Abstract
Abstract Unavailability of information on photoperiod sensitivity of traditional rice is a disadvantage in breeding rice for adaptation to changing climatic conditions and for optimum plant architecture. This experiment was conducted to address the above problem through determination of variation in days to flowering (DF) and morphological traits of twenty eight selected very early maturing Sri Lankan traditional rice accessions under three photoperiod conditions: short day (SD), day neutral (DN) and long day (LD). Although rice is considered to be a facultative short day plant, 12 accessions (2088, 2979, 4615, 3970, 4245, 2091, 3450, 3883, 4217, 6741, 3738 and 3677) flowered significantly late under SD over LD, while accession 4223 flowered significantly late under DN. Fifteen accessions (3943, 4042, 4734, 3693, 4513, 3845, 4390, 4144, 4220, 4223, 4237, 4387, Bg 300, At 308 and Bg 379-2) flowered significantly early under SD over LD. Four accessions (3457, 3884, 6305 and 4358) were non-responsive to photoperiod for flowering time. Plant height significantly increased only in accession 4217 under SD. Higher plant height under DN was obtained from At 308 and accession 3883. Photoperiod did not affect plant height in accession 4237 and Bg 379-2. LD only or both LD and DN conditions produced significantly higher plant height irrespective of photoperiod responsiveness for DF in rest 26 accessions. Variation in response to photoperiod for DF and plant architecture in very early maturing Sri Lankan rice indicates the potential diversity of genetic factors for photoperiod response for future use in rice breeding.
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Claims 11
Claim · model-written summary
Twelve listed rice accessions flowered significantly later under short than long days.
- Taxon
- rice
Oryza sativae0 - Material
- 2088, 2979, 4615, 3970, 4245, 2091, 3450, 3883, 4217, 6741, 3738 and 3677e0
- Treatment
- SDe0
- Outcome
- flowerede0
- Direction
- latee0
- Comparator
- LDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although rice is considered to be a facultative short day plant, 12 accessions (2088, 2979, 4615, 3970, 4245, 2091, 3450, 3883, 4217, 6741, 3738 and 3677) flowered significantly late under SD over LD”
Claim · model-written summary
Rice accession 4223 flowered significantly late under day-neutral conditions.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while accession 4223 flowered significantly late under DN.”
t0“Sri Lankan rice”
Claim · model-written summary
Fifteen listed rice accessions flowered significantly earlier under short than long days.
- Taxon
- riceOryza sativat0
- Material
- 3943, 4042, 4734, 3693, 4513, 3845, 4390, 4144, 4220, 4223, 4237, 4387, Bg 300, At 308 and Bg 379-2e0
- Treatment
- SDe0
- Outcome
- flowerede0
- Direction
- earlye0
- Comparator
- LDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fifteen accessions (3943, 4042, 4734, 3693, 4513, 3845, 4390, 4144, 4220, 4223, 4237, 4387, Bg 300, At 308 and Bg 379-2) flowered significantly early under SD over LD.”
t0“Sri Lankan rice”
Claim · model-written summary
Four listed rice accessions were non-responsive to photoperiod for flowering time.
- Taxon
- riceOryza sativat0
- Material
- 3457, 3884, 6305 and 4358e0
- Treatment
- photoperiode0
- Outcome
- flowering timee0
- Direction
- non-responsivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Four accessions (3457, 3884, 6305 and 4358) were non-responsive to photoperiod for flowering time.”
t0“Sri Lankan rice”
Claim · model-written summary
Plant height increased significantly only in rice accession 4217 under short days.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant height significantly increased only in accession 4217 under SD.”
t0“Sri Lankan rice”
Claim · model-written summary
At 308 had higher plant height under day-neutral conditions.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher plant height under DN was obtained from At 308 and accession 3883.”
t0“Sri Lankan rice”
Claim · model-written summary
Accession 3883 had higher plant height under day-neutral conditions.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher plant height under DN was obtained from At 308 and accession 3883.”
t0“Sri Lankan rice”
Claim · model-written summary
Photoperiod did not affect height in rice accession 4237.
- Taxon
- riceOryza sativat0
- Material
- 4237e0
- Treatment
- Photoperiode0
- Outcome
- plant heighte0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photoperiod did not affect plant height in accession 4237 and Bg 379-2.”
t0“Sri Lankan rice”
Claim · model-written summary
Photoperiod did not affect height in Bg 379-2.
- Taxon
- riceOryza sativat0
- Material
- Bg 379-2e0
- Treatment
- Photoperiode0
- Outcome
- plant heighte0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photoperiod did not affect plant height in accession 4237 and Bg 379-2.”
t0“Sri Lankan rice”
Claim · model-written summary
Long days alone or both long and neutral days produced significantly higher height in the remaining 26 rice accessions, irrespective of flowering response.
- Taxon
- riceOryza sativat0
- Treatment
- LD only or both LD and DN conditionse0
- Outcome
- plant heighte0
- Direction
- highere0
- Qualifier
- irrespective of photoperiod responsiveness for DF in rest 26 accessionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“LD only or both LD and DN conditions produced significantly higher plant height irrespective of photoperiod responsiveness for DF in rest 26 accessions.”
t0“Sri Lankan rice”
Claim · model-written summary
Variation in photoperiod response suggests genetic-factor diversity for future rice breeding.
- Taxon
- riceOryza sativae0
- Outcome
- potential diversity of genetic factorse0
- Qualifier
- Variation in response to photoperiod for DF and plant architecturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Variation in response to photoperiod for DF and plant architecture in very early maturing Sri Lankan rice indicates the potential diversity of genetic factors for photoperiod response for future use in rice breeding.”
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