Root growth potential and shoot activity of northern and southern provenances of 1–0 eastern white pine seedlings grown in a Virginia nursery

1988 ◽  
Vol 18 (5) ◽  
pp. 610-614 ◽  
Author(s):  
Kurt H. Johnsen ◽  
Peter P. Feret ◽  
John R. Seiler
Keyword(s):  
Root Growth ◽  
Genetic Control ◽  
Growth Potential ◽  
White Pine ◽  
Eastern White Pine ◽  
Root Growth Potential ◽  
Pine Seedlings ◽  
Southern Half ◽  
Sib Families ◽  
Potential Test

Root growth potential and shoot activity were examined from October until April using northern and southern half-sib families of 1–0 eastern white pine (Pinusstrobus L.) seedlings (grown in a Virginia nursery). There were significant differences in root growth potential between northern and southern provenances and this was apparently due to the larger size of seedlings of southern origin. Heritability estimates indicate that root growth potential is under minimal genetic control in 1–0 eastern white pine seedlings. Southern provenances maintained higher shoot activity at the end of the root growth potential test during the autumn months. By April, northern provenances had surpassed southern provenances in shoot activity. Large differences in shoot activity did not result in large root growth potential differences which may indicate that bud dormancy status does not highly influence root growth potential in 1–0 eastern white pine seedlings.

Root growth potential and bud dormancy of 2 + 0 eastern white pine grown in a Virginia nursery

1989 ◽  
Vol 19 (12) ◽  
pp. 1598-1602
Author(s):  
Kurt H. Johnsen ◽  
Peter P. Feret ◽  
John R. Seiler
Keyword(s):  
Root Growth ◽  
Growth Potential ◽  
Bud Dormancy ◽  
Dormancy Release ◽  
White Pine ◽  
Eastern White Pine ◽  
Root Growth Potential ◽  
Terminal Bud ◽  
Chilling Hours ◽  
The Relationship

Root growth potential and dormancy release index were examined over 2 years using 2 + 0 eastern white pine seedlings grown in a Virginia nursery. Root growth potential patterns were quite different between years. The relationship between dormancy release index and chilling sums (0–7 °C) was consistent between years. Approximately 2800 chilling hours were necessary to break terminal bud dormancy fully. There was a highly significant, positive linear relationship between root growth potential and dormancy release index above a dormancy release index of 0.20 when 2 years data were combined. For dormancy release index values <0.20, the relationship between root growth potential and dormancy release index was inconsistent between years.

Effects of Viterra® Root Dips and Benomyl on Root Growth Potential and Survival of Longleaf Pine Seedlings

1994 ◽  
Vol 18 (1) ◽  
pp. 19-23
Author(s):  
David B. South ◽  
Nancy J. Loewenstein
Keyword(s):  
Root Growth ◽  
Active Ingredient ◽  
Longleaf Pine ◽  
Pinus Palustris ◽  
Growth Potential ◽  
Poor Survival ◽  
Root Growth Potential ◽  
Pine Seedlings ◽  
Clay Slurry

Abstract A mixture of clay and benomyl is registered for use on longleaf pine (Pinus palustris Mill.) to control diseases and increase outplanting survival. However, for one sandy site in Alabama, treating roots with a gel slurry of Viterra containing benomyl reduced survival of stored seedlings when compared to a clay slurry containing benomyl (2.5% active ingredient). Root growth potential for January-lifted seedlings was also reduced by adding benomyl to a Viterra gel. For this study, seedlings planted in January and mid-February had better survival than seedlings planted in December or March. Poor survival in December resulted when seedlings were planted 2 wk prior to a hard freeze. South. J. Appl. For. 18(1):19-23.

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.

Resistance to Cronartiumribicola in Pinusmonticola: Genetic Control of Needle-Spots-Only Resistance Factors

1971 ◽  
Vol 1 (4) ◽  
pp. 197-202 ◽  
Author(s):  
G. I. McDonald ◽  
R. J. Hoff
Keyword(s):  
Genetic Control ◽  
Resistance Mechanism ◽  
Mixed Population ◽  
White Pine ◽  
Resistance Factors ◽  
Pine Seedlings ◽  
Western White Pine ◽  
Recessive Genes ◽  
Sib Families

Full-sib families of western white pine seedlings obtained by crossing phenotypically resistant parents were inoculated with a mixed population of Cronartiumribicola basidiospores. Families segregated into resistant and susceptible plants along patterns suggesting that the needle-spots-only resistance mechanism is controlled by two independent recessive genes.

scholarly journals An Assessment of Cylindrocarpon on Container Western White Pine Seedlings After Outplanting

2000 ◽  
Vol 15 (1) ◽  
pp. 5-7
Author(s):  
R. Kasten Dumroese ◽  
Robert L. James ◽  
David L. Wenny
Keyword(s):  
Root Systems ◽  
Growth Potential ◽  
White Pine ◽  
Root Growth Potential ◽  
Poor Predictor ◽  
Pine Seedlings ◽  
Nursery Stock ◽  
Morphological Criteria ◽  
Western White Pine ◽  
Similar Site

Abstract Cylindrocarpon root disease can destroy root systems of container seedlings. Foresters were concerned that infected nursery stock would perform poorly after outplanting. Root growth potential tests were a poor predictor of disease levels on seedlings that otherwise met standard morphological criteria (height, stem diameter, and firm root plugs) for outplanting. Cylindrocarpon on western white pine persists longer on outplanted stock than Fusarium oxysporum or F. proliferatum on Douglas-fir seedlings on a similar site. Mortality caused by herbivores was as serious a threat to plantation establishment as was mortality caused by all other factors. Our results suggest that western white pine seedlings infected with Cylindrocarpon, but meeting morphological criteria for outplanting, will perform satisfactorily in the field. West. J. Appl. For. 15(1):5-7.

Effect of aluminum on the growth, anatomy, and nutrient content of ectomycorrhizal and nonmycorrhizal eastern white pine seedlings

1995 ◽  
Vol 25 (8) ◽  
pp. 1252-1262 ◽  
Author(s):  
George A. Schier ◽  
Carolyn J. Mcquattie
Keyword(s):  
Root Growth ◽  
Nutrient Content ◽  
Ectomycorrhizal Fungus ◽  
Al Toxicity ◽  
White Pine ◽  
Eastern White Pine ◽  
Solution Ph ◽  
Foliar Symptoms ◽  
Pine Seedlings ◽  
Uptake Of Nutrients

Effect of aluminum (Al) on the growth, anatomy, and nutrient content of eastern white pine (Pinusstrobus L.) was determined by growing newly germinated seedlings for 12 weeks in sand irrigated with nutrient solution (pH 3.8) containing 0, 12.5, 25, 50, 75, or 100 mg/L of Al. To determine the influence of mycorrhizal infection on Al toxicity, half of the seedlings were inoculated with the ectomycorrhizal fungus Pisolithustinctorius (Pers.) Coker & Couch. Across Al concentrations, shoot growth (height, needle length, biomass) but not root growth (lateral root length, biomass) was significantly greater in ectomycorrhizal (ECT) than nonmycorrhizal (NM) seedlings. Aluminum significantly decreased shoot and root growth in ECT and NM seedlings but had less effect on growth in ECT seedlings. Foliar symptoms of Al toxicity (chlorosis, tip necrosis) were more pronounced in NM than in ECT seedlings. Cellular and ultrastructural injury to needles and root meristematic tissues was observed at lower concentrations of Al in NM seedlings than in ECT seedlings. Amelioration of Al toxicity by mycorrhizal colonization appeared to result from enhanced uptake of nutrients, especially P, rather than to reduced uptake of Al.

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