Abstract
Plants of cassava (Manihot esculenta Crantz) were raised in a sand root medium watered with nutrient solutions, under greenhouse conditions. As the N-supply increased, shoot dry mass was enhanced to a greater extent than root dry mass, thus leading to an increased shoot to root ratio. In leaves, contents of total soluble saccharides, non-reducing saccharides, and inorganic phosphate increased linearly with increasing N-supply. An opposite response was found for reducing saccharides and starch. In general, content of non-reducing saccharides was considerably greater than starch content. Activity of sucrose synthase was not detected, regardless of the N-treatments; by contrast, activity of neutral and acid invertases increased with increasing N-availability. Roots accumulated more total soluble saccharides, but less reducing saccharides and starch, as the N-supply increased. Photosynthetic rates decreased with increasing N-deficiency. Such a decrease was circumstantially associated to reducing saccharide, but not starch, accumulation. Results suggest a limited capacity for carbon export from source leaves under N-limitation.
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Claims 13
Claim · model-written summary
Increasing nitrogen supply enhanced cassava shoot dry mass more than root dry mass.
- Taxon
- cassava
Manihot esculentat0 - Treatment
- N-supplye0
- Outcome
- shoot dry masse0
- Direction
- enhancede0
- Qualifier
- to a greater extent than root dry masse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As the N-supply increased, shoot dry mass was enhanced to a greater extent than root dry mass, thus leading to an increased shoot to root ratio”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Increasing nitrogen supply raised the shoot to root ratio.
- Taxon
- cassavaManihot esculentat0
- Treatment
- N-supplye0
- Outcome
- shoot to root ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As the N-supply increased, shoot dry mass was enhanced to a greater extent than root dry mass, thus leading to an increased shoot to root ratio”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Leaf total soluble saccharides, non-reducing saccharides and inorganic phosphate increased linearly with nitrogen supply.
- Taxon
- cassavaManihot esculentat0
- Organ / stage
- leavese0
- Treatment
- N-supplye0
- Outcome
- contents of total soluble saccharides, non-reducing saccharides, and inorganic phosphatee0
- Direction
- increased linearlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In leaves, contents of total soluble saccharides, non-reducing saccharides, and inorganic phosphate increased linearly with increasing N-supply”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Leaf reducing saccharides and starch responded oppositely to nitrogen supply, decreasing as supply rose.
- Taxon
- cassavaManihot esculentat0
- Organ / stage
- leavese1
- Treatment
- N-supplye1
- Outcome
- reducing saccharides and starche0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An opposite response was found for reducing saccharides and starch”
t0“cassava (Manihot esculenta Crantz)”
e1“In leaves, contents of total soluble saccharides, non-reducing saccharides, and inorganic phosphate increased linearly with increasing N-supply”
Claim · model-written summary
Non-reducing saccharide content was considerably greater than starch content.
- Taxon
- cassavaManihot esculentat0
- Outcome
- content of non-reducing saccharidese0
- Direction
- greatere0
- Comparator
- starch contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“content of non-reducing saccharides was considerably greater than starch content”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Sucrose synthase activity was undetectable across nitrogen treatments.
- Taxon
- cassavaManihot esculentat0
- Gene
- sucrose synthasee0
- Outcome
- Activity of sucrose synthase was not detectede0
- Qualifier
- regardless of the N-treatmentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Activity of sucrose synthase was not detected, regardless of the N-treatments”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Neutral and acid invertase activity increased with nitrogen availability.
- Taxon
- cassavaManihot esculentat0
- Treatment
- N-availabilitye0
- Gene
- neutral and acid invertasese0
- Outcome
- activity of neutral and acid invertasese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“activity of neutral and acid invertases increased with increasing N-availability”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Root total soluble saccharides accumulated more as nitrogen supply increased.
- Taxon
- cassavaManihot esculentat0
- Organ / stage
- Rootse0
- Treatment
- N-supplye0
- Outcome
- total soluble saccharidese0
- Direction
- accumulated moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roots accumulated more total soluble saccharides, but less reducing saccharides and starch, as the N-supply increased”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Root reducing saccharides and starch decreased as nitrogen supply increased.
- Taxon
- cassavaManihot esculentat0
- Organ / stage
- Rootse0
- Treatment
- N-supplye0
- Outcome
- reducing saccharides and starche0
- Direction
- lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roots accumulated more total soluble saccharides, but less reducing saccharides and starch, as the N-supply increased”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Photosynthetic rates decreased as nitrogen deficiency increased.
- Taxon
- cassavaManihot esculentat0
- Treatment
- N-deficiencye0
- Outcome
- Photosynthetic ratese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic rates decreased with increasing N-deficiency”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
The photosynthetic decrease was associated with reducing saccharide accumulation.
- Taxon
- cassavaManihot esculentat0
- Compound
- reducing saccharidee0
- Outcome
- Photosynthetic ratese1
- Qualifier
- circumstantiallye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Such a decrease was circumstantially associated to reducing saccharide, but not starch, accumulation”
t0“cassava (Manihot esculenta Crantz)”
e1“Photosynthetic rates decreased with increasing N-deficiency”
Claim · model-written summary
The photosynthetic decrease was not associated with starch accumulation.
- Taxon
- cassavaManihot esculentat0
- Compound
- starche0
- Outcome
- Photosynthetic ratese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not starch, accumulation”
t0“cassava (Manihot esculenta Crantz)”
e1“Photosynthetic rates decreased with increasing N-deficiency”
Claim · model-written summary
The authors suggest that nitrogen limitation restricts carbon export from cassava source leaves.
- Taxon
- cassavaManihot esculentat0
- Outcome
- carbon export from source leavese0
- Qualifier
- under N-limitatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results suggest a limited capacity for carbon export from source leaves under N-limitation”
t0“cassava (Manihot esculenta Crantz)”
The same questions in other papers
nitrogen · growth · Manihot esculenta (cassava)Positive and negative results
11 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- positive
9 papers more in this group
See all 13 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.