The influence of night temperature under declining photoperiod on bud initiation in black spruce seedlings

1989 ◽  
Vol 19 (2) ◽  
pp. 274-275 ◽  
Author(s):  
K. D. Odlum ◽  
S. J. Colombo
Keyword(s):  
Plant Growth ◽  
Black Spruce ◽  
Day Length ◽  
Night Temperature ◽  
Container Seedlings ◽  
Growth Chambers ◽  
Bud Initiation

The effect of night temperature on the speed of bud initiation in black spruce (Piceamariana (Mill.) B.S.P.) container seedlings was studied. Day lengths were progressively shortened in plant growth chambers to simulate the natural day-length decline that occurs in the fall at latitude 48°N. During the period of day-length decline a constant 26 °C day temperature was maintained, while night temperatures of 5, 7.5, 10, 14, 18, 22, 24, or 26 °C were imposed. When the night temperature was 10–24 °C, first signs of bud initiation were observed in 12–15 days, while 100% bud initiation was attained in 15–22 days. When the night temperature was 5, 7.5, or 26 °C, first bud initiation was observed in 15–22 days, while 100% bud initiation was not attained until 40 days.

Effect of temperature on needle anatomy and transpiration of Piceamariana after bud initiation

1990 ◽  
Vol 20 (5) ◽  
pp. 598-601 ◽  
Author(s):  
N. B. Vanhinsberg ◽  
S. J. Colombo
Keyword(s):  
Black Spruce ◽  
Effect Of Temperature ◽  
Cuticular Transpiration ◽  
Container Seedlings ◽  
Needle Anatomy ◽  
Effects Of Temperature ◽  
Cuticle Thickness ◽  
Bud Initiation

Six-month-old black spruce (Piceamariana (Mill.) B.S.P.) container seedlings were placed in either a cool (18 ± 4: 6 ± 4 °C, light:dark) or a warm (26 ± 3: 18 ± 2 °C, light:dark) hardening regime for 12 weeks after bud initiation to assess the effects of temperature on needle maturation and transpiration. Stomatal transpiration was greater in warm-hardened seedlings than in cool-hardened seedlings. Cuticular transpiration was found to be greater in cool-hardened excised shoots than in warm-hardened shoots. Needle cuticle thickness increased in seedlings exposed to both warm and cool temperatures, however, cuticular growth after bud initiation was greater in the warm-hardening regime.

Cyclamen Leaf Unfolding Rate in Response to Temperature

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 447d-447
Author(s):  
Meriam Karlsson ◽  
Jeffrey Werner
Keyword(s):  
Day Length ◽  
Leaf Number ◽  
Cyclamen Persicum ◽  
Flower Buds ◽  
Flower Bud ◽  
Leaf Unfolding ◽  
Significant Difference ◽  
Number Of Leaves ◽  
Growth Chambers ◽  
Response To Temperature

Nine-week-old plants of Cyclamen persicum `Miracle Salmon' were transplanted into 10-cm pots and placed in growth chambers at 8, 12, 16, 20, or 24 °C. The irradiance was 10 mol/day per m2 during a 16-h day length. After 8 weeks, the temperature was changed to 16 °C for all plants. Expanded leaves (1 cm or larger) were counted at weekly intervals for each plant. The rate of leaf unfolding increased with temperature to 20 °C. The fastest rate at 20 °C was 0.34 ± 0.05 leaf/day. Flower buds were visible 55 ± 7 days from start of temperature treatments (118 days from seeding) for the plants grown at 12, 16, or 20 °C. Flower buds appeared 60 ± 6.9 days from initiation of treatments for plants grown at 24 °C and 93 ± 8.9 days for cyclamens grown at 8 °C. Although there was no significant difference in rate of flower bud appearance for cyclamens grown at 12, 16, or 20 °C, the number of leaves, flowers, and flower buds varied significantly among all temperature treatments. Leaf number at flowering increased from 38 ± 4.7 for plants at 12 °C to 77 ± 8.3 at 24 °C. Flowers and flower buds increased from 18 ± 2.9 to 52 ± 11.0 as temperature increased from 12 to 24 °C. Plants grown at 8 °C had on average 6 ± 2 visible flower buds, but no open flowers at termination of the study (128 days from start of treatments).

scholarly journals Continuous Lighting Reduces Conidial Production and Germinability in the Rose Powdery Mildew Pathosystem

Plant Disease ◽  
2010 ◽  
Vol 94 (3) ◽  
pp. 339-344 ◽  
Author(s):  
A. Suthaparan ◽  
Arne Stensvand ◽  
S. Torre ◽  
Maria L. Herrero ◽  
R. I. Pettersen ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Disease Severity ◽  
Interspecific Hybrid ◽  
Day Length ◽  
Artificial Light ◽  
Potted Plants ◽  
Severity Of Disease ◽  
Detached Leaves ◽  
Growth Chambers ◽  
The Rose

The effect of day length on production and germinability of conidia and severity of disease caused by Podosphaera pannosa, the causal agent of rose powdery mildew, was studied. Whole potted plants or detached leaves of Rosa interspecific hybrid ‘Mistral’ were inoculated with P. pannosa and exposed to 0, 12, 18, 20, 22, or 24 h of artificial light per day in growth chambers equipped with mercury lamps. Increasing duration of illumination from 18 to 20 to 24 h per day reduced production of conidia by 22 to 62%. Exposure to 24 h of illumination per day also strongly reduced disease severity compared with 18 h. Our results suggest that increasing day lengths from 18 h per day to 20 to 24 h may suppress the disease significantly and, thereby, reduce the need for fungicide applications against powdery mildew.

Further aspects of the artificial illumination of plant growth chambers

1965 ◽  
Vol 10 (3) ◽  
pp. 212-229 ◽  
Author(s):  
G.A. Carpenter ◽  
L.J. Moulsley ◽  
P.A. Cottrell ◽  
R. Summerfield
Keyword(s):  
Plant Growth ◽  
Artificial Illumination ◽  
Growth Chambers

scholarly journals Effects of growing temperatures and day length on flower bud initiation and development in sweet pepper.

1990 ◽  
Vol 28 (4) ◽  
pp. 155-164
Author(s):  
Yukihiro FUJIME ◽  
Fu-Chang GUO ◽  
Kazumasa KAKIBUCHI ◽  
Tadahiko HIROSE
Keyword(s):  
Sweet Pepper ◽  
Day Length ◽  
Flower Bud ◽  
Bud Initiation

scholarly journals Air-Turbulence and Temperature Gradients Reduced in Plant Growth Chambers by Small-Hole Diffuser Walls

BioScience ◽  
1967 ◽  
Vol 17 (1) ◽  
pp. 37-37
Author(s):  
L. E. Browne ◽  
J. L. Noey ◽  
Pat C. Kerr ◽  
Alan H. Haber
Keyword(s):  
Plant Growth ◽  
Temperature Gradients ◽  
Small Hole ◽  
Air Turbulence ◽  
Growth Chambers
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