Abstract
The growth irradiances in the primary habitats of newly popularised Chinese rice 'Gui-Chao 2' and modern U.S. rice varieties 'Bellemont' and 'Lemont' are quite different, with only 2-8 h sunshine per day in Guangzhou, China, and 8-12 h sunshine per day in Texas, U.S.A. The U.S. varieties Bellemont and Lemont adapted to higher photon irradiance, showing increase of photosynthesis and increase of leaf thickness under high photon irradiance (1000 µmol photons m-2 s-1). Bright light reduced leaf chlorophyll content less in Bellemont than in Gui-Chao 2. The Chinese variety Gui-Chao 2 seemed adapted to low photon irradiance, showed delayed leaf senescence and retained higher photosynthetic rate after 20 days shading treatment. Thus, the yield reduction under shading of Gui-Chao 2 was less than that of Bellemont. After treatment for 9 days at 1000 µmol photons m-2 s-1, the quantum yield and light- and CO2-saturated photosynthesis of Gui-Chao 2 was lower than that of Lemont, suggesting possible photoinhibition in Gui-Chao 2 under high irradiance. It was proposed that these varieties represent two light-intensity ecotypes of rice. The possible application of this research to rice breeding and agricultural cultivation is discussed.
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 9
Claim · model-written summary
Bellemont and Lemont increased photosynthesis at high photon irradiance.
- Taxon
- Rice
Oryza sativat0 - Material
- Bellemont and Lemonte0
- Treatment
- high photon irradiance (1000 µmol photons m-2 s-1)e0
- Outcome
- photosynthesise0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The U.S. varieties Bellemont and Lemont adapted to higher photon irradiance, showing increase of photosynthesis and increase of leaf thickness under high photon irradiance (1000 µmol photons m-2 s-1).”
t0“Rice”
Claim · model-written summary
Bellemont and Lemont increased leaf thickness at high photon irradiance.
- Taxon
- RiceOryza sativat0
- Material
- Bellemont and Lemonte1
- Treatment
- high photon irradiance (1000 µmol photons m-2 s-1)e0
- Outcome
- leaf thicknesse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“showing increase of photosynthesis and increase of leaf thickness under high photon irradiance (1000 µmol photons m-2 s-1)”
e1“Bellemont and Lemont”
t0“Rice”
Claim · model-written summary
Bright light reduced chlorophyll content less in Bellemont than Gui-Chao 2.
- Taxon
- RiceOryza sativat0
- Material
- Bellemonte0
- Treatment
- Bright lighte0
- Outcome
- leaf chlorophyll contente0
- Direction
- reducede0
- Comparator
- Gui-Chao 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bright light reduced leaf chlorophyll content less in Bellemont than in Gui-Chao 2.”
t0“Rice”
Claim · model-written summary
Gui-Chao 2 showed delayed leaf senescence after shade.
- Taxon
- RiceOryza sativat0
- Material
- Gui-Chao 2e0
- Treatment
- 20 days shading treatmente0
- Outcome
- leaf senescencee0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Chinese variety Gui-Chao 2 seemed adapted to low photon irradiance, showed delayed leaf senescence and retained higher photosynthetic rate after 20 days shading treatment.”
t0“Rice”
Claim · model-written summary
Gui-Chao 2 retained a higher photosynthetic rate after 20 days of shading.
- Taxon
- RiceOryza sativat0
- Material
- Gui-Chao 2e0
- Treatment
- 20 days shading treatmente0
- Outcome
- photosynthetic ratee0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gui-Chao 2 seemed adapted to low photon irradiance, showed delayed leaf senescence and retained higher photosynthetic rate after 20 days shading treatment.”
t0“Rice”
Claim · model-written summary
Shading reduced yield less in Gui-Chao 2 than Bellemont.
- Taxon
- RiceOryza sativat0
- Material
- Gui-Chao 2e0
- Treatment
- shadinge0
- Outcome
- yielde0
- Direction
- reductione0
- Comparator
- Bellemonte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield reduction under shading of Gui-Chao 2 was less than that of Bellemont”
t0“Rice”
Claim · model-written summary
After nine days at high irradiance, Gui-Chao 2 had lower quantum yield than Lemont.
- Taxon
- RiceOryza sativat0
- Material
- Gui-Chao 2e0
- Treatment
- treatment for 9 days at 1000 µmol photons m-2 s-1e0
- Outcome
- quantum yielde0
- Direction
- lowere0
- Comparator
- Lemonte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After treatment for 9 days at 1000 µmol photons m-2 s-1, the quantum yield and light- and CO2-saturated photosynthesis of Gui-Chao 2 was lower than that of Lemont”
t0“Rice”
Claim · model-written summary
After nine days at high irradiance, Gui-Chao 2 had lower light- and CO2-saturated photosynthesis than Lemont.
- Taxon
- RiceOryza sativat0
- Material
- Gui-Chao 2e0
- Treatment
- treatment for 9 days at 1000 µmol photons m-2 s-1e0
- Outcome
- light- and CO2-saturated photosynthesise0
- Direction
- lowere0
- Comparator
- Lemonte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After treatment for 9 days at 1000 µmol photons m-2 s-1, the quantum yield and light- and CO2-saturated photosynthesis of Gui-Chao 2 was lower than that of Lemont”
t0“Rice”
Claim · model-written summary
The authors proposed two light-intensity ecotypes represented by the rice varieties.
- Taxon
- riceOryza sativae0
- Outcome
- two light-intensity ecotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was proposed that these varieties represent two light-intensity ecotypes of rice.”
The same questions in other papers
photon · growth · Oryza sativa (rice)Positive and negative results
1 in the opposite direction
- negative
shade · physiology: photosynthesis · Oryza sativa (rice)Results differ
4 papers in the same direction as this paper · 8 in the opposite direction
- negative
- negative
- negative
9 papers more in this group
See all 13 papers →light · physiology: photosynthesis · Oryza sativa (rice)Results differ
23 papers in the same direction as this paper · 23 in the opposite direction
- negative
- negative
- negative
43 papers more in this group
See all 47 papers →shade · quality: postharvest · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
light · physiology: pigments · Oryza sativa (rice)Positive and negative results
4 papers in the same direction as this paper · 11 in the opposite direction
- no effect
- negative
- negative
12 papers more in this group
See all 16 papers →shade · yield · Oryza sativa (rice)Positive and negative results
55 papers in the same direction as this paper · 15 in the opposite direction
- negative
- positive
- positive
67 papers more in this group
See all 71 papers →light · growth · Oryza sativa (rice)Positive and negative results
54 papers in the same direction as this paper · 38 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- negative
- negative
91 papers more in this group
See all 95 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.