Effects of Chronic Doses of Ozone on Field-Grown Loblolly Pine: Seedling Responses in the First Year

Shafer, Steven R.; Heagle, Allen S.; Camberato, Diane M.

doi:10.1080/08940630.1987.10466312

Cited by 11 publications

(9 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Net CO^ assimilation was also reduced at the highest ozone level (Richardson, personal communication). Similar results have been obtained in other studies (Shafer et al, 1987;Sasek & Richardson, 1989;Shafer & Heagle, 1989). Adams et al (19906) and Edwards et al (1991) did not find a negative ozone effect on diameter growth and found even an increase in pigment content (Edwards et al, 1990).…”

Section: Discussionsupporting

confidence: 81%

“…Respiration rate was also found to differences in susceptibility of different half-sib increase under ozone exposure (Barnes, 1972a; families to ozone have been detected (Kress, Skelly Adams, Edwards & Taylor, 1990a). & Hinkelmann, 1982;Shafer et al, 1987). Based on While reductions in needle starch content have these findings ozone is considered to be responsible been found, no ozone-related effects on roots have for growth reduction in loblolly pine at the low been observed (Meier et aL, 1990).…”

Section: Introductionmentioning

confidence: 99%

“…needles, and found that the Using a diagnostic gas exchange technique it could growth of loblolly pine was suppressed after ex-be demonstrated that ozone decreased apparent posure to ozone at 50 nl T^ for six hours per day for quantum yield and the photosynthetic capacity, 28 consecutive days. Since then many studies have suggesting effects on biochemical processes rather demonstrated ozone-related growth reduction in than affecting gas phase conductance to COj (Hanloblolly pine (Shafer, Heagle & Camberato, 1987;son, McLaughlin & Nelson, 1988;Sasek & RichardMeier e< a/., 1990;Edwards e? a/., 1991).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of ozone on foliar nitrogen metabolism of Pinus taeda L. and implications for carbohydrate metabolism

1992

View full text Add to dashboard Cite

SUMMARYDose-response relationship of ozone effects on foliar nitrogen metabolism of two half-sib families of Pinus taeda L. was studied. Trees were exposed to six ozone concentrations, ranging from 0 2 to 3 times the ambient, for two consecutive growing seasons (1988 and 1989) in open-top chambers. Content of total chlorophyll, soluble protein and soluble amino acids, and activities of glutamine synthetase and glutamate dehydrogenase, were measured in second-flush needles of 1989, harvested in November of 1989. Root collar diameter growth rate was also determined. Variation in depth to soil mottling, an indicator of changing redox conditions, significantly affected tree growth and nitrogen metabolism. Therefore depth to soil mottling was used as a covariate and dose-response curves were provided with adjusted means. A decline of root collar diameter growth rate and foliar chlorophyll content was found at the highest ozone level. However, both these parameters were affected much more by soil conditions than by ozone. Glutamine synthetase, glutamate dehydrogenase and amino acids, especially glutamate and glutamine, increased by approx. 2-fold and 3-fold, respectively, at two and three times ambient ozone. However, soluble protein content was only affected at the highest ozone concentration, showing a 2-5-fold increase. Nitrogen metabolism was more influenced by ozone than by the variation in edaphic conditions. No consistent ozone X family interaction on nitrogen metabolism could be found, but the two half-sib families significantly differed in glutamate dehydrogenase activity and the contents of glutamate and glycine, indicating a regulatory function of this enzyme between nitrogen and carbon metabolism. The increase of amino-N turnover and the following rise in soluble protein content are explained by the strategy of the plant to reallocate the nutrients from needles subjected to accelerated senescence by ozone. Possible implications of this process in carbohydrate metabolism and carbon partitioning are discussed.

show abstract

Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of ozone on foliar nitrogen metabolism of Pinus taeda L. and implications for carbohydrate metabolism

1992

View full text Add to dashboard Cite

show abstract

“…A decrease in growth has been observed in conifers which have been exposed to above-ambient concentrations of ozone during short-term fumigations (Kress & Skelly, 1982;Hogsett et al, 1985;Krause, Jung & Prinz, 1985;Shafer, Heagle & Camberato, 1987;Adams, Kelly & Edwards, 1988). The impact of ozone on different forest ecosystems is not yet clear.…”

Section: Introductionmentioning

confidence: 99%

Long‐term exposure of Norway spruce, Picea abies (L.) Karst., to ozone in open‐top chambers

1990

View full text Add to dashboard Cite

SUMMARYRates of net photosynthesis were measured on Norway spruce, Picea abies (L.) Karst. exposed to three different concentrations of ozone for three seasons in open-top chambers. The treatments were non-filtered air + ozone (NF + ), non-filtered air (NF) and charcoal-filtered air (CF). Ozone was added daily between 11.00-18.00 local time. The study was performed during September and October, 1987. The rate of net photosynthesis was determined using an infrared gas analyser (IRGA) connected to a small cuvette, which was equipped with an artificial light source for unilateral illumination. The measurements were made on shoots of three different age classes: current year, 1 year old and 2 years old. Measurements took place at saturating light intensity (1150/^mol m"^ s^^), at a temperature of 16-6±0-7°C, and at a relative humidity of 67-5 + 5-3%. In current-year shoots the rate of net photosynthesis expressed on a needle-area basis was lowest in the CF treatment and highest in the NF treatment. In 1-and 2-year-old shoots, a decreased rate of the net photosynthetic assimilation rate, expressed on a needle area basis, was observed in trees from the NF and NF+ treatment compared with that of trees from the CF treatment. The effect increased with increasing ozone concentration and shoot age. A significant increase in the rate of respiration, expressed on a dry-weight basis, was observed in current year shoots from trees exposed to NF + . A significant decrease of the leaf conductance to carbon dioxide was obtamed m 2-year-old shoots exposed to NF and NF + . A decrease in the content of chlorophyll was observed in 1-and 2-year-old needles from trees exposed to NF+.

show abstract

“…Crop loss from ambient ozone is well documented (Heck et al, 1984a, 6) as are impacts on forest tree species of the timberlands of the South Eastern USA (Pye, 1988). Growth of loblolly pine, one of the most important forest species in this area, is reduced by ozone (Shafer, Heagle & Camberato, 1987;Kress et al, 1989). Ozone and acid rain effects on several half sib families of loblolly pine are being tested at the Duke Forest Site near Durham, North Carolina.…”

Section: Introductionmentioning

confidence: 99%

Ozone effects on the fatty acid composition of loblolly pine needles (Pinus taeda L.)

Fangmeier¹,

Kress

Lepper³

et al. 1990

New Phytologist

View full text Add to dashboard Cite

SUMMARYLoblolly pine trees were fumigated with ozone in open-top chambers and the fatty acid content of the needles was analysed. Fatty-acid composition depended on needle age. Ozone effects also differed with needle age. In needles treated during the needle elongation period, ozone fumigation decreased the Cj^.g and increased the Cjg.j ^nd Cjg.j content. In needles already elongated before ozone treatment was initiated, fatty acid content decreased. The results suggest different pathways of ozone attack in elongated and elongating needles. No differences in response to ozone were found for fatty acids in needles of four different half sib families.

show abstract

Effects of Chronic Doses of Ozone on Field-Grown Loblolly Pine: Seedling Responses in the First Year

Cited by 11 publications

References 9 publications

Effects of ozone on foliar nitrogen metabolism of Pinus taeda L. and implications for carbohydrate metabolism

Effects of ozone on foliar nitrogen metabolism of Pinus taeda L. and implications for carbohydrate metabolism

Long‐term exposure of Norway spruce, Picea abies (L.) Karst., to ozone in open‐top chambers

Ozone effects on the fatty acid composition of loblolly pine needles (Pinus taeda L.)

Contact Info

Product

Resources

About