Abstract
Abstract Increased cadmium (Cd) uptake from contaminated soils damages plant metabolism. The purpose of this study was to determine Cd‐induced time‐related changes in some shoot growth and physiological attributes, and their interrelationships in Cd‐tolerant (NM‐98) and sensitive (NM‐28) mungbean varieties. Shoot Cd and leaf chlorosis increased with a concomitant reduction in shoot dry weight, leaf area, relative growth rate (RGR), net assimilation rate (NAR) and relative leaf expansion rate. Reduction in transpiration rate ( E ) and stomatal conductance ( g s ) and increase in substomatal CO 2 level ( C i ), indicated that Cd reduced net photosynthesis ( P n ) by reducing CO 2 fixation by Rubisco, albeit these changes were less pronounced in NM‐98. A positive correlation of chlorosis with shoot Cd, and negative relationships of chlorosis and shoot Cd with P n revealed that Cd damages the photosynthetic apparatus in mungbean. Time course decrease in in vivo nitrate reductase activity (NRA) and an increase in soluble nitrate in NM‐28 revealed that Cd markedly hampers nitrogen assimilation. Positive correlations of RGR and NAR with P n and NRA and negative ones with chlorosis, shoot dry weight, shoot Cd and C i in NM‐98 suggested that mungbean sensitivity to Cd is due to perturbed C and N assimilation.
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Claims 13
Claim · model-written summary
Cadmium increased shoot Cd and leaf chlorosis.
- Taxon
- Mungbean
.jpg?width=60)
Vigna radiatat0 - Treatment
- Cadmiumt0
- Outcome
- Shoot Cd and leaf chlorosise0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Shoot Cd and leaf chlorosis increased with a concomitant reduction in shoot dry weight, leaf area, relative growth rate (RGR), net assimilation rate (NAR) and relative leaf expansion rate.”
t0“Cadmium on Carbon and Nitrogen Assimilation in Shoots of Mungbean”
Claim · model-written summary
Cadmium reduced shoot dry weight, leaf area and relative growth rate.
- Taxon
- MungbeanVigna radiatat0
- Treatment
- Cadmiumt0
- Outcome
- shoot dry weight, leaf area, relative growth rate (RGR)e0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot Cd and leaf chlorosis increased with a concomitant reduction in shoot dry weight, leaf area, relative growth rate (RGR), net assimilation rate (NAR) and relative leaf expansion rate.”
t0“Cadmium on Carbon and Nitrogen Assimilation in Shoots of Mungbean”
Claim · model-written summary
Cadmium reduced net assimilation and relative leaf expansion rates.
- Taxon
- MungbeanVigna radiatat0
- Treatment
- Cadmiumt0
- Outcome
- net assimilation rate (NAR) and relative leaf expansion ratee0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduction in shoot dry weight, leaf area, relative growth rate (RGR), net assimilation rate (NAR) and relative leaf expansion rate.”
t0“Cadmium on Carbon and Nitrogen Assimilation in Shoots of Mungbean”
Claim · model-written summary
Cadmium reduced transpiration rate and stomatal conductance.
- Taxon
- MungbeanVigna radiatat0
- Treatment
- Cadmiumt0
- Outcome
- transpiration rate ( E ) and stomatal conductance ( g s )e0
- Direction
- Reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in transpiration rate ( E ) and stomatal conductance ( g s )”
t0“Cadmium on Carbon and Nitrogen Assimilation in Shoots of Mungbean”
Claim · model-written summary
Cadmium increased substomatal CO2 level.
- Taxon
- MungbeanVigna radiatat0
- Treatment
- Cadmiumt0
- Outcome
- substomatal CO 2 level ( C i )e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increase in substomatal CO 2 level ( C i )”
t0“Cadmium on Carbon and Nitrogen Assimilation in Shoots of Mungbean”
Claim · model-written summary
Cadmium reduced net photosynthesis by reducing Rubisco CO2 fixation.
- Taxon
- mungbeanVigna radiatat0
- Treatment
- Cde0
- Gene
- Rubiscoe0
- Outcome
- net photosynthesis ( P n )e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd reduced net photosynthesis ( P n ) by reducing CO 2 fixation by Rubisco”
t0“Mungbean”
Claim · model-written summary
These photosynthetic changes were less pronounced in NM‐98.
- Taxon
- MungbeanVigna radiatat0
- Material
- NM‐98e0
- Outcome
- changes were less pronouncede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these changes were less pronounced in NM‐98.”
t0“Mungbean”
Claim · model-written summary
Chlorosis correlated positively with shoot Cd.
- Taxon
- mungbeanVigna radiatat0
- Compound
- shoot Cde0
- Outcome
- chlorosise0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A positive correlation of chlorosis with shoot Cd”
t0“mungbean”
Claim · model-written summary
Chlorosis and shoot Cd were negatively related to photosynthesis.
- Taxon
- mungbeanVigna radiatat0
- Compound
- shoot Cde0
- Outcome
- P ne0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“negative relationships of chlorosis and shoot Cd with P n”
t0“mungbean”
Claim · model-written summary
In NM‐28 nitrate reductase activity decreased over time.
- Taxon
- MungbeanVigna radiatat0
- Material
- NM‐28e0
- Gene
- nitrate reductasee0
- Outcome
- in vivo nitrate reductase activity (NRA)e0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Time course decrease in in vivo nitrate reductase activity (NRA) and an increase in soluble nitrate in NM‐28”
t0“Mungbean”
Claim · model-written summary
In NM‐28 soluble nitrate increased.
- Taxon
- MungbeanVigna radiatat0
- Material
- NM‐28e0
- Outcome
- soluble nitratee0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increase in soluble nitrate in NM‐28”
t0“Mungbean”
Claim · model-written summary
Relative growth and net assimilation rates correlated positively with photosynthesis and nitrate reductase activity in NM‐98.
- Taxon
- MungbeanVigna radiatat0
- Material
- NM‐98e0
- Outcome
- RGR and NARe0
- Direction
- Positivee0
- Qualifier
- P n and NRAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Positive correlations of RGR and NAR with P n and NRA and negative ones with chlorosis, shoot dry weight, shoot Cd and C i in NM‐98”
t0“Mungbean”
Claim · model-written summary
Relative growth and net assimilation rates correlated negatively with chlorosis, shoot dry weight, shoot Cd and substomatal CO2 in NM‐98.
- Taxon
- MungbeanVigna radiatat0
- Material
- NM‐98e0
- Outcome
- chlorosis, shoot dry weight, shoot Cd and C ie0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“negative ones with chlorosis, shoot dry weight, shoot Cd and C i in NM‐98”
t0“Mungbean”
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- negative
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20 papers in the same direction as this paper
- negative
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See all 21 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.