Abstract
Abstract Plasticity in growth, reproductive energy allocation (RA), and reproductive output were investigated in Helianthus annuus L. cultivar. Russia (Compositae) grown under varying densities and soil nitrogen levels. The role and behaviour of pollinators in seed production was also examined. Exceedingly marked plastic responses were detected in individual biomass, the patterns of resource allocation to total reproductive structures (RA) and also to propagules, fecundity, reproductive outputs, and propagule size and weight under changing densities and soil nitrogen levels. Plants cultivated at higher densities exhibited proportionately lower individual biomass, lower RA, lower fecundity, lower seed output, and smaller seed size in response to increasing density and decreasing soil nitrogen levels. However, differences due to different N‐levels were not as great as those to changing density. One of the most significant findings was that seed production under limited resource availability, i.e., lack of ample solar radiation and soil nutrients, due to strong interference at higher density plots, is exceedingly costlty , This was most clearly demonstrated by a very sharp increase in relative energy partitioning to a single propagule in response to the increased density and decreasing nitrogen levels, the relative energy cost to a single achcne (R A ) increasing from one to twenty‐fourfold. Reproduction was also affected by pollinator‐limitations, and seed size showed a marked position effect.
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Claims 6
Claim · model-written summary
Biomass and reproductive allocation, fecundity, output, and propagule size and weight varied with density and nitrogen.
- Taxon
- Helianthus annuus L.
Helianthus annuust0 - Outcome
- individual biomass, the patterns of resource allocation to total reproductive structures (RA) and also to propagulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exceedingly marked plastic responses were detected in individual biomass, the patterns of resource allocation to total reproductive structures (RA) and also to propagules, fecundity, reproductive outputs, and propagule size and weight under changing densities and soil nitrogen levels”
t0“Helianthus annuus L.”
Claim · model-written summary
Higher density and lower nitrogen reduced individual biomass, reproductive allocation, fecundity, seed output, and seed size.
- Taxon
- Helianthus annuus L.Helianthus annuust0
- Treatment
- increasing density and decreasing soil nitrogen levelse0
- Outcome
- individual biomass, lower RA, lower fecunditye0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants cultivated at higher densities exhibited proportionately lower individual biomass, lower RA, lower fecundity, lower seed output, and smaller seed size in response to increasing density and decreasing soil nitrogen levels”
t0“Helianthus annuus L.”
Claim · model-written summary
Nitrogen level effects were smaller than density effects.
- Taxon
- Helianthus annuus L.Helianthus annuust0
- Outcome
- differences due to different N‐levelse0
- Direction
- not as greate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“differences due to different N‐levels were not as great as those to changing density”
t0“Helianthus annuus L.”
Claim · model-written summary
The relative energy cost of one achene rose one to twenty-fourfold with greater density and lower nitrogen.
- Taxon
- Helianthus annuus L.Helianthus annuust0
- Treatment
- increased density and decreasing nitrogen levelse0
- Outcome
- relative energy cost to a single achcnee0
- Direction
- increasinge0
- Value
- one to twenty‐fourfolde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a very sharp increase in relative energy partitioning to a single propagule in response to the increased density and decreasing nitrogen levels, the relative energy cost to a single achcne (R A ) increasing from one to twenty‐fourfold”
t0“Helianthus annuus L.”
Claim · model-written summary
Pollinator limitation affected reproduction.
- Taxon
- Helianthus annuus L.Helianthus annuust0
- Interactor
- pollinatore0pollinator
- Outcome
- Reproductione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reproduction was also affected by pollinator‐limitations”
t0“Helianthus annuus L.”
Claim · model-written summary
Seed size showed a marked position effect.
- Taxon
- Helianthus annuus L.Helianthus annuust0
- Organ / stage
- seede0
- Outcome
- seed sizee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed size showed a marked position effect”
t0“Helianthus annuus L.”
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