Elongation and circumnutation oscillations of hypocotyl of pine seedlings (Pinus silvestris L.)

1975 ◽  
Vol 17 (1) ◽  
pp. 43-49 ◽  
Author(s):  
M. Spurný
Keyword(s):  
Pinus Silvestris ◽  
Pine Seedlings

scholarly journals Incorporation of dl-[2−14C]mevalonic acid lactone into β-carotene and the phytol side chain of chlorophyll in cotyledons of four species of pine seedlings

1967 ◽  
Vol 105 (1) ◽  
pp. 89-92 ◽  
Author(s):  
S. Wieckowski ◽  
T W Goodwin
Keyword(s):  
Mevalonic Acid ◽  
Side Chain ◽  
Pinus Silvestris ◽  
Pine Seedlings ◽  
Acid Lactone ◽  
Β Carotene

1. The incorporation of dl-[2−14C]mevalonic acid lactone into β-carotene and the phytol side chain of chlorophyll has been investigated in cotyledons of four species of pine seedlings (Pinus silvestris, P. contorta, P. radiata and P. jeffrei) grown in darkness and in light. 2. The relative incorporation of label into β-carotene and the phytol side chain of chlorophyll is similar to that observed in experiments on monocotyledons and dicotyledons. 3. The relative incorporation of 14CO2 into β-carotene and phytol is much higher than the incorporation of [2−14C]mevalonic acid.

scholarly journals The effect of the photoperiod on the level of endogenous growth regulators in pine (Pinus silvestris L.) seedlings

2014 ◽  
Vol 51 (1) ◽  
pp. 59-70 ◽  
Author(s):  
Krystyna Kriesel ◽  
Sławomir Ciesielska
Keyword(s):  
Abscisic Acid ◽  
Growth And Development ◽  
Morphological Characters ◽  
Axillary Buds ◽  
Pinus Silvestris ◽  
Low Intensity ◽  
Pine Seedlings ◽  
Terminal Bud ◽  
Development Processes ◽  
High Level

The investigations were performed on pine seedlings growing under 12, 16 and 20 hour photoperiods. In 4 succesive stages of seedling development i.e. after 2, 12, 18 and 30 weeks of culture morphological characters of the seedlings were measured and the levels of auxins-, gibberellins-, cytokininsand abscisic acid-like inhibitor were determined. The intensity of growth and development of juvenile leaves, needles and of the shoot was the lowest in plants growing under 12 hour photoperiod conditions. As the length of the photoperiod increased so did the intensity of these processes. Under the 12 hour photoperiod the development of scale leaves, axillary buds and the formation of the terminal bud started earliest. This process reached completion under the 12 hour photoperiod and the bud remained in a state of dormancy. Seedlings growing under the 12 hour photoperiod were characterized by a low level of stimulators, and at the same time by a high level of inhibitors. On the other hand in seedlings grown at 16 and 20 hour photoperiods the content of stimulators was higher and that of inhibitors lower. A high intensity of growth and development processes was correlated with a high level of stimulators while a high level of inhibitors was correlated with a low intensity of these processes.The obtained results suggest the participation of gibberellins and cytokinins in the processes of regulation of the initiation of scale leaves and axillary buds, and the participation of these hormones and of abscisic acid in the regulation of needle elongation.

scholarly journals Gas exchange and organic substance production of Scots pine (Pinus silvestris L.) seedlings grown in soil cultures with ammonium or nitrate form of nitrogen

2015 ◽  
Vol 43 (1) ◽  
pp. 103-116 ◽  
Author(s):  
J. Zajączkowska
Keyword(s):  
Organic Matter ◽  
Gas Exchange ◽  
Chlorophyll A ◽  
Organic Substance ◽  
Pinus Silvestris ◽  
Organic Substances ◽  
Respiration Rates ◽  
Organic Matter Accumulation ◽  
Pine Seedlings ◽  
Chlorophyll A And B

Scotts pine seedlings were grown in soil cultures with a known content of N and C as well as organic substances. Walter solutions of the following salts: NaNO<sub>3</sub>, (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>, NH<sub>4</sub>Cl, NH<sub>4</sub>NO<sub>3</sub>, NH<sub>4</sub>HCO<sub>3</sub> were used as a source of nitrogen in particular nutritional variants. Organic matter accumulation in particular organs as well as the chlorophyll a and b content were determined, photosynthetic and respiration rates were also measured. It was found that differences in gas exchange and organic matter accumulation of seedlings grown on ammonium or nitrate form of nitrogen are similar in plants from water cultures as well as in those from soil cultures.

scholarly journals Effect of the change of nitrogen source on photosynthesis and respiration of Scots pine (Pinus silvestris L.) seedlings

2015 ◽  
Vol 43 (1) ◽  
pp. 93-101
Author(s):  
J. Zajączkowska
Keyword(s):  
Nitrogen Source ◽  
Scots Pine ◽  
Nitrogen Deficiency ◽  
Pinus Silvestris ◽  
Water Culture ◽  
Pine Seedlings ◽  
Different Response ◽  
Photosynthesis And Respiration

Rates of photosynthesis and respiration of Scots pine seedlings, grown in water culture under conditions of nitrogen deficiency and supplied with nitrogen in ammonium or nitrate form, were investigated. Besides, the rates of photosynthesis and respiration of the seedlings were measured, after changing the form of supplied nitrogen. A rapid and different response of nitrogen deficient seedlings was found independent on the form of supplied nitrogen. The investigations also showed a change in rates of photosynthesis and respiration of seedlings after changing the form of nitrogen.

scholarly journals Effect of white light irradiation on the endogenous growth regulators content in seeds and seedlings of pine (Pinus silvestris L.)

2015 ◽  
Vol 40 (3) ◽  
pp. 431-438 ◽  
Author(s):  
J. Kopcewicz
Keyword(s):  
Abscisic Acid ◽  
Endogenous Growth ◽  
Growth Regulators ◽  
White Light ◽  
Pinus Silvestris ◽  
Pine Seedlings ◽  
Simultaneous Decrease ◽  
Gibberellin Content ◽  
Seeds Germination ◽  
Effect Of Light

The increase of gibberellin content and decrease of amount of inhibitors in light irradiated pine seedlings were found. It was also stated that stimulating effect of light on pine seeds germination is correlated with the increase of gibberellin and simultaneous decrease of the inhibitor content. The inhibitor isolated from pine seeds proved to be a compound similar in some properties to abscisic acid.

scholarly journals The effect of potassium nutrition on growth and on plant hormones content in Scots pine (Pinus silvestris L.) seedlings

2014 ◽  
Vol 49 (3) ◽  
pp. 235-244 ◽  
Author(s):  
Marian Michniewicz ◽  
Jadwiga Stopińska
Keyword(s):  
Dry Matter ◽  
Growth Inhibitor ◽  
Plant Tissues ◽  
Pinus Silvestris ◽  
Fresh Weight ◽  
Potassium Nutrition ◽  
Pine Seedlings ◽  
Leafy Shoots ◽  
Positive Effect ◽  
Growth Of Seedlings

Pine seedlings were cultivated in Ingestad nutrient solution containing potassium as KCl on a 16-hr day, under light intensity of about 4000 lx and temperature of about 23° C. K+ used in a concentration of 50 ppm exerted a most pronounced positive effect on the growth of seedlings. After 4 months it was found that potassium used in this concentration increased elongation of hypocotyls, shoots, roots, primary and secondary needles as well as fresh weight and dry matter of tissues. In leafy shoots K+ increased the level of free gibberelirns (GAs) and auxins and decreased the amount of bound GAs and an ABA-like inhibitor. In the roots K+ nutrition increased the amount of free GAs and of the growth inhibitor and decreased the level of bound GAs and auxins. No evident influence of K+ on the level of cytokinins in plant tissues was stated.

scholarly journals Effect of root aeration and form of nitrogen on photosynthetic productivity of Scots pine (Pinus silvestris L.)

2015 ◽  
Vol 46 (2) ◽  
pp. 303-316 ◽  
Author(s):  
Andrzej Łotocki
Keyword(s):  
Organic Matter ◽  
Dry Weight ◽  
Growing Season ◽  
Pinus Silvestris ◽  
Water Culture ◽  
Photosynthetic Productivity ◽  
Pine Seedlings ◽  
Rate Of Photosynthesis ◽  
Photosynthesis And Respiration ◽  
Root Aeration

The response of 1-year old pine seedlings, grown in sand and water culture, to nutrition with nitrate or ammonium form of nitrogen, as well as to various aeration of the cultures was studied. Measurements of photosynthesis and respiration were carried out. Production of organic matter and its distribution to particular organs were determined. Seedlings supplied with NH<sub>4</sub>Cl were characterized by smaller contribution of root dry weight to the total weight of the plant. Poor aeration (heavy watering) of seedlings supplied with ammonium chloride caused a decrease in the rate of photosynthesis. Plants supplied with NH<sub>4</sub>C1 did not show the typical decrease of photosynthetic rate at the end of the growing season.

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