Abstract
The production of mini shallot bulbs from true seed offers potential advantages for efficient propagation and high-quality seed systems. This study evaluated the responses of shallot growth and bulb miniaturization to planting density and paclobutrazol root-dipping under greenhouse conditions. The experiment was arranged in a split-plot design with three planting densities (100, 200, and 300 plants m-²) as main plots and four paclobutrazol concentrations (0, 150, 300, and 450 mg L-¹) as subplots. Growth traits, yield components, biochemical attributes, and geometric characteristics were analysed using ANOVA, regression, and correlation analyses. Paclobutrazol temporarily reduced plant height and leaf number during early growth but did not significantly affect bulb size, bulb weight, or pigment composition at harvest. In contrast, planting density markedly influenced plant morphology and yield distribution. Increasing density significantly decreased bulb diameter, fresh weight, and biomass per plant, while increasing the proportion of mini bulbs and single-bulb formations. Leaf pigment stability across treatments indicated no evidence of physiological stress associated with either factor. Regression analysis further showed that planting density exhibited stronger predictive relationships with yield parameters than paclobutrazol concentration. Overall, the findings indicate that bulb miniaturization in true-seed shallot is primarily associated with planting density rather than paclobutrazol application, highlighting high-density planting as a practical approach for mini-bulb production systems.
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Claims 6
Claim · model-written summary
Paclobutrazol temporarily reduced shallot plant height and leaf number during early growth.
- Taxon
- shallot
Allium cepa var. aggregatume0 - Treatment
- paclobutrazol root-dippinge0
- Outcome
- plant height and leaf numbere1
- Direction
- reducede1
- Qualifier
- temporarilye1
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study evaluated the responses of shallot growth and bulb miniaturization to planting density and paclobutrazol root-dipping under greenhouse conditions”
e1“Paclobutrazol temporarily reduced plant height and leaf number during early growth”
Claim · model-written summary
Paclobutrazol did not significantly affect bulb size, bulb weight or pigment composition at harvest.
- Taxon
- shallotAllium cepa var. aggregatume0
- Treatment
- paclobutrazol root-dippinge0
- Outcome
- bulb size, bulb weight, or pigment compositione2
- Direction
- no_changeinferrede2
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study evaluated the responses of shallot growth and bulb miniaturization to planting density and paclobutrazol root-dipping under greenhouse conditions”
e2“did not significantly affect bulb size, bulb weight, or pigment composition at harvest”
Claim · model-written summary
Increasing planting density significantly decreased bulb diameter, fresh weight and biomass per plant.
- Taxon
- shallotAllium cepa var. aggregatume0
- Treatment
- Increasing densitye3
- Outcome
- bulb diameter, fresh weight, and biomass per plante3
- Direction
- decreasede3
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study evaluated the responses of shallot growth and bulb miniaturization to planting density and paclobutrazol root-dipping under greenhouse conditions”
e3“Increasing density significantly decreased bulb diameter, fresh weight, and biomass per plant”
Claim · model-written summary
Higher planting density increased the proportion of mini bulbs and single-bulb formations.
- Taxon
- shallotAllium cepa var. aggregatume0
- Treatment
- planting densitye0
- Outcome
- proportion of mini bulbs and single-bulb formationse4
- Direction
- increasinge4
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study evaluated the responses of shallot growth and bulb miniaturization to planting density and paclobutrazol root-dipping under greenhouse conditions”
e4“increasing the proportion of mini bulbs and single-bulb formations”
Claim · model-written summary
Leaf pigment stability indicated no evidence of physiological stress in shallot.
- Taxon
- shallotAllium cepa var. aggregatume0
- Outcome
- physiological stresse5
- Qualifier
- no evidencee5
- Setting
- greenhouse conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study evaluated the responses of shallot growth and bulb miniaturization to planting density and paclobutrazol root-dipping under greenhouse conditions”
e5“Leaf pigment stability across treatments indicated no evidence of physiological stress associated with either factor”
Claim · model-written summary
Planting density had stronger predictive relationships with yield parameters than paclobutrazol concentration.
- Taxon
- shallotAllium cepa var. aggregatume0
- Treatment
- planting densitye6
- Outcome
- predictive relationships with yield parameterse6
- Direction
- strongere6
- Comparator
- paclobutrazol concentratione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study evaluated the responses of shallot growth and bulb miniaturization to planting density and paclobutrazol root-dipping under greenhouse conditions”
e6“planting density exhibited stronger predictive relationships with yield parameters than paclobutrazol concentration”
The same questions in other papers
paclobutrazol · physiology: pigments · Allium cepa (onion)Results differ
1 in the opposite direction
- positive
application · physiology: pigments · Allium cepa (onion)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
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.