Simazine and Phosphorus Interactions in Red Pine Seedlings

Weeds ◽  
1967 ◽  
Vol 15 (4) ◽  
pp. 339 ◽  
Author(s):  
P. S. Dhillon ◽  
W. R. Byrnes ◽  
C. Merritt
Keyword(s):  
Red Pine ◽  
Pine Seedlings

scholarly journals Ectomycorrhizal Fungi Associated with Pinus densiflora Seedlings under Flooding Stress

2021 ◽  
Vol 13 (8) ◽  
pp. 4367
Author(s):  
Yoonhee Cho ◽  
Shinnam Yoo ◽  
Myung Soo Park ◽  
Ji Seon Kim ◽  
Chang Sun Kim ◽  
...  
Keyword(s):  
Ectomycorrhizal Fungi ◽  
Internal Transcribed Spacer ◽  
Pinus Densiflora ◽  
Red Pine ◽  
Fungal Communities ◽  
Thelephora Terrestris ◽  
Suillus Luteus ◽  
Flooding Stress ◽  
Pine Seedlings ◽  
Rhizopogon Luteolus

Flooding is an environmental stress for plants that not only limits aeration and nutrient acquisition, but also disturbs underground plant-associated fungal communities. Despite frequent flooding, red pine (Pinus densiflora) seedlings thrive in streamside environments. However, whether the compatible ectomycorrhizal fungi (EMF) of red pine are affected by natural flooding is unclear. As EMF are vital symbionts for the development of many trees and allow them to overcome various environmental stresses, in this study, the EMF species associated with red pine seedlings in a streamside environment in Korea were investigated after flooding. The EMF species in 47 seedlings collected from the streamside site were identified by observing their different morphotypes using internal transcribed spacer sequence analysis, and a total of 10 EMF species were identified. The EMF species diversity was lower than that in samples collected from a nearby forest analyzed as a control. The dominant EMF species of streamside seedlings included Amphinema spp., Rhizopogon luteolus, Suillus luteus, and Thelephora terrestris. This study could serve as a basis for investigating the mechanisms by which advantageous EMF aid plant development under flooding stress.

Effects of root zone temperature on root initiation and elongation in red pine seedlings

1986 ◽  
Vol 16 (4) ◽  
pp. 696-700 ◽  
Author(s):  
Chris P. Andersen ◽  
Edward I. Sucoff ◽  
Robert K. Dixon
Keyword(s):  
Root Elongation ◽  
Root Zone ◽  
Soluble Sugar ◽  
Soluble Sugars ◽  
Red Pine ◽  
Root Tip ◽  
Root Initiation ◽  
Root Zone Temperature ◽  
Pine Seedlings ◽  
Zone Temperature

The influence of root zone temperature on root initiation, root elongation, and soluble sugars in roots and shoots was investigated in a glasshouse using 2-0 red pine (Pinusresinosa Ait.) seedlings lifted from a northern Minnesota nursery. Seedlings were potted in a sandy loam soil and grown in chambers where root systems were maintained at 8, 12, 16, or 20 °C for 27 days; seedling shoots were exposed to ambient glasshouse conditions. Total new root length was positively correlated with soil temperature 14, 20, and 27 days after planting, with significantly more new root growth at 20 °C than at other temperatures. The greatest number of new roots occurred at 16 °C; the least, at 8 °C. Total soluble sugar concentrations in stem tissue decreased slightly as root temperature increased. Sugar concentrations in roots were similar at all temperatures. The results suggest that root elongation is suppressed more than root tip formation when red pine seedlings are exposed to the cool soil temperatures typically found during spring and fall outplanting.

Growth and Nitrogen Availability of Red Pine Seedlings under High Nitrogen Load and Elevated Ozone

2004 ◽  
Vol 4 (2/3) ◽  
pp. 277-287 ◽  
Author(s):  
Tatsuro Nakaji ◽  
Takuya Kobayashi ◽  
Mihoko Kuroha ◽  
Kumiko Omori ◽  
Yuko Matsumoto ◽  
...  
Keyword(s):  
Nitrogen Availability ◽  
Red Pine ◽  
High Nitrogen ◽  
Elevated Ozone ◽  
Pine Seedlings

Effects of canopy N uptake on foliar CO2 assimilation rates and biomass production and allocation in Japanese red pine seedlings

2012 ◽  
Vol 42 (7) ◽  
pp. 1395-1403 ◽  
Author(s):  
Masaaki Chiwa ◽  
Toshihide Matsuda ◽  
Nobutake Nakatani ◽  
Tsuyoshi Kobayashi ◽  
Atsushi Kume ◽  
...  
Keyword(s):  
Root Biomass ◽  
Pinus Densiflora ◽  
N Uptake ◽  
C Sequestration ◽  
Red Pine ◽  
N Availability ◽  
Atmospheric N Deposition ◽  
Japanese Red Pine ◽  
Pine Seedlings ◽  
Psii Photochemistry

To investigate the direct physiological effects of CNU (canopy nitrogen uptake), three mist solutions (control, N1, and N2 with 0.03, 13.1, and 32.7 kg NH4+-N·ha–1, respectively) were sprayed on Japanese red pine (Pinus densiflora Sieb. et Zucc.) seedlings three times a week for three months. Waterproof sheets protected the surface soil during misting to avoid adding N to the soil. The results show N mist treatments to foliage increased needle N availability in proportion to N dose, which was large enough to cause greater N and chlorophyll content in the needles. This suggests that N is rapidly absorbed, is directly assimilated by the needles, and is used in photosynthesis. These increases resulted in higher maximum net CO2 assimilation rates (Amax) and maximum quantum yield of PSII photochemistry (Fv/Fm) of pine seedlings and subsequently increased bud and root biomass. Increased root biomass reduced the sensitivity of the shoot-to-root ratio to increased N availability in the foliage. In conclusion, our study supported the idea that CNU should be taken into consideration when evaluating the impacts of elevated atmospheric N deposition on forest C sequestration and biomass allocation.

Interaction of mineral phosphate-dissolving microbes with red pine seedlings

1976 ◽  
Vol 45 (2) ◽  
pp. 493-507 ◽  
Author(s):  
D.B. Ralston ◽  
R.P. McBride
Keyword(s):  
Red Pine ◽  
Pine Seedlings ◽  
Mineral Phosphate

GROWTH REGULATOR CHANGES IN RELATION TO GROWTH AND DEVELOPMENT OF PINUS RESINOSA AIT.

1966 ◽  
Vol 44 (6) ◽  
pp. 717-738 ◽  
Author(s):  
M. M. Giertych ◽  
D. F. Forward
Keyword(s):  
Red Pine ◽  
Individual Growth ◽  
Growth Promoters ◽  
Female Cone ◽  
Cone Production ◽  
Pine Seedlings ◽  
Pine Trees ◽  
Nitrate Fertilizer ◽  
Change Position ◽  
The Individual

The occurrence of growth regulators and nucleic acids in buds of red pine trees has been investigated in relation to seasonal change, position of the bud in the crown, and age of the tree. The regulators were extracted, separated by chromatography, and assayed by an Avena straight-growth test. Three growth promoters and an inhibitor were found in the buds on all occasions. All of them affected the growth of hypocotyls of red pine seedlings as well as Avena inter-nodes, and none gave an indole reaction. The regulators varied in concentration in relation to season, age, and bud position. The individual growth promoters varied independently, one of them, designated as P1, being more variable than the others. Changes in the inhibitor were frequently, but not invariably, reciprocal to those of P1. There is evidence that individual growth promoters may be concerned with separate aspects of growth. The balance between P1 and the inhibitor was related to extension growth, with the notable exception that a balance favorable to growth reappeared in September, when no growth occurs. RNA concentration declines during the summer and a deficiency of this nucleic acid could be implicated in the cessation of growth.Treatment with ammonium nitrate fertilizer caused a shift from male to female cone production and a localized increase in the number of shoots that developed in the following year. These effects were accompanied by changes in concentration of growth promoters in the buds.

Effects of Herbicides on Respiration of Red Pine Seedlings. II. Monuron, Diuron, DCPA, Dalapon, CDEC, CDAA, EPTC, and NPA

1968 ◽  
Vol 129 (4) ◽  
pp. 286-293 ◽  
Author(s):  
S. Sasaki ◽  
T. T. Kozlowski
Keyword(s):  
Red Pine ◽  
Pine Seedlings

Effects of Hebelomaarenosa on growth of red pine seedlings in high-fertility nursery soil in Wisconsin

1991 ◽  
Vol 21 (4) ◽  
pp. 482-488 ◽  
Author(s):  
J. S. MacFall ◽  
S. A. Slack
Keyword(s):  
Mycorrhizal Colonization ◽  
Red Pine ◽  
High Fertility ◽  
Pine Seedlings ◽  
Greenhouse Tests

Mycorrhizal colonization and growth of red pine (Pinusresinosa Ait.) inoculated with the fungus Hebelomaarenosa Burdsall, MacFall & Albers were investigated in a highly fertile nursery soil. In greenhouse tests, seedlings became mycorrhizal with H. arenosa when inoculum was incorporated throughout the soil to a 1:256 dilution (v/v). Inoculated seedlings had greater root dry weights and root/shoot ratios than noninoculated seedlings. Seedlings that grew in soil where inoculum had been placed around the seeds had greater root dry weights (at a 1:64 dilution) and shoot dry weights (at a 1:4 dilution) than noninoculated seedlings from unpasteurized or pasteurized soil. Hebelomaarenosa inoculum stimulated increased root and shoot dry weights for 2 years compared with noninoculated seedlings mycorrhizal with indigenous fungi. This study supports the hypothesis that H. arenosa can colonize red pine and cause an increase in growth even in highly fertile nursery soils.

Growth and water relations of black locust and pine seedlings exposed to controlled water stress

1983 ◽  
Vol 13 (2) ◽  
pp. 334-338 ◽  
Author(s):  
Paul J. Schulte ◽  
Paul E. Marshall
Keyword(s):  
Polyethylene Glycol ◽  
Water Stress ◽  
Surface Area ◽  
Black Locust ◽  
Dry Weight ◽  
Growth Conditions ◽  
Red Pine ◽  
Polyethylene Glycol 4000 ◽  
Xylem Pressure ◽  
Pine Seedlings

Some responses of very young jack pine (Pinusbanksiana Lamb.), red pine (Pinusresinosa Ait.), and black locust (Robiniapseudoacacia L.) seedlings grown under constant water stress conditions induced by polyethylene glycol 4000 culture solutions were investigated. Seedlings grown under stressful conditions had lower leaf conductance, produced less foliar surface area, and accumulated less dry weight than nonstressed seedlings. Seedlings grown under nonstressed conditions were found to undergo considerable transpiration at night. When compared with the pines, black locust seedlings grew more rapidly, had lower (more negative) xylem pressure potentials, and showed poorer survival under the more stressful growth conditions.

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