Abstract
This work focused on the effects of aluminum (Al) stress on photosynthetic apparatus using Al-tolerant and sensitive cultivars of sorghum (Sorghum bicolor (L.) Moench). Plants were grown in Clark's nutrient solution aerated continuously and adjusted daily to pH 4.0 and containing two Al concentrations (0 and 185 mmol m−3) supplied as Al2(SO4)3ċ18H2O. Measurements were performed on recently expanded leaves from the eighth to sixteenth day after imposing Al treatments. In general, chloroplastidic" pigment concentration, chlorophyll fluorescence parameters, and photosynthetic rates were initially affected by Al stress to a greater extent in the Al-tolerant cultivar than in the susceptible cultivar. However, the Al-tolerant genotype seemed to cope with high Al via progressive, sustained decreases in initial chlorophyll fluorescence and increases in chlorophyll a/b ratio, photosystem II photochemical efficiency, net carbon assimilation rate, and photosynthetic oxygen evolution. In contrast, the Al-sensitive cultivar did not show any apparent acclimation response to high Al application. The results suggest that the harmful effects of Al on photosynthesis might be partially alleviated through time-dependent mechanisms, particularly in the Al-tolerant sorghum cultivar.
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Claims 6
Claim · model-written summary
Aluminum initially affected pigments, chlorophyll fluorescence and photosynthesis more in the tolerant than sensitive sorghum cultivar.
- Material
- Al-tolerant cultivare0
- Treatment
- Al stresse0
- Outcome
- pigment concentration, chlorophyll fluorescence parameters, and photosynthetic ratese0
- Direction
- greater extente0
- Comparator
- susceptible cultivare0
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chloroplastidic" pigment concentration, chlorophyll fluorescence parameters, and photosynthetic rates were initially affected by Al stress to a greater extent in the Al-tolerant cultivar than in the susceptible cultivar”
e1“sorghum (Sorghum bicolor (L.) Moench)”
Claim · model-written summary
The tolerant cultivar progressively and sustainably decreased initial chlorophyll fluorescence under high Al.
- Material
- Al-tolerant genotypee0
- Treatment
- high Ale0
- Outcome
- initial chlorophyll fluorescencee0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Al-tolerant genotype seemed to cope with high Al via progressive, sustained decreases in initial chlorophyll fluorescence”
e1“sorghum (Sorghum bicolor (L.) Moench)”
Claim · model-written summary
Under high Al, the tolerant cultivar increased chlorophyll a/b ratio, PSII efficiency and carbon assimilation.
- Material
- Al-tolerant genotypee1
- Treatment
- high Ale1
- Outcome
- chlorophyll a/b ratio, photosystem II photochemical efficiency, net carbon assimilation ratee0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in chlorophyll a/b ratio, photosystem II photochemical efficiency, net carbon assimilation rate, and photosynthetic oxygen evolution”
e1“Al-tolerant genotype seemed to cope with high Al”
e2“sorghum (Sorghum bicolor (L.) Moench)”
Claim · model-written summary
Under high Al, the tolerant cultivar increased photosynthetic oxygen evolution.
- Material
- Al-tolerant genotypee1
- Treatment
- high Ale1
- Outcome
- photosynthetic oxygen evolutione0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in chlorophyll a/b ratio, photosystem II photochemical efficiency, net carbon assimilation rate, and photosynthetic oxygen evolution”
e1“Al-tolerant genotype seemed to cope with high Al”
e2“sorghum (Sorghum bicolor (L.) Moench)”
Claim · model-written summary
The aluminum-sensitive cultivar showed no apparent acclimation to high Al.
- Material
- Al-sensitive cultivare0
- Treatment
- high Al applicatione0
- Outcome
- acclimation responsee0
- Direction
- did not showe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Al-sensitive cultivar did not show any apparent acclimation response to high Al application”
e1“sorghum (Sorghum bicolor (L.) Moench)”
Claim · model-written summary
Authors suggested time-dependent mechanisms may partly alleviate Al harm to photosynthesis, particularly in tolerant sorghum.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“harmful effects of Al on photosynthesis might be partially alleviated through time-dependent mechanisms, particularly in the Al-tolerant sorghum cultivar”
The same questions in other papers
aluminium atom · physiology: photosynthesis · SorghumPositive and negative results
2 in the opposite direction
- 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.