scholarly journals Inhibitory impact of Daraikh (Melia Azedarach) leaves litter on wheat (Triticum aestivum) seedling

2021 ◽  
Vol 27 (2) ◽  
pp. 191-200
Author(s):  
Iqtidar Hussain
Keyword(s):  
Triticum Aestivum ◽  
Negative Impact ◽  
Seedling Emergence ◽  
Dry Weight ◽  
Inhibitory Effect ◽  
Germination Percentage ◽  
Melia Azedarach ◽  
Growth Stages ◽  
Initial Growth ◽  
Coleoptile Length

A biological phenomenon by which one plant releases some chemicals in the environment that affect the rate of germination, its seedling emergence and physiology and overall growth of neighboring plants is called allelopathy. The significance of study was checked allelopathic phytochemical potential of Daraikh (Melia Azedarach L.) leaves on Wheat. Leaves litter were used to examine the allelopathic effects of Daraikh (Melia Azedarach) at five concentrations (100, 200, 300, 400 g, control) parameters studied germination percentage (%), Speed of germination, plant height (cm), root length (cm), Shoot length (cm), coleoptile length (cm), Fresh weight (g) and dry weight (g), Tiller (plant-1) and chlorophyll content (µ cm-2) of Triticum aestivum. All concentration of Leaves litter of Melia Azedarach showed pronounced inhibitory effect on all parameters of Triticum aestivum. Melia Azedarach exerted phytotoxic influence on Triticum aestivum at initial growth stages. Melia Azedarach exhibited a significant negative impact on germination of Triticum aestivum at 100, 200, 300, 400 g litter of leaves than control (Sterilized soil) repectively. Melia Azedarach halted the coleoptile length of Triticum aestivum @ 400 g leaves litter. Powdered leaves of Melia Azedarach in clay loam soil appeared to have strong allelopathic inhibition under maximum concentrations on growth and germination of Triticum aestivum. Hence, Melia Azedarach proved a strong allelopathic plant that should be planted aside from field to avoid harmful impacts during early growth stages of Triticum aestivum.

Salinity Tolerance of Black Gram Cultivars During Germination and Early Seedling Growth

2018 ◽  
Vol 51 (3) ◽  
pp. 51-68 ◽  
Author(s):  
M.K. Hasan ◽  
M.S. Islam ◽  
M.R. Islam ◽  
H.N. Ismaan ◽  
A. El Sabagh
Keyword(s):  
Salt Stress ◽  
Salinity Tolerance ◽  
Seedling Growth ◽  
Negative Impact ◽  
Germination Rate ◽  
Dry Weight ◽  
Germination Percentage ◽  
Shoot Length ◽  
Sand Culture ◽  
Black Gram

Abstract A laboratory experiment regarding germination and seedling growth test was conducted with three black gram genotypes tested under three salinity levels (0, 75 and 150 mM), for 10 days, in sand culture within small plastic pot, to investigate the germination and seedling growth characteristics. Different germination traits of all black gram genotypes, like germination percentage (GP), germination rate (GR), coefficient of velocity of germination (CVG) greatly reduced, as well as mean germination time (MGT) increased with increasing salt stress. At high salt stress, BARI Mash-3 provided the highest GP reduction (28.58%), while the lowest was recorded (15.79% to control) in BARI Mash-1. Salinity have the negative impact on shoot and root lengths, fresh and dry weights. The highest (50.32% to control) and lowest reduction (36.39%) of shoot length were recorded in BARI Mash-2 and BARI Mash-1, respectively, under 150 mM NaCl saline conditions. There were significant reduction of root lengths, root fresh and dry weight, shoot length, shoot fresh and dry weight in all genotypes under saline condition. The genotypes were arranged as BARI Mash-1 > BARI Mash-3 > BARI Mash-2, with respect to salinity tolerance.

scholarly journals ALLELOPATHIC POTENTIAL OF WEED SPEICES AGERATUM CONYZOIDES L. AND CLEOME VISCOSA L. ON GERMINATION AND GROWTH OF SESAMUM INDICUM L

2015 ◽  
Vol 2 (2) ◽  
pp. 114-117
Author(s):  
Anbarasan R ◽  
Prabhakaran J
Keyword(s):  
Growth Parameters ◽  
Dry Weight ◽  
Inhibitory Effect ◽  
Germination Percentage ◽  
Sesamum Indicum ◽  
Weed Species ◽  
Ageratum Conyzoides ◽  
Allelopathic Potential ◽  
Germination And Growth ◽  
Cleome Viscosa

Various concentrations (5%, 10%, 15% and 20%) of aqueous extracts prepared from two weed species namely Ageratum conyzoides L. and Cleome viscosa L. and used for the present experiments to determine their allelopathic potential on growth and developmental changes on sesame (Sesamum indicum L.). The weed extracts showed an inhibitory effect on germination percentage, root and shoot growth, and fresh and dry weight of sesame seedlings. The extracts of A.conyzoides had more inhibitory effect at 20%concentration,than that of C.viscosa on growth parameters of sesame.

Evaluation of Herbicidal Potential of Eucalyptus spp for Biological Control of Dactyloctenium aegyptium L.

2021 ◽  
Vol 20 (1) ◽  
pp. 186-191
Author(s):  
Amal Ehtaiwesh
Keyword(s):  
Foliar Application ◽  
Growth Traits ◽  
Negative Impact ◽  
Inhibitory Effect ◽  
Germination Percentage ◽  
Shoot Length ◽  
Dactyloctenium Aegyptium ◽  
Vigor Index ◽  
Root And Shoot Length ◽  
Germination Traits

Pots culture experiment was conducted to evaluates the herbicidal potential of Eucalyptus spp. (aceae) on growth of Dactyloctenium aegyptium L. (Poaceae). Leaves extract with concentrations of 10, 20 and 40% of Eucalyptus plant were applied as soil and foliar application to seeds and seedlings of D. aegyptium species.  The result indicated that the application of Eucalyptus leaves extracts caused significant reduction in germination traits, root and shoot length, seedling fresh and dry weights. Also, the result revealed that the Inhibitory effect of Eucalyptus extract on D. aegyptium L was more noticeable in plant growth traits than on germination traits. Results show that among the different concentration of Eucalyptus leave extracts used in this study, 40% was the most toxic and caused the significant effect on germination and growth traits of Dactyloctenium aegyptium. Application of 40% of Eucalyptus leave extract decreased germination percentage by 30%, mean daily germination by 45%, shoot length by 38%. root length by 54%, number of branches by 61%, number of leavesby59%, seedling fresh weights by 23%, seedling dry weights by 62% and seedling vigor index by 60%. The results of this study concluded that the use of Eucalyptus plants have the potential to be developed further as a bio-herbicide system to control weed such as Dactyloctenium aegyptium L. However, more researches are needed to evaluate the negative impact of Eucalyptus on crop growth.

Japanese Foxtail (Alopecurus japonicus) Management in Wheat in China: Seed Germination, Seedling Emergence, and Response to Herbicide Treatments

2017 ◽  
Vol 32 (2) ◽  
pp. 211-220 ◽  
Author(s):  
Hengzhi Wang ◽  
Yizhao Huang ◽  
Lele Zhang ◽  
Weitang Liu ◽  
Jinxin Wang
Keyword(s):  
Seed Germination ◽  
Integrated Management ◽  
Germination Rate ◽  
Seedling Emergence ◽  
Dry Weight ◽  
Integrated Approach ◽  
Growth Stages ◽  
Ph Values ◽  
Grass Weed ◽  
Different Growth Stages

AbstractLittle information is published related to seed germination and seedling emergence of Japanese foxtail, a troublesome annual grass weed widely distributed in winter wheat fields in China. Three Japanese foxtail populations were studied under laboratory and greenhouse conditions, to determine the effects of different environmental factors on seed germination or seedling emergence. Chemical control is absolutely necessary in integrated management, and efficacy of POST herbicides against different growth stages of Japanese foxtail was evaluated. Germination rate was 90% or more when temperature ranged from 5 to 25 C, with germination onset shortened as temperature increased. Light was not required for germination to occur. For pH values ranging from 5 to10 there was no effect on seed germination. Japanese foxtail seed germination was sensitive to osmotic stress and completely inhibited at an osmotic potential of -1.1 MPa. The ‘1513’ population of Japanese foxtail demonstrated tolerance to soil salinity, with 98% germination at 80 mM NaCl compared with 25 and 40% germination for populations ‘1532’ and ‘1544’, respectively. High amounts of crop residue (10 t ha−1) suppressed Japanese foxtail emergence 38 to 55%. Germination of seeds placed at 160 C for 5 min was completely inhibited for dry seeds, with a similar effect at 130 C for pre-soaked seeds. Seed burial in the soil from 0 to 4 cm had no effect on seedling emergence, but burial at 7 cm completely inhibited seedling emergence. POST herbicides mesosulfuron-methyl (13.5 g ai ha−1), clodinafop-propargyl (67.5 g ai ha−1), pyroxsulam (13.5 g ai ha−1), pinoxaden (67.5 g ai ha−1) and isoproturon (1125 g ai ha−1) reduced plant dry weight 80% or more when applied at three- to seven-leaf stage, but control declined with application at later growth stages. The information from this study helps to develop an integrated approach to Japanese foxtail management.

scholarly journals GIBBERELLIC ACID DURING PRIMING OF PURPLE CONEFLOWER [ECHINACEA PURPUREA (L) MOENCH.] SEEDS IMPROVES GERMINATION AND SEEDLING EMERGENCE

HortScience ◽  
1995 ◽  
Vol 30 (2) ◽  
pp. 186c-186
Author(s):  
Janine O. Haynes ◽  
Wallace G. Pill
Keyword(s):  
Gibberellic Acid ◽  
Germination Rate ◽  
Seedling Emergence ◽  
Dry Weight ◽  
Echinacea Purpurea ◽  
Germination Percentage ◽  
Shoot Dry Weight ◽  
Greenhouse Study ◽  
Purple Coneflower ◽  
Percentage Points

Purple coneflower seeds following priming (-0.04 MPa, 10 days, 15C, darkness) osmotically in polyethylene glycol 8000 (PEG) or matrically in expanded no. 5 vermiculite had greater germination rate and synchrony at continuous 20C or 30C than untreated seeds, but germination percentage was unaffected. Inclusion of 5.5 × 10-2 M gibberellic acid (GA3 as ProGibb Plus 2X, Abbott Laboratories, N. Chicago, Ill.) further improved germination rate and synchrony at 20C, but not at 30C. In a greenhouse study (30C day/27C night, July-August natural light), seeds primed in PEG or vermiculite containing G A3 compared to untreated seeds had 6 percentage points higher maximum emergence (ME), 3.3 fewer days to 50% ME, 1.9 fewer days between 10% and 90% ME, 116% greater shoot dry weight, and 125% longer leaves at 16 days after planting in peat-lite. Inclusion of ethephon (0.01 m, as Florel) either alone or with GA3 during priming provided no benefit to seed germination or seedling emergence. Moistened vermiculite substituted for PEG solution as a priming medium for purple coneflower seeds, the priming benefit on seedling emergence and growth being enhanced by 5.5 × 10-2m G A3 inclusion in the priming media.

scholarly journals Germination and Emergence of Parsley in Response to Osmotic or Matric Seed Priming and Treatment with Gibberellin

HortScience ◽  
2000 ◽  
Vol 35 (5) ◽  
pp. 907-909 ◽  
Author(s):  
Wallace G. Pill ◽  
Elizabeth A. Kilian
Keyword(s):  
Polyethylene Glycol ◽  
Gibberellic Acid ◽  
Seedling Emergence ◽  
Dry Weight ◽  
Seed Priming ◽  
Germination Percentage ◽  
Petroselinum Crispum ◽  
Hypocotyl Length ◽  
Shoot Dry Weight ◽  
Emergence Percentage

`Moss Curled' seeds of parsley (Petroselinum crispum L.) were primed osmotically in polyethylene glycol or matrically in fine, exfoliated vermiculite at –0.5 MPa for 4 or 7 days at 20 or 30 °C with 0 or 1 mm GA3. All priming treatments stimulated and hastened germination. Matric priming resulted in greater germination (89%) than osmotic priming (83%) when seeds were primed for 7 days at 30 °C, but priming agent had no effect on germination percentage following priming at 20 °C or for 4 days. In seeds primed for 4 days at 20 or 30 °C, matric priming hastened germination more than did osmotic priming. Germination was generally less synchronous with matric than with osmotic priming. Increasing priming time from 4 to 7 days increased the rate of germination, but increased germination synchrony only when seeds were primed at 20 °C. Inclusion of 1 mm GA3 during priming had little or no effect on germination. All matric priming treatments (other than 4-day priming) were repeated to assess seedling emergence in a greenhouse (25°C day/22 °C night). Priming increased the percentage, rate and synchrony of emergence, and increased hypocotyl length at 3 weeks after planting. Priming at 30 °C with 1 mm GA3 resulted in the greatest emergence percentage, hypocotyl length, and shoot dry weight. We conclude that matric priming is a satisfactory alternative to osmotic priming of parsley seeds. Chemical name used: gibberellic acid (GA3).

scholarly journals How to account for the uncertainty from standard toxicity tests in species sensitivity distributions: an example in non-target plants

2020 ◽  
Author(s):  
Sandrine Charles ◽  
Dan Wu ◽  
Virginie Ducrot
Keyword(s):  
Seedling Emergence ◽  
Dry Weight ◽  
Credible Interval ◽  
Toxicity Tests ◽  
Point Estimate ◽  
Growth Stages ◽  
Species Sensitivity ◽  
Posterior Probability Distribution ◽  
Shoot Dry Weight ◽  
Point Estimates

AbstractThis research aims to account for the uncertainty on 50% effective rates (ER50) in species sensitivity distribution (SSD) analyses and to study how including this uncertainty may influence the 5% Hazard Rate (HR5) estimation. We explored various endpoints (survival, emergence, shoot dry weight) for non-target plants from seven standard greenhouse studies that used different experimental approaches (vegetative vigour vs. seedling emergence) and applied seven herbicides at different growth stages. Firstly for each endpoint of each study, a three-parameter log-logistic model was fitted to experimental toxicity test data for each species under a Bayesian framework to get a posterior probability distribution for ER50. Then in order to account for the uncertainty on the ER50, we explored two censoring criteria to censor ER50 taking the ER50 distribution and the range of tested rates into account. Based on dose-response fitting results and censoring criteria, we considered input ER50 values SSD analyses in three ways (only point estimates chosen as ER50 medians, interval-censored ER50 based on their 95% credible interval and censored ER50 according to one of the two criteria), by fitting a log-normal distribution under a frequentist framework to get the three corresponding HR5 estimates. We observed that SSD fitted reasonably well when there were at least six distinct ER50 values. By comparing the three SSD curves and the three HR5 estimates, we found that propagating the uncertainty from ER50 and including censored data into the SSD analysis often leads to smaller point estimates of HR5, which is more conservative in a risk assessment context. In addition, we recommend not to focus solely on the point estimate of the HR5, but also to look at the precision of this estimate as depicted by the 95% confidence interval.

scholarly journals In Vitro Screening of Cucmis Melo L. Against Drought Mediated By PEG and Sorbitol

2021 ◽  
Author(s):  
Maryam Nekoee Mehmandar ◽  
Farzad Rasouli ◽  
Mousa Torabi Giglou ◽  
Seyed Morteza Zahedi ◽  
Mohammad Ali Aazami
Keyword(s):  
Antioxidant Enzymes ◽  
Water Deficit ◽  
Photosynthetic Pigments ◽  
Dry Weight ◽  
Growth Stages ◽  
Guaiacol Peroxidase ◽  
Coleoptile Length ◽  
Screening And Identification ◽  
Osmotic Solution

Abstract Water deficit in first growth stages of melon (Cucumis melo L.) in formation of first true leaves after germination can be a factor limiting production. The first step for resolve the problem is genotypes evaluation and identification of drought tolerant melons. An effective method to achieve the goal is use of osmotic solution in tissue culture. Responses of Iranian melon landraces to drought was evaluated using sorbitol at 0.1, 0.2 and 0.4 M or polyethyleneglycol (PEG 6000) at 0.009, 0.012 and 0.015 M concentrations, and MS medium without treatment as the control. Coleoptile length, fresh and dry weight of shoots and roots, photosynthetic pigments, protein, proline, malondialdehyde (MDA) and antioxidant enzymes superoxide dismutase, guaiacol peroxidase and ascorbate peroxidase were measured. The PEG or sorbitol decreased coleoptile length, fresh weight and photosynthetic pigments, and led to enhancement of proline and MDA. Contents of protein and antioxidant enzymes was completely dependent on genotype and type and concentration of osmotic material. The in vitro culture for screening and identification of tolerant and sensitive drought genotypes could be rapid, useful and effective, with sorbitol mimicing drought better than PEG. After in vitro evaluation, the genotype responses to induced water deficit need to be confirmed under field conditions.

scholarly journals The Effect of Halo- and Hydro-Priming on Germination Characteristics of Millet Seeds Under Salinity Stress

2014 ◽  
Vol 47 (2) ◽  
pp. 41-48 ◽  
Author(s):  
M.A. Aghbolaghi ◽  
M. Sedghi
Keyword(s):  
Salinity Stress ◽  
Seedling Emergence ◽  
Dry Weight ◽  
Seed Priming ◽  
Germination Percentage ◽  
Utilization Efficiency ◽  
Seedling Length ◽  
Germination Characteristics ◽  
Normal Seedling ◽  
Four Levels

Abstract Low seed germination and seedling emergence is one of the main problems in saline areas. Seed priming technique has been known as a challenge to improve germination and seedling emergence under different environmental stresses. The objective of this research was to evaluate the effect of seed priming with NaCl and water on growth and seed reserve utilization of millet seeds under salinity stress. Treatments were combinations of four levels of salinity stress (0, ⊟4, ⊟8 and ⊟12 bar) and three levels of seed priming and control with three replicates. Results showed that with increase in salinity stress, germination components such as germination percentage, germination index, mean time to germination, normal seedling percentage, seedling length, seedling dry weight of utilized (mobilized) seed and seed reserve utilization efficiency decreased, but seed priming showed lower reduction. The highest germination characteristics and seed reserve utilization was obtained by halo-priming in control conditions. It is concluded that priming results in improvement in germination components of millet in salinity stress conditions.

Caryopsis dormancy, germination and seedling emergence in sand, of Leymus racemosus (Poaceae), a perennial sand-dune grass inhabiting the Junggar Basin of Xinjiang, China

2004 ◽  
Vol 52 (4) ◽  
pp. 519 ◽  
Author(s):  
Zhenying Huang ◽  
Ming Dong ◽  
Yitzchak Gutterman
Keyword(s):  
Seedling Emergence ◽  
Perennial Grass ◽  
Junggar Basin ◽  
Dry Weight ◽  
Germination Percentage ◽  
Burial Depth ◽  
Physiological Dormancy ◽  
Leymus Racemosus ◽  
Different Depths ◽  
Dune Grass

Leymus racemosus (Lam.) Tzvel. (Poaceae), wild rye, is an endangered, but economically important, perennial grass. It is mainly distributed in the moving or semistabilised sand in deserts of the Junggar Basin in Xinjiang, China. Freshly harvested caryopses are in non-deep physiological dormancy, causing slow and low germination. Six weeks of cold stratification at 5�C is required for the highest germination percentage to be reached at 25–30�C. Scarifying the fruit coat, or artificial removal of different proportions of the endosperm, also increases caryopsis germination. The greater the proportion of the endosperm that was removed, the higher the percentage of germination reached. However, the dry weight of the seedlings and the rate of root and shoot lengthening were significantly influenced by the proportion of the endosperm that remained on the caryopses.The influences of caryopsis size, or of the proportion of remaining endosperm, on germination and seedling emergence from different depths in sand were studied. The percentage of germination was negatively influenced by burial depth, but not by caryopsis size or the proportion of the endosperm that remained. Seedling emergence was negatively related to both burial depth and caryopsis or endosperm sizes. Seedlings from the smallest seeds or from caryopses with 75% endosperm removed did not emerge from 4 cm, and no seedlings from any of the treatments emerged from a depth of 8 cm.

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