scholarly journals Study of the allelopathic effects of Medicago sativa on the germination characteristics of Secale montanum

2021 ◽  
Vol 78 (2) ◽  
pp. 34
Author(s):  
Esmaeil NABIZADEH ◽  
Mahdieh MEMARI ◽  
Khadijeh AHMADI
Keyword(s):  
Medicago Sativa ◽  
Dry Weight ◽  
Initial Growth ◽  
Allelopathic Potential ◽  
Aerial Parts ◽  
Agricultural College ◽  
Germination Characteristics ◽  
Medicago Sativa L ◽  
Allelopathic Effects ◽  
Secale Montanum

This study investigated the allelopathic effects of Medicago sativa L. on the germination characteristics of weed rye (Secale montanum L.) Guss. In order to study the allelopathic effects of different concentrations of aqueous extract (0, 10, 20 and 30%) of different M. sativa parts (root, leaves, stem and aerial parts of the plant including (stems, leaves and flowers) on initial growth of rye (S. montanum) seedlings a factorial experiment arranged in RCB design was carried out with three replications in the greenhouse of Agricultural College, Mahabad Islamic Azad University in 2017. The greenhouse data showed that the plant height, root and biomass dry weight of the weed decreased so that the declining trend had a significant effect (p≤0.05) on all traits of rye studied in the present experiment. Among the aqueous extracts of M. sativa that of the root had the greatest allelopathic potential. 

The influence of the lucerne bud mite (Eriophyes medicaginis Keifer) on the growth of lucerne

1981 ◽  
Vol 32 (5) ◽  
pp. 773 ◽  
Author(s):  
PM Ridland ◽  
GM Halloran
Keyword(s):  
Medicago Sativa ◽  
Dry Weight ◽  
Stem Length ◽  
Infestation Level ◽  
Axillary Shoots ◽  
Two Temperatures ◽  
Medicago Sativa L ◽  
Extent Of Damage ◽  
Initial Infestation ◽  
Damage Symptoms

The influence of Eriophyes medicaginis on the growth of lucerne (Medicago sativa L.) was studied at four temperatures (15, 20, 25 and 29�C) at an initial infestation level of 10 mites per seedling, and at two temperatures (20 and 29�C) with four initial levels of infestation (2, 5, 10 and 20 mites per seedling). At 25� and 29�C, infestation with 10 mites per seedling significantly reduced dry weight of tops, stem length and the development of axillary shoots within 22 days of infestation. In this period, the numbers of mites increased 16-fold at 29OC, ninefold at 25�C and sixfold at 20�C, but there was no increase at 15�C. The extent of damage caused by mites at 20�C appeared to vary with the differences in growth of the plants under different photoperiods. Under a short photoperiod (10.3 h) where no axillary shoots developed on either infested or control plants, the extent of damage due to mite infestation was much higher than under a longer photoperiod (13.2 h) where axillary shoots developed on all seedlings. Damage symptoms on leaves of infested plants included chlorotic patches (mainly at 20� and 25�C), agate-like banding (29�C) and a waxy mottle (15�C).

Zahnic acid tridesmoside and other dominant saponins from alfalfa (Medicago sativa L.) aerial parts

1992 ◽  
Vol 40 (2) ◽  
pp. 191-196 ◽  
Author(s):  
Wieslaw. Oleszek ◽  
Marian. Jurzysta ◽  
Michal. Ploszynski ◽  
Ian J. Colquhoun ◽  
Keith R. Price ◽  
...  
Keyword(s):  
Medicago Sativa ◽  
Aerial Parts ◽  
Medicago Sativa L

EFFET DU MAGNÉSIUM ET DU pH DU SOL SUR LA LUZERNE CULTIVÉE EN SERRE DANS TROIS TYPES DE SOL DU QUÉBEC

1980 ◽  
Vol 60 (2) ◽  
pp. 275-284 ◽  
Author(s):  
J. L. DIONNE
Keyword(s):  
Medicago Sativa ◽  
Soil Ph ◽  
Dry Weight ◽  
Weight Basis ◽  
Soil Types ◽  
Yield Increase ◽  
Medicago Sativa L ◽  
Mg Content

Aflalfa (Medicago sativa L. ’Saranac’) was grown under greenhouse conditions in order to determine changes in magnesium (Mg) response and availability following variation in soil pH. The rates of Mg applications were 0, 25, 50, 100 and 200 ppm of Mg calculated on soil dry weight basis. Soil pH was adjusted to 5.0 (or original) 6.0, 6.5 and 7.5. A 40% yield increase was recorded on Greensboro loam following Mg fertilization. The increase in yields due to Mg was 23% on the two others soil types. The Mg contents of plant and soil increased with rate of Mg applied to soil. In general, the response of alfalfa was increased by liming soils and the Mg content of alfalfa was decreased. The availability of Mg in soils was also lowered by liming. The Mg requirement of soils varied from 25 to 100 ppm depending upon pH and soil types.

Effect of silicon on the morphology of shoots and roots of alfalfa (Medicago sativa)

2006 ◽  
Vol 46 (9) ◽  
pp. 1161 ◽  
Author(s):  
Z. G. Guo ◽  
H. X. Liu ◽  
F. P. Tian ◽  
Z. H. Zhang ◽  
S. M. Wang
Keyword(s):  
Medicago Sativa ◽  
Root Biomass ◽  
Dry Weight ◽  
Reproductive Period ◽  
Forage Yield ◽  
Root Volume ◽  
Top Soil ◽  
Medicago Sativa L ◽  
Si Content ◽  
Secondary Roots

A silicon (Si)-deficient top soil was used in a pot experiment to investigate the effect of Si application on the shoot and root morphology of alfalfa (Medicago sativa L.). Silicon was applied to the alfalfa plants at 6 different rates (0, 0.025, 0.05, 0.10, 0.20, 0.30 g/kg), and each treatment was replicated 6 times. This study indicated that the Si content of roots and shoots increased significantly (P<0.05) with increasing Si concentration in the soil, and that the Si content of roots was greater than that of shoots. Plants treated with Si had increased leaf area, height, forage yield and shoots per plant during the reproductive period in comparison with controls. The application of Si also increased root volume, the number of secondary roots and root biomass. The effects of Si application were greater on roots than on shoots. The ratio of shoot to root dry weight was below 1.62 when Si was applied to plants and 1.91 without Si application. Overall, overcoming available Si deficiency resulted in a significant increase in shoot and root growth.

scholarly journals Effect of Salinity on Nodulation, Glutamine Synthetase and Glutamate Synthase Activity in Nodules of Alfalfa (Medicago sativa L.)

2015 ◽  
Vol 48 (4) ◽  
pp. 61-70
Author(s):  
O. Younesi ◽  
A. Moradi
Keyword(s):  
Glutamine Synthetase ◽  
Medicago Sativa ◽  
Sinorhizobium Meliloti ◽  
Glutamate Synthase ◽  
Dry Weight ◽  
Ammonium Assimilation ◽  
Solution Culture ◽  
Saline Stress ◽  
Medicago Sativa L ◽  
Growth Analyses

Abstract Bami cultivar of alfalfa (Medicago sativa) was inoculated with salt-tolerant Sinorhizobium meliloti in solution culture with different salt concentrations (0, 50, 75 and 100 mmoles 1-1NaCl) added immediately at the time of inoculation. The results indicated that S. meliloti formed an infective and effective symbiosis with alfalfa under saline and nonsaline conditions. Salinity significantly decreased shoot and root dry weight, nodule weight and mean nodule weight. Roots were more sensitive than shoots, and N2 fixation was more sensitive to salinity than was plant growth. Analyses of ammonium assimilating enzymes in the nodule showed that glutamine synthetase appeared to be more tolerant to salinity than glutamate synthase, and that it limits ammonium assimilation under saline stress.

scholarly journals STUDI ALELOPATI Wedelia trilobata, Ageratum conyzoides, Chromolaena odorata DAN Mikania micrantha TERHADAP PERTUMBUHAN DAN HASIL SAWI

2017 ◽  
Author(s):  
Donly Avrin Togatorop ◽  
Nanik Setyowati ◽  
Uswatun Nurjanah
Keyword(s):  
Dry Weight ◽  
Growth And Yield ◽  
Chromolaena Odorata ◽  
Weed Species ◽  
Ageratum Conyzoides ◽  
Allelopathic Potential ◽  
Mikania Micrantha ◽  
Wedelia Trilobata ◽  
Mustard Seedling ◽  
Allelopathic Effects

Status: PostprintVarious results of researches report that daisy Creeping Daisy (Wedelia trilobata), Goat weed (Ageratum conyzoides), Siam weed (Chromolaena odorata) and Bittervine (Mikania micrantha) have alellopathic potency to innhibit germination, growth and plant yield.. There were few researches on allelopathic potential of Creeping Daisy, Goat weed, Siam weed and Bittervine on mustard. Therefore, an experiment to evaluate the the allelopathic effects of those weeds on growth and yield of mustard at different concentrations is necessary to be conducted. The purpose of the research was to determine the allelopathic effects of Creeping Daisy, Goat weed, Siam weed and Bittervine on the germination of mustard. The Experiment was conducted from November 2008 until January 2009 at Agronomy Laboratory, University of Bengkulu using Randomized Complete Design (RCD). The experiment consisted of four weed species namely Creeping Daisy, Goat weed, Siam weed and Bittervine and five allelopathic concentrations 10, 20,30, 40 and 50 g/L. The results showed that Siam weed suppressed mustard germination more than other weeds. Allelopathic of Siam weed suppressed shoot length and root length of mustard seedling as much as 42.63% and 45.15% respectively. Shoot and root fresh weight and shoot dry weight of mustard seedling were suppressed as much as 28,23%,56,16% and 56,7% respectively The concentration of 50 g/L extracts from Goat weed andSiam weed was the most toxic to the germination of mustard.

Root and crown characteristics of alfalfas varying in fall dormancy

1994 ◽  
Vol 74 (1) ◽  
pp. 125-127 ◽  
Author(s):  
N. A. Juan ◽  
C. C. Sheaffer ◽  
D. K. Barnes
Keyword(s):  
Medicago Sativa ◽  
Key Words ◽  
Dry Weight ◽  
Nonstructural Carbohydrate ◽  
Shoot Number ◽  
Fall Dormancy ◽  
Crown Morphology ◽  
Medicago Sativa L ◽  
Crown Characteristics ◽  
Alfalfa Root

We compared root and crown characteristics of five alfalfa (Medicago sativa L.) entries which differed in fall dormancy. Alfalfas were subjected to bud or mid-bloom harvests. The most consistent entry effect occurred for root and crown dry weight and root total nonstructural carbohydrate (TNC) concentrations. Root TNC concentration was highest and root and crown weight were greatest for the nondormant and least in the most dormant entries. Entries did not consistently differ in crown bud numbers, shoot number, or shoot origin. In October, the number of elongated crown buds were greater for a non-fall dormant alfalfa Nitro than for the most fall dormant alfalfa. Key words: Alfalfa, root and crown morphology, fall dormancy, root carbohydrates

scholarly journals Allelopathic Potential of Aqueous Extract from Acacia melanoxylon R. Br. on Lactuca sativa

Plants ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1228
Author(s):  
M. Iftikhar Hussain ◽  
Mohamed A. El-Sheikh ◽  
Manuel J. Reigosa
Keyword(s):  
Phenolic Compounds ◽  
Aqueous Extract ◽  
Lactuca Sativa ◽  
Plant Biomass ◽  
Dry Weight ◽  
Fresh Weight ◽  
Allelopathic Potential ◽  
Acacia Melanoxylon ◽  
Root Dry Weight ◽  
Allelopathic Effects

We studied the polyphenol (phenolic compounds and flavonoids) composition and allelopathic effects of Acacia melanoxylon R. Br. aerial foliage aqueous extract (0%, 25%, 50%, 75% and 100%) on the seedling growth and plant biomass of the general biotest species, lettuce (Lactuca sativa). Mean leaf fresh weight, leaf dry weight, root fresh weight and root dry weight were decreased following exposure to Acacia aerial foliage, flowers aqueous extract (AFE) and phyllodes aqueous extract (APE) after 6 days. The reduction in plant dry biomass was more than 50% following treatment with AFE. The decrease in mean root length was approximately 37.7% and 29.20% following treatment with Acacia flowers extract (AFE) at 75% and 100% concentration, respectively. Root dry weight of L. sativa was reduced by both flowers and phyllodes extract. The reduction of protein contents in lettuce leaves following Acacia foliage extract proved that both AFE and APE exhibit polyphenols that causes the toxicity which led to decrease in leaf protein contents. High-Performance Liquid Chromatography (HPLC) was employed to analyze the A. melanoxylon flowers and phyllodes. A total of 13 compounds (accounting for most abundant compounds in flowers and phyllodes) include different flavonoids and phenolic compounds. The phytochemical compounds detected were: Gallic acid, protocatechuic acid, p-hydroxybenzoic acid, p-hydroxybenzaldehyde, vanillic acid, syringic acid, p-coumaric acid, and ferulic acid. The major flavonoid compounds identified include rutin, luteolin, apigenin, and catechin. Allelopathic effects of flower and phyllodes extracts from A. melanoxylon may be due to the presence of above compounds identified by HPLC analysis.

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