scholarly journals Root electrolyte leakage and root growth potential as indicators of spruce and larch establishment

Silva Fennica ◽  
1998 ◽  
Vol 32 (3) ◽  
Author(s):  
H. McKay
Keyword(s):  
Root Growth ◽  
Electrolyte Leakage ◽  
Growth Potential ◽  
Root Growth Potential ◽  
Root Electrolyte Leakage

Physiological indicators of tolerance to cold storage in Sitka spruce and Douglas-fir seedlings

1991 ◽  
Vol 21 (6) ◽  
pp. 890-901 ◽  
Author(s):  
H. M. McKay ◽  
W. L. Mason
Keyword(s):  
Root Growth ◽  
Cold Storage ◽  
Electrolyte Leakage ◽  
Fine Roots ◽  
Cold Hardiness ◽  
Membrane Damage ◽  
Membrane Integrity ◽  
Growth Potential ◽  
Root Growth Potential ◽  
Plant Vigour

Two-year-old transplants and undercuts of Piceasitchensis (Bong.) Carr. and Pseudotsugamenziesii (Mirb.) Franco were cold-stored (1 °C) for 1 to 7 months ending in April 1989. Their physiological arid morphological condition at lifting and after storage was assessed and related to survival and height increment on a reafforestation site after one growing season. Physiological assessments made between October and April at lifting were root growth potential, tolerance of fine roots to chronic cold, shoot and root mitotic index, root elongation, and electrolyte leakage from the shoot and roots. Shoot cold hardiness was assessed between October and mid-December. The seasonal changes in these parameters and the effect of species and undercutting treatments are described. At lifting, root growth potential identified (i) differences due to species and undercutting treatments and (ii) the earliest possible safe lifting dates of P. menziesii but not of P. sitchensis. After cold storage, plant vigour was assessed by root growth potential and shoot and root membrane integrity. Membrane integrity of the fine roots was a very good indicator of survival. There was a highly significant, negative correlation between the rate of electrolyte leakage, indicating membrane damage, and survival (p ≤ 0.001, r = −0.90).

Electrolyte leakage from fine roots of conifer seedlings: a rapid index of plant vitality following cold storage

1992 ◽  
Vol 22 (9) ◽  
pp. 1371-1377 ◽  
Author(s):  
H.M. McKay
Keyword(s):  
Cold Storage ◽  
Electrolyte Leakage ◽  
Fine Roots ◽  
Fine Root ◽  
Storage Period ◽  
Height Growth ◽  
Growth Potential ◽  
Root Growth Potential ◽  
Root Electrolyte Leakage ◽  
Plant Vitality

Two-year-old Sitka spruce (Piceasitchensis (Bong.) Cam), Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco), and Japanese larch (Larixleptolepis (Sieb. & Zucc.) Gord.) were cold-stored at 1 °C for 1 to 6 months. In April at the end of the cold storage period, root growth potential and electrolyte leakage from the fine roots were assessed and related to plant survival and height growth. After cold storage, seedlings were planted on a second-rotation, cultivated site. In two experiments planted in 1989 and 1990, fine-root electrolyte leakage was closely correlated with survival and height growth. Fine-root leakage has also practical advantages over other available methods of assessing plant vitality after cold storage.

The gravitational forces generated by dropping plants and the response of Sitka spruce seedlings to dropping

1993 ◽  
Vol 23 (11) ◽  
pp. 2443-2451 ◽  
Author(s):  
H.M. McKay ◽  
B.A. Gardiner ◽  
W.L. Mason ◽  
D.G. Nelson ◽  
M.K. Hollingsworth
Keyword(s):  
Root Growth ◽  
Electrolyte Leakage ◽  
Field Experiments ◽  
Sitka Spruce ◽  
Growth Potential ◽  
Total Force ◽  
Triphenyl Tetrazolium Chloride ◽  
Root Growth Potential ◽  
Tetrazolium Chloride ◽  
Reduction Activity

Two-year-old Sitka spruce (Piceasitchensis (Bong.) Carr.) seedlings were lifted from the nursery at different times of the year and subjected to known forces by dropping bags of plants from a height of 10, 100, or 300 cm onto a concrete floor for a varying number of times (0 to 135). The response of the seedlings to dropping was assessed by their growth and survival in field experiments, root growth potential, root electrolyte leakage, and triphenyl tetrazolium chloride reduction. The forces were measured by attaching an accelerometer linked to an oscilloscope to the root collar of trees in the centre of each bag. Typically the forces generated by a 10-cm drop were about 11 g, while those generated by a 300-cm drop were about 140 g. All seedlings lifted in mid-February and mid-March survived one growing season in a cultivated, weed-free nursery soil, but height growth was significantly reduced by 300-cm drops. The survival of seedlings lifted in August was reduced by 5 and 15 drops particularly from 300 cm. Root growth potential was decreased while electrolyte leakage and triphenyl tetrazolium chloride reduction activity of the fine roots 2 days after dropping were increased by dropping. Growth and physiological differences associated with dropping were more closely and frequently correlated with the maximum force exerted than to the mean or the total force.

The physiological responses of oak seedlings to warm storage

2005 ◽  
Vol 35 (10) ◽  
pp. 2413-2422 ◽  
Author(s):  
Raquel Cabral ◽  
Conor O'Reilly
Keyword(s):  
Root Growth ◽  
Physiological Responses ◽  
Storage Period ◽  
Field Performance ◽  
Growth Potential ◽  
Pressure Potential ◽  
Root Growth Potential ◽  
Xylem Pressure ◽  
Xylem Pressure Potential ◽  
Root Electrolyte Leakage

The effects of warm storage (15 °C) on the physiological responses and subsequent field performance of 2-year-old oak (Quercus robur L.) seedlings that had been cold (1–2 °C) stored until May were assessed. Shoot xylem pressure potential, shoot water content, shoot tip dry mass, root electrolyte leakage, and root growth potential were evaluated at regular intervals during the 21-day warm storage period. The date of lifting to cold storage had little effect on the physiological responses to warm storage. Root electrolyte leakage increased after 7 days of storage, despite the fact that root growth potential and survival were unaffected. Values then increased further before decreasing again by the end of the 21-day storage period to values similar to those recorded after 0 or 7 days of storage. Storage for up to 21 days greatly reduced root growth potential and shoot quality after planting in the field. The shoot xylem pressure potential of seedlings declined during the early stage of warm storage, but then increased to values similar to those recorded after cold storage. Shoot water content increased during the early storage period, then declined slightly, but values were higher after 21 days of storage than at the time of placement in warm storage. While most physiological responses fluctuated in a consistent manner, these changes were not necessarily predictable. Root growth potential was a good indicator of plant field performance potential, but the other physiological parameters were less useful to this end.

Root System Fibrosity of Sitka Spruce Transplants: Relationship with Root Growth Potential

1990 ◽  
Vol 63 (1) ◽  
pp. 1-7 ◽  
Author(s):  
J. D. DEANS ◽  
C. LUNDBERG ◽  
M. G. R. CANNELL ◽  
M. B. MURRAY ◽  
L. J. SHEPPARD
Keyword(s):  
Root Growth ◽  
Root System ◽  
Sitka Spruce ◽  
Growth Potential ◽  
Root Growth Potential

scholarly journals Root Growth Potential and Microsite Effects on Conifer Seedling Establishment in Northern Idaho

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 597
Author(s):  
Jacob A. Reely ◽  
Andrew S. Nelson
Keyword(s):  
Root Growth ◽  
Douglas Fir ◽  
Seedling Quality ◽  
Growth Potential ◽  
Larix Occidentalis ◽  
Root Growth Potential ◽  
Western Larch ◽  
Neighborhood Conditions ◽  
Seedling Performance ◽  
Survival And Growth

Environmental conditions and seedling quality interact to produce complex patterns of seedling survival and growth. Root growth potential (RGP) is one metric of seedling quality that can be rapidly measured prior to planting, but the correlation of RGP and seedling performance is not consistent across studies. Site factors including microsite objects that cast shade and competing vegetation can also influence seedling performance. We examined the effects of RGP, presence/absence of a microsite object, and competition cover on the survival and growth of three native conifers to the Inland Northwest, USA, over 5 years. We found that RGP had no effect on the survival or growth of western larch (Larix occidentalis), Douglas fir (Pseudotsuga menziesii var. glauca), and grand fir (Abies grandis) at a mesic north aspect site and a xeric south aspect site. Comparatively, the presence of a microsite increased the odds of survival by 37% for western larch and 158% for grand fir, while the absence of forb cover increased the odds of survival of western larch by 72% and of grand fir by 26%. Douglas fir was less sensitive to microsites and competition. The strong effects of neighborhood conditions around seedlings help inform silvicultural practices to enhance the establishment of western larch and grand fir, including planting seedlings near shading objects and competition control, while these practices may not be as important for Douglas fir.

Seed spacing and seedling biomass: Effect on root growth potential of loblolly pine (Pinus taeda)

New Forests ◽  
1990 ◽  
Vol 4 (3) ◽  
pp. 179-192 ◽  
Author(s):  
David B. South ◽  
Harry S. Larsen ◽  
James N. Boyer ◽  
Hans M. Williams
Keyword(s):  
Root Growth ◽  
Pinus Taeda ◽  
Loblolly Pine ◽  
Growth Potential ◽  
Root Growth Potential ◽  
Seedling Biomass ◽  
Seed Spacing
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