Abstract
Effects of hydrocarbons, such as methane, ethane, ethylene, propane and propylene, on the root growth of soybean (Glycine max Merr. cv. Enrei) and rice (Oryza sativa L. cv. Nihonbare) seedlings were examined. The results obtained are summarized as follows: 1. When roots of soybean were exposed to 1, 000 ppm of hydrocarbons, ethylene was most effective to inhibit the root growth with promortion of root-hair formation and increase of stem-diameter. The activity was decreased in the order of propyelene, propane, ethan and methane. Inhibitory activity of propylene on root growth was one hundredth of ethylene, and 50% inhibition of soybean root growth was obtained with 1 ppm ethylene. 2. In rice seedling, seminal root growth was stimulated with both of 1, 000 ppm ethylene and propylene, whereas the growth of first crown roots was inhibited greatly as well as the soybean roots. 3. Effect of ethylene on the growth of seminal root of rice seedling was examined in the range of concentrations from 0.1 to 10, 000 ppm. The most effectivc promotion was obtained at 0.1 to 1 ppm. On the other hand, the growth of first crown roots was promoted with 0.1 ppm ethylene, whereas concentrations higher than 10 ppm inhibited the growth greatly. 4. Effect of ethylene on rooting of rice seedlings was examined and promotion of new roots elongation was observed at 0.1 ppm of ethylene, whereas increase in number of new roots was observed at 10 ppm of ethylene. These results strongly suggest the view that ethylene in the rhizosphere may have direct effect on the growth and development of roots.
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Claims 12
Claim · model-written summary
At 1,000 ppm, ethylene most strongly inhibited soybean root growth.
- Taxon
- soybean
Glycine maxe0 - Treatment
- ethylenee0
- Outcome
- root growthe0
- Direction
- inhibite0
- Qualifier
- 1, 000 ppme0
- Comparator
- hydrocarbonse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When roots of soybean were exposed to 1, 000 ppm of hydrocarbons, ethylene was most effective to inhibit the root growth”
Claim · model-written summary
Ethylene promoted soybean root hair formation and stem diameter.
Not reportedTaxonComparator
Verbatim
e0“ethylene was most effective to inhibit the root growth with promortion of root-hair formation and increase of stem-diameter”
Claim · model-written summary
The inhibitory activity ranked propylene, propane, ethane and methane after ethylene.
Not reportedTaxon
Verbatim
e0“The activity was decreased in the order of propyelene, propane, ethan and methane.”
Claim · model-written summary
Propylene inhibited soybean root growth at one hundredth the activity of ethylene.
- Treatment
- propylenee0
- Outcome
- root growthe0
- Direction
- Inhibitorye0
- Value
- one hundredthe0
- Comparator
- ethylenee0
Not reportedTaxon
Verbatim
e0“Inhibitory activity of propylene on root growth was one hundredth of ethylene”
Claim · model-written summary
One ppm ethylene inhibited soybean root growth by 50%.
- Taxon
- soybeanGlycine maxe0
- Treatment
- 1 ppm ethylenee0
- Outcome
- soybean root growthe0
- Direction
- inhibitione0
- Value
- 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“50% inhibition of soybean root growth was obtained with 1 ppm ethylene”
Claim · model-written summary
Ethylene and propylene at 1,000 ppm stimulated rice seminal root growth.
- Taxon
- rice
Oryza sativae0 - Treatment
- 1, 000 ppm ethylene and propylenee0
- Outcome
- seminal root growthe0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice seedling, seminal root growth was stimulated with both of 1, 000 ppm ethylene and propylene”
Claim · model-written summary
Ethylene and propylene inhibited first crown root growth in rice.
Not reportedTaxonTreatmentComparator
Verbatim
e0“whereas the growth of first crown roots was inhibited greatly as well as the soybean roots”
Claim · model-written summary
Rice seminal root promotion was greatest at 0.1 to 1 ppm ethylene.
Not reportedTaxonComparator
Verbatim
e0“The most effectivc promotion was obtained at 0.1 to 1 ppm.”
Claim · model-written summary
At 0.1 ppm ethylene, rice first crown root growth was promoted.
Not reportedTaxonComparator
Verbatim
e0“the growth of first crown roots was promoted with 0.1 ppm ethylene”
Claim · model-written summary
Above 10 ppm ethylene, rice first crown root growth was strongly inhibited.
Not reportedTaxonComparator
Verbatim
e0“concentrations higher than 10 ppm inhibited the growth greatly”
Claim · model-written summary
At 0.1 ppm ethylene, new rice roots elongated more.
Not reportedTaxonComparator
Verbatim
e0“promotion of new roots elongation was observed at 0.1 ppm of ethylene”
Claim · model-written summary
At 10 ppm ethylene, rice produced more new roots.
Not reportedTaxonComparator
Verbatim
e0“increase in number of new roots was observed at 10 ppm of ethylene”
The same questions in other papers
ethene · growth · Glycine max (soybean)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 papers →ethene · growth · Oryza sativa (rice)Positive and negative results
18 papers in the same direction as this paper · 4 in the opposite direction
- negative
- no effect
- negative
19 papers more in this group
See all 23 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.