, seedling fresh weight, root fresh weight, and ground diameter for YC-1. The activity of catalase of A. pedunculata seedlings first increased and then decreased, while the activity of peroxidase, superoxide dismutase, roots, and the contents of soluble protein and chlorophyll decreased; the opposite patterns were observed for malondialdehyde, soluble sugar, cell membrane permeability, and proline were the opposite. Synthetical allelopathic effect index values of the leaf extracts of the three species on YC-1 were as follows: P. sylvestris > B. papyrifera > P. tabulaeformis (E2.5 to E20). Therefore, P. sylvestris and B. papyrifera could be used to promote the growth of A. pedunculata seedlings as well as for the construction of mixed plantations in coal mine degradation areas. Generally, this study provides new insight into the creation of stereo-complex ecosystems (P. sylvestris + A. pedunculata and B. papyrifera + A. pedunculata) in arid fragile environment.

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“…All the 18 litter samples collected from each forest type were combined and homogenized after natural air drying in the laboratory. For each forest type, 400 g of the mixed litter was weighed and immersed in 4 L of distilled water for 24 h. The leachate was filtered with double gauze and used as a stock solution (0.1 g/mL), and then the solution was diluted (0.1 g/mL, 0.05 g/mL or 0.025 g/mL) with distilled water and used as three concentration treatments [56,57]. The pH of the leachate was measured using an electrode pH meter in triplicate.…”

Section: Forest Litter Leachate Bioassay and Pot Experimentsmentioning

confidence: 99%

The Effects of Soils from Different Forest Types on the Growth of the Invasive Plant Phytolacca americana

Chen

Hou

Zhuge

et al. 2019

Forests

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Due to increasing globalization and human disturbance, plant invasion has become a worldwide concern. Soil characteristics associated with the vegetation of recipient communities affect plant invasion success to a great extent. However, the relative importance of soil biotic and abiotic factors of different recipient communities in resisting plant invasion is not fully understood. We hypothesized that natural forest soils can better resist plant invasion than can plantation soils, that the allelopathic legacy of resident trees in soil plays a role in resisting invasive plants, and that late-successional soils have a strong effect. We examined the effects of soil and litter collected from four natural forests at successional stages and one Robinia pseudoacacia Linn. plantation in eastern China on the growth of Phytolacca americana L., which is a highly invasive species across China, and explored the individual effects of soil nutrients, allelochemicals, and soil microbes. We found that allelopathic activity of natural forest soils can effectively resist P. americana invasion, and that low level of nutrients, especially of phosphorus, in the soils might be potential limiting factors for the plant growth. The profound conditioning of soil resources by exotic R. pseudoacacia based on tree traits (including allelopathy) facilitated further P. americana invasion. Allelochemicals from forest litter inhibited the germination of P. americana seeds, but pH played a major role in P. americana growth when these substances entered the soil. However, we have no evidence that late-successional forest soils exhibit strong allelopathy toward P. americana. The present study will help to further our understanding of the mechanism of community resistance to invasion.

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Allelopathic Effects of Aqueous Leaf Extracts from Four Shrub Species on Seed Germination and Initial Growth of Amygdalus pedunculata Pall.

Cited by 26 publications

References 43 publications

Appropriate Removal of Forest Litter is Beneficial to Pinus tabuliformis Carr. Regeneration in a Pine and Oak Mixed Forest in the Qinling Mountains, China

Appropriate Removal of Forest Litter is Beneficial to Pinus tabuliformis Carr. Regeneration in a Pine and Oak Mixed Forest in the Qinling Mountains, China

The Effects of Leaf Extracts of Four Tree Species on Amygdalus pedunculata Seedlings Growth

The Effects of Soils from Different Forest Types on the Growth of the Invasive Plant Phytolacca americana

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