Abstract
The study aims to investigate the physiological mechanisms associated with salt tolerance of different rice genotypes; with emphasis on carbohydrate metabolism and chlorophyll concentration. Studies were conducted in a greenhouse and fields at the International Rice Research Institute (IRRI) during the dry season (November 2008 to March 2009) and the wet season (April 2009 to October 2010). Salt stress increased chlorophyll concentration in leaves of a tolerant (IR651) and a moderately tolerant (IR64) rice genotypes, but significantly decreased chlorophyll a/b ratio. Chlorophyll a concentration and chlorophyll a/bratio were higher in the leaves of IR651 than in the leaves of IR64 under salt stress, and this is probably one of the reasons for the higher tolerance of IR651 compared with IR64. Differences between genotypes in dry weight and leaf area were not significant under control condition; however, higher soluble sugars and starch concentrations in plant tissues were observed under control conditions than under salt stress. Conversion of soluble sugars into starch seems to be partially inhibited by salt stress as suggested by the higher concentrations of soluble sugars compared with starch under salt stress. Apparently, the salt tolerant genotype maintained higher soluble sugars, higher chlorophyll a and chlorophyll a/b ratio under salt stress, and these traits could have partially contributed to its salt tolerance. Key words: Carbohydrate metabolism, chlorophyll concentration, rice, salt stress, salt tolerance.
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Claims 9
Claim · model-written summary
Salt stress increased leaf chlorophyll concentration in IR651.
- Taxon
- rice
Oryza sativae0 - Material
- IR651e0
- Treatment
- Salt stresse0
- Outcome
- chlorophyll concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress increased chlorophyll concentration in leaves of a tolerant (IR651) and a moderately tolerant (IR64) rice genotypes”
Claim · model-written summary
Salt stress increased leaf chlorophyll concentration in IR64.
- Taxon
- riceOryza sativae0
- Material
- IR64e0
- Treatment
- Salt stresse0
- Outcome
- chlorophyll concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress increased chlorophyll concentration in leaves of a tolerant (IR651) and a moderately tolerant (IR64) rice genotypes”
Claim · model-written summary
Salt stress significantly decreased the chlorophyll a/b ratio.
- Taxon
- riceOryza sativat0
- Treatment
- Salt stresse1
- Outcome
- chlorophyll a/b ratioe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but significantly decreased chlorophyll a/b ratio.”
t0“rice”
e1“Salt stress increased chlorophyll concentration in leaves of a tolerant (IR651) and a moderately tolerant (IR64) rice genotypes”
Claim · model-written summary
Under salt stress, IR651 had higher chlorophyll a than IR64.
- Taxon
- riceOryza sativat0
- Material
- IR651e0
- Outcome
- Chlorophyll a concentratione0
- Direction
- highere0
- Qualifier
- under salt stresse0
- Comparator
- IR64e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll a concentration and chlorophyll a/bratio were higher in the leaves of IR651 than in the leaves of IR64 under salt stress”
t0“rice”
Claim · model-written summary
Under salt stress, IR651 had a higher chlorophyll a/b ratio than IR64.
- Taxon
- riceOryza sativat0
- Material
- IR651e0
- Outcome
- chlorophyll a/bratioe0
- Direction
- highere0
- Qualifier
- under salt stresse0
- Comparator
- IR64e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll a concentration and chlorophyll a/bratio were higher in the leaves of IR651 than in the leaves of IR64 under salt stress”
t0“rice”
Claim · model-written summary
Genotypes did not significantly differ in dry weight or leaf area under control conditions.
- Taxon
- riceOryza sativat0
- Outcome
- dry weight and leaf areae0
- Qualifier
- under control conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences between genotypes in dry weight and leaf area were not significant under control condition”
t0“rice”
Claim · model-written summary
Soluble sugar concentration was higher in control plants than under salt stress.
- Taxon
- riceOryza sativat0
- Treatment
- salt stresse0
- Outcome
- soluble sugarse0
- Direction
- lowerinferrede0
- Comparator
- control conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher soluble sugars and starch concentrations in plant tissues were observed under control conditions than under salt stress.”
t0“rice”
Claim · model-written summary
Starch concentration was higher in control plants than under salt stress.
- Taxon
- riceOryza sativat0
- Treatment
- salt stresse0
- Outcome
- starch concentrationse0
- Direction
- lowerinferrede0
- Comparator
- control conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher soluble sugars and starch concentrations in plant tissues were observed under control conditions than under salt stress.”
t0“rice”
Claim · model-written summary
Salt stress apparently partially inhibited conversion of soluble sugars to starch.
- Taxon
- riceOryza sativat0
- Treatment
- salt stresse0
- Outcome
- Conversion of soluble sugars into starche0
- Direction
- inhibitede0
- Qualifier
- seems to be partially inhibitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conversion of soluble sugars into starch seems to be partially inhibited by salt stress as suggested by the higher concentrations of soluble sugars compared with starch under salt stress.”
t0“rice”
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