Abstract
The effects of an 8-hr photoperiod given to 7-, 14-, 21-, 28-, 35-, and 42-day-old seedlings for 1-, 2-, or 3-week periods at each age were studied in a late-winter variety of Indica rice. This photoperiod caused a remarkable delay in heading in the 7-day-old seedlings; treatment for 1 and 2 weeks gave no response in 14-day-old seedlings, but the same for 3 weeks caused a significant earliness of 78 days. Thus, this variety appears to cross the critical juvenile stage at the age of 14 days. The short photoperiod for a 1-week period delayed ear emergence in 21-day-old seedlings but for the 2- and 3-week periods markedly induced earlier flowering. Within 28 to 42 days of germination the short photoperiod caused a significant earliness in heading compared with control plants. Twenty-eight days appear to be the optimum age of photoresponsiveness for this variety, because at this age maximum earliness in ear emergence is seen with the minimum dose of the short photoperiod. A short photoperiod, in general, inhibited the production of tillers and leaves and markedly reduced plant height. It significantly decreased the grain yield from that of the controls, the decrease depending on the age at which the short photoperiod was administered and the duration of the treatment given at each age.
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Claims 10
Claim · model-written summary
An eight-hour photoperiod delayed heading in seven-day-old rice seedlings.
- Taxon
- Rice
Oryza sativat0 - Organ / stage
- 7-day-old seedlingse0
- Treatment
- 8-hr photoperiode1
- Outcome
- headinge0
- Direction
- delaye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This photoperiod caused a remarkable delay in heading in the 7-day-old seedlings;”
t0“Plant Age on Rice”
e1“an 8-hr photoperiod”
Claim · model-written summary
One or two weeks of short photoperiod caused no response at age 14 days.
- Taxon
- RiceOryza sativat0
- Organ / stage
- 14-day-old seedlingse0
- Treatment
- treatment for 1 and 2 weekse0
- Outcome
- responsee0
- Direction
- no responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatment for 1 and 2 weeks gave no response in 14-day-old seedlings”
t0“Plant Age on Rice”
Claim · model-written summary
Three weeks of short photoperiod advanced heading by 78 days at age 14 days.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but the same for 3 weeks caused a significant earliness of 78 days.”
t0“Plant Age on Rice”
Claim · model-written summary
The variety appears to cross the critical juvenile stage at 14 days.
- Taxon
- RiceOryza sativat0
- Outcome
- cross the critical juvenile stagee0
- Value
- 14 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thus, this variety appears to cross the critical juvenile stage at the age of 14 days.”
t0“Plant Age on Rice”
Claim · model-written summary
One week of short photoperiod delayed ear emergence in 21-day-old seedlings.
- Taxon
- RiceOryza sativat0
- Organ / stage
- 21-day-old seedlingse0
- Treatment
- short photoperiod for a 1-week periode0
- Outcome
- ear emergencee0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The short photoperiod for a 1-week period delayed ear emergence in 21-day-old seedlings”
t0“Plant Age on Rice”
Claim · model-written summary
Two or three weeks of short photoperiod advanced flowering at age 21 days.
- Taxon
- RiceOryza sativat0
- Treatment
- 2- and 3-week periodse0
- Outcome
- floweringe0
- Direction
- earliere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but for the 2- and 3-week periods markedly induced earlier flowering.”
t0“Plant Age on Rice”
Claim · model-written summary
Short photoperiod advanced heading in plants aged 28 to 42 days relative to controls.
- Taxon
- RiceOryza sativat0
- Treatment
- short photoperiode0
- Outcome
- headinge0
- Direction
- earlinesse0
- Qualifier
- 28 to 42 days of germinatione0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Within 28 to 42 days of germination the short photoperiod caused a significant earliness in heading compared with control plants.”
t0“Plant Age on Rice”
Claim · model-written summary
Rice at 28 days had maximal ear emergence advancement with the minimum short-photoperiod dose.
- Taxon
- RiceOryza sativat0
- Outcome
- maximum earliness in ear emergencee0
- Direction
- maximume0
- Value
- Twenty-eight dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Twenty-eight days appear to be the optimum age of photoresponsiveness for this variety, because at this age maximum earliness in ear emergence is seen with the minimum dose of the short photoperiod.”
t0“Plant Age on Rice”
Claim · model-written summary
Short photoperiod inhibited tiller and leaf production and reduced height.
- Taxon
- RiceOryza sativat0
- Treatment
- short photoperiode0
- Outcome
- production of tillers and leavese0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A short photoperiod, in general, inhibited the production of tillers and leaves and markedly reduced plant height.”
t0“Plant Age on Rice”
Claim · model-written summary
Short photoperiod reduced grain yield depending on seedling age and exposure duration.
- Taxon
- RiceOryza sativat0
- Treatment
- short photoperiode0
- Outcome
- grain yielde0
- Direction
- decreasede0
- Qualifier
- age at which the short photoperiod was administered and the duration of the treatmente0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It significantly decreased the grain yield from that of the controls, the decrease depending on the age at which the short photoperiod was administered and the duration of the treatment given at each age.”
t0“Plant Age on Rice”
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