Abstract
Water deficit stress is a major factor that inhibits the overall growth and development in cassava (Manihot esculenta), leading to decreased storage root yield. We conducted a study to investigate whether thermal sensing could be used to indicate water deficit stress and the health and yield of cassava crops in field. The objective of the study was to use thermal imaging to determine relationship between crop water stress index (CWSI) and physiological changes, and to identify the critical CWSI point in fields of cassava cv. Rayong 9 under well-irrigated and water-deficit conditions. At the time of storage root initiation (85 DAP [day after planting]), thermal imagery was collected and the physiological changes and growth characters were measured prior to storage root harvesting (162 DAP). Thermal infrared imager was used to measure the canopy temperature and CWSI of cassava plants. Net photosynthetic rate (Pn), stomatal conductance (gs) and transpiration rates (Tr) of cassava plants under water deficit conditions for 29 d (114 DAP) were significantly decreased, leading to delayed plant growth as compared to those under well-irrigated conditions. In contrast, air vapor pressure deficit (VPDair) and CWSI in drought-stressed plants were higher than well irrigated plants. High correlations between Tr/gs/Pn and CWSI were observed. The study concludes that CWSI is a sensitive indicator of water deficit stress caused due to stomatal function.Abbreviations: CWSI: crop water stress index; DAP: day after planting; Pn: net photosynthetic rate; gs: stomatal conductance; Tr: transpiration rate; VPDair: air vapor pressure; RMSE: root mean square error
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Claims 6
Claim · model-written summary
Net photosynthetic rate, stomatal conductance and transpiration significantly decreased after 29 days of water deficit.
- Taxon
- cassava
Manihot esculentae0 - Treatment
- water deficit conditions for 29 d (114 DAP)e0
- Outcome
- Net photosynthetic rate (Pn), stomatal conductance (gs) and transpiration rates (Tr)e0
- Direction
- decreasede0
- Comparator
- well-irrigated conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net photosynthetic rate (Pn), stomatal conductance (gs) and transpiration rates (Tr) of cassava plants under water deficit conditions for 29 d (114 DAP) were significantly decreased, leading to delayed plant growth as compared to those under well-irrigated conditions”
t0“cassava physiology under water deficit condition”
Claim · model-written summary
Water deficit delayed cassava plant growth compared with well-irrigated conditions.
Verbatim
e0“leading to delayed plant growth as compared to those under well-irrigated conditions”
t0“cassava physiology under water deficit condition”
Claim · model-written summary
Air vapor pressure deficit was higher in drought-stressed plants than well irrigated plants.
Verbatim
e0“air vapor pressure deficit (VPDair) and CWSI in drought-stressed plants were higher than well irrigated plants”
t0“cassava physiology under water deficit condition”
Claim · model-written summary
CWSI was higher in drought-stressed plants than well irrigated plants.
Verbatim
e0“air vapor pressure deficit (VPDair) and CWSI in drought-stressed plants were higher than well irrigated plants”
t0“cassava physiology under water deficit condition”
Claim · model-written summary
CWSI correlated highly with transpiration, stomatal conductance and net photosynthesis.
Not reportedOrgan / stageDirection
Verbatim
e0“High correlations between Tr/gs/Pn and CWSI were observed”
t0“cassava physiology under water deficit condition”
Claim · model-written summary
CWSI was judged a sensitive indicator of water deficit caused by stomatal function.
- Taxon
- cassava physiology under water deficit conditiont0
- Outcome
- sensitive indicator of water deficit stresse0
- Qualifier
- caused due to stomatal functione0
Not reportedComparatorValue
Verbatim
e0“CWSI is a sensitive indicator of water deficit stress caused due to stomatal function”
t0“cassava physiology under water deficit condition”
The same questions in other papers
drought · physiology: photosynthesis · Manihot esculenta (cassava)Positive and negative results
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See all 11 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.