Abstract
The rate of export and longitudinal movement of 14C-labelled assimilates in the phloem was found to be greater in Sorghum sudanense than in Lolium temulentum. Sucrose was the predominant metabolite translocated from the leaf in both species in both low and high light conditions. The effect of irradiance on the rate of formation and nature of the products of photosynthesis was examined using 14CO2 pulse-chase techniques and the differences in the primary metabolites closely followed those expected for a C3 and a C4 species. Reduction in irradiance reduced the rate of incorporation of 14C into sucrose, especially in Sorghum, and led to the accumulation of amino acids in both species. Although species differences in export of 14C-labelled assimilate were not apparently related to the rate of 14C incorporation into sucrose, this could account for the delay in export of 14C-labelled assimilates associated with reduced irradiance. There was a rapid initial labelling of starch and the proportion of *14C incorporated as starch was enhanced at high irradiance, particularly in Sorghum. Overall, the results support the view that there is a greater partitioning of assimilate into storage (starch) at high irradiance relative to assimilate moving into the phloem and that irradiance (in the range 20-96 W m-2) did not directly influence vein loading.
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Claims 10
Claim · model-written summary
Export and longitudinal movement of labelled assimilates were greater in Sorghum than Lolium.
- Taxon
- Sorghum sudanense
Sorghum ×drummondiie0 - Outcome
- rate of export and longitudinal movement of 14C-labelled assimilatese0
- Direction
- greatere0
- Comparator
- Lolium temulentume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of export and longitudinal movement of 14C-labelled assimilates in the phloem was found to be greater in Sorghum sudanense than in Lolium temulentum”
Claim · model-written summary
Sucrose predominated among metabolites translocated from both species in low and high light.
- Outcome
- Sucrose was the predominant metabolite translocated from the leafe0
- Qualifier
- both low and high light conditionse0
Not reportedTaxon
Verbatim
e0“Sucrose was the predominant metabolite translocated from the leaf in both species in both low and high light conditions”
Claim · model-written summary
Primary metabolite differences followed expectations for C3 and C4 species.
Not reportedTaxon
Verbatim
e0“the differences in the primary metabolites closely followed those expected for a C3 and a C4 species”
Claim · model-written summary
Reduced irradiance reduced labelled carbon incorporation into sucrose, especially in Sorghum.
- Treatment
- Reduction in irradiancee0
- Outcome
- rate of incorporation of 14C into sucrosee0
- Direction
- reducede0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in irradiance reduced the rate of incorporation of 14C into sucrose, especially in Sorghum”
Claim · model-written summary
Reduced irradiance caused amino acid accumulation in both species.
Not reportedTaxonComparator
Verbatim
e0“Reduction in irradiance reduced the rate of incorporation of 14C into sucrose, especially in Sorghum, and led to the accumulation of amino acids in both species”
Claim · model-written summary
Species differences in assimilate export were apparently unrelated to sucrose labelling rate.
Not reportedTaxonOrgan / stage
Verbatim
e0“species differences in export of 14C-labelled assimilate were not apparently related to the rate of 14C incorporation into sucrose”
Claim · model-written summary
Starch was labelled rapidly at the outset.
- Outcome
- rapid initial labelling of starche0
Not reportedTaxon
Verbatim
e0“There was a rapid initial labelling of starch”
Claim · model-written summary
High irradiance enhanced the proportion of carbon incorporated as starch, especially in Sorghum.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the proportion of *14C incorporated as starch was enhanced at high irradiance, particularly in Sorghum”
Claim · model-written summary
Higher irradiance favored starch storage relative to phloem movement.
- Treatment
- high irradiancee0
- Outcome
- partitioning of assimilate into storage (starch)e0
- Direction
- greatere0
Not reportedTaxon
Verbatim
e0“greater partitioning of assimilate into storage (starch) at high irradiance relative to assimilate moving into the phloem”
Claim · model-written summary
Irradiance from 20 to 96 W m-2 did not directly influence vein loading.
- Treatment
- irradiancee0
- Outcome
- vein loadinge0
- Direction
- did not directly influencee0
- Qualifier
- in the range 20-96 W m-2e0
Not reportedTaxon
Verbatim
e0“irradiance (in the range 20-96 W m-2) did not directly influence vein loading”
The same questions in other papers
light · molecular: metabolites · SorghumPositive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- no effect
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.