Abstract
The experiments were performed in 2010 at the Institute of Horticulture, Lithuanian Research Center for Agriculture and Forestry in the phytotron chambers, under controlled environment conditions. The aim of this study was to investigate the effect of different temperatures and photoperiod conditions on photosynthetic pigments accumulation, carbohydrate distribution and assimilative indices of radish (Raphanus sativus L. ‘Faraon’). The day/night temperature and photoperiod were maintained at 4oC and 8 hours (F1), 4oC and 16 hours (F2) in freezer chambers and 18/14°C and 8 hours (F3), 18/14°C and 16 hours (F4) in phytotron chambers, respectively. Just after cotyledons formation radishes were transferred to freezer chambers F1 and F2 for low positive temperature further (low-temperature) treatment, other plants were treated under F3 and F4 conditions. 14 days later radishes were moved from F1, F2 and F3 to the F4 conditions till the end of experiment (29 days). Our investigation revealed that low-temperature (4oC) influenced the development of radishes by increasing biomass accumulation in storage organs further (roots) and accelerating plant growth (relative growth rate, net assimilation rate). Increased shoot-to-root ratio and specific leaf area showed that under ordinary temperature conditions (18/14oC) radish grew more leaves but accumulated less assimilative products in roots. The lowest photosynthetic pigments concentration was found under longday photoperiod independent of temperature treatment (F2 and F4). After the 1st measurement, in F2 treatment the highest and in F3 the lowest content of all carbohydrates in roots and leaves further (shoots) were determined but after the 2nd measurement there were no big differences between all treatments, because in 29 days growing under ordinary temperature and long-day period the development level of differently treated radishes equalized. In summary, low temperature had the strongest effect on the carbohydrate accumulation in roots and shoots. At the maturity stage, there were no differences in carbohydrate contents. Moreover, the dry weight of roots increased due to carbohydrates allocation from shoots to roots. Under low-temperature and short-day photoperiod relative growth and net assimilation rates of radishes were higher during all experiment.
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Claims 12
Claim · model-written summary
Low temperature increased radish root biomass accumulation.
- Taxon
- radishes
Raphanus sativuse0 - Treatment
- low-temperature (4oC)e0
- Outcome
- biomass accumulation in storage organs further (roots)e0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low-temperature (4oC) influenced the development of radishes by increasing biomass accumulation in storage organs further (roots) and accelerating plant growth (relative growth rate, net assimilation rate).”
Claim · model-written summary
Low temperature accelerated relative growth and net assimilation rates.
- Taxon
- radishesRaphanus sativuse0
- Treatment
- low-temperature (4oC)e0
- Outcome
- relative growth rate, net assimilation ratee0
- Direction
- acceleratinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low-temperature (4oC) influenced the development of radishes by increasing biomass accumulation in storage organs further (roots) and accelerating plant growth (relative growth rate, net assimilation rate).”
Claim · model-written summary
Ordinary temperature increased the shoot-to-root ratio and specific leaf area.
- Taxon
- radishRaphanus sativuse0
- Treatment
- ordinary temperature conditions (18/14oC)e0
- Outcome
- shoot-to-root ratio and specific leaf areae0
- Direction
- Increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased shoot-to-root ratio and specific leaf area showed that under ordinary temperature conditions (18/14oC) radish grew more leaves but accumulated less assimilative products in roots.”
Claim · model-written summary
At ordinary temperature, radish accumulated less assimilative product in roots.
- Taxon
- radishRaphanus sativuse0
- Treatment
- ordinary temperature conditions (18/14oC)e0
- Outcome
- assimilative products in rootse0
- Direction
- lesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under ordinary temperature conditions (18/14oC) radish grew more leaves but accumulated less assimilative products in roots.”
Claim · model-written summary
Long-day photoperiod gave the lowest photosynthetic pigment concentration regardless of temperature.
- Taxon
- radishRaphanus sativust0
- Treatment
- longday photoperiode0
- Outcome
- photosynthetic pigments concentratione0
- Direction
- loweste0
- Qualifier
- independent of temperature treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest photosynthetic pigments concentration was found under longday photoperiod independent of temperature treatment (F2 and F4).”
t0“radish”
Claim · model-written summary
At the first measurement, F2 had the highest carbohydrate content in roots and shoots.
- Taxon
- radishRaphanus sativust0
- Treatment
- F2 treatmente0
- Outcome
- content of all carbohydrates in roots and leaves further (shoots)e0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the 1st measurement, in F2 treatment the highest and in F3 the lowest content of all carbohydrates in roots and leaves further (shoots) were determined”
t0“radish”
Claim · model-written summary
At the first measurement, F3 had the lowest carbohydrate content in roots and shoots.
- Taxon
- radishRaphanus sativust0
- Treatment
- F3e0
- Outcome
- content of all carbohydrates in roots and leaves further (shoots)e0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the 1st measurement, in F2 treatment the highest and in F3 the lowest content of all carbohydrates in roots and leaves further (shoots) were determined”
t0“radish”
Claim · model-written summary
By the second measurement, carbohydrate content differed little among treatments.
- Taxon
- radishRaphanus sativust0
- Outcome
- differences between all treatmentse0
- Direction
- no big differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after the 2nd measurement there were no big differences between all treatments”
t0“radish”
Claim · model-written summary
Radish development levels equalized after 29 days at ordinary temperature and long days.
- Taxon
- radishesRaphanus sativuse0
- Treatment
- ordinary temperature and long-day periode0
- Outcome
- development levele0
- Direction
- equalizede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 29 days growing under ordinary temperature and long-day period the development level of differently treated radishes equalized.”
Claim · model-written summary
At maturity, carbohydrate contents did not differ.
- Taxon
- radishRaphanus sativust0
- Organ / stage
- maturity stagee0
- Outcome
- carbohydrate contentse0
- Direction
- no differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the maturity stage, there were no differences in carbohydrate contents.”
t0“radish”
Claim · model-written summary
Root dry weight increased with carbohydrate allocation from shoots to roots.
- Taxon
- radishRaphanus sativust0
- Outcome
- dry weight of roots increasede0
- Qualifier
- carbohydrates allocation from shoots to rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the dry weight of roots increased due to carbohydrates allocation from shoots to roots.”
t0“radish”
Claim · model-written summary
Low temperature combined with short days raised relative growth and net assimilation rates throughout the experiment.
- Taxon
- radishesRaphanus sativuse0
- Treatment
- low-temperature and short-day photoperiode0
- Outcome
- relative growth and net assimilation ratese0
- Direction
- highere0
- Qualifier
- during all experimente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under low-temperature and short-day photoperiod relative growth and net assimilation rates of radishes were higher during all experiment.”
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