Abstract
The metabolic products of nitrogen (N) fixation in a legume can be amides or ureides. Chickpea (Cicer arientinum L.) is a cool-season legume which transports both ureides and amides from N fixation. Ureides are purine derivatives which are synthesized solely in the nodules. Drought-sensitive legumes accumulate ureides, but the regulation of these N fixation products during drought in chickpea is not yet known. The objectives of this study were (1) to measure the metabolic products of N fixation during drought and (2) to quantify the differences in N fixation among chickpea cultivars during drought by acetylene reduction activity under controlled environment conditions. Five chickpea cultivars were exposed to drought by soil dehydration. Plants were harvested at 1, 5, 10 and 15 d after drought and were analyzed for leaf and stem ureide concentrations and total N. In separate growth chamber experiments, N fixation was quantified daily. Leaf ureide and free amino acid concentrations were analyzed at 1, 5, and 15 d after drought. Drought increased ureide accumulation in drought-sensitive cultivars and decreased total N, alanine and asparagine concentrations over time. Drought-tolerant chickpea cultivars maintained ureide and amide concentrations during drought. Of the chickpea cultivars examined, Myles was the most drought tolerant and CDC Chico was the least. Further research on leaf ureides, alanine and asparagine concentrations would be valuable to determine if these metabolic products could serve as measures for screening chickpea germplasm for drought-tolerant N fixation. Key words: Ureides, N fixation, Asparagine, Acetylene reduction
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Claims 5
Claim · model-written summary
Drought increased ureide accumulation in drought-sensitive chickpea cultivars.
- Taxon
- chickpea
Cicer arietinumt0 - Material
- drought-sensitive cultivarse1
- Treatment
- Droughte1
- Outcome
- ureide accumulatione1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“nitrogen-fixing chickpea”
e1“Drought increased ureide accumulation in drought-sensitive cultivars”
Claim · model-written summary
Drought decreased total N, alanine and asparagine concentrations in chickpea over time.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- Droughte1
- Outcome
- total N, alanine and asparagine concentrationse2
- Direction
- decreasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“nitrogen-fixing chickpea”
e1“Drought increased ureide accumulation in drought-sensitive cultivars”
e2“decreased total N, alanine and asparagine concentrations over time”
Claim · model-written summary
Drought-tolerant chickpea cultivars maintained ureide and amide concentrations during drought.
- Taxon
- chickpeaCicer arietinume3
- Material
- Drought-tolerant chickpea cultivarse3
- Treatment
- droughte3
- Outcome
- ureide and amide concentrationse3
- Direction
- no_changeinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Drought-tolerant chickpea cultivars maintained ureide and amide concentrations during drought”
Claim · model-written summary
Myles was the most drought tolerant of the chickpea cultivars examined.
- Taxon
- chickpeaCicer arietinume4
- Material
- Mylese4
- Outcome
- most drought tolerante4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Of the chickpea cultivars examined, Myles was the most drought tolerant and CDC Chico was the least”
Claim · model-written summary
CDC Chico was the least drought tolerant of the chickpea cultivars examined.
- Taxon
- chickpeaCicer arietinume4
- Material
- CDC Chicoe4
- Outcome
- the leaste4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Of the chickpea cultivars examined, Myles was the most drought tolerant and CDC Chico was the least”
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See all 11 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.