Abstract
Abstract The effects of intraspecific competition on the growth, development and resource‐allocation of Panicum repens was studied under greenhouse conditions. Evidence of severe intraspecific competition and adjustments to plant growth as a response to stress caused by competition, was seen from fairly early stages. An eight‐fold difference in initial plant density per pot, did not produce a significant difference in the dry weight accumulation between densities by 16‐weeks. Increase in plant density resulted in a very significant decrease in dry weight accumulation on a per plant basis, as expected. In general, dry weight partitioning into rhizomes and inflorescences increased with time at all densities, with a concomitant decrease in the percent dry weight partitioned into roots and shoots. Under low density conditions more dry weight was partitioned into inflorescences than at higher densities, indicating a shift in resource‐allocation with changing density. However, the expected shift of dry weight partitioning towards rhizome production at the highest densities was not evident. Allocation of resources to rhizomes did not vary with density. Even the lowest density plants which were not subjected to competitive stress, and the plants at the highest density, all allocated about one fifth of their dry weights to rhizomes. Plants under the highest density stress showed a very significant reduction in the number of tillers they produced and tiller dry weights, on both per pot and per plant basis. The study provides several insights into the highly adaptive and competitive nature of the grass weed, which contribute greatly to its success as a species.
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Claims 9
Claim · model-written summary
Severe intraspecific competition affected plant growth from early stages.
- Taxon
- Panicum repens
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Panicum repenst0 - Outcome
- severe intraspecific competition and adjustments to plant growthe0
- Qualifier
- fairly early stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Evidence of severe intraspecific competition and adjustments to plant growth as a response to stress caused by competition, was seen from fairly early stages.”
t0“Panicum repens”
Claim · model-written summary
An eight-fold density difference produced no significant difference in pot dry weight by 16 weeks.
- Taxon
- Panicum repensPanicum repenst0
- Treatment
- initial plant density per pote0
- Outcome
- dry weight accumulation between densitiese0
- Direction
- did not produce a significant differencee0
- Value
- eight‐folde0
- Qualifier
- by 16‐weekse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An eight‐fold difference in initial plant density per pot, did not produce a significant difference in the dry weight accumulation between densities by 16‐weeks.”
t0“Panicum repens”
Claim · model-written summary
Higher density significantly decreased per-plant dry weight accumulation.
- Taxon
- Panicum repensPanicum repenst0
- Treatment
- plant densitye0
- Outcome
- dry weight accumulation on a per plant basise0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase in plant density resulted in a very significant decrease in dry weight accumulation on a per plant basis”
t0“Panicum repens”
Claim · model-written summary
Rhizome and inflorescence dry weight allocation increased over time at all densities.
- Taxon
- Panicum repensPanicum repenst0
- Organ / stage
- rhizomes and inflorescencese0
- Outcome
- dry weight partitioning into rhizomes and inflorescencese0
- Direction
- increasede0
- Qualifier
- at all densitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry weight partitioning into rhizomes and inflorescences increased with time at all densities”
t0“Panicum repens”
Claim · model-written summary
Root and shoot percentage of dry weight allocation decreased over time.
- Taxon
- Panicum repensPanicum repenst0
- Organ / stage
- roots and shootse0
- Outcome
- percent dry weight partitioned into roots and shootse0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with a concomitant decrease in the percent dry weight partitioned into roots and shoots.”
t0“Panicum repens”
Claim · model-written summary
Low-density plants allocated more dry weight to inflorescences than higher-density plants.
- Taxon
- Panicum repensPanicum repenst0
- Treatment
- low density conditionse0
- Outcome
- dry weight was partitioned into inflorescencese0
- Direction
- moree0
- Comparator
- higher densitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under low density conditions more dry weight was partitioned into inflorescences than at higher densities”
t0“Panicum repens”
Claim · model-written summary
Rhizome resource allocation did not vary with density.
- Taxon
- Panicum repensPanicum repenst0
- Organ / stage
- rhizomese0
- Treatment
- densitye0
- Outcome
- Allocation of resources to rhizomese0
- Direction
- did not varye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Allocation of resources to rhizomes did not vary with density.”
t0“Panicum repens”
Claim · model-written summary
Plants at both lowest and highest densities allocated about one fifth of dry weight to rhizomes.
- Taxon
- Panicum repensPanicum repenst0
- Organ / stage
- rhizomese0
- Outcome
- dry weights to rhizomese0
- Value
- one fifthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plants at the highest density, all allocated about one fifth of their dry weights to rhizomes.”
t0“Panicum repens”
Claim · model-written summary
Highest density stress significantly reduced tiller number and tiller dry weights per pot and plant.
- Taxon
- Panicum repensPanicum repenst0
- Treatment
- highest density stresse0
- Outcome
- number of tillers they produced and tiller dry weightse0
- Direction
- reductione0
- Qualifier
- on both per pot and per plant basise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants under the highest density stress showed a very significant reduction in the number of tillers they produced and tiller dry weights, on both per pot and per plant basis.”
t0“Panicum repens”