Relationship between foliar composition of red-pine and jack-pine seedlings and vulnerability to Lophodermium needle-cast disease

1971 ◽  
Vol 35 (1-3) ◽  
pp. 213-215 ◽  
Author(s):  
J. G. Iyer ◽  
E. E. Schulte ◽  
G. W. Randall
Keyword(s):  
Jack Pine ◽  
Red Pine ◽  
Needle Cast ◽  
Pine Seedlings

scholarly journals Resistance of Pinus banksiana to the European race of Gremmeniella abietina

2005 ◽  
Vol 81 (2) ◽  
pp. 49-55 ◽  
Author(s):  
G. Laflamme ◽  
R. Blais
Keyword(s):  
Distinctive Feature ◽  
Pinus Banksiana ◽  
Pinus Resinosa ◽  
Jack Pine ◽  
Red Pine ◽  
The North ◽  
Pine Seedlings ◽  
Pine Trees ◽  
European Race ◽  
Low Incidence

In the early 1980s, more than 90% of mortality caused by Gremmeniella abietina, European race, was recorded in red pine (Pinus resinosa) plantations 200 km northwest of Montreal, Quebec, Canada. Surrounding jack pines (Pinus banksiana) did not appear to be affected. Consequently, foresters began to plant the affected areas with jack pine seedlings. In 1988, plots of 100 jack pines were established in three of the four selected plantations. As reference, red pine seedlings were planted in 1989 under similar conditions in the fourth plantation. Observations were carried out annually from 1989 to 1992. Mortality of red pine seedlings reached 70% in 1992 while all jack pines on the three experimental sites were free of the disease except for a tip blight, a distinctive feature allowing race identification in the field. The North American race symptoms were present at a very low incidence, but began to increase on site I in 1992. More than 10 years after planting, the jack pine trees still show resistance to the European race of G. abietina while all the red pines died.

The effect of sonication on the growth of some tree seeds

1981 ◽  
Vol 11 (4) ◽  
pp. 840-844 ◽  
Author(s):  
Pearl Weinberger ◽  
C. Burton
Keyword(s):  
Tree Species ◽  
Peak Velocity ◽  
Jack Pine ◽  
Red Pine ◽  
The Other ◽  
Pine Seedlings ◽  
Length Range ◽  
Percent Germination ◽  
Tree Seeds ◽  
All Treatment

Air-dry seeds of jack pine (Pinusbanksiana Lamb.), red pine (P. resinosa Ait.), tamarack (Larixeuropaea L.), and white spruce (Piceaglauca (Moench) Voss) were subjected for 30 min to 1 MHz ultrasound at one of three intensities of ultrasound ranging from 0.5 to 6.0 W/cm2. Subsequent germination was assessed in terms of percent germination, mean daily germination (MDG), and peak velocity of germination (PV). From these, germination values (GV) were obtained. Only jack pine responded to the ultrasonic treatments by giving rise to higher MDG and GV values. The seeds were equally stimulated by all the intensities used. The rates and percent germination of the other tree species were unaffected by any of the sonication treatments. Seeds of jack pine were also sonicated at 25, 50, 100, 250, and 750 kHz at an intensity in the range of 0.5–1.0 W/cm2. None of these treatments affected the course of germination.Subsequent seedling growth of all the seeds in all treatment sets was also monitored by summing the total length of all the seedlings following 8 and 14 days of growth. The seedlings were divided into five length-range categories. The jack pine seedlings alone, sonicated at 1 MHz, had significantly more seedlings in the larger size group than the untreated seedlings.

Root development of container-reared, nursery-grown, and naturally regenerated pine seedlings

1983 ◽  
Vol 13 (2) ◽  
pp. 239-245 ◽  
Author(s):  
T. J. Nichols ◽  
A. A. Alm
Keyword(s):  
Root Systems ◽  
System Size ◽  
Jack Pine ◽  
Red Pine ◽  
Root Weight ◽  
Sectional Area ◽  
Cross Sectional ◽  
Stem Size ◽  
Pine Seedlings ◽  
Highly Correlated

Root systems of 6- to 10-year-old red pine (Pinusresinosa Ait.) and jack pine (Pinusbanksiana Lamb.) trees reared in various containers were excavated from four different sites and studied. Nursery-grown and naturally regenerated trees of similar age and stem size growing on the same sites were used for comparison. Root cross-sectional area (RCSA) taken 5 cm from the stem, a measurement found to be highly correlated (r = 0.94) with root weight (In–In transformation), was used to describe root system size. The average RCSA's of jack pine reared in paper pots, book planters, and nonribbed styroblock-2 containers were smaller than those of naturally regenerated seedlings, but the differences were not statistically significant. Jack pine and red pine reared in Ontario tubes had significantly larger RCSA's than nursery-grown trees. There were some differences in radial distribution of horizontal roots, and the apportionment between horizontal and vertical root components differed between some of the seedling types.

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.

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

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.

Estimation de la production de jeunes plantations de pin rouge et de pin gris du sud du Québec

1976 ◽  
Vol 6 (4) ◽  
pp. 478-486 ◽  
Author(s):  
H. A. Bolghari
Keyword(s):  
Multiple Regression ◽  
Jack Pine ◽  
Red Pine ◽  
Pine Plantations ◽  
Regression Equations ◽  
Pine Plantation ◽  
South Shore ◽  
Pine Stands ◽  
Natural Stands ◽  
St Lawrence River

Multiple regression equations have been developed to predict yield from young red pine and jack pine plantations. Data from 446 sample plots representing young red pine and jack pine stands located on the south shore of the St. Lawrence River between Quebec and Montreal were analysed. The red pine plantation yielded more than the jack pine. However, in plantation both species yield more than in natural stands. Taking into account the age and spacing of the sampled plantations, the equation obtained can provide information on yield of red pine and jack pine stands the maximum spacing of which is 3 × 3 m, up to the age of 45 and 35 years respectively. The equations will allow the construction of preliminary yield tables for both species.

Pathogenicity of Bursaphelenchusxylophilus on three species of pine

1987 ◽  
Vol 17 (1) ◽  
pp. 51-57 ◽  
Author(s):  
P. J. Bedker ◽  
M. J. Wingfield ◽  
R. A. Blanchette
Keyword(s):  
Jack Pine ◽  
Red Pine ◽  
Pine Wood Nematode ◽  
Pine Wood ◽  
Water Extracts ◽  
Pine Trees ◽  
Branch Death

Three species of 11-year-old pine trees were inoculated with Bursaphelenchusxylophilus in the field. Four branches in single whorls on red, Scots, and jack pine trees were wounded and inoculated with 10 000 nematodes each or with water extracts from Botrytiscinerea cultures. Prior to field inoculations, the pathogenicity of the nematode isolate was confirmed on seedlings in the greenhouse. Fourteen weeks after inoculation, 27 of 80 and 13 of 52 branches were dead or dying on Scots and jack pine trees, respectively. No symptoms were observed on red pine trees inoculated with B. xylophilus or on any controls. Branch death was attributed to the formation of girdling cankers resulting from inoculation. An average of 9.14, 10.39, and 0.02 nematodes were extracted per gram of wood from branch samples collected from Scots, jack, and red pine trees at 14 weeks, respectively, and at 58 weeks an average of 13.82, 1.01, and 0.05 nematodes per gram of wood sampled were recovered. Proportions of branch samples with nematodes declined from 14 to 58 weeks after inoculation. Although limited mortality of branches occurred, the pine wood nematode was not found to cause tree death following inoculation.

Applied gibberellin A4/7 increases ovulate strobili production in accelerated growth jack pine seedlings

1981 ◽  
Vol 11 (3) ◽  
pp. 580-585 ◽  
Author(s):  
Robert A. Cecich
Keyword(s):  
Growth Conditions ◽  
Jack Pine ◽  
Fourfold Increase ◽  
Pine Seedlings ◽  
Accelerated Growth

Jack pine (Pinusbanksiana Lamb.) seeds were sown in October, January, and March, and the seedlings were cultured under accelerated growth conditions in a greenhouse. At biweekly intervals, from May 15 to August 15, they were transplanted to a nearby nursery and sprayed with GA4/7 or GA4/7 + NAA. The following spring a fourfold increase in flowering was noted in trees receiving either of the GA4/7 treatments. Trees in the March sowing did not flower. The data suggest that the increased flowering was caused by GA4/7-mediated differentiation of lateral long-branch primordia into ovulate strobili.

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