Abstract
The ability of rice to elongate coleoptiles under oxygen deprivation is a determinant of anaerobic germination tolerance, critical for successful direct seeding. Most studies on anaerobic coleoptile elongation have been performed under constant darkness or in flooded soils because a drilling method was the primary approach for direct seeding of rice. However, aerial seeding is becoming popular, in which seeds which land on flooded soils are exposed to light during the daytime. Here, we investigated physiological mechanisms underlying anaerobic elongation of coleoptiles under light and dark cycles. This study identified two novel varieties, LG and L202, enabling the development of long coleoptiles under oxygen limitation, comparable to well-characterized varieties with strong anaerobic germination tolerance. Germination experiments using these two tolerant and two intolerant varieties, including Takanari and IR64, revealed that light and dark cycles increased coleoptile length in LG, Takanari, and IR64 relative to constant darkness. Interestingly, even in intolerant lines, dramatic starch breakdown and soluble carbohydrate accumulation occurred under oxygen limitation. However, intolerant lines were more susceptible to a representative soluble sugar, glucose, than tolerant lines under oxygen deprivation, suggesting that coleoptile growth can be inhibited in intolerant lines due to hypersensitivity to soluble sugars accumulated in anaerobically germinating seeds.
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Claims 9
Claim · model-written summary
LG developed long coleoptiles under oxygen limitation, comparable to tolerant varieties.
- Taxon
- Rice
Oryza sativat0 - Material
- LGe0
- Outcome
- long coleoptilese0
- Qualifier
- under oxygen limitatione0
- Comparator
- well-characterized varieties with strong anaerobic germination tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study identified two novel varieties, LG and L202, enabling the development of long coleoptiles under oxygen limitation, comparable to well-characterized varieties with strong anaerobic germination tolerance.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
L202 developed long coleoptiles under oxygen limitation, comparable to tolerant varieties.
- Taxon
- RiceOryza sativat0
- Material
- L202e0
- Outcome
- long coleoptilese0
- Qualifier
- under oxygen limitatione0
- Comparator
- well-characterized varieties with strong anaerobic germination tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study identified two novel varieties, LG and L202, enabling the development of long coleoptiles under oxygen limitation, comparable to well-characterized varieties with strong anaerobic germination tolerance.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Light and dark cycles increased coleoptile length in LG relative to constant darkness.
- Taxon
- RiceOryza sativat0
- Material
- LGe0
- Treatment
- light and dark cyclese0
- Outcome
- coleoptile lengthe0
- Direction
- increasede0
- Comparator
- constant darknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light and dark cycles increased coleoptile length in LG, Takanari, and IR64 relative to constant darkness.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Light and dark cycles increased coleoptile length in Takanari relative to constant darkness.
- Taxon
- RiceOryza sativat0
- Material
- Takanarie0
- Treatment
- light and dark cyclese0
- Outcome
- coleoptile lengthe0
- Direction
- increasede0
- Comparator
- constant darknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light and dark cycles increased coleoptile length in LG, Takanari, and IR64 relative to constant darkness.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Light and dark cycles increased coleoptile length in IR64 relative to constant darkness.
- Taxon
- RiceOryza sativat0
- Material
- IR64e0
- Treatment
- light and dark cyclese0
- Outcome
- coleoptile lengthe0
- Direction
- increasede0
- Comparator
- constant darknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light and dark cycles increased coleoptile length in LG, Takanari, and IR64 relative to constant darkness.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Intolerant rice lines showed dramatic starch breakdown under oxygen limitation.
- Taxon
- RiceOryza sativat0
- Material
- intolerant linese0
- Outcome
- starch breakdowne0
- Qualifier
- under oxygen limitatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“even in intolerant lines, dramatic starch breakdown and soluble carbohydrate accumulation occurred under oxygen limitation.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Intolerant rice lines accumulated soluble carbohydrates under oxygen limitation.
- Taxon
- RiceOryza sativat0
- Material
- intolerant linese0
- Outcome
- soluble carbohydrate accumulatione0
- Qualifier
- under oxygen limitatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“even in intolerant lines, dramatic starch breakdown and soluble carbohydrate accumulation occurred under oxygen limitation.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Intolerant rice lines were more susceptible to glucose than tolerant lines under oxygen deprivation.
- Taxon
- RiceOryza sativat0
- Material
- intolerant linese0
- Compound
- glucosee0
- Outcome
- susceptible to a representative soluble sugar, glucosee0
- Direction
- more susceptiblee0
- Qualifier
- under oxygen deprivatione0
- Comparator
- tolerant linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intolerant lines were more susceptible to a representative soluble sugar, glucose, than tolerant lines under oxygen deprivation”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
The authors suggest soluble sugar hypersensitivity can inhibit coleoptile growth in intolerant lines.
- Taxon
- RiceOryza sativat0
- Material
- intolerant linese0
- Outcome
- coleoptile growth can be inhibitede0
- Qualifier
- hypersensitivity to soluble sugars accumulated in anaerobically germinating seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting that coleoptile growth can be inhibited in intolerant lines due to hypersensitivity to soluble sugars accumulated in anaerobically germinating seeds.”
t0“Rice (Oryza sativa L.)”
The same questions in other 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
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