Abstract
Silicon (Si) is a beneficial element that facilitates plant adaptation to abiotic stress conditions, including heat stress. The aim of this study was to evaluate the role of Si through the application of two silicon compounds, namely, potassium silicate (SiK) and calcium silicate (SiCa), at different commercial application rates (1 L ha−1 and 2 L ha−1 for SiK; and 1.5 L ha−1 and 3 L ha−1 for SiCa) to alleviate the effects of elevated day/night temperatures (HT = 40°C/30°C) in two rice genotypes [Fedearroz 67 (tolerant) and Fedearroz 2000 (susceptible)]. Two experiments were conducted. In the first (E1), four treatment groups were established in Fedearroz 67 plants: control (CK = 30°/25°C), HT without silicon, HT with SiK at 2 L ha−1 (drench), and HT with SiCa at 3 L ha−1 (drench). In the second (E2), treatments (CK, HT, HT + SiK at 1 or 2 L ha−1, and HT + SiCa at 1.5 or 3 L ha−1) were applied to Fedearroz 67 and Fedearroz 2000 genotypes. In E1, Si drench increased stomatal conductance (gs: 363.8 mmol m−2 s−1), Fv/Fm ratio (0.69), and chlorophyll content (28.5 SPAD units) compared to HT Fedearroz 67 plants (145.7 mmol m−2 s−1 for gs, 0.46 for Fv/Fm, and 16.8 SPAD units). In E2, SiK had a higher relative tolerance index (RTI) in HT Fedearroz 67, with no differences in HT Fedearroz 2000. In conclusion, SiK or SiCa can mitigate heat stress effects on rice in tropical environments during high temperature periods.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Silicon drench increased stomatal conductance in heat-stressed Fedearroz 67 to 363.8 mmol m−2 s−1 versus 145.7.
- Taxon
- Rice
Oryza sativat0 - Material
- Fedearroz 67e0
- Treatment
- Si drenche0
- Outcome
- stomatal conductancee0
- Direction
- increasede0
- Value
- 363.8 mmol m−2 s−1e0
- Comparator
- HT Fedearroz 67 plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si drench increased stomatal conductance (gs: 363.8 mmol m−2 s−1), Fv/Fm ratio (0.69), and chlorophyll content (28.5 SPAD units) compared to HT Fedearroz 67 plants (145.7 mmol m−2 s−1 for gs, 0.46 for Fv/Fm, and 16.8 SPAD units)”
t0“Rice Seedlings”
Claim · model-written summary
Silicon drench increased Fv/Fm ratio to 0.69 versus 0.46 in heat-stressed Fedearroz 67.
- Taxon
- RiceOryza sativat0
- Material
- Fedearroz 67e0
- Treatment
- Si drenche0
- Outcome
- Fv/Fm ratioe0
- Direction
- increasede0
- Value
- 0.69e0
- Comparator
- HT Fedearroz 67 plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si drench increased stomatal conductance (gs: 363.8 mmol m−2 s−1), Fv/Fm ratio (0.69), and chlorophyll content (28.5 SPAD units) compared to HT Fedearroz 67 plants (145.7 mmol m−2 s−1 for gs, 0.46 for Fv/Fm, and 16.8 SPAD units)”
t0“Rice Seedlings”
Claim · model-written summary
Silicon drench increased chlorophyll content to 28.5 SPAD units versus 16.8 in heat-stressed Fedearroz 67.
- Taxon
- RiceOryza sativat0
- Material
- Fedearroz 67e0
- Treatment
- Si drenche0
- Outcome
- chlorophyll contente0
- Direction
- increasede0
- Value
- 28.5 SPAD unitse0
- Comparator
- HT Fedearroz 67 plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si drench increased stomatal conductance (gs: 363.8 mmol m−2 s−1), Fv/Fm ratio (0.69), and chlorophyll content (28.5 SPAD units) compared to HT Fedearroz 67 plants (145.7 mmol m−2 s−1 for gs, 0.46 for Fv/Fm, and 16.8 SPAD units)”
t0“Rice Seedlings”
Claim · model-written summary
SiK had higher relative tolerance index in heat-stressed Fedearroz 67.
- Taxon
- RiceOryza sativat0
- Material
- Fedearroz 67e0
- Treatment
- SiKe0
- Outcome
- relative tolerance indexe0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SiK had a higher relative tolerance index (RTI) in HT Fedearroz 67”
t0“Rice Seedlings”
Claim · model-written summary
No RTI difference was observed for heat-stressed Fedearroz 2000.
- Taxon
- RiceOryza sativat0
- Material
- Fedearroz 2000e0
- Treatment
- SiKe1
- Outcome
- relative tolerance indexe1
- Direction
- no differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with no differences in HT Fedearroz 2000”
e1“SiK had a higher relative tolerance index (RTI) in HT Fedearroz 67”
t0“Rice Seedlings”
The same questions in other papers
silicon atom · physiology: gas exchange · Oryza sativa (rice)Results differ
15 papers in the same direction as this paper
- positive
- positive
- positive
12 papers more in this group
See all 16 papers →silicon atom · physiology: photosynthesis · Oryza sativa (rice)Results differ
37 papers in the same direction as this paper · 3 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- no effect
38 papers more in this group
See all 42 papers →silicon atom · physiology: pigments · Oryza sativa (rice)Positive and negative results
35 papers in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- positive
34 papers more in this group
See all 38 papers →application · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results
45 papers in the same direction as this paper · 1 in the opposite direction
- positive
- positive
- no effect
43 papers more in this group
See all 47 papers →application · physiology: pigments · Oryza sativa (rice)Positive and negative results
48 papers in the same direction as this paper · 2 in the opposite direction · 1 reporting no difference from an alternative
- positive
- negative
- no effect
48 papers more in this group
See all 52 papers →application · physiology: gas exchange · Oryza sativa (rice)Results agree
10 papers in the same direction as this paper
- positive
- positive
- positive
7 papers more in this group
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.