effect of seed source on transpiration rates of seedlings of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)

  • 46 Pages
  • 2.56 MB
  • English
Seedlings., Plants -- Transpira
Statementby Wolfhard Friedrich Ruetz.
The Physical Object
Pagination[8], 46 leaves, bound :
ID Numbers
Open LibraryOL14258490M

In this study transpiration rates were measured on Douglas-fir seedlings from five seed sources. The seedlings were grown under two environments, a growth chamber and outside in cold frames.

Transpiration was measured at two ages, 4 and 16 weeks. Comparison of transpiration rates was made at low soil moisture stress. Transpiration was measured using humidity sensing elements to measure water vapor before and after passing the : Wolfhard Friedrich Ruetz.

Rates of photosynthesis, respiration, and transpiration in Douglas-fir seedlings that grew from seed collected in a wet and a dry site were determined under conditions of variable soil-moisture by: Abstract.

Graduation date: In this study transpiration rates were measured on Douglas-fir\ud seedlings from five seed sources. The seedlings were grown under\ud two environments, a growth chamber and outside in cold frames.\ud Transpiration was measured at two ages, 4 and 16 weeks.

Seedlings of Douglas‐fir from seed of a number of mesic and xeric origins were grown in growth chambers and a nursery to various ages up to 16 weeks. Measurements were made to determine the effect Cited by: Graduation date: The objective of this study was to determine the effect of age\ud on rates of transpiration by Douglas-fir seedlings.

Seeds were\ud collected from a xeric site (Goldendale, Washington) and a mesic\ud site (Forks, Washington). Seedlings of Douglas-fir from seed of a number of mesic and xeric origins were grown in growth chambers and a nursery to various ages up to 16 weeks.

In a pot trial growth and transpiration of 3-year-old Douglas-fir seedlings on an acid, sandy soil was examined at a deficient (30 kg N ha-1 year-1) and an excessive level ( kg N ha-1 year-1 of NH4 application.

Dissolved ammonium sulphate was applied to the pots weekly for two growing seasons. In half of the pots a complete set of other nutrients was applied in optimal proportions to the Cited by: 3. Seedlings were prepared by soaking the seeds in warm water for 24 hours, then air-drained and incubated for 2 days until germination.

In the SRI method, the seedlings were planted in a tray, with soil and organic fertilizers enriched by biofertilizers ( v/v), and were grown for 10 by:   Affect on stream flow. Water flow in these areas has been indicated to be affected by these differing rates.

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Moore examined stream flow patterns at differing intervals at the old Douglas fir stand (). She found that there was a relationship between transpiration and watershed stream flow during the summer season.

On the hourly scale, the stream flow was negatively correlated with transpiration. Seedlings from Calabar seed source produced the largest amount of dry weight ( g plant-1), while seedlings from Benin City seed source had lowest dry weight of g plant The effect of age, preconditioning, and water-stress on the transpiration rates of Douglas-fir (Pseudotsuga menziesii) seedlings of several ecotypes.

Physiol. Physiol. Plant. –Cited by: 6. The seed zone identity numbers shown on the map are listed in our catalogue against each batch of native plants. There are a number of reasons for using local provenance stock for native woodland creation purposes: Improved survival rates and productivity.

Trees grown from British seed sources are able to withstand British weather conditions. The effect of wind velocity on the transpiration rate of plants. The effect of humidity on the transpiration rate of plants.

Description effect of seed source on transpiration rates of seedlings of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) EPUB

Some xerophytes will reduce the surface of their leaves during water deficiencies (left). Some factors that can affect the imbibition rate are: Temperature – Imbibition rate is directly affected by the temperature; Imbibant’s nature – Starch has lesser capacity while proteins have a great imbibing capacity.

Solute’s concentration – It is indirectly proportional to the rate of imbibition. ADVERTISEMENTS: The below mentioned article includes a collection of thirteen experiments on transpiration.

Experiment to demonstrate the transpiration phenomenon with the bell jar method: ADVERTISEMENTS: Requirements: Bell jar, well-watered potted plant, rubber sheet, glass plate, Vaseline.

Method: 1. Take a well-watered, healthy potted plant and cover the pot with the help of. The series of experiments reported here used grafted ramets and seedlings of Douglas-fir to examine the effects of different girdling methods on seed and pollen cone production, seed production, seed char-acteristics, tree vigour and ability to recover.

N.B. In case of terrestrial plants effect of CO2 concentration on the rate of photosynthesis (in terms of starch formation) may be studied by covering the plant material with a bell jar fitted with a CO2-gas-measuring burette at the top to control the CO2 inflow inside the belljar with respect to time.

(c) Temperature factor: Experiment. Mean germination rate was calculated for the germinated seeds on each pefri dish. The rate expresses daily development toward germination after entering incuba tion; for example, if a seed requires 8 days to germinate, the embryo development rate for that seed is 1/8 or units per day (Campbell and SorenseoHegarty ).

The effect of internal and external moisture stress on the transpiration rate of Douglas-fir seedlings (Pseudotsuga menziesii (Mirb.) Franco) Public Deposited AnalyticsAuthor: Phillip Unterschuetz. Now-a-days the Douglas-fir is known for its use as Christmas trees.

The timber from Douglas-firs is used to make furniture, poles, fences, flooring, and many other things. Propagation Methods: The Douglas-fir is classified as a conifer. This means that they are seed producing trees that produce their seed inside of cones and not flowers.

without adjustment for seed weight. However, in Douglas­ fir, S seedlings had significantly higher number of coty­ ledons than C seedlings, i.e., the inbreeding effect was toward increased numbers. FowLER () reported a similar effect in Pinus banksiana. Comparative height growth of S.

Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco). The primary source of inoculum is:hought to be infested seed (James a, ), although recent observations indicate inoculum is also carried from one year to the next in both styroblocks (James and others a) and Ray Leach~ pine cells (James and Gilligan ), even those.

ThepCO 2 has been shown to affect transpiration, N allocation, and photosynthetic rate of Douglas-fir seedlings and saplings in a series of studies utilizing sunlit, environmentally controlled growth chambers (Lewis et al.

; Tingey et al. ).Cited by: This factor is important because the rate of water movement directly affects a plant's transpiration rate.

Details effect of seed source on transpiration rates of seedlings of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) EPUB

The relative humidity in the air spaces between leaf cells approaches percent. When a stoma opens, water vapor inside the leaf rushes out into the surrounding air (Figure 25), and a bubble of high humidity forms around the stoma.

Seed Sources. To investigate some of these questions relating to genetic variation, seeds were collected from a wide variety of sources throughout the native range of coastal Douglas-fir (Pseudotsuga menziesii var.

menziesii).The seeds were then planted and container grown as part of a study in the genetic variation of coastal Douglas-fir called the Douglas-fir Seed-Source Movement Trial (SSMT). Buy Green Douglas Fir tree seeds from the tree growing experts.

Select from over species of tree and shrub seeds for sale. The Green Douglas Fir can grow to heights of 40 to 80 feet. The most likely explanation for this was seed respiration. The combined results suggest that dormancy breakage in Douglas fir seeds requires a hydration level sufficient for respiration to take place, and that, after maximal dormancy release, seeds at the highest mc (35–40%) exhaust their food reserves and begin to by: 9.

The pH of xylem sap from tomato (Lycopersicon esculentum) plants increased from pH to as the soil dried. Detached wild-type but not flacca leaves exhibited reduced transpiration rates when the artificial xylem sap (AS) pH was increased. When a well-watered concentration of abscisic acid ( μm) was provided in the AS, the wild-type transpirational response to pH was Cited by: Douglas-fir is an excellent specimen plant or used in mass for screening.

Although not a true fir, it is a beautiful evergreen for the larger landscape. It has a conical shape, similar to that seen on spruces. Discover the best Children's Flower & Plant Books in Best Sellers. Find the top most popular items in Amazon Books Best Sellers.

(Nature Book for Kids, Gardening and Vegetable Planting, Outdoor Nature Book) Oh Say Can You Seed?: All About Flowering Plants (Cat in the Hat's Learning Library) Bonnie Worth. out of 5 stars. I mentioned in my last entry that my vegetable seeds have started to germinate!

I thought I'd take this opportunity to talk a little bit more about SEED GERMINATION and the factors that can affect germination rates. Some of these are your standard gardening book variety factors, some are a little less obvious and come. The Douglas fir is a magnificent pine, capable of reaching heights of feet or taller; although most Douglas firs in home settings rarely exceed 60 to 80 feet in height.

Douglas fir grow best in colder regions of the country, especially in USDA hardiness zones 4 through 6. The Douglas fir is .Put about 10 radish seeds into the dry microwave safe container. Set the timer for 15 seconds, make sure you have both the radish cup and water cup inside, set the power to high, and hit start.

After the seeds have been microwaved, remove them and place them on another paper towel bed and foil. Label with the 15 seconds label.