Distribution and Interference of Common Milkweed (Asclepias syriaca) in Nebraska

Weed Science ◽  
1982 ◽  
Vol 30 (4) ◽  
pp. 385-388 ◽  
Author(s):  
Gary L. Cramer ◽  
Orvin C. Burnside
Keyword(s):  
Avena Sativa ◽  
Crop Yields ◽  
Germination Percentage ◽  
Growth Media ◽  
Aqueous Extracts ◽  
Fallow Land ◽  
Asclepias Syriaca ◽  
Hypocotyl Length ◽  
Growing Medium ◽  
Radicle Length

Infestations of common milkweed (Asclepias syriacaL.), in descending order of incidence in Nebraska, occurred on areas occupied by soybean [Glycine max(L.) Merr.], oats (Avena sativaL.), sorghum [Sorghum bicolor(L.) Moench.], railroad rights-of-way, fallow land, roadsides, corn (Zea maysL.), winter wheat (Triticum aestivumL.), pasture, and alfalfa (Medicago sativaL.). Average crop yield reductions, within common milkweed communities of 11100 to 45 200 plants/ha, ranged from 2 to 10% for corn, 4 to 29% for sorghum, and 12 to 19% for soybeans. Reductions in crop yields tended to increase with increasing common milkweed populations. Germination percentage of common milkweed and sorghum were not significantly affected by growing medium conductivities below 7 and 13 mmho/cm2, respectively. Growth media at pH 2 significantly reduced germination percentage, hypocotyl length, and radicle length of both common milkweed and sorghum as compared with pH 4 to 10. Undiluted aqueous extracts of common milkweed shoot and root material significantly reduced germination percentage, hypocotyl length, and radicle length of sorghum.

scholarly journals ALLELOPATHIC POTENTIAL OF AQUEOUS EXTRACT OF LEAF AND ROOT SESAME ON SICKLEPOD AND BRACHIARIA SEEDS

2021 ◽  
Vol 15 (4) ◽  
pp. 523-537
Author(s):  
Gustavo Ferreira da Silva ◽  
Nilbe Carla Mapeli ◽  
Cassiano Cremon ◽  
Larissa Chamma ◽  
Bruno Cesar Ottoboni Luperini ◽  
...  
Keyword(s):  
Leaf Extract ◽  
Germination Percentage ◽  
Control Measures ◽  
Brachiaria Brizantha ◽  
Hypocotyl Length ◽  
Lower Growth ◽  
Allelopathic Potential ◽  
Ecological Importance ◽  
And Control ◽  
Radicle Length

Sicklepod is an important weed in Brazil pastures, but control measures are not yet effective. Thus, allelopathy can be an alternative, due to its ecological importance and for being able to provide new structures sources for agrochemicals production. This research aimed to verify the allelopathic potential of sesame (Sesamum indicum L.) on germination and seedling development of sicklepod (Senna occidentalis L.) and brachiaria (Brachiaria brizantha). The treatments were root and leaf extract of sesame, and control (distilled water).  Germination percentage, speed of germination, hypocotyl and radicle length were evaluated. Speed of germination, germination percentage and radicle length had no interference from the aqueous extracts. However, in brachiaria these traits had lower values than sicklepod. Hypocotyl length was not influenced by the extracts, however, the leaf extract showed lower growth of this feature. Allelopathy did not affect germination and speed of germination in both species, but interfered in brachiaria development.

Development of an embryo germination protocol for shy-seeded grape (Vitis vinifera L.)

2021 ◽  
pp. 1-9
Author(s):  
Ashwini P. Benke ◽  
Ram Krishna ◽  
Roshni R. Samarth ◽  
Shweta S. Dhumal ◽  
Waquar A. Ansari ◽  
...  
Keyword(s):  
Developmental Stages ◽  
Germination Rate ◽  
Germination Percentage ◽  
Vitis Vinifera L ◽  
Growth Media ◽  
Embryo Germination ◽  
Indole Butyric Acid ◽  
Grape Berries ◽  
Benzyl Amino Purine

Abstract Acquisition and germination of seeds are the most desired targets for the improvement of vegetatively propagated crops. In the present study, we developed a potential embryo germination protocol for the Red Globe grape cultivar having a low seed germination rate. Three grape berries at different developmental stages, viz. 50, 60 and 70 days after flowering (DAF), were selected for in-vitro embryo germination. Three growth media, namely Emershad and Ramming (ER), Nitsch and Nitsch (NN) and Murashige and Skoog (MS), and plant growth regulators (benzyl amino purine (BA), 0.5, 0.7 and 0.9 mg/l; indole butyric acid (IBA), 1.0, 1.5 and 2.0 mg/l; and gibberellic acid (GA), 0.1, 0.3 and 0.9 mg/l) were screened individually in different combinations with three amino acids, namely cysteine, glutamine and proline (2.0 μmol/l each). The maximum embryos germination percentage recorded at 70 DAF was 63.33, 47.78 and 45.56% in ER, NN and MS media, respectively, supplemented with 0.9 mg/l BA, 2.0 mg/l IBA, 0.9 mg/l GA and 2.0 μmol glutamine. Glutamine was found to have the most significant impact, and it improved the rescued embryos germination. The present study provides a potential recipe for a medium that can facilitate efficient germination of grape embryos.

Assessing allelopathic potential of Sonchus oleraceus L. (milk thistle) on germination and seedling growth of Oryza puncta

2021 ◽  
Vol 27 (1) ◽  
pp. 1-12
Author(s):  
Bilal Ahmad Khan ◽  
Saima Anwar ◽  
Rizwan Maqbool Maqbool ◽  
Muhammad Mohsin Amin ◽  
Muhammad Mansoor Javaid ◽  
...  
Keyword(s):  
Aqueous Extract ◽  
Seedling Growth ◽  
Dry Weight ◽  
Germination Percentage ◽  
Aqueous Extracts ◽  
Emergence Time ◽  
Fresh Weight ◽  
Water Control ◽  
Sonchus Oleraceus ◽  
Oryza Punctata

ABSTRACT Aqueous extracts of plants are used to control weeds and having no hazards to environment and are inexpensive. Present study was undertaken to investigate the effect of aqueous extracts of Sonchus oleraceus L. on the Oryza punctata L. emergence and initial seedling growth. It consists of aqueous extract of leaves, stem and fruit of S. oleraceus at varying concentrations 0.25, 0.50, 1, 2, 4 and 8 % (w/v) along with a distilled water control. The allelochemicals present in the aqueous extracts showed stimulatory, inhibitory and hormetic responses depending upon the concentration and the plant part. Results directed that maximum mean emergence time (5.26 days) and minimum germination index (1.67), germination percentage (40%), seedling fresh weight (59 g) and dry weight (8 g) of O. punctata were examined with 8% aqueous extract of S. oleraceus fruit. However, 4% aqueous extract of S. oleraceus fruit produced minimum root length (5.71). On the basis this experiment it was concluded that 8% aqueous extract of S. oleraceus fruit can be used for controlling O. punctata weed. Keywords: Aqueous extract, environment, allelochamicals, hermetic response, stimulatory ABSTRACT Aqueous extracts of plants are used to control weeds and having no hazards to environment and are inexpensive. Present study was undertaken to investigate the effect of aqueous extracts of Sonchus oleraceus L. on the Oryza punctata L. emergence and initial seedling growth. It consists of aqueous extract of leaves, stem and fruit of S. oleraceus at varying concentrations 0.25, 0.50, 1, 2, 4 and 8 % (w/v) along with a distilled water control. The allelochemicals present in the aqueous extracts showed stimulatory, inhibitory and hormetic responses depending upon the concentration and the plant part. Results directed that maximum mean emergence time (5.26 days) and minimum germination index (1.67), germination percentage (40%), seedling fresh weight (59 g) and dry weight (8 g) of O. punctata were examined with 8% aqueous extract of S. oleraceus fruit. However, 4% aqueous extract of S. oleraceus fruit produced minimum root length (5.71). On the basis this experiment it was concluded that 8% aqueous extract of S. oleraceus fruit can be used for controlling O. punctata weed. Keywords: Aqueous extract, environment, allelochamicals, hermetic response, stimulatory ABSTRACT Aqueous extracts of plants are used to control weeds and having no hazards to environment and are inexpensive. Present study was undertaken to investigate the effect of aqueous extracts of Sonchus oleraceus L. on the Oryza punctata L. emergence and initial seedling growth. It consists of aqueous extract of leaves, stem and fruit of S. oleraceus at varying concentrations 0.25, 0.50, 1, 2, 4 and 8 % (w/v) along with a distilled water control. The allelochemicals present in the aqueous extracts showed stimulatory, inhibitory and hormetic responses depending upon the concentration and the plant part. Results directed that maximum mean emergence time (5.26 days) and minimum germination index (1.67), germination percentage (40%), seedling fresh weight (59 g) and dry weight (8 g) of O. punctata were examined with 8% aqueous extract of S. oleraceus fruit. However, 4% aqueous extract of S. oleraceus fruit produced minimum root length (5.71). On the basis this experiment it was concluded that 8% aqueous extract of S. oleraceus fruit can be used for controlling O. punctata weed. Keywords: Aqueous extract, environment, allelochamicals, hermetic response, stimulatory

scholarly journals Application of Trichoderma harzianum on the physiological quality of cowpea seeds

2021 ◽  
pp. 643-648
Author(s):  
Marcelo Laranjeira Pimentel ◽  
Henara Valéria Miranda Castro ◽  
Mike Kirixi Munduruku ◽  
Larissa Conceição Cunha Ponte ◽  
Deyvielen Maria Ramos Alves ◽  
...  
Keyword(s):  
Trichoderma Harzianum ◽  
Seed Treatment ◽  
Germination Percentage ◽  
Hypocotyl Length ◽  
Cowpea Seeds ◽  
Randomized Design ◽  
Germination Speed ◽  
Physiological Quality ◽  
Set Up

The use of fungi in seed treatment can improve the plant's physiological characteristics. The aim of this study was to evaluate the influence of the use of Trichoderma harzianum on the physiological quality of bean seeds. The experiment was set up and conducted in the forest seed laboratory of the Federal University of Western Para, in a randomized design, using 4 procedures on the basis of a colony forming unit (CFU): T1 (0 CFU), T2 (4 x 109 CFU), T3 (8 x 109 CFU) and T4 (12 x 109 CFU), with 5 repetitions. Germination percentage (G%), germination speed index (GSI), hypocotyl length (HL) and radicle length (RL) were evaluated as variables. The data were analyzed by variance analysis and the averages were compared using the Tukey test (p≤0.05), in addition to the regression analysis, using the Minitab© version 18 statistical software. There were differences between the germination percentage tests, in which T2 obtained 100% of germinated seeds, for GSI it was observed that T2 and T3 were equal and superior to the other treatments, while for RL T1 and T2 obtained the best results, however, for HL there were no statistical differences between treatments. T2 was more efficient in the physiological quality of seeds to germination percentage and germination speed index

scholarly journals Barley Residues Allelopathic Effects on Corn Seed Germination and Seedlings Growth

2019 ◽  
Vol 52 (1) ◽  
pp. 26-33
Author(s):  
M. Khoshkharam ◽  
W. Sun ◽  
Q. Cheng ◽  
M.H. Shahrajabian
Keyword(s):  
Germination Rate ◽  
Germination Percentage ◽  
Control Treatment ◽  
Coleoptile Length ◽  
Plant Organs ◽  
Corn Seed ◽  
Randomized Design ◽  
Stem Extract ◽  
Four Levels ◽  
Radicle Length

Abstract Allelopathy is the detrimental effect of one crop on germination or development of a plant of another species. A factorial layout within completely randomized design with four replications was used to survey the influence of barley extract on corn seeds. Treatments included plant organs extract (leaf, stem, root and total), and different barley extract densities (Nosrat cultivar) includes four levels of 0%, 25%, 50% and 100%. The influence of barley extract was significant on coleoptile weight, radicle weight, radicle length and coleoptile length. Plant organs had meaningful effect on germination rate, germination percentage, coleoptile weight, radicle weight, radicle length and coleoptile length. Among all experimental characteristics, coleoptiles length was influenced by interaction between barley extract and plant organ. Although, the highest germination rate and germination percentage was related to 25% and 100% of barley extract density, the maximum coleoptile weight, radicle weight, radicle length and coleoptiles length was related to control treatment (0%). Leaf extract has obtained the higher values of germination rate, germination percentage, coleoptile weight, radicle weight, radicle length and coleoptile length. Interaction between control treatment (0% plant extract) and stem extract had obtained the highest coleoptiles weight, radicle weight, radicle length and coleoptile length. Hence, from the obtained results, it can be concluded that the extracts of barley may have allelopathic influence on germination and seedling growth of corn.

scholarly journals Comparison of allelopathic effects of some brassica species in two growth stages on germination and growth of sunflower

2011 ◽  
Vol 57 (No. 2) ◽  
pp. 52-56 ◽  
Author(s):  
E. Jafariehyazdi ◽  
F. Javidfar
Keyword(s):  
Germination Rate ◽  
Growth Stages ◽  
Distilled Water ◽  
Aqueous Extracts ◽  
Hypocotyl Length ◽  
Allelopathic Potential ◽  
Brassica Spp ◽  
Full Flowering ◽  
Significant Difference ◽  
Two Stages

Members of Brassicaceae have been frequently cited as allelopathic crop. The toxic effect of Brassica spp. may be caused by hydrolysis products of glucosinolates that occur in substantial amounts in the vegetative parts of Brassica spp. This study investigated the allelopathic potential of Brassica napus, B. rapa and B. juncea on the sunflower seed germination and seedling growth. Aqueous extracts of three species from two stages (full flowering and straw) of sampling were separately made with 0 (distilled water), 10, 20, 30 and 40% concentrations. This experiment was conducted in 2 × 3 × 5 factorial arrangement based on completely randomized design with five replications. There was a highly significant difference among different concentrations of extracts and also between two stages of extraction. All aqueous extracts significantly affected sunflower germination, germination rate, seedling root and hypocotyl length, fresh and dry matter weight when compared with distilled water control. The greatest concentration showed a stronger inhibitory effect. Root length was more sensitive to extracts than hypocotyl length.

Influence of size of achenes sown and depth of sowing on growth and yield of dryland oilseed sunflowers (Helianthus annuus) on the Darling Downs

1977 ◽  
Vol 17 (86) ◽  
pp. 489 ◽  
Author(s):  
BJ Radford
Keyword(s):  
Helianthus Annuus ◽  
Plant Density ◽  
Germination Percentage ◽  
Growth And Yield ◽  
Hypocotyl Length ◽  
Plant Populations ◽  
Delayed Emergence ◽  
Development Processes ◽  
Mean Size ◽  
Emergence Percentage

Large achenes of sunflower (Helianthus annuus) exhibited a slightly higher germination percentage and greater mean hypocotyl length than small achenes, resulting in a higher field emergence percentage at sowing depths exceeding 6 cm. Size of achenes sown had no effect on achene yield, provided plant populations from large and small achenes were equal. Plants grown from small achenes produced achenes of higher kernel percentage in both seasons, resulting in higher protein percentage in one season and higher oil percentage in the other. Performance of ungraded achenes was equal to that of graded achenes of the same mean size. Deep sowing reduced emergence percentage considerably, especially when small achenes were sown, but the effect of deep sowing on growth and yield was confounded with effects of reduced plant density (because of reduced emergence) and effects of delayed emergence causing slightly later timing of growth and development processes in relation to environmental factors.

scholarly journals In vitro allelopathic effect of aqueous extracts of sugarcane on germination parameters of wheat

2017 ◽  
Vol 109 (2) ◽  
pp. 349 ◽  
Author(s):  
Abdul Majeed ◽  
Zahir MUHAMMAD ◽  
Manzoor HUSSAIN ◽  
Habib AHMAD
Keyword(s):  
Germination Percentage ◽  
Allelopathic Effect ◽  
Aqueous Extracts ◽  
Wheat Growth ◽  
Plant Parts ◽  
Seedling Biomass ◽  
Mean Germination Time ◽  
Germination Indices ◽  
Germination Parameters

Allelopathy – interactions among plants for resources along with competition – is a composite phenomenon which has spacious potentials of application in agriculture. Understanding of interactions among plants, particularly cultivated crops, may be helpful in modifying crop cultivation pattern with consequent yields increments. In this study, we investigated the allelopathic effects of aqueous extracts of root, stem peels and leaves of sugarcane (<em>Saccharum officinale</em> L.) cultivar <em>51</em> at concentrations 0, 2.5, 5.0, 7.5 and 10.0 g/l on germination indices and seedling biomass of wheat (<em>Triticum aestivum </em>L.) cultivar <em>Pirsabak-2005</em>. Results demonstrated that higher concentration (10.0 g/l) of extracts of root, stem peels and leaves significantly decreased mean germination time (MGT) but increased shoot and seminal root growth and seedling dry biomass; however, germination percentage was affected neither by extract concentration nor by plant parts used in the study. Extract concentrations up to 7.5 g/l had no effect on the studied parameters of wheat. Our result suggests that sugarcane’s allelopathy demonstrates healthy effects on wheat growth and that wheat could be cultivated in sequential rotation in field conditions.

scholarly journals Effects of aqueous plant extracts and inorganic fertilizer on the germination, growth and development of maize (Zea mays L.)

2014 ◽  
Vol 59 (3) ◽  
pp. 243-254 ◽  
Author(s):  
Kanayo Chukwuka ◽  
Maxwell Obiakara ◽  
Israel Ogunsumi
Keyword(s):  
Plant Extracts ◽  
Growth And Development ◽  
Tap Water ◽  
Germination Percentage ◽  
Distilled Water ◽  
Aqueous Extracts ◽  
Radicle Growth ◽  
Randomized Design ◽  
Npk Fertilizer ◽  
Completely Randomized Design

Screen house experiments were carried out to examine the effects of aqueous leaf extracts of Tithonia diversifolia (Ti) and Vernonia amygdalina (Ve), as well as NPK fertilizer (15-15-15) on the germination, growth and development of maize. Fresh leaves were collected, washed with tap water, chopped and pounded, soaked in distilled water and filtered. The two filtrates were used to prepare extracts at 50 and 100% w/v. Four maize seeds were placed in Petri dishes laid out in a completely randomized design with five replicates. In every Petri dish 10 ml of extract per treatment was added. A control experiment with distilled water was also set up. Also, in a completely randomized design with four replicates, 4-week-old potted maize plants were treated with 500 ml of each extract as well as with 1.52 g of NPK fertilizer. The results showed that the germination percentage of the seeds followed the order Ti50 - Control - Ve50. The seeds treated with aqueous extracts of T. diversifolia and V. amygdalina at 100% w/v produced lower but equal germination percentage. The seedling radicle growth was significantly inhibited by the aqueous extracts of Ti100, Ve50 and Ve100 (p?0.05). The inhibition was dose-dependent and more pronounced in seeds treated with extracts of V. amygdalina. The aqueous extract of T. diversifolia (50% w/v) and control influenced radicle growth substantially. All the extracts inhibited the plumule development compared to the control. On the other hand, growth, development and yield were not significantly affected by the plant extracts.

GERMINATION, GROWTH AND DEVELOPMENT OF COMMON MILKWEED

1978 ◽  
Vol 58 (2) ◽  
pp. 493-498 ◽  
Author(s):  
PRASANTA C. BHOWMIK
Keyword(s):  
Lateral Roots ◽  
Seedling Emergence ◽  
Primary Root ◽  
Germination Percentage ◽  
Asclepias Syriaca ◽  
Seed Collection ◽  
Primary Roots ◽  
Number Of Leaves ◽  
Primary Root Length ◽  
Storage Temperatures

Germination percentage of common milkweed (Asclepias syriaca L.) seeds was low 1 mo after seed collection. Seed dormancy decreased with time at storage temperatures of −12°, 5° or 21 °C. After 11 months of storage, seeds stored at 21 °C had 15–18% higher germination compared to the seeds stored at −12° and 5 °C. The best seedling emergence was obtained at a temperature of 27 °C when seeds were planted at a depth of 0.5 or 1 cm. Seedling emergence was better in muck or sandy soil than in clay soil. Seedlings developed slowly up to 30 days after emergence at 15 °C under an 8-, 12- or 16-h photoperiod. High temperatures (27 °C) stimulated seedling growth under each photoperiod. Taller seedlings with more leaves, longer primary roots, more lateral roots and adventitious root buds grew at 27 °C as compared to 15° or 21 °C. Increasing the photoperiod from 8 to 16 h increased plant height and number of leaves but not primary root length.

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