Abstract
To enhance land use efficiency and meet rising cassava demand, cultivation is expected to expand into unsuitable lowland areas. This trend highlights the need for waterlogging-tolerant cassava genotypes. However, research on cassava survival mechanisms under waterlogged conditions through photosynthetic functions remains limited. This study investigated the physiological responses of cassava to waterlogging stress. It focused on photosynthesis, stomatal conductance, soil plant analysis development (SPAD), and chlorophyll fluorescence (Fv/Fm) to determine chlorophyll degradation and its effect on photoreceptors. Cassava was subjected to waterlogging by maintaining water-filled buckets throughout the treatment. Variables were measured periodically at intervals of 0, 3, 6, 9, 12, and 15 days after treatment (DAT). Results showed a reduction of net photosynthetic rate (A) by 82.6%, resulting from a 96.7% reduction in stomatal conductance (gs) and 21% in transpiration rate (E). A, gs, and E in three-month-old cassava varied and declined with increasing waterlogging duration, while SPAD value showed no significant differences compared to the control across all measurement dates. Fv/Fm showed a significant decrease at 3DAT followed by recovery, likely due to light de-excitation rather than chlorophyll degradation, as SPAD value remained unchanged, indicating no chlorophyll breakdown or photoreceptor damage in three-month-old cassava under waterlogging conditions. The study concluded that cassava exhibits a functional stay-green type of SPAD, and photosynthetic nitrogen use efficiency, along with stomatal and nonstomatal limitations that regulate photosynthesis under waterlogged conditions. Study provides insights into how cassava cope with waterlogging and guide breeding or agronomic strategies to improve their resilience in waterlogged environments.
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Claims 10
Claim · model-written summary
Waterlogging reduced cassava net photosynthetic rate by 82.6%.
Not reportedTaxonTreatmentComparator
Verbatim
e0“Results showed a reduction of net photosynthetic rate (A) by 82.6%”
Claim · model-written summary
Waterlogging reduced stomatal conductance by 96.7%.
Not reportedTaxonTreatmentComparator
Verbatim
e0“a 96.7% reduction in stomatal conductance (gs)”
Claim · model-written summary
Waterlogging reduced transpiration rate by 21%.
Not reportedTaxonTreatmentComparator
Verbatim
e0“21% in transpiration rate (E)”
Claim · model-written summary
Photosynthesis, stomatal conductance, and transpiration declined with longer waterlogging.
- Taxon
- cassava
Manihot esculentae0 - Organ / stage
- three-month-olde0
- Treatment
- waterlogging duratione0
- Outcome
- A, gs, and Ee0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A, gs, and E in three-month-old cassava varied and declined with increasing waterlogging duration”
Claim · model-written summary
SPAD did not differ significantly from controls across dates.
Not reportedTaxonTreatment
Verbatim
e0“SPAD value showed no significant differences compared to the control across all measurement dates”
Claim · model-written summary
Fv/Fm significantly decreased at 3DAT.
Not reportedTaxon
Verbatim
e0“Fv/Fm showed a significant decrease at 3DAT followed by recovery”
Claim · model-written summary
Fv/Fm subsequently recovered.
Not reportedTaxon
Verbatim
e0“Fv/Fm showed a significant decrease at 3DAT followed by recovery”
Claim · model-written summary
The authors attributed Fv/Fm recovery to light de-excitation rather than chlorophyll degradation.
Not reportedTaxon
Verbatim
e0“likely due to light de-excitation rather than chlorophyll degradation”
Claim · model-written summary
Waterlogged cassava showed functional stay-green SPAD and photosynthetic nitrogen use efficiency.
- Taxon
- cassavaManihot esculentae0
- Outcome
- functional stay-green type of SPAD, and photosynthetic nitrogen use efficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cassava exhibits a functional stay-green type of SPAD, and photosynthetic nitrogen use efficiency”
Claim · model-written summary
Stomatal and nonstomatal limitations regulate photosynthesis under waterlogging.
Not reportedTaxon
Verbatim
e0“stomatal and nonstomatal limitations that regulate photosynthesis under waterlogged conditions”