Abstract
In Uganda, rain-fed crops frequently encounter cycles of drought stress followed by rewatering. Thus, with escalating fluctuations in water supply, drought recovery has become a critical focus for future sorghum drought phenotyping, genetics, and breeding research. However, there is currently a low knowledge of the drought recovery potential of prospective genotypes in Uganda’s National Sorghum Improvement Program. The present study aimed to assess the response of selected genotypes to rewatering after drought. Sixteen sorghum genotypes and two check varieties were evaluated under two contrasting moisture regimes: well-watered and drought stress-rewatering in a split-plot layout using a randomized complete block design (RCBD). Watering regimes were assigned to whole plots, while sorghum genotypes were assigned to subplots, with three replications. The results showed highly significant effects (p < 0.05) of drought stress on key agronomic traits, decreased dry weight, grain weight, and biomass yield by 39%, 43% and 37%, respectively, and delayed flowering by an average of 11 days. Key genotype-specific traits associated with drought recovery included rapid rehydration, compensatory growth, and maintenance of high relative chlorophyll content, all of which were essential for optimizing yields after stress. Leveraging drought tolerance indices, genotypes were ranked by their recovery potential and further classified into four distinct groups (A–D) based on their yield performance and stability under the two watering regimes. Genotypes in category A demonstrated high yield stability and strong recovery potential. Conversely, genotypes in category D exhibited the poorest recovery response. Overall, the information generated from this study will support future sorghum breeding efforts for drought resilience.
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Claims 8
Claim · model-written summary
Drought stress decreased sorghum dry weight by 39% relative to well-watered plants.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“highly significant effects (p < 0.05) of drought stress on key agronomic traits, decreased dry weight, grain weight, and biomass yield by 39%, 43% and 37%, respectively”
e2“Sixteen sorghum genotypes and two check varieties were evaluated under two contrasting moisture regimes: well-watered and drought stress-rewatering”
Claim · model-written summary
Drought stress decreased sorghum grain weight by 43% relative to well-watered plants.
- Treatment
- drought stresse1
- Outcome
- grain weighte1
- Direction
- decreasede1
- Value
- 43%e1
- Comparator
- well-waterede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“highly significant effects (p < 0.05) of drought stress on key agronomic traits, decreased dry weight, grain weight, and biomass yield by 39%, 43% and 37%, respectively”
e2“Sixteen sorghum genotypes and two check varieties were evaluated under two contrasting moisture regimes: well-watered and drought stress-rewatering”
Claim · model-written summary
Drought stress decreased sorghum biomass yield by 37% relative to well-watered plants.
- Treatment
- drought stresse1
- Outcome
- biomass yielde1
- Direction
- decreasede1
- Value
- 37%e1
- Comparator
- well-waterede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“highly significant effects (p < 0.05) of drought stress on key agronomic traits, decreased dry weight, grain weight, and biomass yield by 39%, 43% and 37%, respectively”
e2“Sixteen sorghum genotypes and two check varieties were evaluated under two contrasting moisture regimes: well-watered and drought stress-rewatering”
Claim · model-written summary
Drought stress delayed sorghum flowering by an average of 11 days relative to well-watered plants.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Sixteen sorghum genotypes and two check varieties were evaluated under two contrasting moisture regimes: well-watered and drought stress-rewatering”
e3“and delayed flowering by an average of 11 days”
e1“highly significant effects (p < 0.05) of drought stress on key agronomic traits, decreased dry weight, grain weight, and biomass yield by 39%, 43% and 37%, respectively”
Claim · model-written summary
Rapid rehydration, compensatory growth and maintained high relative chlorophyll content are genotype-specific traits associated with drought recovery.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Sixteen sorghum genotypes and two check varieties were evaluated under two contrasting moisture regimes: well-watered and drought stress-rewatering”
e4“Key genotype-specific traits associated with drought recovery included rapid rehydration, compensatory growth, and maintenance of high relative chlorophyll content, all of which were essential for optimizing yields after stress”
Claim · model-written summary
Sorghum genotypes were ranked by recovery potential and classified into four groups (A–D) by yield performance and stability.
- Outcome
- recovery potentiale5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Sixteen sorghum genotypes and two check varieties were evaluated under two contrasting moisture regimes: well-watered and drought stress-rewatering”
e5“genotypes were ranked by their recovery potential and further classified into four distinct groups (A–D) based on their yield performance and stability under the two watering regimes”
Claim · model-written summary
Category A genotypes showed high yield stability and strong recovery potential.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Sixteen sorghum genotypes and two check varieties were evaluated under two contrasting moisture regimes: well-watered and drought stress-rewatering”
e6“Genotypes in category A demonstrated high yield stability and strong recovery potential”
Claim · model-written summary
Category D genotypes showed the poorest recovery response.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Sixteen sorghum genotypes and two check varieties were evaluated under two contrasting moisture regimes: well-watered and drought stress-rewatering”
e7“genotypes in category D exhibited the poorest recovery response”
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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.