Abstract
Pollen of the ozone-sensitive tobacco variety Bel W-3 undergoes a reduction in germination rate and tube elongation when exposed to ozone. As little as 0.1 part of ozone per million for a 5.5-hour exposure period is sufficient to cause a 40 to 50 percent reduction in germination and a 50 percent reduction in pollen-tube elongation. Ozone causes these effects to approximately the same degree whether the pollen is exposed to ozone in vitro or agar disks, or in vivo when the intact plant is exposed. Exposure to ozone at a concentration of 1.0 part per million for more than 3 hours in vitro completely prevents germination of Bel W-3 pollen.
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Claims 4
Claim · model-written summary
As little as 0.1 ppm ozone for 5.5 hours reduced pollen germination by 40 to 50 percent in tobacco Bel W-3.
- Taxon
- tobacco
Nicotiana tabacume1 - Material
- Bel W-3e1
- Organ / stage
- Pollene1
- Treatment
- 0.1 part of ozone per million for a 5.5-hour exposure periode2
- Outcome
- germinatione2
- Direction
- reductione2
- Value
- 40 to 50 percente2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pollen of the ozone-sensitive tobacco variety Bel W-3 undergoes a reduction in germination rate and tube elongation when exposed to ozone”
e2“As little as 0.1 part of ozone per million for a 5.5-hour exposure period is sufficient to cause a 40 to 50 percent reduction in germination and a 50 percent reduction in pollen-tube elongation”
Claim · model-written summary
As little as 0.1 ppm ozone for 5.5 hours reduced pollen-tube elongation by 50 percent in tobacco Bel W-3.
- Taxon
- tobaccoNicotiana tabacume1
- Material
- Bel W-3e1
- Organ / stage
- Pollene1
- Treatment
- 0.1 part of ozone per million for a 5.5-hour exposure periode2
- Outcome
- pollen-tube elongatione2
- Direction
- reductione2
- Value
- 50 percente2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pollen of the ozone-sensitive tobacco variety Bel W-3 undergoes a reduction in germination rate and tube elongation when exposed to ozone”
e2“As little as 0.1 part of ozone per million for a 5.5-hour exposure period is sufficient to cause a 40 to 50 percent reduction in germination and a 50 percent reduction in pollen-tube elongation”
Claim · model-written summary
Ozone caused approximately the same degree of pollen effects in vitro (agar disks) and in vivo in intact plants.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- exposed to ozonee3
- Outcome
- these effectse3
- Direction
- approximately the same degreee3
- Comparator
- in vitro or agar diskse3
- Setting
- in vivoe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pollen of the ozone-sensitive tobacco variety Bel W-3 undergoes a reduction in germination rate and tube elongation when exposed to ozone”
e3“Ozone causes these effects to approximately the same degree whether the pollen is exposed to ozone in vitro or agar disks, or in vivo when the intact plant is exposed”
Claim · model-written summary
Exposure to 1.0 ppm ozone for more than 3 hours in vitro completely prevented germination of tobacco Bel W-3 pollen.
- Taxon
- tobaccoNicotiana tabacume1
- Material
- Bel W-3 pollene4
- Organ / stage
- pollene4
- Treatment
- Exposure to ozone at a concentration of 1.0 part per million for more than 3 hourse4
- Outcome
- germinatione4
- Direction
- completely preventse4
- Setting
- in vitroe4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Pollen of the ozone-sensitive tobacco variety Bel W-3 undergoes a reduction in germination rate and tube elongation when exposed to ozone”
e4“Exposure to ozone at a concentration of 1.0 part per million for more than 3 hours in vitro completely prevents germination of Bel W-3 pollen”
The same questions in other papers
ozone · growth · Nicotiana tabacum (tobacco)Results agree
7 papers in the same direction as this paper
- negative
- negative
- negative
4 papers more in this group
See all 8 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.