Abstract
Abstract Three rice cultivars, IR712, M1–48 and E425 were grown in solution culture for 10 weeks in temperature controlled glasshouses at IRRI, Los Baños, Philippines. Treatments consisted of two Mn levels, 0.5 and 50 μg.cm‐3 and two temperature regimes, 35/27 and 20/20 (day/night) in °C. Dry matter and Mn concentrations were determined at 2‐week intervals. In a second experiment, the M1–48 cultivar was grown in solutions containing 0.5, 1, 40 and 80 μg.cm‐3 Mn at 35/27, 29/21 and 20/20 °C (day/night) temperatures. It was concluded that rice is more sensitive to excess Mn under cool conditions and that the concentration of Mn in the tissue at which toxicity symptoms appear or growth is decreased depends on the age of the tissues and the environmental conditions under which the plant is growing. Growth of two‐day old seedlings exposed to excess Mn was decreased to a greater degree than was that of 2‐week old seedlings. It is suggested that in screening rice cultivars for tolerance to excess Mn the environmental conditions should be rather rigidly controlled.
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Claims 4
Claim · model-written summary
Rice was more sensitive to excess Mn in cool conditions.
- Taxon
- rice
Oryza sativae0 - Treatment
- excess Mn under cool conditionse0
- Outcome
- sensitive to excess Mne0
- Direction
- more sensitivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice is more sensitive to excess Mn under cool conditions”
Claim · model-written summary
The tissue Mn concentration at which toxicity or reduced growth appears depends on tissue age and growing conditions.
- Taxon
- riceOryza sativat0
- Organ / stage
- age of the tissuese0
- Outcome
- concentration of Mn in the tissue at which toxicity symptoms appear or growth is decreasede0
- Qualifier
- environmental conditionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of Mn in the tissue at which toxicity symptoms appear or growth is decreased depends on the age of the tissues and the environmental conditions under which the plant is growing”
t0“rice”
Claim · model-written summary
Excess Mn decreased growth more in two-day-old seedlings than in two-week-old seedlings.
- Taxon
- riceOryza sativat0
- Organ / stage
- two‐day old seedlingse0
- Treatment
- excess Mne0
- Outcome
- Growth of two‐day old seedlingse0
- Direction
- decreasede0
- Comparator
- 2‐week old seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth of two‐day old seedlings exposed to excess Mn was decreased to a greater degree than was that of 2‐week old seedlings.”
t0“rice”
Claim · model-written summary
The authors suggest tightly controlling environmental conditions when screening rice cultivars for excess Mn tolerance.
- Taxon
- riceOryza sativae0
- Outcome
- environmental conditions should be rather rigidly controllede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in screening rice cultivars for tolerance to excess Mn the environmental conditions should be rather rigidly controlled”
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