Abstract
Alfalfa is an important salt-tolerant leguminous forage-plant in salinity areas worldwide, but its performance in high level of salt stress cannot meet the satisfactory requirement. Especially, the short-term response of alfalfa to high-level salt stress is still not clear. In the present study, thirty-day-old alfalfa Gongnong No. 1 (Medicago sativa L. cv. Gongnong No.1) seedlings were exposed to NaCl treatments at concentrations of 0 (control), 50 (moderate level), 150 (high level), and 250 mM (extremely high level). Twenty-four hours after salt stress treatment, with the increase of NaCl level plant height was slightly decreased but both shoot biomass and root length were substantially declined to a dramatic extent. Also decreased was root K concentration. In contrast, both Na concentration and ratio of K/Na showed increased trends. Root K flux was determined using non-invasive micro-test technique (NMT) around apical root tips, wherein a clear K influx was observed at the rate of about 0.5 nmol cm s under the condition without salt stress, while under salt stress at the rate of 2‒3 nmol cm s did occur K efflux. Accordingly, stomatal length and breadth and stomatal aperture breadth decreased with the increase of NaCl concentration, while stomatal aperture density increased with time in the first 24 h after NaCl treatment. In conclusion, as a species-specific test, alfalfa is sensitive to high-level salinity with NaCl concentrations above 150 mM in the first 24 h post salt-exposure. The key mechanism was found to be presented as the pressed stamatal conductance induced by K-Na unbalance which was caused by root K efflux. © 2016 Friends Science Publishers
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. 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 9
Claim · model-written summary
Plant height decreased slightly as NaCl increased.
- Taxon
- Alfalfa
Medicago sativat0 - Treatment
- NaCle0
- Outcome
- plant heighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with the increase of NaCl level plant height was slightly decreased”
t0“Alfalfa”
Claim · model-written summary
Shoot biomass and root length declined substantially as NaCl increased.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- NaCle0
- Outcome
- shoot biomass and root lengthe0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with the increase of NaCl level plant height was slightly decreased but both shoot biomass and root length were substantially declined to a dramatic extent”
t0“Alfalfa”
Claim · model-written summary
Root K concentration decreased under increasing NaCl.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- salt stresse1
- Outcome
- root K concentratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Also decreased was root K concentration.”
e1“a clear K influx was observed at the rate of about 0.5 nmol cm s under the condition without salt stress, while under salt stress at the rate of 2‒3 nmol cm s did occur K efflux”
t0“Alfalfa”
Claim · model-written summary
Na concentration and the K/Na ratio increased.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- NaCle1
- Outcome
- Na concentration and ratio of K/Nae0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both Na concentration and ratio of K/Na showed increased trends”
e1“with the increase of NaCl level plant height was slightly decreased”
t0“Alfalfa”
Claim · model-written summary
Root K influx without salt stress shifted to K efflux under salt stress.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- salt stresse0
- Outcome
- K effluxe0
- Value
- 2‒3 nmol cm se0
- Qualifier
- 0.5 nmol cm se0
- Comparator
- without salt stresse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a clear K influx was observed at the rate of about 0.5 nmol cm s under the condition without salt stress, while under salt stress at the rate of 2‒3 nmol cm s did occur K efflux”
t0“Alfalfa”
Claim · model-written summary
Stomatal length, breadth, and aperture breadth decreased as NaCl increased.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- NaCle0
- Outcome
- stomatal length and breadth and stomatal aperture breadthe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal length and breadth and stomatal aperture breadth decreased with the increase of NaCl concentration”
t0“Alfalfa”
Claim · model-written summary
Stomatal aperture density increased during the first 24 hours after NaCl treatment.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- NaCl treatmente0
- Outcome
- stomatal aperture densitye0
- Direction
- increasede0
- Qualifier
- first 24 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal aperture density increased with time in the first 24 h after NaCl treatment”
t0“Alfalfa”
Claim · model-written summary
The authors conclude that alfalfa is sensitive above 150 mM NaCl in the first 24 hours.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- sensitive to high-level salinitye0
- Qualifier
- NaCl concentrations above 150 mM in the first 24 h post salt-exposuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa is sensitive to high-level salinity with NaCl concentrations above 150 mM in the first 24 h post salt-exposure”
Claim · model-written summary
The authors attribute pressed stomatal conductance to K-Na imbalance caused by root K efflux.
- Taxon
- AlfalfaMedicago sativat0
- Outcome
- pressed stamatal conductancee0
- Qualifier
- K-Na unbalance which was caused by root K effluxe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pressed stamatal conductance induced by K-Na unbalance which was caused by root K efflux”
t0“Alfalfa”
The same questions in other papers
sodium chloride · growth · Medicago sativa (alfalfa)Results differ
38 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
39 papers more in this group
See all 43 papers →sodium chloride · physiology: gas exchange · Medicago sativa (alfalfa)Results agree
1 paper in the same direction as this paper
- negative
salinity · nutrient: content · Medicago sativa (alfalfa)Positive and negative results
9 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
7 papers more in this group
See all 11 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.