Drying and storage of prechilled Douglas fir, Pseudotsuga menziesii, seeds

1999 ◽  
Vol 29 (2) ◽  
pp. 172-177 ◽  
Author(s):  
C Muller ◽  
E Falleri ◽  
E Laroppe ◽  
M Bonnet-Masimbert
Keyword(s):  
Moisture Content ◽  
Pseudotsuga Menziesii ◽  
Traditional Method ◽  
Detrimental Effect ◽  
Seedling Emergence ◽  
Douglas Fir ◽  
Dormancy Release ◽  
Optimal Temperature ◽  
Germination Speed ◽  
And Storage

Douglas fir, Pseudotsuga menziesii (Mirb.) Franco, seeds exhibit relative dormancy as they do not germinate at suboptimal temperature (15°C), whereas at optimal temperature (20°C) some germination occurred. Thus, germination at 15°C was chosen to estimate dormancy release. In the first experiment, seeds were prechilled at 32% moisture content (MC) for 0-34 weeks at 3°C. Long chilling treatments enhanced germinability and, more markedly, germination speed both at 20°C and at 15°C. Seeds pretreated for the longest periods were then dried to 6.7% MC and stored up to 6 months without any detrimental effect on germination at 15°C. In the second experiment, seeds from a second seedlot were prechilled for 18 weeks and then stored at three different MCs over a period of 17 months. Seeds stored at the lowest MC (6.7%) germinated fastest and to the highest percentage both at 15 and 20°C. In the nursery, seedling emergence tests confirmed results from this experiment. In most cases, comparisons between seeds prechilled at controlled MC before storage and those stratified with the traditional method resulted in better performance of the first ones, both in the laboratory and in the nursery.

scholarly journals FACTORS AFFECTING THE VIABILITY AND GERMINATION BEHAVIOR OF CONIFEROUS SEED. V. SEED MOISTURE CONTENT DURING STRATIFICATION AND SECONDARY STORAGE, PSEUDOTSUGA MENZIESII (MIRB.) FRANCO

1962 ◽  
Vol 38 (3) ◽  
pp. 303-312 ◽  
Author(s):  
G. S. Allen
Keyword(s):  
Moisture Content ◽  
Pseudotsuga Menziesii ◽  
Douglas Fir ◽  
Secondary Storage ◽  
Seed Moisture Content ◽  
Factors Affecting ◽  
Seed Moisture ◽  
And Storage ◽  
Post Stratification

Two seedlots of Douglas fir were each soaked to two levels of moisture content, stratified for 20-120 days at 0-2 °C., subjected to post-stratification storage, and incubated at 10°, 15°, and 25 °C. The higher moisture content (60-70 per cent) was superior for both seedlots particularly when the seed was subjected to drying and storage after stratification. The ability of Douglas fir seed to withstand stratification, drying, and storage for a total time of 240 days, without loss of germinative capacity or vigor, is shown.

scholarly journals Effect of Different Packaging Materials and Storage Environments on Seed Quality of Sesame (Sesamum Indicum L.)

2019 ◽  
Vol 11 (1) ◽  
pp. 1
Author(s):  
Hnin Thida Nyo ◽  
Nyein Nyein Htwe ◽  
Kyaw Kyaw Win
Keyword(s):  
Moisture Content ◽  
Seed Quality ◽  
Carbon Dioxide Concentration ◽  
Sesame Seed ◽  
Germination Percentage ◽  
Release Time ◽  
Packaging Materials ◽  
Dormancy Release ◽  
Heat Accumulation ◽  
And Storage

The speed of the deterioration of oil-seeds depends on conditions of the storage environment and understanding dormancy release time is important to increase the amount and uniformity in germination. Therefore, the present study was conducted to evaluate the effect of different packaging materials and storage environments on viability and dormancy of sesame. The black sesame seed was stored in three packaging materials (woven polypropylene bag, IRRI super bag, metal bin) under two environment conditions (ambient and cold storage) for eight-month (initial storage, 2-month, 4-month, 6-month and 8-month). The effect of storage environments, packaging materials and storage durations on germination percentage, germination index, seedling vigor index I and II were significant. The moisture content decreased in the early parts of storage periods and then increased in later. The moisture content of seeds in the packaging materials increased in long storage due to the effect of seed respiration and heat accumulation in a package. Higher viability was observed in ambient storage, and in a woven polypropylene bag. Because the dormancy release was slow in low- temperature condition and the carbon dioxide concentration in the airtight package inhibited the dormancy break. It also increased during storage and the earliest fully dormancy break has occurred in six-month of woven polypropylene bag storage under ambient condition. Therefore, the germination and dormancy release of sesame were influenced by storage environments packaging materials and storage durations.

scholarly journals Germination of Psidium friedrichsthalianum (O. Berg) Nied. seeds under different temperature and storage conditions

2018 ◽  
Vol 40 (3) ◽  
pp. 246-252 ◽  
Author(s):  
Daniel Felipe de Oliveira Gentil ◽  
Sidney Alberto do Nascimento Ferreira ◽  
Elizabeth Rodrigues Rebouças
Keyword(s):  
Seed Germination ◽  
Moisture Content ◽  
Storage Conditions ◽  
Germination Speed ◽  
Meloidogyne Spp ◽  
And Storage

Abstract: Psidium friedrichsthalianum is a species whose fruit can be used to make juices, jellies/jams and sweets, and its seedlings serve as rootstocks with resistance to Meloidogyne spp. The aim of this study was to evaluate the performance of seeds of this species at different germination temperatures, and to verify the effects of different moisture levels on their storage in two experiments. In the first, six germination temperatures (15, 20, 25, 30, 35, and 40 ºC) were evaluated, and in the second, seeds with different moisture levels (15.4, 9.8, 9.0, 8.4, and 8.2%) were stored in sealed containers at 20 °C for 0, 1, 3, 6, 9, and 12 months. Seed germination was favored by temperatures of 20 ºC and 25 ºC, reaching 93% and 87%, respectively, along with the highest germination speed indexes (2.582% day1 and 2.568% day-1) and shortest germination times (37.9 and 36.9 days). Temperatures of 30 °C and 35 °C maintained the seeds quiescent, while 40 °C was lethal. In storage, the seeds tolerated desiccation to 8.2% moisture content and could be stored in sealed containers at 20 ºC for 12 months, with germination higher than 70%.

Effects of tree cover, understory vegetation, and litter on regeneration of Douglas-fir (Pseudotsuga menziesii) in southwestern Argentina

1998 ◽  
Vol 28 (5) ◽  
pp. 683-692 ◽  
Author(s):  
F D Caccia ◽  
C L Ballaré
Keyword(s):  
Seed Germination ◽  
Pseudotsuga Menziesii ◽  
Seedling Emergence ◽  
Canopy Cover ◽  
Douglas Fir ◽  
Understory Vegetation ◽  
Tree Cover ◽  
Growth And Survival ◽  
Thermal Environments ◽  
Seedling Predation

The factors and processes that regulate Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) natural regeneration in southwestern Argentina are unknown. We investigated (i) the germination responses of P. menziesii seeds to variations in the radiation and thermal environments imposed by canopy cover and litter, (ii) the effects of litter on seedling emergence, and (iii) the effects of understory vegetation on seedling performance and seed and seedling predation. Seed germination was high in darkness and under canopies. Under a combination of canopy types and litter covers, germination showed a negative correlation with temperature between 23 and 40°C. Germination was not altered by changes in red/far-red ratio. These results suggest that the presence of an overstory canopy promotes P. menziesii seed germination compared with a no-canopy situation (e.g., a clearcut). Litter inhibited seedling emergence by reducing water availability and by acting as a mechanical barrier. Understory vegetation (established saplings) reduced seedling growth and survival. However, our results suggest that direct competition between seedlings and understory vegetation is not the principal force regulating regeneration; indirect effects appear to be of paramount importance because P. menziesii seed and seedling consumption (presumably by rodents) is greatly encouraged by the presence of dense vegetation patches in the understory.

Relationships Between Sapwood Amount, Latewood Percentage, Moisture Content and Crown Vitality of Douglas Fir, Pseudotsuga Menziesii

IAWA Journal ◽  
1993 ◽  
Vol 14 (4) ◽  
pp. 413-427 ◽  
Author(s):  
Ingrid de Kort
Keyword(s):  
The Netherlands ◽  
Moisture Content ◽  
Pseudotsuga Menziesii ◽  
Douglas Fir

Relationships between sapwood amount, latewood percentage, moisture content and crown vitality were studied in 171 Douglas firs [Pseudotsuga menziesii (Mirb.) Franco] belonging to different vitality classes. The trees originated from 10 stands in the Netherlands varying in age from 25-70 years.

Drying characteristics and equilibrium moisture content of steam-treated Douglas fir (Pseudotsuga menziesii L.)

2012 ◽  
Vol 116 ◽  
pp. 396-402 ◽  
Author(s):  
Pak Sui Lam ◽  
Shahab Sokhansanj ◽  
Xiaotao T. Bi ◽  
C. Jim Lim ◽  
Sylvia H. Larsson
Keyword(s):  
Moisture Content ◽  
Equilibrium Moisture Content ◽  
Pseudotsuga Menziesii ◽  
Douglas Fir ◽  
Drying Characteristics

No Correlation between Latewood Formation and Leader Growth in Douglas-Fir Saplings

IAWA Journal ◽  
2006 ◽  
Vol 27 (2) ◽  
pp. 183-191 ◽  
Author(s):  
Heidi J. Renninger ◽  
Barbara L. Gartner ◽  
Amy T. Grotta
Keyword(s):  
Pseudotsuga Menziesii ◽  
Cell Expansion ◽  
Growing Season ◽  
Height Growth ◽  
Douglas Fir ◽  
Cambial Zone ◽  
Wood Strength ◽  
And Storage ◽  
Cell Wall Deposition ◽  
Indole 3 Acetic Acid

The width of earlywood and latewood in conifer xylem may have a profound effect on water transport and storage, vulnerability to embolism, and wood strength, yet the controls over the timing of latewood formation are unclear. Tracheids differentiating in the cambial zone are influenced by IAA, indole-3 acetic acid, the radial concentration gradient of which appears to either increase cell expansion (earlywood) or increase cell wall deposition (latewood). There are suggestive data that latewood begins to form when the growth of the leader stops, but definitive results are lacking. Height growth was measured in 14 Douglas-fir (Pseudotsuga menziesii) saplings at 10 dates between May and August, from the beginning of the growing season until after height growth had ceased. The cambium was also pinned six times between June and July, to induce xylem scarring at known dates. After height growth ceased, saplings were harvested and transverse sections of the wood were made at the pin insertion points. The date at which 95% of the height growth had occurred and the date at which latewood formation had begun were estimated. Analysis showed no correlation of these data, suggesting that the two phenomena may occur around the same time, but that one is not causal of the other.

scholarly journals A new insight in desiccation tolerance and cryopreservation of mazzard cherry (Prunus avium L.) seeds

2015 ◽  
Vol 10 (1) ◽  
Author(s):  
Marcin Michalak ◽  
Beata P. Plitta-Michalak ◽  
Paweł Chmielarz
Keyword(s):  
Moisture Content ◽  
Liquid Nitrogen ◽  
Desiccation Tolerance ◽  
Prunus Avium ◽  
Seedling Emergence ◽  
Seed Banks ◽  
Variable Response ◽  
And Storage ◽  
Prunus Avium L

AbstractA variable response of Prunus avium L. seeds to desiccation and storage in liquid nitrogen (LN) has been reported in the literature. The majority of these experiments were conducted on initially dried seeds. The desiccation and LN exposure tolerance of fresh P. avium seeds is unknown. In the present study, fresh seeds were used to determine seed response to desiccation and cryopreservation. Desiccation of seeds from a moisture content (MC) of 19.7-20.2% to 10.1-10.9% or 07.6-8.5% reduced seedling emergence from approximately 73 to 19 and 16% for first provenance; and from approximately 89 to 10-12% for second provenance of seeds. After exposure to LN, seeds had the highest seedling emergence when seed MC was the highest (19.7 and 20.2%, respectively) prior to cryostorage. Results indicated that P. avium seeds should be classified as intermediate. For cryopreservation in seed banks, we recommend that seeds be dried directly after extraction from fruits in the range of 16.8-20.2% of MC (0.21-0.25 g·g

Barley seed storage under controlled conditions

2019 ◽  
pp. 140-150 ◽  
Author(s):  
O. A. Zadorozhna ◽  
T. P. Shyianova ◽  
M.Yu. Skorokhodov
Keyword(s):  
Hordeum Vulgare ◽  
Moisture Content ◽  
Spring Barley ◽  
Seed Storage ◽  
Growing Season ◽  
Storage Conditions ◽  
Meteorological Conditions ◽  
Hordeum Vulgare L ◽  
The Relationship ◽  
And Storage

Seed longevity of 76 spring barley gene pool samples (Hordeum vulgare L. subsp. distichon, convar. distichon: 56 nutans Schubl., two deficience (Steud.) Koern., two erectum Rode ex Shuebl., two medicum Koern.; convar. nudum (L.) A.Trof.: one nudum L. та subsp. vulgare: convar. vulgare: nine pallidum Ser., three rikotense Regel.; convar. coeleste (L.) A.Trof.: one coeleste (L.) A.Trof.) from 26 countries, 11 years and four places of reproduction was analyzed. Seeds with 5–8% moisture content were stored in chamber with unregulated and 4oC temperature. The possibility of seed storage under these conditions for at least 10 years without significant changes in germination has been established. The importance of meteorological conditions in the formation and ripening of seeds for their longevity is confirmed. The relationship between the decrease of barley seeds longevity and storage conditions, amount of rainfall, temperature regime during the growing season of plants is discussed.

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