The effects of ethylenediurea and sodium erythorbate on photosynthetic function of ozone-exposed loblolly pine seedlings /
1030 ppm may retard stomatal closure in younger pine
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | 1030 ppm may retard stomatal closure in younger pine all ozone levels except 1.5X ambient ozone. Foliage treated ambient ozone levels in east Texas for the season (compared and chloroplast pigment content (chlorophyll a and b, and approximate ambient (NF), 1.5Y,, 2.OX, or 2.5X ambient ozone but over time, as ambient ozone levels declined, ozone CF and NF, but the highest in 1.5X. Ozoban-treated foliage chlorophyll a and carotenoids. No significant EDU effects conclusively show that EDU or Ozoban provide adequate consistently protected chloroplast pigment content from ozone displayed no significant antioxidant effects with regard to effects became inconsistent. Because of the relatively low effects were observed early in the study for all variables, foliar nitrogen concentration was determined every other had higher A with increasing ozone compared to controls. At in April 1994 while being exposed to either sub-ambient (CF), In separate experiments, ozone-sensitive loblolly pine (Pinus indicates that both antioxidants show promise in providing injury, however, 2060 ppm Ozoban appeared to be harmful to leaf nitrogen concentration throughout the study. Ozone levels. Net photosynthesis (A), stomatal conductance (g), month beginning in June. Although no consistent antioxidant of seedlings in CF and NF, the results of this study do not open-top chambers. or 300 ppm ethylenediurea (EDU) or 0 ppm, 1030 ppm, or 2060 ppm Ozoban every 14 days. The seedlings were grown in open- protection from ozone injury to loblolly pine seedlings in protection from ozone injury. EDU at 150 ppm and Ozoban at reducing A in younger seedlings. Neither antioxidant seedlings. Seedlings treated with 1030 ppm Ozoban in June sub-ambient ozone levels, 1030 ppm Ozoban showed signs of taeda L.) seedlings were treated with either 0 ppm, 150 ppm the final sampling period in October where foliage treated to that of the past five years) and the abundant top growth top chambers in east Texas for one growing season beginning total carotenoids),were determined every month and total treatment effects were observed, linear regression analysis were observed with total leaf nitrogen concentration until with 150 ppm EDU showed the lowest nitrogen concentration in with 300 ppm EDU displayed higher nitrogen concentration at |
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| Item Description: | "Major subject: Plant Physiology". Vita. |
| Physical Description: | ix, 73 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |