Response of Flamboyant seeds (Delonix regia) subjected to different dormancy overcoming methods

2021 ◽  
Vol 14 (3) ◽  
pp. 1-4
Author(s):  
R. R. Rocha ◽  
C. G. B. G. D. Mariussi ◽  
S. N. Silva ◽  
R. Noetzold
Keyword(s):  
Sulfuric Acid ◽  
Experimental Design ◽  
Efficient Method ◽  
Root Length ◽  
Germination Rate ◽  
Hot Water ◽  
The Other ◽  
Seedling Height ◽  
Significant Difference ◽  
Concentrated Sulfuric Acid

Flamboyant has great ornamental use, because it has beautiful flowers, having a great use in urban afforestation and park ornamentation. The seeds have a low germination rate because they have dormancy caused by the impermeability of the integument. In this sense, the objective was to determine the most efficient method to overcome dormancy in flamboyant seeds. The experimental design was fully randomized with 4 treatments and 3 replications. The treatments consisted of: 1-Witness (non-scarified seeds); 2- Hot water at 90º C for 5 minutes; 3- Concentrated sulfuric acid 98% for 60 minutes; 4- Mechanical scarification with sandpaper number 80. The characteristics evaluated were: emergency, emergency speed index, seedling height and root length. A significant difference can be observed in the treatments evaluated only for the emergency speed index where the scarification treatment with sandpaper was higher than the others, for the other characteristics evaluated there was no difference

scholarly journals Germination and Morphology of Sophora secundiflora Seeds Following Scarification

HortScience ◽  
1991 ◽  
Vol 26 (3) ◽  
pp. 256-257 ◽  
Author(s):  
John M. Ruter ◽  
Dewayne L. Ingram
Keyword(s):  
Sulfuric Acid ◽  
Room Temperature ◽  
Germination Rate ◽  
Hot Water ◽  
Scanning Electron Micrographs ◽  
Acid Pretreatment ◽  
Pretreatment Time ◽  
Concentrated Sulfuric Acid ◽  
One Year ◽  
Scanning Electron

Seeds of Sophora secundiflora (Ort.) Lag ex. DC. (mescal bean) were scarified with hot water or concentrated sulfuric acid to determine an optimal pretreatment for successful germination. Scanning electron micrographs indicated that the acid scarification treatment removed the seed cuticle. One-year-old seeds were successfully stored and germinated ≈2 days sooner than from the current year if both were given an acid pretreatment. Germination rate increased as acid pretreatment time increased from 30 to 120 minutes. Soaking seeds in water at room temperature or in hot water (initially 93C) for 24 hours had no effect on germination.

Aptitudes germinatives comparées de graines de Rumex acetosella issues de populations correspondant à des stades distincts d'une succession postculturale

1988 ◽  
Vol 66 (7) ◽  
pp. 1381-1390 ◽  
Author(s):  
J. Escarré ◽  
C. Houssard
Keyword(s):  
Seed Weight ◽  
Plant Biomass ◽  
Germination Rate ◽  
The Other ◽  
Mother Plant ◽  
Old Fields ◽  
Rumex Acetosella ◽  
Significant Difference ◽  
Flowering Rate ◽  
Mother Plants

Germination of Rumex acetosella L. was studied under a variety of experimental conditions to determine whether populations from old fields of different ages (fallow for 6 months to 15 years) differed in seed weight and germination rate and in plant biomass and flowering rate of the resulting plants. Fresh seeds collected from these natural populations showed differences in germination that varied with the date of harvest and the number of years since the field was last cultivated: seeds of the youngest population harvested in July germinated the best and were lighter than those of the other populations. Different fertilizer levels applied during the growth of the mother plants from seeds collected in the original old fields affected the mean weight and the germination rate of the resulting seeds, regardless of the density of cultivation of the mother plant. However, the effect of different fertilizer levels on mean seed weight varied with the origin of each population. Heavy seeds (mean weight > 0.6 mg) of mother plants from the populations of fields abandoned over 2 years ago germinated better than light seeds (mean weight < 0.6 mg). There was no significant difference between heavy and light seeds in terms of percent germination for seeds from mother plants that came from the "youngest" field. These differences in germination rate observed in field-collected seeds were also found in light seeds of the offspring generation: light seeds of the mother plant from the population belonging to the more recently abandoned old field germinated the best. Plants grown from heavy seeds that came from the other populations of older fields had more biomass than those resulting from light seeds. This difference has not been observed between individuals resulting from light and heavy seeds of the youngest population. On the other hand, these individuals had a higher flowering rate than those resulting from the older populations. These results are interpreted in relation to the successional status of the populations: high flowering and early germination rates are suitable characteristics for establishment of plants on bare ground or after a disturbance, whereas heavy seeds with more reserves ensure germination and enough biomass of the resulting plants in density-dependent conditions.

scholarly journals Allelopathic bioactivity of fresh and infused aqueous extracts of Brazilian cherry (Eugenia uniflora L.) on lettuce and maize

2018 ◽  
Vol 40 (1) ◽  
pp. 40972
Author(s):  
Nayara Parisoto Boiago ◽  
Andréa Maria Teixeira Fortes ◽  
Daiane Maria Pilatti ◽  
Paulo Sérgio Siberti da Silva
Keyword(s):  
Experimental Design ◽  
Aqueous Extract ◽  
Root Length ◽  
Germination Rate ◽  
Control Treatment ◽  
Aqueous Extracts ◽  
Initial Development ◽  
Extract Concentration ◽  
Time Index ◽  
Germination Speed

 This study aimed to analyse the allelopathic bioactivity of fresh and infused aqueous extracts of Brazilian cherry leaves on the germination of lettuce and the initial development of maize. Brazilian cherry leaves were used to prepare a fresh aqueous extract (200 g L-1) and an infused extract (100 g L-1), which were diluted to concentrations of 0.4, 0.8, 1.2, 1.6 or 2.0% w/v. The variables evaluated in lettuce were the germination rate (GR), germination time index (GTI), germination speed index (GSI) and root length (RL). To determine the effect on the initial development of maize, we measured the shoot (SL) and root (RL) length. The experimental design included a factorial 2 × 5 design (two extracts and five concentrations), in addition to a control treatment (no extract). In general, the allelopathic bioactivity differed between the fresh and infused extracts. The fresh extract was more phytotoxic for the GR and RL of lettuce. Some beneficial results were observed for the infused extract, including an increase in the RL of lettuce and SL of maize. These effects were dependent on the extract concentration. Thus, there is evidence that Brazilian cherry extracts have allelopathic bioactivity. 

scholarly journals Prematurity Stereotyping: Absence of Evidence (DRAFT 1.DEC2015)

2017 ◽  
Author(s):  
Morteza Ansarinia
Keyword(s):  
Experimental Design ◽  
Motor Coordination ◽  
Ultimatum Game ◽  
Full Term ◽  
The Other ◽  
Physical Size ◽  
Term Birth ◽  
Statistical Interaction ◽  
Significant Difference ◽  
Absence Of Evidence

Forty-seven participants attended an experiment to rate two infants according to their perceived behavior. Half of participants rated in a setting where one infant identified with prematurely born (PL) and the other with full-term birth (FTL). The rest rated with the same configuration, except those labels were swapped for the infants. Results showed not significant difference between PL and FTL for perceived strength, alertness, and physical size. But participants rated FTL infants more positively for motor coordination. Moreover, statistical interaction between two infants when they are presented simultaneously was found and further studies seem necessary to investigate interactions more. A new experimental design to study attitudes via ultimatum game is proposed. In general, previous findings of prematurity stereotyping is replicated partially, but it does not count as an evidence for the rejection of the prematurity stereotyping hypotheses.

scholarly journals Fruit Description and Evaluation of Five Treatments to Break Seed Dormancy of Brownlowia peltata Benth.

2017 ◽  
Vol 3 (4) ◽  
pp. 46
Author(s):  
Arief Noor Rachmadiyanto ◽  
Peniwidiyanti . ◽  
Prima Wahyu Kusuma Hutabarat
Keyword(s):  
Germination Rate ◽  
Water Immersion ◽  
Block Design ◽  
Seed Viability ◽  
Hot Water ◽  
Average Weight ◽  
Physical Dormancy ◽  
Significant Difference ◽  
Different Temperatures ◽  
And Control

<p class="Els-Abstract-text"><em>Brownlowia peltata </em>Benth. is a native tree from Borneo, in its germination problem was physical dormancy due to the hard pericarp of the fruit. The study aimed to evaluate five treatments for breaking the seed physical dormancy and the fruit description. The experiment was using Randomized Complete Block Design (RCBD) with four different temperatures of water immersion, a scarification, and control. The fruit of <em>B. peltata</em> was a woody follicle; belong to yellow green group 148 A in color; 29.64 mm in long; 21.62 mm in thickness; 29.86 mm in wide, with an average weight of 12.05 g. Hot water immersion treatment of 40 °C for 60 s; 60 °C for 60 s and 80 °C for 30 s could raise the fruit moisture content of 0.92 % to 1.04 %. There was a significant difference on germination rate coefficient and coefficient of uniformity of germination among treatments. The mature seed does not have a physical dormancy once the carpel splits and create a slit (fruit opening).</p><div><p class="Els-keywords"><strong>Keywords:</strong> <em>Brownlowia pellata </em>Benth; dormancy; fruit; seed; viability.</p></div>

scholarly journals Methods of overcoming dormancy in seeds and initial development of Black Wattle

2020 ◽  
Vol 42 ◽  
pp. e44
Author(s):  
Ricardo Alberti ◽  
Fernanda Lais Novello ◽  
Eduardo Alexandre Albarello ◽  
Ewerton Jose de Medeiros Torres ◽  
Fernando De Jesus Moreira Junior
Keyword(s):  
Sulfuric Acid ◽  
Aerial Part ◽  
Hot Water ◽  
Forest Nursery ◽  
Acacia Mearnsii ◽  
Initial Development ◽  
Efficient Treatment ◽  
Running Water ◽  
Concentrated Sulfuric Acid ◽  
Black Wattle

The objective of this work was to analyze the efficacy of different methods of dormancy break in seeds of Acacia mearnsii De Wild. The work was performed at the UFSM Botany Lab and Forest Nursery, in Frederico Westphalen, RS. The treatments were: (T1) control; (T2) immersion in hot water (90 °C) for 5 minutes, followed by rest; (T3) immersion in hot water (90 °C) for 10 minutes, followed by rest; (T4) chemical scarification with concentrated sulfuric acid for 3 minutes, followed by washing under running water; (T5) chiseling with concentrated sulfuric acid for 5 minutes, followed by washing under running water. The seeds were sown in plastic trays with Oxisol and vermiculite. The results were submitted to analysis of variance and data were differentiated by Test t with 5% of probability. The most efficient treatment to overcome dormancy was T2, presenting 81.29% of germinated seeds and IVG of 18.23 days for germination. This treatment was also the best for the variables of physical vigor and best performing root length and aerial part, and did not differ from improved treatments for diameter and green mass weight.

scholarly journals Difference in germination rate of Baobab (Adansonia digitata L.) provenances contrasting in their seed morphometrics when pretreated with concentrated sulfuric acid

2015 ◽  
Vol 10 (12) ◽  
pp. 1412-1420 ◽  
Author(s):  
Diouf Macoumba ◽  
Arona Ndiaye Samba Samba ◽  
Arona Ndiaye Samba Samba ◽  
Ndoye Ousmane ◽  
Van Damme Patrick
Keyword(s):  
Sulfuric Acid ◽  
Germination Rate ◽  
Adansonia Digitata ◽  
Concentrated Sulfuric Acid

Indice de maturité et conservation en fonction de la période de récolte des semences d'épinette blanche du Québec

1992 ◽  
Vol 22 (10) ◽  
pp. 1516-1523 ◽  
Author(s):  
Stéphan Mercier ◽  
Charles-Gilles Langlois
Keyword(s):  
Specific Gravity ◽  
Cavity Length ◽  
Germination Rate ◽  
White Spruce ◽  
The Other ◽  
Seed Maturity ◽  
Immature Seeds ◽  
Significant Difference

White spruce cones were harvested weekly to identify the period of maturity of seed and verify the efficiency of some indicators of maturity. The cones were collected in five stations distributed all over Quebec. The results show that the seeds reached maturity about 1 or 2 weeks before scattering. It seems preferable to collect them at this time because their germination rate is better and they maintain good viability after 15 months of stocking. The seed maturity of white spruce in Quebec may be determined by one of the following indices: the embryo reaches 90% of embryo cavity length, cone moisture is 63%, cone specific gravity is 0.99 g/L, or about 80% of cones float in a solution of methanol (d = 0.93 g/L). These indicators have shown that the northernmost station, Les Escoumins, scattered immature seeds. On the other end, the germination rate of seeds present into opened cones drop gradually. However, we did not notice any significant difference between the germination rate of scattered seeds and that of seeds left in opened cones. The effect of seed sorting on the results is also discussed.

scholarly journals Impacts of Microbial Inoculants on the Growth and Yield of Maize Plant

2019 ◽  
Vol 13 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Elizabeth T. Alori ◽  
Olubukola O. Babalola ◽  
Claire Prigent-Combaret
Keyword(s):  
Root Length ◽  
Field Experiments ◽  
The Other ◽  
Growth And Yield ◽  
Soil Types ◽  
Great Promise ◽  
Root Weight ◽  
Microbial Inoculants ◽  
Maize Genotypes ◽  
Significant Difference

Background:The use of microbial inoculants holds a great promise to improve crop yield without the negative environmental and health hazard associated with chemical fertilizer.Aim:To investigate ifPseudomonasspp. (Pseudomonas kilonensisF113 andPseudomonas protegensCHA0 strains) have promoting effects on vegetative growth and yield of different maize genotypes (viz. AFLATOXIN SYN 4W, TZB-SR, AFLATOXIN R SYN 2Y, AFLATOXIN SYN 3W and AFLATOXIN SYN-2Y) under different soil types.Methods:Both pot and field experiments were employed. Bacterialized seeds were sown (2 seeds/pot/stand).Results:Pot experiment showed that both the bacterial species significantly stimulated the growth of maize shoot length, stem girth, leaf length, root length and root weight. The effect of genotypes AFLATOXIN SYN 4W, TZB-SR, AFLATOXIN R SYN 2Y and AFLATOXIN SYN 3W are not significantly different from one another but AFLATOXIN SYN-2Y showed a significantly lower increase in the measured parameters. No significant difference was observed according to soil types. AFLATOXIN SYN 4W showed a significantly higher root weight while AFLATOXIN R SYN 2Y showed a significantly higher root length compared to the other maize genotypes. Moreover,Pseudomonassignificantly increased maize growth and yield under field experiment. AFLATOXIN R SYN 2Y and AFLATOXIN SYN 4W showed a significantly higher yield than the other maize genotypes studied.Conclusion:We concluded thatPseudomonas kilogenensisF113 andPseudomonas protegensCHA0 are potential biofertilizers.

scholarly journals Pematahan Dormansi Benih Kebiul (Caesalphinia bonduc L.) dengan Berbagai Metode

Akta Agrosia ◽  
2016 ◽  
Vol 19 (2) ◽  
pp. 147-156
Author(s):  
Yesi Uyatmi ◽  
Entang Inoriah ◽  
Marwanto Marwanto
Keyword(s):  
Plant Height ◽  
Root Length ◽  
Germination Rate ◽  
Hot Water ◽  
Germination Capacity ◽  
Hard Seed ◽  
Randomized Design ◽  
Breaking Dormancy ◽  
Different Temperatures ◽  
Hard Seed Coat

Seed of Caesalpinia bonduc L. is difficult to germinate due to the thick and hard seed coat. The research aims to evaluate various methods for breaking dormancy of C. bonduc seed. This study was conducted from December to January 2016 The way to break the dormancy were arranged in Completely Randomized Design. Eleven methods to solve the seed dormancy of C. bonduc were compared. The ways to break the dormancy were soaking in water with different temperatures. The temperatures were 30C for 0 hours, 5 hours, 10 hours, and 15 hours. Other techniques to break the dormancy were soaking in hot water at 10000C for 5 hours, 10 hours, and 15 hours. Warm stratification with 100% air humidity (RH) at 40C for five days, ten days and 15 days also included as treatments. The last method was seed piercing with a needle. The variables observed in this study were germination capacity, germination rate, epicotyl length, plant height, and root length. The results of this study showed that the 11 methods of breaking seed dorman cy significantly affected germination capacity, germination rate, emerging epicotyl, and plant height. Seed piercing classified as the most efficient method as indicated by the value of 100% in germination capacity, 1.43 in germination rate, 13.64 cm in plant height, and 6.16 cm in root length.0

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