Abstract
In a tropical savanna climate like Thailand, cassava can be planted all year round and harvested at 8 to 12 months after planting (MAP). However, it is not clear how water limitation during the dry season without rain affects carbon assimilation, partitioning, and yield. In this field investigation, six cassava genotypes were planted in the rainy season (August 2021) under continuous irrigation (control) or subjected to drought for 60 days from 3MAP to 5MAP during the dry season (November 2021 to January 2022) with no irrigation and rainfall. After that, the plants were rewatered and continued growing until harvest at 12MAP. After 60 days of stress, there were significant reductions in the mean net photosynthesis rate (Pn), petiole, and root dry weight (DW), and slight reductions in leaf, stem, and tuber DW. The mean starch concentrations were reduced by 42% and 16% in leaves and tubers, respectively, but increased by 12% in stems. At 6MAP after 30 days of rewatering, Pn fully recovered, and stem starch was remobilized resulting in a dramatic increase in the DW of all the organs. Although the mean tuber DW of the drought plants at 6MAP was significantly lower than that of the control, it was significantly higher at 12MAP. Moreover, the mean tuber starch concentration at 12MAP of the drought plants (18.81%) was also significantly higher than that of the controls (16.46%). In the drought treatment, the high-yielding varieties, RY9, RY72, KU50, and CMR38-125-77 were similarly productive in terms of tuber DW and starch concentration while the breeding line CM523-7 produced the lowest tuber biomass and significantly lower starch content. Therefore, for cassava planted in the rainy season in the tropical savanna climate, the exposure to drought during the early growth stage was more beneficial than the continuous irrigation.
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Claims 16
Claim · model-written summary
Early drought significantly reduced net photosynthesis.
- Taxon
- cassava
Manihot esculentat0 - Treatment
- 60 days of stresse0
- Outcome
- mean net photosynthesis rate (Pn)e0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 60 days of stress, there were significant reductions in the mean net photosynthesis rate (Pn), petiole, and root dry weight (DW), and slight reductions in leaf, stem, and tuber DW.”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
Early drought significantly reduced petiole and root dry weight.
- Taxon
- cassavaManihot esculentat0
- Treatment
- 60 days of stresse0
- Outcome
- petiole, and root dry weight (DW)e0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 60 days of stress, there were significant reductions in the mean net photosynthesis rate (Pn), petiole, and root dry weight (DW), and slight reductions in leaf, stem, and tuber DW.”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
Early drought slightly reduced leaf, stem and tuber dry weight.
- Taxon
- cassavaManihot esculentat0
- Treatment
- 60 days of stresse0
- Outcome
- leaf, stem, and tuber DWe0
- Direction
- slight reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 60 days of stress, there were significant reductions in the mean net photosynthesis rate (Pn), petiole, and root dry weight (DW), and slight reductions in leaf, stem, and tuber DW.”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
Drought reduced leaf starch concentration by 42%.
- Taxon
- cassavaManihot esculentat0
- Organ / stage
- leavese0
- Treatment
- droughtt1
- Outcome
- starch concentrationse0
- Direction
- reducede0
- Value
- 42%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean starch concentrations were reduced by 42% and 16% in leaves and tubers, respectively, but increased by 12% in stems.”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
Drought reduced tuber starch concentration by 16%.
- Taxon
- cassavaManihot esculentat0
- Organ / stage
- tuberse0
- Treatment
- droughtt1
- Outcome
- starch concentrationse0
- Direction
- reducede0
- Value
- 16%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean starch concentrations were reduced by 42% and 16% in leaves and tubers, respectively, but increased by 12% in stems.”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
Drought increased stem starch concentration by 12%.
- Taxon
- cassavaManihot esculentat0
- Organ / stage
- stemse0
- Treatment
- droughtt1
- Outcome
- starch concentrationse0
- Direction
- increasede0
- Value
- 12%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean starch concentrations were reduced by 42% and 16% in leaves and tubers, respectively, but increased by 12% in stems.”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
Net photosynthesis recovered after 30 days of rewatering.
- Taxon
- cassavaManihot esculentat0
- Outcome
- Pne0
- Direction
- fully recoverede0
- Qualifier
- after 30 days of rewateringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 6MAP after 30 days of rewatering, Pn fully recovered”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
Stem starch was remobilized following rewatering.
- Taxon
- cassavaManihot esculentat0
- Outcome
- stem starche0
- Direction
- remobilizede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stem starch was remobilized resulting in a dramatic increase in the DW of all the organs.”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
Dry weight of all organs increased dramatically after rewatering.
- Taxon
- cassavaManihot esculentat0
- Outcome
- DW of all the organse0
- Direction
- dramatic increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stem starch was remobilized resulting in a dramatic increase in the DW of all the organs.”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
Drought plants had lower tuber dry weight than controls at 6MAP.
- Taxon
- cassavaManihot esculentat0
- Treatment
- droughte0
- Outcome
- mean tuber DWe0
- Direction
- lowere0
- Qualifier
- 6MAPe0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the mean tuber DW of the drought plants at 6MAP was significantly lower than that of the control”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
Drought plants had higher tuber dry weight than controls at 12MAP.
- Taxon
- cassavaManihot esculentat0
- Treatment
- droughte0
- Outcome
- mean tuber DWe0
- Direction
- highere0
- Qualifier
- 12MAPe0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although the mean tuber DW of the drought plants at 6MAP was significantly lower than that of the control, it was significantly higher at 12MAP.”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
At 12MAP drought plants had significantly higher tuber starch concentration than controls.
- Taxon
- cassavaManihot esculentat0
- Treatment
- droughte0
- Outcome
- mean tuber starch concentratione0
- Direction
- highere0
- Value
- 18.81%e0
- Qualifier
- 16.46%e0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the mean tuber starch concentration at 12MAP of the drought plants (18.81%) was also significantly higher than that of the controls (16.46%).”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
RY9, RY72, KU50 and CMR38-125-77 were similarly productive in tuber dry weight and starch concentration under drought.
- Taxon
- cassavaManihot esculentat0
- Material
- RY9, RY72, KU50, and CMR38-125-77e0
- Outcome
- tuber DW and starch concentratione0
- Direction
- similarly productivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the high-yielding varieties, RY9, RY72, KU50, and CMR38-125-77 were similarly productive in terms of tuber DW and starch concentration”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
CM523-7 had the lowest tuber biomass under drought.
- Taxon
- cassavaManihot esculentat0
- Material
- CM523-7e0
- Outcome
- tuber biomasse0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the breeding line CM523-7 produced the lowest tuber biomass and significantly lower starch content.”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
CM523-7 had significantly lower starch content under drought.
- Taxon
- cassavaManihot esculentat0
- Material
- CM523-7e0
- Outcome
- starch contente0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the breeding line CM523-7 produced the lowest tuber biomass and significantly lower starch content.”
t0“Cassava”
t1“Photosynthetic Performance, Carbohydrate Partitioning, Growth, and Yield among Cassava Genotypes under Full Irrigation and Early Drought Treatment in a Tropical Savanna Climate”
Claim · model-written summary
The authors conclude early drought is more beneficial than continuous irrigation for rainy season cassava.
- Taxon
- cassavaManihot esculentae0
- Outcome
- exposure to drought during the early growth stagee0
- Comparator
- continuous irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for cassava planted in the rainy season in the tropical savanna climate, the exposure to drought during the early growth stage was more beneficial than the continuous irrigation.”
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See all 25 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.