Abstract
To study how melatonin (MT) treatment of plants used for stubble affects the heavy metal accumulation of the subsequent crop, the effects of MT-treated Nasturtium officinale on the growth and cadmium (Cd) accumulation of subsequently grown rice seedlings were investigated in a pot experiment. Stubble from N. officinale treated with low concentrations (25 and 50 µmol kg−1) of MT increased the shoot biomass of rice seedlings, whereas other concentrations (100, 150, and 200 µmol kg−1) caused a decrease or had no significant effect. Nasturtium officinale stubble from plants treated with different MT concentrations also affected the rice-seedling contents of photosynthetic pigments (chlorophyll a, chlorophyll b, total chlorophyll, and carotenoids) and reduced the activities of antioxidant enzymes (superoxide dismutase, peroxidase, and catalase). Prior treatment of N. officinale with MT (>25 µmol kg−1) decreased the shoot Cd content and translocation factor of subsequently grown rice seedlings. To some extent, the application of a low concentration (25 and 50 µmol kg−1) of MT to N. officinale sown before rice can therefore promote growth and inhibit Cd transport from roots to shoots of rice seedlings, with 25 µmol kg−1 found to be the optimal concentration.
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Claims 8
Claim · model-written summary
Stubble from melatonin-treated N. officinale at 25 and 50 µmol kg−1 increased rice seedling shoot biomass.
- Taxon
- rice seedlings
Oryza sativae1 - Treatment
- low concentrations (25 and 50 µmol kg−1) of MTe1
- Outcome
- shoot biomasse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Stubble from N. officinale treated with low concentrations (25 and 50 µmol kg−1) of MT increased the shoot biomass of rice seedlings”
Claim · model-written summary
Stubble from N. officinale treated with 100, 150 or 200 µmol kg−1 MT decreased rice seedling shoot biomass.
- Taxon
- rice seedlingsOryza sativae1
- Treatment
- 100, 150, and 200 µmol kg−1e2
- Outcome
- shoot biomasse1
- Direction
- decreasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Stubble from N. officinale treated with low concentrations (25 and 50 µmol kg−1) of MT increased the shoot biomass of rice seedlings”
e2“whereas other concentrations (100, 150, and 200 µmol kg−1) caused a decrease or had no significant effect”
Claim · model-written summary
Stubble from N. officinale treated with 100, 150 or 200 µmol kg−1 MT had no significant effect on rice seedling shoot biomass.
- Taxon
- rice seedlingsOryza sativae1
- Treatment
- 100, 150, and 200 µmol kg−1e2
- Outcome
- shoot biomasse1
- Direction
- no significant effecte2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Stubble from N. officinale treated with low concentrations (25 and 50 µmol kg−1) of MT increased the shoot biomass of rice seedlings”
e2“whereas other concentrations (100, 150, and 200 µmol kg−1) caused a decrease or had no significant effect”
Claim · model-written summary
Melatonin-treated N. officinale stubble affected rice seedling photosynthetic pigment contents; direction not stated.
- Taxon
- riceOryza sativae3
- Treatment
- stubble from plants treated with different MT concentrationse3
- Outcome
- contents of photosynthetic pigmentse3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Nasturtium officinale stubble from plants treated with different MT concentrations also affected the rice-seedling contents of photosynthetic pigments (chlorophyll a, chlorophyll b, total chlorophyll, and carotenoids)”
Claim · model-written summary
Melatonin-treated N. officinale stubble reduced antioxidant enzyme activities in rice seedlings.
- Taxon
- riceOryza sativae3
- Treatment
- stubble from plants treated with different MT concentrationse3
- Outcome
- activities of antioxidant enzymese4
- Direction
- reducede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Nasturtium officinale stubble from plants treated with different MT concentrations also affected the rice-seedling contents of photosynthetic pigments (chlorophyll a, chlorophyll b, total chlorophyll, and carotenoids)”
e4“reduced the activities of antioxidant enzymes (superoxide dismutase, peroxidase, and catalase)”
Claim · model-written summary
Prior melatonin treatment of N. officinale above 25 µmol kg−1 decreased shoot Cd content and translocation factor of rice seedlings.
- Taxon
- rice seedlingsOryza sativae5
- Treatment
- treatment of N. officinale with MT (>25 µmol kg−1)e5
- Outcome
- shoot Cd content and translocation factore5
- Direction
- decreasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Prior treatment of N. officinale with MT (>25 µmol kg−1) decreased the shoot Cd content and translocation factor of subsequently grown rice seedlings”
Claim · model-written summary
Low-concentration melatonin application to N. officinale sown before rice can promote growth and inhibit Cd transport to rice shoots.
- Taxon
- riceOryza sativae6
- Treatment
- a low concentration (25 and 50 µmol kg−1) of MTe6
- Outcome
- promote growth and inhibit Cd transport from roots to shootse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“the application of a low concentration (25 and 50 µmol kg−1) of MT to N. officinale sown before rice can therefore promote growth and inhibit Cd transport from roots to shoots of rice seedlings”
Claim · model-written summary
The optimal melatonin concentration for the N. officinale stubble treatment is 25 µmol kg−1.
- Taxon
- riceOryza sativae6
- Outcome
- optimal concentratione7
- Value
- 25 µmol kg−1e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“the application of a low concentration (25 and 50 µmol kg−1) of MT to N. officinale sown before rice can therefore promote growth and inhibit Cd transport from roots to shoots of rice seedlings”
e7“with 25 µmol kg−1 found to be the optimal concentration”
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See all 28 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.