Abstract
Abstract The long‐term effects of salt stress (11 dS m −1 ) and drought stress (35 % WHC) were investigated for two maize genotypes, focusing on the relation between metabolic changes around the time of pollination and the impact on yield determinants at maturity. The relatively salt‐resistant hybrid Pioneer 3906 and the relatively drought‐resistant hybrid Fabregas were compared. The experiments were conducted in large plastic containers in a vegetation hall in two consecutive years (2011 and 2012). Plant height and leaf area were significantly reduced under both stress conditions. The transpiration rate was only slightly reduced under drought stress; but under salt stress, a significant reduction occurred 40–53 days after sowing. As a significant increase in sucrose concentrations was observed in the salt‐treated maize kernels 2 days after pollination, the availability of assimilates was not limiting and the plants could afford to save water by reduced stomatal opening. Although under both stress conditions the soluble acid invertase activity was reduced 2 days after pollination, concomitantly, an increase in hexose concentrations was observed. Thus, in these experiments, the delivery of hexoses by acid invertase activity did not limit kernel development. Differences in grain yield at maturity between salt and drought stress were most likely caused by salt‐specific effects (Na + toxicity), Fabregas being more affected than Pioneer 3906.
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Claims 11
Claim · model-written summary
Plant height and leaf area were significantly reduced under salt stress.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant height and leaf area were significantly reduced under both stress conditions”
e1“salt stress (11 dS m −1 )”
t0“Maize”
Claim · model-written summary
Plant height and leaf area were significantly reduced under drought stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant height and leaf area were significantly reduced under both stress conditions”
e1“drought stress (35 % WHC)”
t0“Maize”
Claim · model-written summary
Transpiration rate was only slightly reduced under drought stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The transpiration rate was only slightly reduced under drought stress; but under salt stress, a significant reduction occurred 40–53 days after sowing”
t0“Maize”
Claim · model-written summary
Under salt stress, transpiration rate showed a significant reduction 40-53 days after sowing.
- Treatment
- salt stresse0
- Outcome
- transpiration ratee0
- Direction
- significant reductione0
- Qualifier
- 40–53 days after sowinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The transpiration rate was only slightly reduced under drought stress; but under salt stress, a significant reduction occurred 40–53 days after sowing”
t0“Maize”
Claim · model-written summary
Sucrose concentrations increased significantly in salt-treated maize kernels 2 days after pollination.
- Organ / stage
- kernels 2 days after pollinatione0
- Treatment
- salt‐treatede0
- Outcome
- sucrose concentrationse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant increase in sucrose concentrations was observed in the salt‐treated maize kernels 2 days after pollination”
Claim · model-written summary
Soluble acid invertase activity was reduced 2 days after pollination under both salt and drought stress.
- Treatment
- both stress conditionse0
- Gene
- soluble acid invertasee0
- Outcome
- soluble acid invertase activitye0
- Direction
- reducede0
- Qualifier
- 2 days after pollinatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although under both stress conditions the soluble acid invertase activity was reduced 2 days after pollination, concomitantly, an increase in hexose concentrations was observed”
t0“Maize”
Claim · model-written summary
Hexose concentrations increased 2 days after pollination under both salt and drought stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although under both stress conditions the soluble acid invertase activity was reduced 2 days after pollination, concomitantly, an increase in hexose concentrations was observed”
t0“Maize”
Claim · model-written summary
The authors conclude that delivery of hexoses by acid invertase activity did not limit kernel development in these experiments.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in these experiments, the delivery of hexoses by acid invertase activity did not limit kernel development”
t0“Maize”
Claim · model-written summary
The authors interpret the sucrose increase as meaning assimilate availability was not limiting, so plants could save water by reduced stomatal opening.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the availability of assimilates was not limiting and the plants could afford to save water by reduced stomatal opening”
t0“Maize”
Claim · model-written summary
Differences in grain yield at maturity between salt and drought stress were most likely caused by salt-specific effects (Na+ toxicity).
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in grain yield at maturity between salt and drought stress were most likely caused by salt‐specific effects (Na + toxicity)”
t0“Maize”
Claim · model-written summary
Fabregas was more affected than Pioneer 3906 in grain yield at maturity under salt and drought stress.
- Material
- Fabregase0
- Treatment
- salt and drought stresse1
- Outcome
- grain yield at maturitye2
- Direction
- more affectede0
- Comparator
- Pioneer 3906e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fabregas being more affected than Pioneer 3906”
e1“salt and drought stress”
e2“grain yield at maturity”
t0“Maize”
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