scholarly journals Ethylene production by different age class ponderosa and Jeffery pine needles as related to ozone exposure and visible injury

Trees ◽  
1992 ◽  
Vol 6 (4) ◽  
Author(s):  
FrankW. Telewski
Keyword(s):  
Ethylene Production ◽  
Pine Needles ◽  
Ozone Exposure ◽  
Visible Injury ◽  
Age Class

scholarly journals Volatile Oil Content of Scots Pine Needles (Pinus sylvestris L.)

2016 ◽  
Vol 21 (1-2) ◽  
pp. 141-147
Author(s):  
Monika Sporek
Keyword(s):  
Old Age ◽  
Scots Pine ◽  
Oil Content ◽  
Volatile Oil ◽  
Pine Needles ◽  
Volatile Oils ◽  
Age Class ◽  
The Mean ◽  
Class Iib ◽  
Scots Pine Needles

AbstractThis study focused on how the concentration of volatile oils in Scots Pine needles varied in relation to the age of the trees, the age of the needles and their location within the canopy. Study material were pine needles from 15-, 44- and 89-year-old pine stands. The mean content of oils increased with the age of trees. The averaged oil content in needles was: 0.46% in the 15-year-old stand, 0.55% in the 44-year-old and 0.61% in the 89-year-old stands. The mean content of volatile oils decreased with the age of the needles. 1-year-old needles contained the highest concentration of volatile oils (0.56%), and the 3-year-old needles contained the least (0.48%). In 15-year-old stands the oil content in needles increased linearly with their height in the canopy. In 44-year-old (age class IIb) and 89-year-old (age class Va) stands oil content was greater lower in the canopy than in the middle.

EFFECTS OF OZONE ON GROWTH OF FOUR WOODY ORNAMENTAL PLANTS

1978 ◽  
Vol 58 (3) ◽  
pp. 769-773 ◽  
Author(s):  
G. P. LUMIS ◽  
D. P. ORMROD
Keyword(s):  
Ornamental Plants ◽  
Shoot Elongation ◽  
Ozone Exposure ◽  
Visible Injury ◽  
White Cedar ◽  
Chlorophyll Contents ◽  
Low Level ◽  
Chlorophyll A And B ◽  
High Level ◽  
Stimulation Of

Ozone exposure of coniferous plants during their second growing season for 4 consecutive days per week for 6 or 7 wk resulted in stimulation of shoot elongation in three of four species. No visible injury symptoms were noted. Compared to control plants, Pfitzer juniper and dense yew elongated significantly more at a low level (10 pphm for 4 wk and 20 pphm from week five to 6 or 7 wk) while white cedar elongated more at a high level (20 pphm for 4 wk and 40 pphm from week five to 6 or 7 wk). Elongation of tamarix juniper with no ozone exceeded that at either the low or the high level of exposure. Shoot elongation at the high level was equal to or less than that with no ozone for all species but white cedar. Plants exposed to the high level of ozone had generally lower chlorophyll contents, while the low level of ozone significantly increased chlorophyll a and b in Pfitzer juniper.

Growth response of two varieties of slash pine seedlings to chronic ozone exposures

1985 ◽  
Vol 63 (12) ◽  
pp. 2369-2376 ◽  
Author(s):  
W. E. Hogsett ◽  
M. Plocher ◽  
V. Wildman ◽  
D. T. Tingey ◽  
J. P. Bennett
Keyword(s):  
Ozone Concentration ◽  
Growth Response ◽  
Growth Parameters ◽  
Growth Curves ◽  
Dry Weight ◽  
Pinus Elliottii ◽  
Exposure Period ◽  
Ozone Exposure ◽  
Visible Injury ◽  
Pine Seedlings

Two geographical varieties of Pinus elliottii (Engelm.) seedlings, elliottii and densa, were exposed continuously to two daily peak exposure profiles of ozone having 7-h (0900–1600) seasonal means of 0.104 and 0.076 ppm and charcoal-filtered air over a 112-day period. The profiles represented a daily rise and decline of hourly ozone concentration. They were constructed with a daily hourly maximum, which for one profile (0.126 μL/L) exceeded the current ozone standard daily; the standard was not exceeded for the other profile (0.094 μL/L). Destructive harvests at 7-day intervals over the exposure period were employed to assess visible injury and to construct growth curves for stem diameter, plant height, top and root dry weight, and needle number and length. The visible injury was slight, yet all the growth parameters decreased significantly with time and ozone concentration; root growth was the most severely impacted. The observed growth response and visible injury of the two varieties were similar. Seed germination was not affected by ozone exposure.

scholarly journals Mango Tolerance to Reduced Oxygen Levels in Controlled Atmosphere Storage

2000 ◽  
Vol 125 (6) ◽  
pp. 707-713 ◽  
Author(s):  
Renar J. Bender ◽  
Jeffrey K. Brecht ◽  
Steven A. Sargent ◽  
Donald J. Huber
Keyword(s):  
Ethanol Production ◽  
Ethylene Production ◽  
Mangifera Indica ◽  
Inhibitory Effect ◽  
Mango Fruit ◽  
Visible Injury ◽  
Total Sugars ◽  
Atmosphere Storage ◽  
Storage Times ◽  
Better Than

`Haden' and `Tommy Atkins' mangoes (Mangifera indica L.) were stored in air, 2, 3, 4 or 5 kPa O2 plus N2, or 25 kPa CO2 plus air for 14 days at 15 °C or 21 days at 12 °C, respectively, then in air for 5 days at 20 °C to determine their tolerance to reduced O2 levels for storage times encountered in typical marine shipments. All low O2 treatments reduced mature green mango respiration (CO2 production), however, elevated ethanol production occurred in 2 and 3 kPa O2 storage, with the levels two to three times higher in `Tommy Atkins' than `Haden'. In contrast, `Haden' fruit at the onset of the climacteric also accumulated ethanol in 4 kPa O2 and produced 10 to 20-fold more ethanol in 2 and 3 kPa O2 than preclimacteric fruit. While there were no visible injury symptoms, off flavor developed in mature green fruit at 2 kPa O2 and in ripening initiated fruit at 2 and 3 kPa O2. Ethanol production was not affected by storage in 25 kPa CO2. Ethylene production was reduced slightly by low O2, however, `Haden' fruit also showed a residual inhibitory effect on ethylene production after 2 or 3 kPa O2 storage, while `Tommy Atkins' fruit stored in 2 kPa O2 produced a burst of ethylene upon transfer to air at 20 °C. Fruit firmness, total sugars, and starch levels did not differ among the treatments, but 2, 3 or 4 kPa O2 and 25 kPa CO2 maintained significantly higher acidity than 5 kPa O2 or air. The epidermal ground color responded differently to low O2 and high CO2 in the two mango cultivars. Only 2 kPa O2 maintained `Haden' color better than air, while all low O2 levels maintained `Tommy Atkins' color equally well and better than air. High CO2 was more effective than low O2 in maintaining `Haden' color, but had about the same effect as low O2 on `Tommy Atkins'. Results indicate that preclimacteric `Haden' and `Tommy Atkins' mango fruit are able to tolerate 3 kPa O2 for 2 or 3 weeks at 12 to 15 °C and that tolerance to low O2 decreases as mangoes ripen. Results also show that low O2 and high CO2 affect mango ripening differentially.

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