Abstract
The objective of this study was to investigate the root growth compensatory effects and cotton yield under drought stress. The results indicate that the root dry weight, boll weight, and cotton yield increased in both the drought-resistant cultivar (CCRI-45) and the drought-sensitive cultivar (CCRI-60). Compensation effects were exhibited under the three-day drought stress treatment at a soil relative water content (SRWC) of 60% and 45% during the seedling stage, and flowering and boll-forming stage over two years. The yield of the drought-resistant cultivar (CCRI-45) was higher than the control, however, following the six-day 45% SRWC drought treatments, the yield of the drought-sensitive cultivar (CCRI-60) was lower than the control. The soluble sugar content, proline content, superoxide dismutase (SOD) activity, and peroxidase (POD) activity of the roots increased under drought stress and then decreased after re-watering, although the values remained higher than those of the controls for a short period. These physiological measures may represent stress reactions and thus may not indicate factors that result in compensation effects. However, catalase (CAT) activity and gibberellic acid (GA) content of the roots decreased under drought stress. After re-watering, the CAT activity and the GA content increased and were significantly higher than those of the controls under the six-day 60% SRWC and 45% SRWC drought treatments. The abscisic acid (ABA) content of the roots increased under drought stress. After re-watering, the ABA content decreased to a lower level under the three and six-day 60% SRWC and 45% SRWC drought treatments than in the controls. According to an analysis of various indicators, the interaction between ABA and GA signals may play an important role in root growth compensatory effects. In summary, the results demonstrate that moderate drought stress is beneficial to root growth and yield. This conclusion is of great significance to improving our understanding of the maximum utilization of limited water resources.
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Claims 14
Claim · model-written summary
Root dry weight increased in both cotton cultivars after drought.
- Taxon
- cotton
Gossypium hirsutumt0 - Outcome
- root dry weighte0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root dry weight, boll weight, and cotton yield increased in both the drought-resistant cultivar (CCRI-45) and the drought-sensitive cultivar (CCRI-60)”
t0“cotton”
Claim · model-written summary
Boll weight increased in both cotton cultivars after drought.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- boll weighte0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root dry weight, boll weight, and cotton yield increased in both the drought-resistant cultivar (CCRI-45) and the drought-sensitive cultivar (CCRI-60)”
t0“cotton”
Claim · model-written summary
Cotton yield increased in both cultivars after drought.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- cotton yielde0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root dry weight, boll weight, and cotton yield increased in both the drought-resistant cultivar (CCRI-45) and the drought-sensitive cultivar (CCRI-60)”
Claim · model-written summary
CCRI-45 yield exceeded control after six-day drought.
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of the drought-resistant cultivar (CCRI-45) was higher than the control”
t0“cotton”
Claim · model-written summary
CCRI-60 yield fell below control after six-day 45% SRWC drought.
- Taxon
- cottonGossypium hirsutumt0
- Material
- CCRI-60e0
- Treatment
- six-day 45% SRWC drought treatmentse0
- Outcome
- yielde0
- Direction
- lowere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“following the six-day 45% SRWC drought treatments, the yield of the drought-sensitive cultivar (CCRI-60) was lower than the control”
t0“cotton”
Claim · model-written summary
Root soluble sugar and proline content rose during drought then fell after re-watering while briefly remaining above controls.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- rootse0
- Treatment
- drought stresse0
- Outcome
- soluble sugar content, proline contente0
- Direction
- increasede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soluble sugar content, proline content, superoxide dismutase (SOD) activity, and peroxidase (POD) activity of the roots increased under drought stress and then decreased after re-watering, although the values remained higher than those of the controls for a short period”
t0“cotton”
Claim · model-written summary
Root SOD and POD activity rose during drought then fell after re-watering while briefly remaining above controls.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- rootse0
- Treatment
- drought stresse0
- Outcome
- superoxide dismutase (SOD) activity, and peroxidase (POD) activitye0
- Direction
- increasede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soluble sugar content, proline content, superoxide dismutase (SOD) activity, and peroxidase (POD) activity of the roots increased under drought stress and then decreased after re-watering, although the values remained higher than those of the controls for a short period”
t0“cotton”
Claim · model-written summary
Root CAT activity and GA content decreased under drought.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- rootse0
- Treatment
- drought stresse0
- Outcome
- catalase (CAT) activity and gibberellic acid (GA) contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“catalase (CAT) activity and gibberellic acid (GA) content of the roots decreased under drought stress”
t0“cotton”
Claim · model-written summary
Root CAT activity rose above controls after re-watering following six-day drought.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- six-day 60% SRWC and 45% SRWC drought treatmentse0
- Outcome
- CAT activitye0
- Direction
- increasede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After re-watering, the CAT activity and the GA content increased and were significantly higher than those of the controls under the six-day 60% SRWC and 45% SRWC drought treatments”
t0“cotton”
Claim · model-written summary
Root GA content rose above controls after re-watering following six-day drought.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- six-day 60% SRWC and 45% SRWC drought treatmentse0
- Outcome
- GA contente0
- Direction
- increasede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After re-watering, the CAT activity and the GA content increased and were significantly higher than those of the controls under the six-day 60% SRWC and 45% SRWC drought treatments”
t0“cotton”
Claim · model-written summary
Root ABA content increased under drought.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- drought stresse0
- Outcome
- abscisic acid (ABA) contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The abscisic acid (ABA) content of the roots increased under drought stress”
t0“cotton”
Claim · model-written summary
Root ABA content after re-watering dropped below controls.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- three and six-day 60% SRWC and 45% SRWC drought treatmentse0
- Outcome
- ABA contente0
- Direction
- decreasede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After re-watering, the ABA content decreased to a lower level under the three and six-day 60% SRWC and 45% SRWC drought treatments than in the controls”
t0“cotton”
Claim · model-written summary
ABA and GA signaling interaction may contribute to root growth compensation.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- root growth compensatory effectse0
- Qualifier
- interaction between ABA and GA signalse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the interaction between ABA and GA signals may play an important role in root growth compensatory effects”
t0“cotton”
Claim · model-written summary
Moderate drought was concluded to benefit cotton root growth and yield.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- root growth and yielde0
- Direction
- beneficiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“moderate drought stress is beneficial to root growth and yield”
t0“cotton”
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