Abstract
Accurately understanding the critical threshold of leaf magnesium (Mg) concentration is crucial for rapid diagnosis of crop Mg status; however, little information is available on critical Mg concentration for different physiological processes in dicots and monocots. Here, we investigated the sensitivity of biomass, chlorophyll (Chl) at different leaf positions/ages, leaf area (LA), and photosynthesis (Pn) to Mg deficiency between rice (Oryza sativa L.) and cucumber (Cucumis sativus L.). Plants were grown hydroponically under twelve Mg concentration gradients. Results showed reducing the external Mg supply to a certain level resulted in significant decline in biomass, Chl, LA, and Pn in both plants. A leaf Mg threshold of 0.97 mg g−1 DM (dry matter) for total biomass was found in rice, which was not identified in cucumber. Critical Mg thresholds for Chl a, b, and carotenoids (Car) showed a decreasing trend with leaf age, suggesting Chl in upper young leaves are more sensitive to Mg deficiency; however, visible Mg-deficiency symptoms were predominantly in mid-aged leaves with a higher rate of Mg remobilization, especially in cucumber. Leaf critical Mg concentrations for Chl a+b, Pn, and LA were 1.22, 1.05, and 1.00 mg g−1 DM in rice, respectively, which were lower than those of cucumber, 4.23, 4.09, and 3.55 mg g−1 DM, implying that cucumber was more susceptible to low Mg stress; Chl a+b was the most sensitive indicator of Mg deficiency. Overall, Chl a+b of upper young mature leaves can be used as an early diagnostic index of Mg nutrition in crops, especially Mg-insensitive crops.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 18
Claim · model-written summary
Reduced magnesium supply lowered biomass in rice.
- Taxon
- rice
Oryza sativat0 - Treatment
- reducing the external Mg supplye0
- Outcome
- biomasse0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed reducing the external Mg supply to a certain level resulted in significant decline in biomass, Chl, LA, and Pn in both plants.”
t0“rice”
Claim · model-written summary
Reduced magnesium supply lowered Chl in rice.
- Taxon
- riceOryza sativat0
- Treatment
- reducing the external Mg supplye0
- Outcome
- Chle0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed reducing the external Mg supply to a certain level resulted in significant decline in biomass, Chl, LA, and Pn in both plants.”
t0“rice”
Claim · model-written summary
Reduced magnesium supply lowered LA in rice.
- Taxon
- riceOryza sativat0
- Treatment
- reducing the external Mg supplye0
- Outcome
- LAe0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed reducing the external Mg supply to a certain level resulted in significant decline in biomass, Chl, LA, and Pn in both plants.”
t0“rice”
Claim · model-written summary
Reduced magnesium supply lowered Pn in rice.
- Taxon
- riceOryza sativat0
- Treatment
- reducing the external Mg supplye0
- Outcome
- Pne0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed reducing the external Mg supply to a certain level resulted in significant decline in biomass, Chl, LA, and Pn in both plants.”
t0“rice”
Claim · model-written summary
Reduced magnesium supply lowered biomass in cucumber.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- reducing the external Mg supplye0
- Outcome
- biomasse0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed reducing the external Mg supply to a certain level resulted in significant decline in biomass, Chl, LA, and Pn in both plants.”
t0“cucumber”
Claim · model-written summary
Reduced magnesium supply lowered Chl in cucumber.
- Taxon
- cucumberCucumis sativust0
- Treatment
- reducing the external Mg supplye0
- Outcome
- Chle0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed reducing the external Mg supply to a certain level resulted in significant decline in biomass, Chl, LA, and Pn in both plants.”
t0“cucumber”
Claim · model-written summary
Reduced magnesium supply lowered LA in cucumber.
- Taxon
- cucumberCucumis sativust0
- Treatment
- reducing the external Mg supplye0
- Outcome
- LAe0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed reducing the external Mg supply to a certain level resulted in significant decline in biomass, Chl, LA, and Pn in both plants.”
t0“cucumber”
Claim · model-written summary
Reduced magnesium supply lowered Pn in cucumber.
- Taxon
- cucumberCucumis sativust0
- Treatment
- reducing the external Mg supplye0
- Outcome
- Pne0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed reducing the external Mg supply to a certain level resulted in significant decline in biomass, Chl, LA, and Pn in both plants.”
t0“cucumber”
Claim · model-written summary
Rice total biomass had a leaf magnesium threshold of 0.97 mg g−1 DM.
- Taxon
- riceOryza sativae0
- Outcome
- leaf Mg thresholde0
- Value
- 0.97 mg g−1 DMe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A leaf Mg threshold of 0.97 mg g−1 DM (dry matter) for total biomass was found in rice, which was not identified in cucumber.”
Claim · model-written summary
Critical Mg thresholds for pigments decreased with leaf age.
- Taxon
- riceOryza sativat0
- Organ / stage
- leaf agee0
- Outcome
- Critical Mg thresholds for Chl a, b, and carotenoids (Car)e0
- Direction
- decreasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Critical Mg thresholds for Chl a, b, and carotenoids (Car) showed a decreasing trend with leaf age, suggesting Chl in upper young leaves are more sensitive to Mg deficiency; however, visible Mg-deficiency symptoms were predominantly in mid-aged leaves with a higher rate of Mg remobilization, especially in cucumber.”
t0“Rice”
Claim · model-written summary
Visible magnesium deficiency symptoms occurred predominantly in mid-aged cucumber leaves.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- visible Mg-deficiency symptoms were predominantly in mid-aged leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Critical Mg thresholds for Chl a, b, and carotenoids (Car) showed a decreasing trend with leaf age, suggesting Chl in upper young leaves are more sensitive to Mg deficiency; however, visible Mg-deficiency symptoms were predominantly in mid-aged leaves with a higher rate of Mg remobilization, especially in cucumber.”
Claim · model-written summary
rice leaf critical Mg concentration for Chl a+b was 1.22 mg g−1 DM.
- Taxon
- riceOryza sativae0
- Outcome
- Leaf critical Mg concentrations for Chl a+b, Pn, and LAe0
- Value
- 1.22e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf critical Mg concentrations for Chl a+b, Pn, and LA were 1.22, 1.05, and 1.00 mg g−1 DM in rice, respectively, which were lower than those of cucumber, 4.23, 4.09, and 3.55 mg g−1 DM, implying that cucumber was more susceptible to low Mg stress; Chl a+b was the most sensitive indicator of Mg deficiency.”
Claim · model-written summary
rice leaf critical Mg concentration for Pn was 1.05 mg g−1 DM.
- Taxon
- riceOryza sativae0
- Outcome
- Leaf critical Mg concentrations for Chl a+b, Pn, and LAe0
- Value
- 1.05e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf critical Mg concentrations for Chl a+b, Pn, and LA were 1.22, 1.05, and 1.00 mg g−1 DM in rice, respectively, which were lower than those of cucumber, 4.23, 4.09, and 3.55 mg g−1 DM, implying that cucumber was more susceptible to low Mg stress; Chl a+b was the most sensitive indicator of Mg deficiency.”
Claim · model-written summary
rice leaf critical Mg concentration for LA was 1.00 mg g−1 DM.
- Taxon
- riceOryza sativae0
- Outcome
- Leaf critical Mg concentrations for Chl a+b, Pn, and LAe0
- Value
- 1.00e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf critical Mg concentrations for Chl a+b, Pn, and LA were 1.22, 1.05, and 1.00 mg g−1 DM in rice, respectively, which were lower than those of cucumber, 4.23, 4.09, and 3.55 mg g−1 DM, implying that cucumber was more susceptible to low Mg stress; Chl a+b was the most sensitive indicator of Mg deficiency.”
Claim · model-written summary
cucumber leaf critical Mg concentration for Chl a+b was 4.23 mg g−1 DM.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- Leaf critical Mg concentrations for Chl a+b, Pn, and LAe0
- Value
- 4.23e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf critical Mg concentrations for Chl a+b, Pn, and LA were 1.22, 1.05, and 1.00 mg g−1 DM in rice, respectively, which were lower than those of cucumber, 4.23, 4.09, and 3.55 mg g−1 DM, implying that cucumber was more susceptible to low Mg stress; Chl a+b was the most sensitive indicator of Mg deficiency.”
Claim · model-written summary
cucumber leaf critical Mg concentration for Pn was 4.09 mg g−1 DM.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- Leaf critical Mg concentrations for Chl a+b, Pn, and LAe0
- Value
- 4.09e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf critical Mg concentrations for Chl a+b, Pn, and LA were 1.22, 1.05, and 1.00 mg g−1 DM in rice, respectively, which were lower than those of cucumber, 4.23, 4.09, and 3.55 mg g−1 DM, implying that cucumber was more susceptible to low Mg stress; Chl a+b was the most sensitive indicator of Mg deficiency.”
Claim · model-written summary
cucumber leaf critical Mg concentration for LA was 3.55 mg g−1 DM.
- Taxon
- cucumberCucumis sativuse0
- Outcome
- Leaf critical Mg concentrations for Chl a+b, Pn, and LAe0
- Value
- 3.55e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf critical Mg concentrations for Chl a+b, Pn, and LA were 1.22, 1.05, and 1.00 mg g−1 DM in rice, respectively, which were lower than those of cucumber, 4.23, 4.09, and 3.55 mg g−1 DM, implying that cucumber was more susceptible to low Mg stress; Chl a+b was the most sensitive indicator of Mg deficiency.”
Claim · model-written summary
Chl a+b was the most sensitive indicator of Mg deficiency.
- Taxon
- riceOryza sativae0
- Outcome
- Chl a+b was the most sensitive indicator of Mg deficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf critical Mg concentrations for Chl a+b, Pn, and LA were 1.22, 1.05, and 1.00 mg g−1 DM in rice, respectively, which were lower than those of cucumber, 4.23, 4.09, and 3.55 mg g−1 DM, implying that cucumber was more susceptible to low Mg stress; Chl a+b was the most sensitive indicator of Mg deficiency.”
The same questions in other papers
magnesium atom · growth · Oryza sativa (rice)Results differ
4 papers in the same direction as this paper · 11 in the opposite direction
- positive
- positive
- positive
12 papers more in this group
See all 16 papers →magnesium atom · growth · Cucumis sativus (cucumber)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
2 papers more in this group
See all 6 papers →magnesium atom · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →magnesium atom · physiology: photosynthesis · Cucumis sativus (cucumber)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
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.