Abstract
Abstract The structural and functional parameters of juvenile plants Heracleum mantegazzianum Sommier & Levier plants were studied under laboratory conditions. The illumination intensity of plants was modeled based on observations of the light regime in the ground layer of natural populations of the species. Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth, the contribution of the main phytomass to the leaves and the high rate of net photosynthesis supported a relative growth rate of 80 mg/g dry mass day. The plants adapted to decreased illumination to 20 µmol/(m2 s) PAR (summer period modeling) by lengthening petioles, reducing leaf density, and increasing the size of the light-harvesting complex of leaf pigments. Limitation of light resources caused a decrease in the relative growth rate to 14 mg/(g dry mass day). Restoring light levels to 250 µmol/(m2 s) PAR (autumn period modeling) activated growth and contributed to the storage of plastic substances, mainly in the underground organs of plants. Structural and functional changes in H. mantegazzianum juveniles that were revealed during the experiment indicate the high efficiency of light resource use in spring and autumn, as well as a significant reduction in metabolic activity during summer shading. This strategy promotes efficient growth during the long growing season and maintenance of the number of H. mantegazzianum juvenile plants under conditions of intraspecific competition.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
At 250 µmol/(m2 s) PAR, juvenile growth rate was 80 mg/g dry mass day.
- Taxon
- H. mantegazzianum
Heracleum mantegazzianume0 - Organ / stage
- juvenilee0
- Treatment
- 250 µmol/(m2 s) PARe0
- Outcome
- relative growth ratee0
- Value
- 80 mg/g dry mass daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth, the contribution of the main phytomass to the leaves and the high rate of net photosynthesis supported a relative growth rate of 80 mg/g dry mass day”
e1“Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth”
Claim · model-written summary
At spring light levels, most biomass was allocated to leaves.
- Taxon
- H. mantegazzianumHeracleum mantegazzianume1
- Organ / stage
- leavese0
- Outcome
- contribution of the main phytomass to the leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“during the initial stage of juvenile growth, the contribution of the main phytomass to the leaves and the high rate of net photosynthesis supported a relative growth rate of 80 mg/g dry mass day”
e1“Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth”
Claim · model-written summary
At spring light levels, net photosynthesis was high.
- Taxon
- H. mantegazzianumHeracleum mantegazzianume1
- Outcome
- net photosynthesise0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the high rate of net photosynthesis supported a relative growth rate of 80 mg/g dry mass day”
e1“Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth”
Claim · model-written summary
Reduced illumination lengthened petioles.
- Taxon
- H. mantegazzianumHeracleum mantegazzianume1
- Treatment
- decreased illumination to 20 µmol/(m2 s) PARe0
- Outcome
- petiolese0
- Direction
- lengtheninge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plants adapted to decreased illumination to 20 µmol/(m2 s) PAR (summer period modeling) by lengthening petioles, reducing leaf density, and increasing the size of the light-harvesting complex of leaf pigments”
e1“Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth”
Claim · model-written summary
Reduced illumination lowered leaf density.
- Taxon
- H. mantegazzianumHeracleum mantegazzianume1
- Treatment
- decreased illumination to 20 µmol/(m2 s) PARe0
- Outcome
- leaf densitye0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plants adapted to decreased illumination to 20 µmol/(m2 s) PAR (summer period modeling) by lengthening petioles, reducing leaf density, and increasing the size of the light-harvesting complex of leaf pigments”
e1“Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth”
Claim · model-written summary
Reduced illumination enlarged the leaf pigment light-harvesting complex.
- Taxon
- H. mantegazzianumHeracleum mantegazzianume1
- Treatment
- decreased illumination to 20 µmol/(m2 s) PARe0
- Outcome
- size of the light-harvesting complex of leaf pigmentse0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plants adapted to decreased illumination to 20 µmol/(m2 s) PAR (summer period modeling) by lengthening petioles, reducing leaf density, and increasing the size of the light-harvesting complex of leaf pigments”
e1“Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth”
Claim · model-written summary
Light limitation reduced relative growth rate to 14 mg/(g dry mass day).
- Taxon
- H. mantegazzianumHeracleum mantegazzianume1
- Treatment
- Limitation of light resourcese0
- Outcome
- relative growth ratee0
- Direction
- decreasee0
- Value
- 14 mg/(g dry mass day)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Limitation of light resources caused a decrease in the relative growth rate to 14 mg/(g dry mass day)”
e1“Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth”
Claim · model-written summary
Restored light activated growth.
- Taxon
- H. mantegazzianumHeracleum mantegazzianume1
- Treatment
- Restoring light levels to 250 µmol/(m2 s) PARe0
- Outcome
- growthe0
- Direction
- activatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Restoring light levels to 250 µmol/(m2 s) PAR (autumn period modeling) activated growth and contributed to the storage of plastic substances, mainly in the underground organs of plants”
e1“Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth”
Claim · model-written summary
Restored light promoted storage of plastic substances in underground organs.
- Taxon
- H. mantegazzianumHeracleum mantegazzianume1
- Organ / stage
- underground organse0
- Treatment
- Restoring light levels to 250 µmol/(m2 s) PARe0
- Outcome
- storage of plastic substancese0
- Direction
- contributede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Restoring light levels to 250 µmol/(m2 s) PAR (autumn period modeling) activated growth and contributed to the storage of plastic substances, mainly in the underground organs of plants”
e1“Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth”
Claim · model-written summary
Authors interpret seasonal structural and functional changes as efficient light use in spring and autumn and lower metabolic activity in summer shade.
- Taxon
- H. mantegazzianumHeracleum mantegazzianume1
- Outcome
- efficiency of light resource usee0
- Qualifier
- spring and autumne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high efficiency of light resource use in spring and autumn, as well as a significant reduction in metabolic activity during summer shading”
e1“Growing H. mantegazzianum at an illumination of 250 µmol/(m2 s) PAR (spring period modeling) showed that during the initial stage of juvenile growth”