Abstract
Mungbean (Vigna radiata (L.) Wilczek) or green gram as a dryland grain legume is exposed to varied timings and severity of drought stress, resulting in variability in photoassimilate production. In order to evaluate some physiological responses in one mungbean cultivar to timing and severity of drought stress, a 3-replicate RCBD (randomized complete block design) field experiment was carried out during year 2004 year at the experimental farm of University College of Agriculture and Natural Resources, University of Tehran. Plants were exposed to either moderate or severe water deficit at either vegetative (VS) or reproductive growth stages (RS). Parameters were recorded at the middle stages of vegetative growth. In general, water stress reduced net photosynthesis rate (Pn), stomatal conductance (gs), transpiration rate (Tr) and leaf relative water content (RWC) while increasing leaf temperature (T). The greatest effects of drought on these parameters occurred at reproductive stage. Photosynthetic water use efficiency increased and decreased during VS and RS respectively. The results showed a clearly close correlation between RWC and gs in VS (r=0.912**) and RS (r=0.976**) treatments. Although water stress at vegetative growth stage significantly decreased Pn, gs, Tr, and RWC, these parameters were recovered upon rewatering at reproductive stage. It is concluded that to maximize mungbean Pn in dry zones, irrigation should be extended across all growth stages, especially during the reproductive stage. Keywords: Mungbean; Drought stress; Net photosynthesis rate; Stomatal conductance
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Claims 11
Claim · model-written summary
Water stress reduced net photosynthesis rate, stomatal conductance and transpiration rate in mungbean.
- Taxon
- Mungbean
.jpg?width=60)
Vigna radiatat0 - Treatment
- water stresse1
- Outcome
- net photosynthesis rate (Pn), stomatal conductance (gs), transpiration rate (Tr)e1
- Direction
- reducede1
- Setting
- experimental farm of University College of Agriculture and Natural Resources, University of Tehrane2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“GAS EXCHANGE PARAMETERS OF MUNGBEAN”
e1“In general, water stress reduced net photosynthesis rate (Pn), stomatal conductance (gs), transpiration rate (Tr) and leaf relative water content (RWC)”
e2“field experiment was carried out during year 2004 year at the experimental farm of University College of Agriculture and Natural Resources, University of Tehran”
Claim · model-written summary
Water stress reduced leaf relative water content in mungbean.
- Taxon
- MungbeanVigna radiatat0
- Treatment
- water stresse1
- Outcome
- leaf relative water content (RWC)e1
- Direction
- reducede1
- Setting
- experimental farm of University College of Agriculture and Natural Resources, University of Tehrane2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“GAS EXCHANGE PARAMETERS OF MUNGBEAN”
e1“In general, water stress reduced net photosynthesis rate (Pn), stomatal conductance (gs), transpiration rate (Tr) and leaf relative water content (RWC)”
e2“field experiment was carried out during year 2004 year at the experimental farm of University College of Agriculture and Natural Resources, University of Tehran”
Claim · model-written summary
Water stress increased leaf temperature in mungbean.
- Taxon
- MungbeanVigna radiatat0
- Treatment
- water stresse1
- Outcome
- leaf temperature (T)e3
- Direction
- increasinge3
- Setting
- experimental farm of University College of Agriculture and Natural Resources, University of Tehrane2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“GAS EXCHANGE PARAMETERS OF MUNGBEAN”
e1“In general, water stress reduced net photosynthesis rate (Pn), stomatal conductance (gs), transpiration rate (Tr) and leaf relative water content (RWC)”
e3“while increasing leaf temperature (T)”
e2“field experiment was carried out during year 2004 year at the experimental farm of University College of Agriculture and Natural Resources, University of Tehran”
Claim · model-written summary
Drought had its greatest effects on mungbean gas exchange and leaf water parameters at the reproductive stage.
- Taxon
- MungbeanVigna radiatat0
- Organ / stage
- reproductive stagee4
- Treatment
- droughte4
- Outcome
- effects of drought on these parameterse4
- Direction
- greateste4
- Setting
- experimental farm of University College of Agriculture and Natural Resources, University of Tehrane2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“GAS EXCHANGE PARAMETERS OF MUNGBEAN”
e4“The greatest effects of drought on these parameters occurred at reproductive stage”
e2“field experiment was carried out during year 2004 year at the experimental farm of University College of Agriculture and Natural Resources, University of Tehran”
Claim · model-written summary
Water deficit at the vegetative stage increased photosynthetic water use efficiency in mungbean.
- Taxon
- MungbeanVigna radiatat0
- Organ / stage
- VSe5
- Treatment
- water deficite6
- Outcome
- Photosynthetic water use efficiencye5
- Direction
- increasede5
- Setting
- experimental farm of University College of Agriculture and Natural Resources, University of Tehrane2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“GAS EXCHANGE PARAMETERS OF MUNGBEAN”
e5“Photosynthetic water use efficiency increased and decreased during VS and RS respectively”
e6“Plants were exposed to either moderate or severe water deficit at either vegetative (VS) or reproductive growth stages (RS)”
e2“field experiment was carried out during year 2004 year at the experimental farm of University College of Agriculture and Natural Resources, University of Tehran”
Claim · model-written summary
Water deficit at the reproductive stage decreased photosynthetic water use efficiency in mungbean.
- Taxon
- MungbeanVigna radiatat0
- Organ / stage
- RSe5
- Treatment
- water deficite6
- Outcome
- Photosynthetic water use efficiencye5
- Direction
- decreasede5
- Setting
- experimental farm of University College of Agriculture and Natural Resources, University of Tehrane2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“GAS EXCHANGE PARAMETERS OF MUNGBEAN”
e5“Photosynthetic water use efficiency increased and decreased during VS and RS respectively”
e6“Plants were exposed to either moderate or severe water deficit at either vegetative (VS) or reproductive growth stages (RS)”
e2“field experiment was carried out during year 2004 year at the experimental farm of University College of Agriculture and Natural Resources, University of Tehran”
Claim · model-written summary
Water stress at the vegetative stage significantly decreased net photosynthesis rate, stomatal conductance, transpiration rate and leaf relative water content in mungbean.
- Taxon
- MungbeanVigna radiatat0
- Organ / stage
- vegetative growth stagee7
- Treatment
- water stresse7
- Outcome
- Pn, gs, Tr, and RWCe7
- Direction
- decreasede7
- Setting
- experimental farm of University College of Agriculture and Natural Resources, University of Tehrane2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“GAS EXCHANGE PARAMETERS OF MUNGBEAN”
e7“Although water stress at vegetative growth stage significantly decreased Pn, gs, Tr, and RWC”
e2“field experiment was carried out during year 2004 year at the experimental farm of University College of Agriculture and Natural Resources, University of Tehran”
Claim · model-written summary
Rewatering at the reproductive stage recovered the water-stress-reduced parameters in mungbean.
- Taxon
- MungbeanVigna radiatat0
- Organ / stage
- reproductive stagee3
- Treatment
- rewateringe3
- Outcome
- these parameterse3
- Direction
- recoverede3
- Setting
- experimental farm of University College of Agriculture and Natural Resources, University of Tehrane2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“GAS EXCHANGE PARAMETERS OF MUNGBEAN”
e3“these parameters were recovered upon rewatering at reproductive stage”
e2“field experiment was carried out during year 2004 year at the experimental farm of University College of Agriculture and Natural Resources, University of Tehran”
Claim · model-written summary
Leaf relative water content and stomatal conductance were closely correlated in the vegetative stage of mungbean.
- Taxon
- MungbeanVigna radiatat0
- Organ / stage
- VSe3
- Outcome
- correlation between RWC and gse3
- Value
- r=0.912**e3
- Setting
- experimental farm of University College of Agriculture and Natural Resources, University of Tehrane2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“GAS EXCHANGE PARAMETERS OF MUNGBEAN”
e3“a clearly close correlation between RWC and gs in VS (r=0.912**)”
e2“field experiment was carried out during year 2004 year at the experimental farm of University College of Agriculture and Natural Resources, University of Tehran”
Claim · model-written summary
Leaf relative water content and stomatal conductance were closely correlated in the reproductive stage of mungbean.
- Taxon
- MungbeanVigna radiatat0
- Organ / stage
- RSe3
- Outcome
- correlation between RWC and gse3
- Value
- r=0.976**e3
- Setting
- experimental farm of University College of Agriculture and Natural Resources, University of Tehrane2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“GAS EXCHANGE PARAMETERS OF MUNGBEAN”
e3“a clearly close correlation between RWC and gs in VS (r=0.912**) and RS (r=0.976**)”
e2“field experiment was carried out during year 2004 year at the experimental farm of University College of Agriculture and Natural Resources, University of Tehran”
Claim · model-written summary
Irrigation should be extended across all growth stages, especially the reproductive stage, to maximize mungbean photosynthesis in dry zones.
- Taxon
- mungbeanVigna radiatae3
- Organ / stage
- reproductive stagee3
- Outcome
- irrigation should be extended across all growth stagese3
- Setting
- dry zonese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“GAS EXCHANGE PARAMETERS OF MUNGBEAN”
e3“It is concluded that to maximize mungbean Pn in dry zones, irrigation should be extended across all growth stages, especially during the reproductive stage”
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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.