scholarly journals EFFECTS OF SOIL TEMPERATURE AND LIGHT INTENSITY ON ROOT GROWTH OF LOBLOLLY PINE SEEDLINGS

1951 ◽  
Vol 26 (1) ◽  
pp. 146-163 ◽  
Author(s):  
Charles W. Barney
Keyword(s):  
Light Intensity ◽  
Root Growth ◽  
Soil Temperature ◽  
Loblolly Pine ◽  
Pine Seedlings

Root Stripping Reduces Root Growth Potential Of Loblolly Pine Seedlings

1990 ◽  
Vol 14 (4) ◽  
pp. 196-199 ◽  
Author(s):  
David B. South ◽  
Nancy J. Stumpff
Keyword(s):  
Root Growth ◽  
Loblolly Pine ◽  
Relative Effect ◽  
Growth Potential ◽  
Root Weight ◽  
Root Growth Potential ◽  
Root Shoot Ratio ◽  
Pine Seedlings ◽  
Pinus Taeda L ◽  
Root Apices

Abstract Stripping short roots from individual loblolly pine (Pinus taeda L.) seedlings was accomplished by pulling the root system through a closed fist either 1, 2, or 4 times. The root growth potential (RGP) of the seedlings was directly related to the intensity of stripping. One stripping removed approximately 2% of the total root weight, yet reduced the number of root apices by 22% and caused a 47% reduction in RGP. Four strippings removed approximately 11% of the root weight, reduced the root/shoot ratio by about 9% and resulted in a 69% reduction in RGP. Although stripping of roots reduced both shoot and root growth, the relative effect on new shoot growth was not as great as with new root growth. Root stripping effectively eliminated any correlation between seedling diameter and RGP. South. J. Appl. For. 14(4):196-199.

Inoculation of loblolly pine seedlings with Fomes annosus in the greenhouse

1969 ◽  
Vol 47 (12) ◽  
pp. 2079-2082 ◽  
Author(s):  
E. G. Kuhlman
Keyword(s):  
Soil Temperature ◽  
Loblolly Pine ◽  
Reliable Method ◽  
Disease Index ◽  
Seedling Mortality ◽  
Pine Seedlings ◽  
Soil Temperatures

A reliable method of inoculating loblolly pine seedlings with Fomes annosus under greenhouse conditions is described. Type of wound, wounding vs. nonwounding, and soil temperature influenced the number of pine seedlings killed. Inoculum weight and orientation of the inoculum block had less effect on mortality. No variation in virulence of eight isolates of the fungus was demonstrated. Seedling mortality occurred at soil temperatures from 10 to 30 °C, but the disease index was highest at 15–25 °C.

Acclimation of cold-stored jack pine and white spruce seedlings: effect of soil temperature on water relation patterns

1985 ◽  
Vol 15 (3) ◽  
pp. 544-550 ◽  
Author(s):  
Steven C. Grossnickle ◽  
Terence J. Blake
Keyword(s):  
Root Growth ◽  
Soil Temperature ◽  
Water Flow ◽  
Flow Resistance ◽  
Stomatal Closure ◽  
White Spruce ◽  
Jack Pine ◽  
Stomatal Opening ◽  
Pine Seedlings ◽  
Soil Temperatures

Cold-stored jack pine (Pinusbanksiana Lamb.) and white spruce (Piceaglauca (Moench) Voss) seedlings were planted in a controlled environmental chamber providing an air temperature of 22 °C and soil temperatures of 22, 16, or 10 °C. After 21 days, observation of root growth for white spruce seedlings was limited at all soil temperatures, whereas jack pine seedlings showed limited root growth at a soil temperature of 10 °C but not at 22 °C. During 21 days of observation after removal from cold storage, stomatal response patterns changed during the transition phase from darkness to first light. Jack pine seedlings showed increasing stomatal opening at first light with greater stomatal opening for seedlings in the 22 °C root-temperature treatment, while all white spruce seedlings exhibited a greater stomatal closure during darkness. In both species, seedlings at lower soil temperatures experienced greater initial water stress than seedlings at higher soil temperatures, the difference being associated with a greater water-flow resistance through the soil–plant–atmosphere continuum (SPAC). In both species, xylem pressure potentials increased with time at all temperatures; a change attributable to a decline in water-flow resistance through the SPAC. The decline in water-flow resistance was possibly due to either a change in the permeability of older suberized roots or, as in jack pine at the higher soil temperature, a significantly greater development of new unsuberized white roots.

Root System Considerations in the Quality of Loblolly Pine Seedlings

1986 ◽  
Vol 10 (2) ◽  
pp. 87-92 ◽  
Author(s):  
W. C. Carlson
Keyword(s):  
Root Growth ◽  
Soil Temperature ◽  
Root System ◽  
Water Uptake ◽  
Loblolly Pine ◽  
Growth Potential ◽  
System Quality ◽  
Root Growth Potential ◽  
Root Volume

Abstract A series of studies was carried out to determine quantitative relationships between root system quality parameters and ability to take up water, and expand the root system into adjacent soil. Root system size, described by displacement of water (i.e., root volume), determines the potential for water uptake prior to new root growth. Seedlings of comparatively high root volume also have superior root growth potential (RGP). After new root growth, the potential for water uptake is proportional to the number of new roots produced. The beginning of rapid root growth after planting is dependent on soil temperature. Root growth potential rank of open-pollinated families can change with soil temperature, which also alters RGP within family. Nursery practices that favor production of seedlings with high root volume and high RGP will increase the quality of seedlings of a given height. South. J. Appl. For. 10:87-92, May 1986.

Effects of soil temperature and water on maize root growth

1988 ◽  
Vol 111 (2) ◽  
pp. 267-269 ◽  
Author(s):  
S. A. Barber ◽  
A. D. Mackay ◽  
R. O. Kuchenbuch ◽  
P. B. Barraclough
Keyword(s):  
Root Growth ◽  
Soil Temperature ◽  
Maize Root

Dynamics of root growth stimulation in Nicotiana tabacum in increasing light intensity

2006 ◽  
Vol 29 (10) ◽  
pp. 1936-1945 ◽  
Author(s):  
KERSTIN A. NAGEL ◽  
ULRICH SCHURR ◽  
ACHIM WALTER
Keyword(s):  
Nicotiana Tabacum ◽  
Light Intensity ◽  
Root Growth ◽  
Growth Stimulation
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