Variations in rooting ability of cuttings and in seed characteristics of five populations of Juniperus communis var. depressa from subarctic Quebec

1994 ◽  
Vol 72 (4) ◽  
pp. 493-498 ◽  
Author(s):  
Gilles Houle ◽  
Patrice Babeux
Keyword(s):  
Butyric Acid ◽  
Seed Quality ◽  
Seed Mass ◽  
Hudson Bay ◽  
Juniperus Communis ◽  
Rooting Ability ◽  
Site Restoration ◽  
Low Arctic ◽  
Seed Characteristics

Juniperus communis var. depressa is a species with potential for site restoration in the Canadian subarctic and low arctic. We assessed this potential by evaluating the rooting ability of cuttings and the seed quality of five populations of the species along the east coast of Hudson Bay, in subarctic Quebec. Cuttings of male and female plants were sampled from each site. Cones were collected, and seeds were extracted, weighed, and then tested for viability. Cuttings from female plants rooted more easily than those from male plants. At high indolyl-3-butyric acid concentration, rooting of female cuttings was inhibited. Among-population differences in rooting ability were large: cuttings from the northernmost population rooted more easily than those from sites further south. Seed number per cone and seed mass and viability also varied significantly among sites. Of the populations studied, the northernmost one produced the lightest seeds and the southernmost one produced the heaviest seeds. Juniperus presents some potential for restoration, but transplant (cutting or seedling) performance in the field should be evaluated before any definite recommendations are made. There is some evidence that seed quality and rooting ability are characteristics that are negatively related in Juniperus, although the basis of such a trade-off has not been investigated. Key words: gender differences in rooting ability, indolyl-3-butyric acid, restoration, Whapmagoostui-Kuujjuaraapik.

scholarly journals Seed production and seed quality of the dune building grass Panicum racemosum Spreng

1994 ◽  
Vol 8 (2) ◽  
pp. 193-203 ◽  
Author(s):  
Cesar Vieira Cordazzo ◽  
Anthony John Davy
Keyword(s):  
Seed Production ◽  
Clonal Growth ◽  
Seed Quality ◽  
Seed Mass ◽  
Coastal Dunes ◽  
Cultivated Plants ◽  
Strong Negative Correlation ◽  
Seed Characteristics ◽  
The Relationship

Seed production, pollination requirement, seed characteristics related to quality and the relationship between number and mass of seeds were examined for Panicum racemosum in three successional populations in southern Brazilian coastal dunes. The seed production was generally low and declined further between the frontal dunes and the backdunes, dropping from 4.05 seeds per panicle in the former to 1.8 seeds in the latter. However fertility (% fertile florets) did not differ among the three habitats. Plants cross-pollinated in a glasshouse showed an increase in seed production to 41.4 seeds compared to no seed production in self-pollinated plants. Caryopses varied in mass from 3.2 to 12.2 mg with a mean of 7.98 mg. A strong negative correlation was found between mean individual seed mass and the total number of seeds per panicle in a natural population. However, this relationship did not persist in seeds produced by cultivated plants in the glasshouse. The causes of low seed production appear to be mainly pollen self-incompatibility and additionally competition for nutrients between sexual reproduction and allocation to clonal growth. Under conditions of nutrient shortage, Panicum racemosum probably allocates resources more to clonal growth and to fewer, but well-endowed seeds. This would permit emergence from deeper burial sand, faster growth and greater survival of seedlings.

scholarly journals Physiological maturity and drying speed in the quality of zucchini ( Cucurbita pepo L.) seeds

2017 ◽  
Vol 39 (2) ◽  
pp. 142-149
Author(s):  
Hellismar Wakson da Silva ◽  
João Almir Oliveira ◽  
Lucinda Helena Fragoso Monfort ◽  
Jodson Moraes dos Santos ◽  
Ana Clara Reis Trancoso ◽  
...  
Keyword(s):  
Seed Quality ◽  
Seedling Emergence ◽  
Seed Mass ◽  
Accelerated Aging ◽  
Maturity Stage ◽  
Physiological Maturity ◽  
Randomized Design ◽  
Maturation Stages ◽  
Seed Health Test

Abstract: Harvesting and drying are essential procedures to obtain high quality seeds as well as for their conservation during storage. The goal of this research was to identify the physiological maturity stage and to verify the effect of drying speeds on the quality of zucchini seeds. A completely randomized design in a 3x2x2 factor scheme was used, involving three fruit maturation stages (49, 56 and 63 days after anthesis - DAA), two drying speeds (slow and quick) and two storage periods (0 and 6 months). Seed quality was evaluated by germination, first count, accelerated aging, electrical conductivity, tetrazolium, seedling emergence, emergence speed index and seed health test. Moisture content, thousand seed mass and percentage full seeds were also evaluated. Zucchini seeds reach maximum quality at 49 DAA. Slow or quick drying and storage do not affect the physiological quality of seeds that were harvested at 49 DAA. The delayed harvest of fruits reduces the quality of seeds. Quick drying reduces the incidence of the fungi Alternaria, Cladosporium, Phoma and Fusarium, and increases the occurrence of Aspergillus and Penicillium.

scholarly journals Influence of abiotic factors on seed quality of maize hybrids in the process of its storage

2021 ◽  
Vol 5 (1) ◽  
pp. 30-37
Author(s):  
M. Ya. Kyrpa ◽  
Yu. S. Bazilieva ◽  
O. F. Stasiv
Keyword(s):  
Growth Rate ◽  
Moisture Content ◽  
Chemical Treatment ◽  
Seed Quality ◽  
Abiotic Factors ◽  
Seed Mass ◽  
Seed Storage ◽  
Maize Hybrids ◽  
Storage Methods

The research results of influence of various abiotic factors on seed quality of maize hybrids during long storage are given. The most effective of them are: temperature regime, seed moisture content and oxygen access. The storage methods (dry and cold, and controlled atmosphere storage) that have the greatest impact on the seed quality were established. It was found that the optimal moisture content of seed depends on the storage duration, if for 1–2 years – 10–11 %, 3 years and more – 7–8 %. In order to stabilize the moisture content, it is recommended to store the seeds in airtight containers, limiting the humidity access from the outside. During the long-term seed storage, particularly for the breeding purposes, the temperature range should advisably maintain within 8–10 °C in seed storage place. With that the laboratory germination of seeds increased by 3–5 %, field germination – by 6–8 %, growth rate by number of sprouts– by 5–9 % and by the weight of sprouts – by 2–5 g compared to the 18–20 °C temperature in a typical storage. Methods of pre-sowing improvement of seed quality were established – it is separation and chemical treatment (seed dressing). Separation is the sifting of the seed mass through sieves with round holes in order to divide from the smallest fraction, the content of which was 15–23 % depending on the seed uniformity of maize hybrids. It was found that in order to assess objectively the effectiveness of different chemicals and establish their suitability for presowing seed treatment, it is necessary to determine laboratory germination, especially the growth rate by the number of sprouts and weight of 100 sprouts. Premature chemical treatment of seed should be avoided. Key words: maize hybrids, storage methods, abiotic factors, seed quality, presowing treatment.

scholarly journals HEAT DAMAGE AND DRYING EFFECTS ON SEED QUALITY

1985 ◽  
Vol 2 ◽  
pp. 53-57
Author(s):  
M.J. Hill ◽  
C.R. Johnstone
Keyword(s):  
Seed Quality ◽  
Seed Mass ◽  
Radiant Heat ◽  
Thermophilic Fungi ◽  
Seed Moisture Content ◽  
Heat Damage ◽  
Heated Air ◽  
Seed Moisture

Heat damage to seed can occur as a result of the cumulative effects of respiration and fungal heating, and by the accumulation and retention of radiant heat within the seed mass following harvest - both situations being collectively referred to as 'field heating'. Another type of heating damage occurs in heated air drying systems. Excessive drying air temperature can have deleterious effects on seed quality - this is generally referred to as "drying damage". Both 'field heating' and 'drying damage' result in loss of quality due to the thermosensitivity of seeds. This is a characteristic which is markedly influenced by the seed moisture content, by the extent and duration of heat production, and by the retention of heat within the seed mass. The role of the thermophilic fungi, Aspergillus spp., in accentuating heat damage, and the effects of both 'field heat' and 'drying damage' on the market acceptability and quality of seed is also discussed. Keywords: Respiration heating, fungal heating, Aspergillus, seed quality

scholarly journals Physiological Potential of Bean Seeds under Different Storage Temperatures

2017 ◽  
Vol 9 (12) ◽  
pp. 82
Author(s):  
Camila Hendges ◽  
Douglas Luzzi ◽  
Ricardo Walcker ◽  
Jéssica Inês Finger ◽  
Donizete Batista Carmelo ◽  
...  
Keyword(s):  
Seed Quality ◽  
Storage Temperature ◽  
Seed Mass ◽  
Accelerated Aging ◽  
Numerical Data ◽  
Cold Test ◽  
Temperature Conditions ◽  
Physiological Quality ◽  
Storage Temperatures

Stored beans have active metabolism and respiration may cause significant quality losses. Therefore, some care is necessary during this period, aiming at maintaining the physiological quality of seeds, minimizing their deterioration and reducing their germinative power. Seed quality during storage may be influenced by environmental factors and the interaction of genotypes with the environment. The objective was to evaluate the germination and vigor of bean seeds after 90-days storage under different temperature conditions. The experiment was conducted under a completely randomized design, with four replications, in 3 × 2 factorial scheme, considering three storage temperatures (10 °C, 20 °C and 30 °C) and two storage times (0 and 90 days). For potential evaluation, the following characteristics were considered: moisture content, thousand seed mass, germination, electrical conductivity, accelerated aging and cold test. Numerical data were submitted variance analysis with averages compared by means test at 5% of significance. Results showed that storage temperature conditions directly affect physiological quality of bean seeds. Temperature of 10 °C provided better seed conservation whereas temperature of 30 °C promoted higher deterioration and reduced vigor.

scholarly journals Variability of Seed Components of Selected Populations of English Ryegrass

2015 ◽  
Vol 15 (3) ◽  
pp. 267
Author(s):  
Željko Lakić
Keyword(s):  
Seed Yield ◽  
Seed Quality ◽  
Seed Mass ◽  
Research Field ◽  
Average Mass

The examination was performed at research field and laboratories of Agricultural Institute of Republic of Srpska-Banjaluka in the period 2006 - 2008. The goal of this paper was to examine the components of seed yield offsprings of autochthonous populations of English ryegrass, and based on these results, to single out the materials that would later be used in a program of creation of domestic varieties. During the examination, the following properties were analyzed: seed yield (kg ha-1), mass of 1000 seeds (g), size of seed (seed/g) and hectoliter mass (kg). During a biennial examination, significant differences were determined between populations of English ryegrass in a seed yield. The examined populations of English ryegrass achieved a high average seed yield (903.9 kg ha-1). The largest biennial average seed yield was achieved with populationSarajevo. The seed quality of the examined populations was good, while the average mass of 1000 seed amounted to 2.1 g. During these examinations, the smallest seed was inSarajevo population, while the largest one was in Banjaluka population. The average hectoliter seed mass of seven examined popu­lations of English ryegrass amounted to 25.8 kg.

scholarly journals Quality evaluation of Coffea canephora ‘Apoatã’ seeds for rootstock production

2018 ◽  
Vol 13 (1) ◽  
pp. 1
Author(s):  
Marcelo Curitiba Espíndula ◽  
Frederico José Evangelista Botelho ◽  
Aline Da Consolação Sampaio Clemente ◽  
Alexsandro Lara Teixeira ◽  
Gleice Quele Fonseca Alves ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Quality Evaluation ◽  
Seed Quality ◽  
Seed Mass ◽  
Coffea Canephora ◽  
Total Sugars ◽  
Fiber Protein ◽  
Physiological Quality ◽  
Potential Use

<p><em>Coffea canephora</em> ‘Apoatã’ seeds are used for the formation of rootstocks for grafting of <em>C. arabica</em> seedlings. The quality of seeds and the individualization of used genotypes are prevalent factors for the formation of vigorous rootstocks that will enhance the formation of quality seedlings. The aim of the present study was to characterize and evaluate the seed quality of <em>C. canephora</em> ‘Apoatã’ genotypes for potential use of rootstocks for <em>C. arabica</em> species. Were used seeds of 30 <em>C. canephora</em> ‘Apoatã’ genotypes, obtained from the experimental field of Embrapa Rondônia in Ouro Preto do Oeste, RO, Brazil. The seeds were processed and subjected to germination, first germination count and tetrazolium tests. Moisture, 100- seed mass and chemical composition analyses of seeds were also determined. The mass, physiological quality and chemical composition of <em>C. canephora</em> ‘Apoatã’ seeds vary according to the genotype. The variation of the physiological quality of <em>C. canephora</em> ‘Apoatã’ seeds is not related individually to caffeine, total sugars, ash, ether extract, crude fiber protein and chlorogenic acid. Seed batches of <em>C. canephora</em> ‘Apoatã’ from different genotypes contain seeds of different sizes, being indicated the classification before the processing stage in order to prevent mechanical damages.</p>

scholarly journals Sеed productivity and quality of Picea abies and P. pungens in the Kriviy Rih plantations

2018 ◽  
Vol 47 ◽  
pp. 19-28
Author(s):  
E. R. Нuseіnova
Keyword(s):  
Seed Quality ◽  
Seed Mass ◽  
Steppe Zone ◽  
Botanical Garden ◽  
Seedling Vigour ◽  
Industrial City ◽  
Industrial Enterprises ◽  
Metallurgical Combine ◽  
Old Trees

Reproductive capability is considered as one of indicators of successful introduction; it helps to evaluate adaptation potential of plants, especially in techogenic conditions. The aim of our work is to research morphometric parameters of cones, profitability and seed quality of Рісеа аbies та P. pungens in the plantations with various levels of aerotechnogenic influence in conditions of an industrial city in the steppe zone of Ukraine. The objects of the studying were the cones of 30–40-year-old trees of P. аbies та P. pungens from eight different plantations situated along the whole city of Kryvyi Rih (126 km) and having various levels of technogenic pollution. We revealed that the maximal length of cone in two investigated species (108,4 and 88,7 mm respectively), width (28,6 and 24,7 mm); the highest seedling vigour (41,0 and 7,2 %), laboratory germination (54,2 and 20,6 %), seed mass (6,9 and 4,2 g), and length of germ (18,5 and 13,8 mm) are noted in the trees from Botanical Garden. The minimal values of all the same indices were ascertained for the trees growing near the metallurgical combine “ArcelorMittal Kryvyi Rih”: length of cones – 92,3 and 73,9 mm; width of cones – 26,2 and 22,4 mm; as well as the lowest seedling vigour (2,4 and 1,4 %); laboratory germination (5,0 and 2,0 %), seed mass (5,4 and 3,4 g), and length of germ (12,6 and 5,4 mm). The general seed quantity for a cone of P. аbies та P. pungens, in all the plantation types, varied from 203,9 to 217,2 seeds and from 198,6 to 204,3 ones respectively. The least part of fertile seeds (11,5–13,3 %), and the biggest part of sterile (56,5–58,7 %) and underdeveloped (29,8–30,1 %) ones were noted in the plants of P. pungens directly exposed to emissions of industrial enterprises; for the plants of P. abies the same indices were 20,2–22,5 %; 51,5–52,6 % та 26,0–27,2 % respectively. Therefore, increasing level of techogenic pollution by air pollutants, which is observed during some last years, oppresses the generative sphere of species of genus Рісеа in conditions of the steppe zone of Ukraine.

Yield and Seed quality of barley (Hordeum vulgare L.) as affected by variety, nitrogen level and harvesting time

2014 ◽  
Vol 2 (2) ◽  
pp. 93-100
Author(s):  
Shahnaj Yesmina ◽  
Moushumi Akhtarb ◽  
Belal Hossain
Keyword(s):  
Grain Yield ◽  
Seed Weight ◽  
Seed Quality ◽  
Quality Parameters ◽  
Nitrogen Level ◽  
Yield Attributes ◽  
Harvesting Time ◽  
Nitrogen Levels ◽  
Vigour Index

The experiment was conducted to find out the effect of variety, nitrogen level and harvesting time on yield and seed quality of barley. The treatments used in the experiment consisted of two varieties viz. BARI Barley 4 and BARI Barley 5, three harvesting time viz. 35, 40 and 45 Days after Anthesis (DAA) and nitrogen levels viz. 0, 70, 85 and 100 kg N ha-1 . The experiment was laid out in a spilt- spilt-plot design with three replications assigning the variety to the main plot, harvesting time to the sub-plots and nitrogen level to the sub-sub plots. Variety had significant effects on the all yield attributes except fertile seeds spike-1 . Seed quality parameters viz. normal seeds spike-1 , deformed seeds spike-1 , germination (%) and vigour index were statistically significant. The variety BARI Barley 5 produced higher grain yield and seed quality than BARI Barley 4. Grain yield from BARI Barley 5 and BARI Barley 4 were 4.59 t ha-1 and 4.24 t ha-1 , respectively. Significantly, the highest 1000-seed weight (46.90 g) was produced by BARI Barley 5 than (37.90 g) BARI Barley 4. The result revealed that harvesting time had significant effect on yield and yield attributes and seed quality parameters. Seed yield was highest (4.65 t ha-1 ) when the crop harvested at 40 DAA and it was increased linearly from 35 DAA. Maximum quality seed and 1000-seed weight (43.20 g) was obtained when the crop harvested at 40 DAA. All the yields, yield attributes and seed quality parameters were significantly influenced by nitrogen levels. The highest grain yield (5.14 t ha-1 ) was obtained when BARI Barley 5 variety was fertilized by 100 kg N ha-1 and the lowest (3.14 t ha-1 ) was obtained from control treatments. Normal seeds spike-1 , vigour index, germination (%) were better at 85 kg N ha-1 in variety of BARI Barley 5 than BARI Barley 4. So it can be concluded that BARI Barley 5 showed better result when fertilized with 100 kg N ha-1 and harvested at 40 DAA for getting maximum yield and 85 kg N ha-1 and harvested at 40 DAA for getting better quality seed.

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