Abstract
Abstract To identify rice grain genotypes with a lower cadmium content, 49 cultivars of rice were tested under upland conditions, using two types of soils contaminated with cadmium (A: alluvial and B: volcanic ash soil) in 1999 and 2000. Results of ranking of grain cadmium concentrations were similar between these 2 years. NIPPONBARE, KOSHIHIKARI, and HU-LO-TAO belonged to the rice grain group with the lowest cadmium contents. KASALATH could be categorized as a variety with a medium cadmium content, hereafter referred to as “medium cadmium variety,” and MILYANG23 and PEH-KUH-TSAO-TU as varieties with high cadmium contents, hereafter referred to as “high cadmium varieties.” These five varieties except for HU-LO-TAO from the above six typical varieties were grown in submerged pots (paddy conditions), and the ranking of the grain cadmium content was almost the same as that in the upland condition pots. These results imply that it may be possible to select paddy rice varieties with a low cadmium content even when growth occurred under upland conditions. The possibility of screening for lower cadmium content in rice grain in solution culture was examined. The shoot cadmium concentrations in solution culture were not significantly lower in NIPPONBARE and KOSHIHIKARI than those of MILYANG23 and PEH-KUH-TSAO-TU after 4 d of cadmium addition. Only PEH-KUH-TSAO-TU showed a higher shoot cadmium concentration than the other varieties after 27 d of cadmium addition. Thus, as a preliminary evaluation, a screening method using solution culture would not be suitable for detecting genotypes with a low cadmium content in grain within 1 month after cadmium addition. Our results suggest that the status of available cadmium in soil differs from that of available cadmium in solution culture. Cadmium distribution for grain (Le., grain cadmium content ratio to total uptake in the terrestrial part of plants) was evaluated among these 5 varieties. KASALATH absorbed a relatively high amount of cadmium, although cadmium distribution to grain in KASALATH was the lowest among the 5 varieties. On the other hand, in MILYANG23, a much higher amount of cadmium was translocated to the grain than in the other 4 varieties, suggesting the existence of genetic variability in cadmium translocation from shoots to grains.
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Claims 13
Claim · model-written summary
NIPPONBARE, KOSHIHIKARI and HU-LO-TAO had the lowest grain cadmium contents among the tested rice cultivars.
- Taxon
- rice
Oryza sativae1 - Material
- NIPPONBARE, KOSHIHIKARI, and HU-LO-TAOe3
- Outcome
- cadmium contentse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e3“NIPPONBARE, KOSHIHIKARI, and HU-LO-TAO belonged to the rice grain group with the lowest cadmium contents”
Claim · model-written summary
The ranking of grain cadmium concentrations was similar between the two years.
- Taxon
- riceOryza sativae1
- Outcome
- ranking of grain cadmium concentrationse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e2“Results of ranking of grain cadmium concentrations were similar between these 2 years”
Claim · model-written summary
KASALATH had a medium grain cadmium content.
- Taxon
- riceOryza sativae1
- Material
- KASALATHe4
- Outcome
- cadmium contente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e4“KASALATH could be categorized as a variety with a medium cadmium content”
Claim · model-written summary
MILYANG23 and PEH-KUH-TSAO-TU had high grain cadmium contents among the tested rice cultivars.
- Taxon
- riceOryza sativae1
- Material
- MILYANG23 and PEH-KUH-TSAO-TUe5
- Outcome
- cadmium contentse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e5“MILYANG23 and PEH-KUH-TSAO-TU as varieties with high cadmium contents”
Claim · model-written summary
The ranking of grain cadmium content in submerged paddy pots was almost the same as in upland pots.
- Taxon
- riceOryza sativae1
- Outcome
- the ranking of the grain cadmium contente6
- Direction
- almost the samee6
- Comparator
- upland condition potse6
- Setting
- submerged pots (paddy conditions)e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e6“the ranking of the grain cadmium content was almost the same as that in the upland condition pots”
e7“were grown in submerged pots (paddy conditions)”
Claim · model-written summary
Paddy rice varieties with low grain cadmium content may be selectable even when grown under upland conditions.
- Taxon
- riceOryza sativae1
- Outcome
- select paddy rice varieties with a low cadmium contente2
- Qualifier
- even when growth occurred under upland conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e2“These results imply that it may be possible to select paddy rice varieties with a low cadmium content even when growth occurred under upland conditions”
Claim · model-written summary
In solution culture, shoot cadmium concentrations of NIPPONBARE and KOSHIHIKARI were not significantly lower than those of MILYANG23 and PEH-KUH-TSAO-TU after 4 d of cadmium addition.
- Taxon
- riceOryza sativae1
- Material
- NIPPONBARE and KOSHIHIKARIe2
- Treatment
- cadmium additione2
- Outcome
- shoot cadmium concentrationse2
- Direction
- not significantly lowere2
- Comparator
- MILYANG23 and PEH-KUH-TSAO-TUe2
- Setting
- solution culturee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e2“The shoot cadmium concentrations in solution culture were not significantly lower in NIPPONBARE and KOSHIHIKARI than those of MILYANG23 and PEH-KUH-TSAO-TU after 4 d of cadmium addition”
Claim · model-written summary
Only PEH-KUH-TSAO-TU had a higher shoot cadmium concentration than the other varieties after 27 d of cadmium addition.
- Taxon
- riceOryza sativae1
- Material
- PEH-KUH-TSAO-TUe2
- Treatment
- 27 d of cadmium additione2
- Outcome
- shoot cadmium concentratione2
- Direction
- highere2
- Comparator
- the other varietiese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e2“Only PEH-KUH-TSAO-TU showed a higher shoot cadmium concentration than the other varieties after 27 d of cadmium addition”
Claim · model-written summary
A screening method using solution culture would not be suitable for detecting genotypes with low grain cadmium content within 1 month.
- Taxon
- riceOryza sativae1
- Outcome
- detecting genotypes with a low cadmium content in graine2
- Value
- within 1 monthe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e2“a screening method using solution culture would not be suitable for detecting genotypes with a low cadmium content in grain within 1 month after cadmium addition”
Claim · model-written summary
The status of available cadmium in soil appears to differ from that in solution culture.
- Taxon
- riceOryza sativae1
- Outcome
- status of available cadmium in soile2
- Direction
- differse2
- Comparator
- that of available cadmium in solution culturee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e2“Our results suggest that the status of available cadmium in soil differs from that of available cadmium in solution culture”
Claim · model-written summary
KASALATH absorbed a relatively high amount of cadmium.
- Taxon
- riceOryza sativae1
- Material
- KASALATHe2
- Outcome
- amount of cadmiume2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e2“KASALATH absorbed a relatively high amount of cadmium, although cadmium distribution to grain in KASALATH was the lowest among the 5 varieties”
Claim · model-written summary
Cadmium distribution to grain in KASALATH was the lowest among the five varieties.
- Taxon
- riceOryza sativae1
- Material
- KASALATHe2
- Outcome
- cadmium distribution to graine2
- Direction
- loweste2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e2“KASALATH absorbed a relatively high amount of cadmium, although cadmium distribution to grain in KASALATH was the lowest among the 5 varieties”
Claim · model-written summary
MILYANG23 translocated a much higher amount of cadmium to the grain than the other four varieties.
- Taxon
- riceOryza sativae1
- Material
- MILYANG23e2
- Outcome
- translocated to the graine2
- Direction
- highere2
- Comparator
- the other 4 varietiese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“49 cultivars of rice were tested under upland conditions”
e2“in MILYANG23, a much higher amount of cadmium was translocated to the grain than in the other 4 varieties”
The same questions in other papers
cadmium atom · nutrient: content · Oryza sativa (rice)Results differ
33 papers in the same direction as this paper · 13 in the opposite direction
- positive
- negative
- negative
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