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2 edition of Effect of light quality and periodicity upon germination of Douglas-fir seed (Pseudotsuga menziesii (Mirb.) Franco) and on growth of Douglas-fir seedlings found in the catalog.

Effect of light quality and periodicity upon germination of Douglas-fir seed (Pseudotsuga menziesii (Mirb.) Franco) and on growth of Douglas-fir seedlings

Le Roy Curtis Johnson

Effect of light quality and periodicity upon germination of Douglas-fir seed (Pseudotsuga menziesii (Mirb.) Franco) and on growth of Douglas-fir seedlings

by Le Roy Curtis Johnson

  • 132 Want to read
  • 7 Currently reading

Published .
Written in English

    Subjects:
  • Germination.,
  • Plants, Effect of light on.,
  • Light, Colored.,
  • Light -- Physiological effect.,
  • Douglas fir.

  • Edition Notes

    Statementby Le Roy Curtis Johnson.
    The Physical Object
    Pagination85 leaves, bound :
    Number of Pages85
    ID Numbers
    Open LibraryOL14338141M

    A seed is an embryonic plant enclosed in a protective outer covering. The formation of the seed is part of the process of reproduction in seed plants, the spermatophytes, including the gymnosperm and angiosperm plants.. Seeds are the product of the ripened ovule, after fertilization by pollen and some growth within the mother plant. The embryo is developed from the zygote and the seed coat. The temperature requirements for seed germination and nutritional requirements for embryo growth were investigated in seed populations of Arurn maculatum L. plants growing in South-east England. Seeds freshly harvested from orange-red berries were shown to require a protracted period Cited by:

    Seed Germination and Dormancy J. Derek Bewleyl Department of Botany, University of Guelph, Guelph, Ontario N1G 2W1, Canada INTRODUCTION Seeds are a vital component of the world’s diet. Cereal grains alone, which comprise % of all cultivated seeds, contribute up to Cited by: Effects of temperature and light on germination and Bletia purpurea seeds were able to germinate to > 90% under all treatments. The greatest germination after 3 weeks was observed at ing seed germination is well documented and responses are highly variable among species. Heat stress plays a File Size: KB.

    Seed Germination Seeds vary in the amount of light that they need to germinate, with some seeds requiring considerable sunlight and others germinating only in complete darkness. Still other seeds will germinate in light or darkness, and others' preferences depend on the time of year or fertility of the soil. The effects of seed germination pattern, dormancy and storage on the percent germination were determined through three separate experiments. The effect of germination was determined using two seeds, a dicot (Glycine max) and a monocot (Zea mays) to.


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Effect of light quality and periodicity upon germination of Douglas-fir seed (Pseudotsuga menziesii (Mirb.) Franco) and on growth of Douglas-fir seedlings by Le Roy Curtis Johnson Download PDF EPUB FB2

It was found s-fir seed,s would respond to red-light treatments by germinating and that this stimulating effect of red light could be reversed with far-red light. The phytochrome enzyme system is therefore undoubtedly present. EFFECT OF LIGHT AND DARKNESS UPON THE GERMINATION OF SEEDS OF WESTERN WHEATGRASS, AGROPYRON SMITHII L.

1/ James C. Delouche and Louis N. Bass2/ Iowa State College Seed Laboratory Ames, Iowa Dormancy in seeds3/ is an important problem to seed analysts and seedsmen.

It is a problem to the seed analyst because special treatments and germination. Therefore, the main goal of our research was to evaluate the effect of light quality, using red, blue and red + white LEDs, on Stevia seed germination and seedling development so as to obtain high-quality plantlets useful for by: In the present study, germination percentage of heteromorphic seeds of S.

ferganica was higher under yellow or red light than that of green or blue light and dark, which is similar to Cattleya. Effects of light and temperature on gibberellin (GA)‐induced seed germination were studied in Arabidopsis thaliana (L.) Heynh. with the use of GA‐deficient (gal) mutants, mutants with a strongly reduced sensitivity to GA (gai) and with the recombinant gai/ by: Seed germination and light.

To investigate the effect of light on germination, seeds were incubated at a constant temperature of 25 °C, and exposed to alternating light (8 h dark and 16 h light) and continuous darkness in an environmentally controlled Labcon™ (V, 50 Hz) low-temperature incubator and growth by: Effect of wave-length of radiation was studied by the same method as is the case reported by NAKAMURA 15) 1.

In Cruciferae, the germination of radish seed is inhibited by light, and seed of Brassica vegeta-bles is favored by light. The former is inhibited by light strongly at low temperature for a while after harvest. ‘Grand Rapids’ lettuce.

seed will not germinate in darkness at 30°. An exposure in temperatures between 5°C and 25°C for a short period after the initiation of germination can effectively overcome the high temperature imposed dormancy. If the exposure to low temperature is from the beginning of germination it is less by:   Although the main role of phytochrome is in light-induced stimulation of seed germination, a role in the onset of dormancy or the setting of the light requirement is suggested by the experiments of McCullough and Shropshire () and Hayes and Klein ().

These authors showed that the R/FR ratio experienced by the mother plant and therefore during seed maturation, affects the subsequent germination Cited by: Dry Douglas-fir seeds pre-treated with red light have significantly higher germination when compared to seed receiving no red light pretreatment, provided the seeds are germinated in absolute darkness but not if the seeds are allowed to germinate under "standard" conditions or when sown in the soil.

Shaban () also highlighted the effect of growing temperature on seed germination, and Moles and Westoby () and Onyekwelu et al. () mentioned light, moisture and soil quality as factors. “Effect of the visible spectrum upon the germination of seeds and fruits”. In Biological Effects of Radiation, McGraw-Hill, New York, pp.

– Google ScholarCited by: 1. Brachypodium, germination, light, phytochrome, seed dormancy. Summary • Lack of grain dormancy in cereal crops such as barley and wheat is a common problem affecting farming areas around the world, causing losses in yield and quality because of pre-harvest sprouting.

Control of seed or grain dormancy has been investigated extensively usingCited by: Suffice it to say that it is mainly the light's effect upon a plant pigment called phytochrome within the seed. This relates to the type of light which the seed receives.

As a generalisation, light in the red wave length usually promotes germination whereas blue light inhibits it. Abstract. Seed germination in many plant species is influenced by light.

Promotive effects of light were first documented in the second half of the 19th century, but later inhibitory effects were also by: Abstract Effect of stratification period (S) and incubation temperature (T) on germination be- havior were tested by using two groups of Douglas-fir orchard seedlots that had given low germination percentages in standard tests.

factors such as temperature, light, pH, and soil moisture are known to affect seed germination (Rizzardi et al., ). Temperature plays a major role in determining the periodicity of seed germination and the distribution of species (Guan et al., ).

In the germination process, the seed’s role is that of a. A study on the effects of light quality and periodicity on the ger-mination of Douglas-fir seed and the growth of Douglas-fir seedlings was conducted. Interest was focused on responses that could be measured and observed without biochemical assay.

It was found s-fir seed,s would respond to red-light treatments by germinating and that this stimulating effect of red light. Effects of light quality on seed germination and seedling growth of Cattleya orchids in vitro. Seed size is an important physical indicator of seed quality that affects growth and is frequently related to yield, market grade factors and harvest efficiency.

Seed germination is controlled by many internal and external factors. Seed size is an important parameter, which influences the germination,File Size: KB. Seed germination may be defined as the fundamental process by which different plant species grow from a single seed into a plant.

This process influences both crop yield and quality. A common example of seed germination is the sprouting of a seedling from a seed of an angiosperm or gymnosperm.Effects of Light on Seed Germination and Plant Growth.

Plant hormones that respond to light govern the growth of plants from germination through the growing season. Some plants require full sun.LIGHT EFFECTS ON TREE GROWTH AND SEED GERMINATION H. A. BORTHWICK Crops Research Division, Agricultural Research Service U.

S. Department of Agriculture, Plant Industry Station, Beltsville, Maryland Everyone knows that trees cannot grow without light, but not why they require light for processes besides photosynthesis. What are some of these File Size: 2MB.