Abstract
The distribution and partitioning of dry matter and photoassimilate of Lolium perenne was investigated under two light regimes providing photosynthetically active radiation of 350 /imo m 2 s~1 (low light treatment) or 1000 //mol m 2 s~1 (high light treatment). Plants were grown at specific growth conditions in either soil or sand microcosm units to follow the subsequent release of carbon into the rhizosphere and its consequent incorporation into the microbial biomass (soil system) or recovery as exudates (sand system). The distribution of recent assimilate between the plant and root released carbon pools was determined using 14C02 pulse-chase methodology at both light treatments and for both sand- and soil-grown seedlings. A significant (P<0.05) increase in partitioning of Relabel below-ground occurred for both soil- and sandgrown seedlings at the increased light treatment. Incorporation of recent assimilate into the microbial biomass, however, was unaltered by light treatment. Total plant biomass of L. perenne seedlings grown in the sand microcosm unit was unaffected by light treatment, but differences in partitioning of biomass did occur resulting in an increased root-to-shoot ratio under high light. Soil-grown L. perenne seedlings showed a large (81%) and significant (P< 0.001) increase in shoot biomass under high light with a consequent decrease in root-to-shoot ratio. Specific leaf area was altered in the soil grown plants only, where it decreased under high light. Total organic carbon (TOC) content of the recovered exudate material was measured throughout the 14 d experimental period and during the 14C-chase period. Comparison of plant C budgets using these two measurements is discussed.
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Claims 6
Claim · model-written summary
Higher light significantly increased below ground partitioning of recent carbon in soil and sand grown seedlings.
- Taxon
- Lolium perenne
Lolium perennee0 - Treatment
- increased light treatmente1
- Outcome
- partitioning of Relabel below-grounde1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry matter and photoassimilate of Lolium perenne”
e1“A significant (P<0.05) increase in partitioning of Relabel below-ground occurred for both soil- and sandgrown seedlings at the increased light treatment.”
Claim · model-written summary
Light treatment did not alter recent assimilate incorporation into microbial biomass.
- Taxon
- Lolium perenneLolium perennee0
- Treatment
- light treatmente1
- Outcome
- Incorporation of recent assimilate into the microbial biomasse1
- Direction
- unalterede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry matter and photoassimilate of Lolium perenne”
e1“Incorporation of recent assimilate into the microbial biomass, however, was unaltered by light treatment.”
Claim · model-written summary
Total biomass of sand grown Lolium seedlings was unaffected by light treatment.
- Taxon
- L. perenneLolium perennee0
- Treatment
- light treatmente0
- Outcome
- Total plant biomasse0
- Direction
- unaffectede0
- Setting
- sand microcosm unite0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total plant biomass of L. perenne seedlings grown in the sand microcosm unit was unaffected by light treatment”
Claim · model-written summary
High light increased root to shoot ratio in sand grown Lolium.
- Taxon
- L. perenneLolium perennee0
- Treatment
- high lighte0
- Outcome
- root-to-shoot ratioe0
- Direction
- increasede0
- Setting
- sand microcosm unite0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total plant biomass of L. perenne seedlings grown in the sand microcosm unit was unaffected by light treatment, but differences in partitioning of biomass did occur resulting in an increased root-to-shoot ratio under high light.”
Claim · model-written summary
High light significantly increased shoot biomass of soil grown Lolium by 81%.
- Taxon
- L. perenneLolium perennee0
- Treatment
- high lighte0
- Outcome
- shoot biomasse0
- Direction
- increasee0
- Value
- 81%e0
- Setting
- Soil-growne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil-grown L. perenne seedlings showed a large (81%) and significant (P< 0.001) increase in shoot biomass under high light”
Claim · model-written summary
High light decreased root to shoot ratio in soil grown Lolium.
- Taxon
- L. perenneLolium perennee0
- Treatment
- high lighte0
- Outcome
- root-to-shoot ratioe0
- Direction
- decreasee0
- Setting
- Soil-growne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil-grown L. perenne seedlings showed a large (81%) and significant (P< 0.001) increase in shoot biomass under high light with a consequent decrease in root-to-shoot ratio.”
The same questions in other papers
light · growth · Lolium perenne (perennial ryegrass)Positive and negative results
6 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- no effect
- negative
8 papers more in this group
See all 12 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.