Abstract
Abstract Salinity is one of the major abiotic challenges influencing plant productivity worldwide. To examine the response of two alfalfa cultivars (Bami and Hamedani) to six levels of water salinity (0, 25, 50, 75, 100, 125 mM L-1 NaCl), a glasshouse experiment was conducted at the College of Agriculture, Shiraz University, Shiraz, Iran in 2008. The results showed that in Bami (which appeared to be more tolerant to salinity), with increasing salt stress from 75 to 125 mM L-1, dry weight per pot was significantly decreased from 15.1 to 10.3 g, while in Hamedani decrease in dry weight was started from 50 mM L-1 salinity level. In both Bami and Hamedani cultivars leaf area per pot was significantly decreased when salt stress was higher than 75 mM L-1. There was a significant difference in leaf relative water content (RWC) between the two alfalfa cultivars in 75, 100 and 125 mM L-1 NaCl salinity levels. With increase in salinity level, the Na+ concentration was increased from 220 to 565 mmol kg-1 dry weight in Bami, and from 238 to 643 mmol kg-1 dry weight in Hamedani. The Cl- concentration in Hamedani (622 mmol kg-1 dry weight in 125 mM L-1 NaCl) was higher than that in Bami (503 mmol kg-1 dry weight in 125 mM L-1 NaCl). The K+ concentration was increased from 203 to 604 mmol kg-1 dry weight in Bami, and from 135 to 571 mmol kg-1 dry weight in Hamedani. Furthermore, phytomass production in Bami was significantly correlated with K+ (r=0.97), and Ca2+ (r=0.96) concentrations, as well as with leaf area (r=0.50) and plant height (r=0.87). Path analysis showed that there were significant direct effects of leaf area (p=0.73), Ca2+ (p=1.02) and K+ (p=0.59) on dry weight in Bami. In Hamedani, there were significant direct effects of K+ (p=0.61) and Ca2+ (p=1.07 on dry weight. Overall, based on both correlation and path analyses, it was concluded that measurements of K+ and Ca2+ concentrations may be appropriate criteria for evaluating susceptibility of cultivars to salt stress. These results may also be used for screening the salt resistant cultivars of alfalfa.
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Claims 20
Claim · model-written summary
Bami appeared more tolerant to salinity.
- Taxon
- alfalfa
Medicago sativat0 - Material
- Bamie0
- Outcome
- more tolerant to salinitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bami (which appeared to be more tolerant to salinity)”
t0“Alfalfa”
Claim · model-written summary
Bami dry weight fell from 15.1 to 10.3 g as salt stress rose from 75 to 125 mM L-1.
- Taxon
- alfalfaMedicago sativat0
- Material
- Bamie0
- Treatment
- salt stress from 75 to 125 mM L-1e0
- Outcome
- dry weight per pote0
- Direction
- decreasede0
- Value
- 15.1 to 10.3 ge0
- Comparator
- 75e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Bami (which appeared to be more tolerant to salinity), with increasing salt stress from 75 to 125 mM L-1, dry weight per pot was significantly decreased from 15.1 to 10.3 g”
t0“Alfalfa”
Claim · model-written summary
Hamedani dry weight started decreasing at 50 mM L-1 salinity.
- Taxon
- alfalfaMedicago sativat0
- Material
- Hamedanie0
- Treatment
- 50 mM L-1 salinity levele0
- Outcome
- dry weighte0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Hamedani decrease in dry weight was started from 50 mM L-1 salinity level”
t0“Alfalfa”
Claim · model-written summary
Leaf area per pot decreased significantly in Bami above 75 mM L-1 salt stress.
- Taxon
- alfalfaMedicago sativat0
- Material
- Bamie0
- Treatment
- salt stress was higher than 75 mM L-1e0
- Outcome
- leaf area per pote0
- Direction
- decreasede0
- Comparator
- 75 mM L-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both Bami and Hamedani cultivars leaf area per pot was significantly decreased when salt stress was higher than 75 mM L-1”
t0“Alfalfa”
Claim · model-written summary
Leaf area per pot decreased significantly in Hamedani above 75 mM L-1 salt stress.
- Taxon
- alfalfaMedicago sativat0
- Material
- Hamedanie0
- Treatment
- salt stress was higher than 75 mM L-1e0
- Outcome
- leaf area per pote0
- Direction
- decreasede0
- Comparator
- 75 mM L-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both Bami and Hamedani cultivars leaf area per pot was significantly decreased when salt stress was higher than 75 mM L-1”
t0“Alfalfa”
Claim · model-written summary
Leaf relative water content differed significantly between the two cultivars at 75, 100 and 125 mM L-1 NaCl.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- leaf relative water content (RWC)e0
- Qualifier
- 75, 100 and 125 mM L-1 NaCl salinity levelse0
- Comparator
- two alfalfa cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a significant difference in leaf relative water content (RWC) between the two alfalfa cultivars in 75, 100 and 125 mM L-1 NaCl salinity levels”
Claim · model-written summary
Bami Na+ concentration rose from 220 to 565 mmol kg-1 dry weight with salinity.
- Taxon
- alfalfaMedicago sativat0
- Material
- Bamie0
- Outcome
- Na+ concentratione0
- Direction
- increasede0
- Value
- 220 to 565 mmol kg-1 dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increase in salinity level, the Na+ concentration was increased from 220 to 565 mmol kg-1 dry weight in Bami”
t0“Alfalfa”
Claim · model-written summary
Hamedani Na+ concentration rose from 238 to 643 mmol kg-1 dry weight with salinity.
- Taxon
- alfalfaMedicago sativat0
- Material
- Hamedanie0
- Outcome
- Na+ concentratione0
- Value
- 238 to 643 mmol kg-1 dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increase in salinity level, the Na+ concentration was increased from 220 to 565 mmol kg-1 dry weight in Bami, and from 238 to 643 mmol kg-1 dry weight in Hamedani”
t0“Alfalfa”
Claim · model-written summary
Hamedani Cl- concentration was higher than Bami at 125 mM L-1 NaCl.
- Taxon
- alfalfaMedicago sativat0
- Material
- Hamedanie0
- Outcome
- Cl- concentratione0
- Direction
- highere0
- Value
- 622 mmol kg-1 dry weighte0
- Qualifier
- 503 mmol kg-1 dry weighte0
- Comparator
- Bamie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cl- concentration in Hamedani (622 mmol kg-1 dry weight in 125 mM L-1 NaCl) was higher than that in Bami (503 mmol kg-1 dry weight in 125 mM L-1 NaCl)”
t0“Alfalfa”
Claim · model-written summary
Bami K+ concentration increased from 203 to 604 mmol kg-1 dry weight.
- Taxon
- alfalfaMedicago sativat0
- Material
- Bamie0
- Outcome
- K+ concentratione0
- Direction
- increasede0
- Value
- 203 to 604 mmol kg-1 dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The K+ concentration was increased from 203 to 604 mmol kg-1 dry weight in Bami”
t0“Alfalfa”
Claim · model-written summary
Hamedani K+ concentration increased from 135 to 571 mmol kg-1 dry weight.
- Taxon
- alfalfaMedicago sativat0
- Material
- Hamedanie0
- Outcome
- K+ concentratione0
- Value
- 135 to 571 mmol kg-1 dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The K+ concentration was increased from 203 to 604 mmol kg-1 dry weight in Bami, and from 135 to 571 mmol kg-1 dry weight in Hamedani”
t0“Alfalfa”
Claim · model-written summary
Bami phytomass was significantly correlated with K+ concentration (r=0.97).
- Taxon
- alfalfaMedicago sativat0
- Material
- Bamie0
- Compound
- K+e0
- Outcome
- phytomass productione0
- Direction
- correlatede0
- Value
- r=0.97e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phytomass production in Bami was significantly correlated with K+ (r=0.97)”
t0“Alfalfa”
Claim · model-written summary
Bami phytomass was significantly correlated with Ca2+ concentration (r=0.96).
- Taxon
- alfalfaMedicago sativat0
- Material
- Bamie0
- Compound
- Ca2+e0
- Outcome
- phytomass productione0
- Direction
- correlatede0
- Value
- r=0.96e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phytomass production in Bami was significantly correlated with K+ (r=0.97), and Ca2+ (r=0.96) concentrations”
t0“Alfalfa”
Claim · model-written summary
Bami phytomass was significantly correlated with leaf area (r=0.50).
- Taxon
- alfalfaMedicago sativat0
- Material
- Bamie0
- Organ / stage
- leafe0
- Outcome
- phytomass productione0
- Direction
- correlatede0
- Value
- r=0.50e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phytomass production in Bami was significantly correlated with K+ (r=0.97), and Ca2+ (r=0.96) concentrations, as well as with leaf area (r=0.50)”
t0“Alfalfa”
Claim · model-written summary
Bami phytomass was significantly correlated with plant height (r=0.87).
- Taxon
- alfalfaMedicago sativat0
- Material
- Bamie0
- Organ / stage
- plant heighte0
- Outcome
- phytomass productione0
- Direction
- correlatede0
- Value
- r=0.87e0
- Qualifier
- plant heighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phytomass production in Bami was significantly correlated with K+ (r=0.97), and Ca2+ (r=0.96) concentrations, as well as with leaf area (r=0.50) and plant height (r=0.87)”
t0“Alfalfa”
Claim · model-written summary
Leaf area had a significant direct effect on Bami dry weight (p=0.73).
- Taxon
- alfalfaMedicago sativat0
- Material
- Bamie0
- Organ / stage
- leafe0
- Outcome
- dry weighte0
- Direction
- direct effectse0
- Value
- p=0.73e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant direct effects of leaf area (p=0.73), Ca2+ (p=1.02) and K+ (p=0.59) on dry weight in Bami”
t0“Alfalfa”
Claim · model-written summary
Ca2+ had a significant direct effect on Bami dry weight (p=1.02).
- Taxon
- alfalfaMedicago sativat0
- Material
- Bamie0
- Compound
- Ca2+e0
- Outcome
- dry weighte0
- Direction
- direct effectse0
- Value
- p=1.02e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant direct effects of leaf area (p=0.73), Ca2+ (p=1.02) and K+ (p=0.59) on dry weight in Bami”
t0“Alfalfa”
Claim · model-written summary
K+ had a significant direct effect on Bami dry weight (p=0.59).
- Taxon
- alfalfaMedicago sativat0
- Material
- Bamie0
- Compound
- K+e0
- Outcome
- dry weighte0
- Direction
- direct effectse0
- Value
- p=0.59e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant direct effects of leaf area (p=0.73), Ca2+ (p=1.02) and K+ (p=0.59) on dry weight in Bami”
t0“Alfalfa”
Claim · model-written summary
K+ had a significant direct effect on Hamedani dry weight (p=0.61).
- Taxon
- alfalfaMedicago sativat0
- Material
- Hamedanie0
- Compound
- K+e0
- Outcome
- dry weighte0
- Direction
- direct effectse0
- Value
- p=0.61e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Hamedani, there were significant direct effects of K+ (p=0.61) and Ca2+ (p=1.07 on dry weight”
t0“Alfalfa”
Claim · model-written summary
Ca2+ had a significant direct effect on Hamedani dry weight (p=1.07).
- Taxon
- alfalfaMedicago sativat0
- Material
- Hamedanie0
- Compound
- Ca2+e0
- Outcome
- dry weighte0
- Direction
- direct effectse0
- Value
- p=1.07e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Hamedani, there were significant direct effects of K+ (p=0.61) and Ca2+ (p=1.07 on dry weight”
t0“Alfalfa”
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salinity · growth · Medicago sativa (alfalfa)Positive and negative results
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