Abstract
A field study was performed to evaluate the influence of varied levels of paclobutrazol (PBZ) (0, 100, 200, 400 and 600 mg L-1) applied at different stages of rice plant growth (before panicle initiation, at Pl and after Pl) on the growth responses, lodging resistance and yield of Malaysian rice variety MR219. The results showed that plant height, culm length and flag leaf area decreased steadily with increased concentrations of PBZ application. However, bending resistance, chlorophyll content, number of total panicles, spikelets per panicle, percentage of filled grains, fresh weight of grain and total yield increased when higher concentration of PBZ was applied. The optimum concentration of PBZ for better traits in rice plant was found to be 400 mg L-1. The maximum height reduction was recorded when PBZ was applied before panicle initiation. Bending resistance was greater when PBZ was applied before and during panicle initiation compared with application after panicle initiation. PBZ resulted in an increase in the total number of panicles in 1 m2 regardless of application time. The total chlorophyll content per flag leaf area improved with increase in PBZ concentration, resulting in greener leaves. The yield components were better when PBZ was applied before panicle initiation than that during and after panicle initiation. Thus, 400 mg L-1 PBZ application before panicle initiation appears to be a promising means of controlling the balance between vegetative and generative development. This study has clearly shown that application of PBZ can contribute to yield increase directly as well as indirectly by reducing the event of lodging.
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Claims 9
Claim · model-written summary
Greater PBZ concentration decreased rice height, culm length and flag leaf area.
- Taxon
- rice
Oryza sativat0 - Treatment
- increased concentrations of PBZ applicatione0
- Outcome
- plant height, culm length and flag leaf areae0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant height, culm length and flag leaf area decreased steadily with increased concentrations of PBZ application”
t0“Rice”
Claim · model-written summary
Higher PBZ increased bending resistance, chlorophyll, panicles, spikelets, filled grains, grain weight and yield.
- Taxon
- RiceOryza sativat0
- Treatment
- higher concentration of PBZe0
- Outcome
- bending resistance, chlorophyll content, number of total panicles, spikelets per panicle, percentage of filled grains, fresh weight of grain and total yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bending resistance, chlorophyll content, number of total panicles, spikelets per panicle, percentage of filled grains, fresh weight of grain and total yield increased when higher concentration of PBZ was applied”
t0“Rice”
Claim · model-written summary
The optimum PBZ concentration for rice traits was 400 mg L-1.
- Taxon
- riceOryza sativae0
- Treatment
- PBZe0
- Outcome
- better traitse0
- Value
- 400 mg L-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimum concentration of PBZ for better traits in rice plant was found to be 400 mg L-1”
Claim · model-written summary
PBZ before panicle initiation yielded maximum height reduction.
- Taxon
- RiceOryza sativat0
- Treatment
- PBZ was applied before panicle initiatione0
- Outcome
- height reductione0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum height reduction was recorded when PBZ was applied before panicle initiation”
t0“Rice”
Claim · model-written summary
PBZ before or during panicle initiation gave greater bending resistance than later application.
- Taxon
- RiceOryza sativat0
- Treatment
- PBZ was applied before and during panicle initiatione0
- Outcome
- Bending resistancee0
- Direction
- greatere0
- Comparator
- application after panicle initiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bending resistance was greater when PBZ was applied before and during panicle initiation compared with application after panicle initiation”
t0“Rice”
Claim · model-written summary
PBZ increased panicle number regardless of application time.
- Taxon
- RiceOryza sativat0
- Treatment
- PBZe0
- Outcome
- total number of panicles in 1 m2e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PBZ resulted in an increase in the total number of panicles in 1 m2 regardless of application time”
t0“Rice”
Claim · model-written summary
Increasing PBZ concentration improved flag leaf chlorophyll.
- Taxon
- RiceOryza sativat0
- Treatment
- increase in PBZ concentratione0
- Outcome
- total chlorophyll content per flag leaf areae0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total chlorophyll content per flag leaf area improved with increase in PBZ concentration, resulting in greener leaves”
t0“Rice”
Claim · model-written summary
PBZ before panicle initiation produced better yield components than later timing.
- Taxon
- RiceOryza sativat0
- Treatment
- PBZ was applied before panicle initiatione0
- Outcome
- yield componentse0
- Direction
- bettere0
- Comparator
- during and after panicle initiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield components were better when PBZ was applied before panicle initiation than that during and after panicle initiation”
t0“Rice”
Claim · model-written summary
Authors recommend 400 mg L-1 PBZ before panicle initiation to balance vegetative and generative development.
- Taxon
- RiceOryza sativat0
- Treatment
- 400 mg L-1 PBZ application before panicle initiatione0
- Outcome
- controlling the balance between vegetative and generative developmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“400 mg L-1 PBZ application before panicle initiation appears to be a promising means of controlling the balance between vegetative and generative development”
t0“Rice”
The same questions in other papers
paclobutrazol · physiology: pigments · Oryza sativa (rice)Results differ
6 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
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See all 9 papers →paclobutrazol · disease · Oryza sativa (rice)Results differ
7 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
6 papers more in this group
See all 10 papers →paclobutrazol · yield · Oryza sativa (rice)Results differ
22 papers in the same direction as this paper · 5 in the opposite direction
- negative
- positive
- positive
24 papers more in this group
See all 28 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.