Abstract
The objective of this work was to evaluate gas exchange rates, plant height, yield components, and productivity of upland rice, as affected by type and application time of plant growth regulators. A randomized block design, in a 4x2 factorial arrangement, with four replicates was used. Treatments consisted of three growth regulators (mepiquat chloride, trinexapac-ethyl, and paclobutrazol), besides a control treatment applied at two different phenological stages: early tillering or panicle primordial differentiation. The experiment was performed under sprinkler-irrigated field conditions. Net CO2 assimilation, stomatal conductance, plant transpiration, and water-use efficiency were measured four times in Primavera upland rice cultivar, between booting and milky grain phenophases. Gas exchange rates were neither influenced by growth regulators nor by application time. There was, however, interaction between these factors on the other variables. Application of trinexapac-ethyl at both tillering and differentiation stages reduced plant height and negatively affected yield components and rice productivity. However, paclobutrazol and mepiquat chloride applied at tillering, reduced plant height without affecting rice yield. Mepiquat chloride acted as a growth stimulator when applied at the differentiation stage, and significantly increased plant height, panicle number, and grain yield of upland rice.
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Claims 8
Claim · model-written summary
Growth regulators and application time did not influence rice gas exchange rates.
- Taxon
- upland rice
Oryza sativae1 - Treatment
- growth regulatorse0
- Outcome
- Gas exchange ratese0
- Direction
- neither influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gas exchange rates were neither influenced by growth regulators nor by application time”
e1“Primavera upland rice cultivar”
Claim · model-written summary
Trinexapac-ethyl at tillering and differentiation reduced rice plant height.
- Taxon
- upland riceOryza sativae1
- Treatment
- trinexapac-ethyl at both tillering and differentiation stagese0
- Outcome
- plant heighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of trinexapac-ethyl at both tillering and differentiation stages reduced plant height”
e1“Primavera upland rice cultivar”
Claim · model-written summary
Trinexapac-ethyl at both stages negatively affected rice yield components and productivity.
- Taxon
- upland riceOryza sativae1
- Treatment
- trinexapac-ethyl at both tillering and differentiation stagese0
- Outcome
- yield components and rice productivitye0
- Direction
- negatively affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of trinexapac-ethyl at both tillering and differentiation stages reduced plant height and negatively affected yield components and rice productivity”
e1“Primavera upland rice cultivar”
Claim · model-written summary
Paclobutrazol at tillering reduced rice plant height.
- Taxon
- upland riceOryza sativae1
- Treatment
- paclobutrazole0
- Outcome
- plant heighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“paclobutrazol and mepiquat chloride applied at tillering, reduced plant height without affecting rice yield”
e1“Primavera upland rice cultivar”
Claim · model-written summary
Mepiquat chloride at tillering reduced rice plant height.
- Taxon
- upland riceOryza sativae1
- Treatment
- mepiquat chloride applied at tilleringe0
- Outcome
- plant heighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“paclobutrazol and mepiquat chloride applied at tillering, reduced plant height without affecting rice yield”
e1“Primavera upland rice cultivar”
Claim · model-written summary
Paclobutrazol at tillering did not affect rice yield.
- Taxon
- upland riceOryza sativae1
- Treatment
- paclobutrazole0
- Outcome
- rice yielde0
- Direction
- without affectinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“paclobutrazol and mepiquat chloride applied at tillering, reduced plant height without affecting rice yield”
e1“Primavera upland rice cultivar”
Claim · model-written summary
Mepiquat chloride at tillering did not affect rice yield.
- Taxon
- upland riceOryza sativae1
- Treatment
- mepiquat chloride applied at tilleringe0
- Outcome
- rice yielde0
- Direction
- without affectinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“paclobutrazol and mepiquat chloride applied at tillering, reduced plant height without affecting rice yield”
e1“Primavera upland rice cultivar”
Claim · model-written summary
Mepiquat chloride at differentiation significantly increased rice height, panicle number and grain yield.
- Taxon
- upland riceOryza sativae0
- Treatment
- Mepiquat chloridee0
- Outcome
- plant height, panicle number, and grain yielde0
- Direction
- increasede0
- Qualifier
- at the differentiation stagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mepiquat chloride acted as a growth stimulator when applied at the differentiation stage, and significantly increased plant height, panicle number, and grain yield of upland rice”
The same questions in other papers
trinexapac-ethyl · yield · Oryza sativa (rice)Results differ
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See all 7 papers →trinexapac-ethyl · growth · Oryza sativa (rice)Positive and negative results
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See all 13 papers →mepiquat chloride · growth · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
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mepiquat chloride · yield · Oryza sativa (rice)Results agree
2 papers in the same direction as this paper
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chloride · yield · Oryza sativa (rice)Results agree
3 papers in the same direction as this paper
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8 of 11 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.