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

This study aimed to screen out the shrub species which can promote the seed germination and seedling growth of Amygdalus pedunculata Pall. and offer insight for ecological environment governance of the coal mines subsidence area in Mu Us Sandy Land, Yulin City of Shaanxi Province. The indoor bioassay method was used to study the aqueous leaf extracts from Amorpha fruticosa Linn., Hedysarum mongolicum Turez., Sabina vulgaris Ant., and Hippophae rhamnoides Linn. under different concentration gradients to examine seed germination, initial growth, and physiological and biochemical of two Amygdalus pedunculata varieties (YY-1 from Yuyang County (YY) and SM-6 from Shenmu County (SM), Shaanxi Province, China). The results showed that with aqueous leaf extracts concentrations at lower concentrations of 0.025 (T1) and 0.05 g·mL−1 (T2) from A. fruticosa, H. mongolicum, and S. vulgaris significantly promoted seed germination and seedling growth of two A. pedunculata varieties. Moreover, H. rhamnoides aqueous leaf extracts had the strongest inhibitory effect on seed germination and seedling growth of A. pedunculata, and death occurred at concentrations of 0.15 (T4) and 0.20 g·mL−1 (T5). The enzyme activity and chlorophyll content of the A. pedunculata leaves decreased with an increase in the aqueous leaf extracts concentration of the four shrubs; the change trend of malondialdehyde content was the opposite. Root activity of the A. pedunculata increased and then decreased. The H. mongolicum and S. vulgaris are the most suitable mixed tree species for YY-1, while H. mongolicum and A. fruticosa are the most suitable mixed tree species for SM-6 at a relatively low density with more security. The results provide a theoretical basis and technical support for the establishment of an artificial mixed forest of A. pedunculata in the coal mine subsidence area of Mu Us Sandy Land.

Download Full-text

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

Frontiers in Plant Science ◽

10.3389/fpls.2020.587579 ◽

2021 ◽

Vol 11 ◽

Author(s):

Xiuqing Wang ◽

Ruiqi Zhang ◽

Jinxin Wang ◽

Long Di ◽

Huaibiao Wang ◽

...

Keyword(s):

Seed Germination ◽

Seedling Growth ◽

Coal Mine ◽

Tree Species ◽

Cell Membrane Permeability ◽

Pinus Tabulaeformis ◽

Allelopathic Effect ◽

Fresh Weight ◽

Leaf Extracts ◽

Fragile Environment

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.

Download Full-text

Allelopathic Impacts of an Agroforestry Tree Species (Streblus asper Lour.) on Seed Germination and Seedling Growth of Chickpea

Legume Research - An International Journal ◽

10.18805/lr-4679 ◽

2021 ◽

Author(s):

S. Oraon ◽

S. Mondal

Keyword(s):

Seed Germination ◽

Seedling Growth ◽

Tree Species ◽

Root Length ◽

Inhibitory Effect ◽

Seed Vigor ◽

Shoot Length ◽

Allelopathic Effect ◽

Leaf Extracts ◽

Streblus Asper

Background: Agroforestry might be a better strategy for sustainable land use and crop production. Allelopathic effect of Streblus asper Lour. (Moraceae) an agroforestry tree species was documented on chickpea (Cicer arietinum L.) seed germination and seedling growth. Methods: The present study was conducted to evaluate the allelopathic potentialities of different concentrations (0.125%, 0.25%, 0.5%, 1.0%, 2.5% and 5%) of aqueous leaf extracts of S. asper on seed germination and seedling growth in laboratory based experiments. The allelopathic potentialities were studied based on seed germination, germination rate, root length, shoot length, biomass, seed vigor index etc. Result: The inhibitory effect was more pronounced with the increasing concentrations of aqueous extracts. 5% aqueous leaf extracts showed a maximum inhibitory effect on seed germination, root length, shoot length, dry weight of root and shoot as compared to control. Based on the allelopathic index, concentrations of 5% aqueous extract showed a strong inhibitory effect. Aqueous leaf extracts contain water-soluble allelochemicals which affect the seed germination and seedling growth. The inhibitory allelopathic effect can be taken as serious consideration before plantation of chickpea in an association of this tree species because of its inhibitory effect on seed germination and early stages of development.

Download Full-text

Allelopathic effects of Canada goldenrod leaf extracts on the seed germination and seedling growth of lettuce reinforced under salt stress

Ecotoxicology ◽

10.1007/s10646-018-2004-7 ◽

2018 ◽

Vol 28 (1) ◽

pp. 103-116 ◽

Cited By ~ 16

Author(s):

Congyan Wang ◽

Bingde Wu ◽

Kun Jiang

Keyword(s):

Salt Stress ◽

Seed Germination ◽

Seedling Growth ◽

Leaf Extracts ◽

Allelopathic Effects

Download Full-text

Seed germination in Cerrado species

Brazilian Journal of Plant Physiology ◽

10.1590/s1677-04202008000300002 ◽

2008 ◽

Vol 20 (3) ◽

pp. 167-181 ◽

Cited By ~ 26

Author(s):

Lilian B. P. Zaidan ◽

Rosana C. Carreira

Keyword(s):

Seed Germination ◽

Sulphuric Acid ◽

Tree Species ◽

Light Sensitivity ◽

Dormancy Breaking ◽

Shrub Species ◽

Different Temperatures ◽

Light Effects ◽

And Storage ◽

Herb Species

The aim of this review is to comment on the available data about germination of seeds from herb, shrub and tree species of the Cerrado after the publication of the review written by Felippe and Silva in 1984. Studies on seed germination of herbaceous species focused mainly on the responses of seeds to light, different ranges of temperature and storage in the soil. The majority of seeds from herb species germinate between 20°C and 30°C, and are photoblastic. Alternate temperatures favored germination in some seeds, but changed light sensitivity of the achenes of Bidens gardneri. Seeds of most of the shrub species of Melastomataceae are positive photoblastic; among the Velloziaceae, germination in the dark was observed in some species. Other shrub species show dormancy caused by impermeability of the seed tegument, as described for seeds of some species of Bauhinia. Their dormancy is broken by chemical scarification using sulphuric acid. Seeds of Heteropterys pteropetala are sensitive to very high temperatures, similar to those registered during burnings. Some species were considered to have allelopathic effects and could inhibit the germination of seeds of other species and the establishment of plantlets. Seeds of most tree species do not require light to germinate and the focus of the studies were on methods of dormancy breaking. Sulphuric acid and incisions in the tegument proved to be the most efficient methods to break dormancy. In general, the studies are limited to three major aspects: responses to light, effects of different temperatures and dormancy breaking. More studies are necessary to understand the physiological and biochemical aspects of reserve compounds and their mobilization during germination, as well as the effects of fire in these seeds.

Download Full-text

Studies on effects of seed size on germination and seedling growth of Elaeocarpus and Canarium tree species

INTERNATIONAL JOURNAL OF AGRICULTURAL SCIENCES ◽

10.15740/has/ijas/16.2/270-276 ◽

2020 ◽

Vol 16 (2) ◽

pp. 270-276

Author(s):

Basavaraj L. Tamadaddi ◽

G. Prabhuling

Keyword(s):

Seed Germination ◽

Seed Size ◽

Seedling Growth ◽

Tree Species ◽

Seed Treatment ◽

Growth Parameters ◽

Shoot Length ◽

Medium Size ◽

Dry Matter Accumulation ◽

Collar Diameter

An investigation was undertaken on two medicinally important evergreen tree species of Western Ghats namely, Elaeocarpus munronii and Canarium striuctum to improve seed germination and enhance seedling growth in nursery. The seeds collected from two randomly chosen trees in each species were used for the study. In general seed germination was very poor in both the species. The maximum germination of 4.66 per cent was observed in Elaeocarpus munronii and it was 13.33 per cent in Canarium striuctum. Though big and medium size seeds recorded higher germination per cent than small size seeds in both the species studied, the seed size effect on germination was found to be non-significant. The results of the study revealed that seed size did influence seedling growth in both the species. Seeds of bigger size produced seedlings with higher values of shoot length, root length and collar diameter but their effect on dry matter accumulation was not significant. The effect of seed treatments on seedling growth was not noticed in Elaeocarpus munronii while seed treatment with sulphuric acid in Canarium striuctum showed slight but significant increase in shoot length, however, other growth parameters remained unaffected. The effects of seed size as well as of seed treatment on germination and seedling growth was found to be similar in both the trees species studied.

Download Full-text

Response of walnut (Juglans regia L.) leaf aqueous extracts, on seed germination and seedling growth of wheat (Triticum aestivum L.) in agri-silvi system of Uttarakhand

Journal of Applied and Natural Science ◽

10.31018/jans.v5i2.343 ◽

2013 ◽

Vol 5 (2) ◽

pp. 411-415

Author(s):

Abhishek Bahuguna ◽

Sandhya Bahuguna ◽

Birendra Prasad

Keyword(s):

Seed Germination ◽

Seedling Growth ◽

Juglans Regia ◽

Wheat Variety ◽

Shoot Length ◽

Dependent Manner ◽

Aqueous Extracts ◽

Leaf Extracts ◽

Concentration Dependent Manner ◽

Root And Shoot Length

Effect of different doses of aqueous extracts of walnut leaf was studied on germinating seeds and early seedling growth of wheat variety (cv. VL-616) recommended for hills under West Himalayan agri-silvi system. Seven treatments comprised of distilled water control (0%), 10%, 20%, 30%, 40%, 50% and 60% concentration of leaf extracts were treated. The effect of aqueous extracts was found inhibitive; indicate a direct proportional relationship with concentration dependent manner on seed germination and subsequent seedling growth of wheat. The wheat variety exhibited extent of phytotoxicity at 60% extracts application in comparison to untreated control. Invariably there was a decrease in first count, germination, seedling root and shoot length, seedling fresh and dry weight and vigour index with increasing aqueous extracts concentration on germinating wheat, however the shoot length was observed maximum at 60% concentration.

Download Full-text

Effects of five different salts on seed germination and seedling growth of Haloxylon ammodendron (Chenopodiaceae)

Seed Science Research ◽

10.1079/ssr2004188 ◽

2004 ◽

Vol 14 (4) ◽

pp. 345-353 ◽

Cited By ~ 53

Author(s):

Kazuo Tobe ◽

Xiaoming Li ◽

Kenji Omasa

Keyword(s):

Cell Wall ◽

Plasma Membrane ◽

Seed Germination ◽

Seedling Growth ◽

Saline Soils ◽

Initial Growth ◽

Salt Solutions ◽

Haloxylon Ammodendron ◽

Low Concentration ◽

Low Concentrations

Saline soils contain multiple types of salt, each of which may exert a different effect on seed germination and seedling growth of plants. The effects of five types of salt on the initial growth of Haloxylon ammodendron, a shrub found on both saline and non-saline areas in deserts of China, were investigated. Seeds were incubated at 20°;C in the dark in a solution (0 to –5.1 MPa) of a salt (NaCl, MgCl2, CaCl2, Na2SO4 or MgSO4) or polyethylene glycol (PEG)-6000, or in a salt (NaCl or MgCl2) or PEG solution containing a low concentration of CaCl2. Seed germination, seedling growth and cation (Na+, Mg2+, Ca2+ and K+) contents of seedlings were examined. Each salt had a different effect on seed germination, seedling growth and influx and outflux of cations in the seedlings. In both NaCl and MgCl2 treatments, the addition of low concentrations of CaCl2 favoured seed germination and seedling growth, and reduced K+ outflux from seedlings, but caused no appreciable decrease in the influx of Na+ or Mg2+ into seedlings. Marked abnormalities in seedlings were found only in treatments with Mg2+ salts, but these effects were completely alleviated by a low concentration of Ca2+ (Ca2+/Mg2+ = 0.012). The different responses of the initial growth in H. ammodendron to different isotonic salt solutions were attributed to differences among salt components in membrane permeability, toxicity and effects on functions of the plasma membrane and/or the cell wall.

Download Full-text