Abstract
The effects of zinc toxicity on growth, chlorophyll, total sugar and protein content and mineral content of lettuce plants infected or not by Arbuscular Mycorrhizal (Am) fungus Glomus etunicatum and treated with nutrient solution containing 0, 1.5, 3.5, 5.5, 7.5 mM ZnSO, were studied. The introduction of Zn caused a decrease in the inhibiting effect of zinc on dry weight of roots and shoots of lettuce plant infected by Am in contrary with non-Am plants. This increase observed in dry weight may be due to improvement of Phosphorous uptake by mycorrhizal fungi. The decrease in dry weight of non-Am plants may be because of inhibitory effects of zinc on growth. Chlorophyll and total sugar content decreased in both Am and non-Am plants, which indicate the toxic effect of Zn on photosynthesis and carbohydrate metabolism. Mycorrhizal plants due to changing the translocation of Zn and sequestering in the hypha could elevate the effects of Zn to some extent. Total protein content increased in Am plants, probably due to induction of antioxidant enzymes and some stress proteins but reduced in non-Am plants which maybe caused by toxic effects of Zn on protein synthesis. Alleviating the severe effects of Am fungus observed in this study aroused an interest in considering the role of Am fungi in protection and elevation the sever effects of heavy metals in plants.
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Claims 4
Claim · model-written summary
Mycorrhizal infection alleviated zinc inhibition of lettuce root and shoot dry weight.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- infected by Ame0
- Outcome
- dry weight of roots and shootse0
- Direction
- decreasee0
- Comparator
- non-Am plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The introduction of Zn caused a decrease in the inhibiting effect of zinc on dry weight of roots and shoots of lettuce plant infected by Am in contrary with non-Am plants”
t0“Lettuce Plants”
Claim · model-written summary
Chlorophyll and total sugar content decreased in both mycorrhizal and nonmycorrhizal lettuce.
- Taxon
- Lettuce PlantsLactuca sativat0
- Treatment
- zince1
- Outcome
- Chlorophyll and total sugar contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll and total sugar content decreased in both Am and non-Am plants”
t0“Lettuce Plants”
e1“The introduction of Zn caused a decrease in the inhibiting effect of zinc on dry weight of roots and shoots of lettuce plant infected by Am in contrary with non-Am plants”
Claim · model-written summary
Total protein content increased in mycorrhizal lettuce.
- Taxon
- Lettuce PlantsLactuca sativat0
- Treatment
- Ame0
- Outcome
- Total protein contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total protein content increased in Am plants”
t0“Lettuce Plants”
Claim · model-written summary
Total protein content decreased in nonmycorrhizal lettuce.
- Taxon
- Lettuce PlantsLactuca sativat0
- Treatment
- zince1
- Outcome
- Total protein contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total protein content increased in Am plants, probably due to induction of antioxidant enzymes and some stress proteins but reduced in non-Am plants”
t0“Lettuce Plants”
e1“The introduction of Zn caused a decrease in the inhibiting effect of zinc on dry weight of roots and shoots of lettuce plant infected by Am in contrary with non-Am plants”
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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.