Claim · model-written summary
The rate of photosynthesis was consistently higher in the 8-hour photoperiod, by 28 and 25% over the 14-hour photoperiod at 6 and 8 weeks.
- Taxon
- rice
Oryza sativae0 - Treatment
- 8-hour photoperiode2
- Outcome
- ratee1
- Direction
- highere1
- Value
- 28 and 25%e2
- Comparator
- 14-houre2
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“how the rice plant responds to combinations of temperature and photoperiod”
e1“The rate was consistently higher in plants growing in the 8-hour photoperiod”
e2“The rate was higher in the 8-hour photoperiod compared to the 14-hour by 28 and 25% at 6 and 8 weeks respectively”
Title
Photoperiod and temperature effects on the growth and development of rice (Oryza sativa L.)
Azmi, Abdul Razzaque cIRcle (University of British Columbia) 2011. doi:10.14288/1.0302466
Other claims from this paper (19)
- Intervention effect The photoperiod effect on flowering was most pronounced at 35/26.5 and was significant in all varieties at that temperature.
- Intervention effect At 35/26.5, 14-hour photoperiod delayed flowering by 30, 30, 21 and 63 days in Kangni, Caloro, Dokri and Bluebonnet compared with the optimum photoperiod.
- Intervention effect At 35/18, flowering was delayed by 23, 14, 6 and 2 days.
- Intervention effect At 35/18, Dokri and Bluebonnet showed no significant photoperiodic effect on flowering.
- Intervention effect At 35/35, flowering was most unsatisfactory; a similar but less serious effect was found at 40.5/18.
- Intervention effect Final dry matter production was higher at 35/35 and 40.5/18 by 3 to 8 g per pot than at 35/26.5 and 35/18.
- Intervention effect Each 2-hour increase in photoperiod increased dry matter at maturity by about 5 g per pot.
- Intervention effect The 12-hour photoperiod gave panicles 2 to 4 cm longer than other photoperiods and 10 to 32 more spikelets per panicle at 10 and 12 hours than at 8 and 14 hours.
- Intervention effect Sterility was very high at 35/35 (95%) and 40.5/18 (69%), and averaged about 36% at 35/18 and 35/26.5.
- Intervention effect Between 10 and 12 hours of photoperiod, sterility was 8 to 24% lower than at 8 or 14 hours.
- Intervention effect Hundred-grain weight was unaffected by photoperiod or temperature.
- Intervention effect Tiller numbers were high at 40.5/18 and 35/18 and low at 35/35; plants at 14-hour photoperiod had more tillers.
- Intervention effect Leaf development was fastest at 40.5/18 and the 12-hour photoperiod; Kangni and Dokri developed faster than Caloro and Bluebonnet.
- Intervention effect Plant height was 2 to 5 cm greater at 2 weeks at 35/26.5 and 35/35, and greater at 35/18 at 4, 6 and 8 weeks; plants were shortest at 40.5/18.
- Observation Net photosynthesis per leaf blade weight was highest at 2 weeks and declined with plant age, by 71% in Dokri over 2 to 8 weeks.
- Intervention effect Net photosynthesis was highest at 40.5/18 except at 2 weeks, and higher in Caloro and Bluebonnet than in Kangni and Dokri.
- Observation Chlorophyll and carotenoid content declined with age in all varieties and were high at 40.5/18.
- Association A definite correlation between chlorophyll content and photosynthesis was not shown, but chlorophyll correlated significantly with fresh weight at all temperatures and photoperiods except at 2 weeks.
- Observation Total water soluble carbohydrate and total ash content showed no definite trends with growth stage, and no relationship with floral initiation.