Abstract
Abstract INTRODUCTION Sublethal doses of herbicides can enhance plant growth and stimulate other process, an effect known as hormesis. The magnitude of hormesis is dependent on the plant species, the herbicide and its dose, plant development stage and environmental parameters. Glyphosate hormesis is well established, but relatively little is known of the mechanism of this phenomenon. The objective of this study was to determine if low doses of glyphosate that cause growth stimulation in sugarcane and eucalyptus concomitantly stimulate CO 2 assimilation. RESULTS Shoot dry weight in both species increased at both 40 and 60 days after application of 6.2 to 20.2 g a.e. ha −1 glyphosate. The level of enhanced shoot dry weight was 11 to 37%, depending on the time after treatment and the species. Concomitantly, CO 2 assimilation, stomatal conductance and transpiration were increased by glyphosate doses similar to those that caused growth increases. CONCLUSION Glyphosate applied at low doses increased the dry weight of sugarcane and eucalyptus plants in all experiments. This hormetic effect was related to low dose effects on CO 2 assimilation rate, stomatal conductance and transpiration rate, indicating that low glyphosate doses enhance photosynthesis of plants. © 2017 Society of Chemical Industry
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Claims 8
Claim · model-written summary
Glyphosate increased shoot dry weight in sugarcane.
Not reportedComparator
Verbatim
e0“Shoot dry weight in both species increased at both 40 and 60 days after application of 6.2 to 20.2 g a.e. ha −1 glyphosate”
t0“sugarcane and eucalyptus”
Claim · model-written summary
Glyphosate increased CO 2 assimilation in sugarcane.
Not reportedComparator
Verbatim
e0“CO 2 assimilation, stomatal conductance and transpiration were increased by glyphosate doses similar to those that caused growth increases”
t0“sugarcane and eucalyptus”
Claim · model-written summary
Glyphosate increased stomatal conductance in sugarcane.
Not reportedComparator
Verbatim
e0“CO 2 assimilation, stomatal conductance and transpiration were increased by glyphosate doses similar to those that caused growth increases”
t0“sugarcane and eucalyptus”
Claim · model-written summary
Glyphosate increased transpiration in sugarcane.
Not reportedComparator
Verbatim
e0“CO 2 assimilation, stomatal conductance and transpiration were increased by glyphosate doses similar to those that caused growth increases”
t0“sugarcane and eucalyptus”
Claim · model-written summary
Glyphosate increased shoot dry weight in eucalyptus.
- Taxon
- eucalyptus
.jpg?width=60)
Eucalyptust0 - Treatment
- glyphosatee0
- Outcome
- Shoot dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Shoot dry weight in both species increased at both 40 and 60 days after application of 6.2 to 20.2 g a.e. ha −1 glyphosate”
t0“sugarcane and eucalyptus”
Claim · model-written summary
Glyphosate increased CO 2 assimilation in eucalyptus.
- Taxon
- eucalyptusEucalyptust0
- Treatment
- glyphosatee0
- Outcome
- CO 2 assimilatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 assimilation, stomatal conductance and transpiration were increased by glyphosate doses similar to those that caused growth increases”
t0“sugarcane and eucalyptus”
Claim · model-written summary
Glyphosate increased stomatal conductance in eucalyptus.
- Taxon
- eucalyptusEucalyptust0
- Treatment
- glyphosatee0
- Outcome
- stomatal conductancee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 assimilation, stomatal conductance and transpiration were increased by glyphosate doses similar to those that caused growth increases”
t0“sugarcane and eucalyptus”
Claim · model-written summary
Glyphosate increased transpiration in eucalyptus.
- Taxon
- eucalyptusEucalyptust0
- Treatment
- glyphosatee0
- Outcome
- transpiratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 assimilation, stomatal conductance and transpiration were increased by glyphosate doses similar to those that caused growth increases”
t0“sugarcane and eucalyptus”
The same questions in other papers
glyphosate · growth · EucalyptusResults differ
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
glyphosate · growth · Saccharum officinarum (sugarcane)Results differ
2 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- negative
2 papers more in this group
See all 6 papers →glyphosate · physiology: photosynthesis · Saccharum officinarum (sugarcane)Positive and negative results
1 in the opposite direction
- negative
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.