Abstract
Maize plants were grown in nutrient solution containing 0, 15, 30, 50 mg organic carbon L −1 of humic substances (HS) (M.W. < 12 KDa) extracted from a cambisol. After 14 d of growth the second and third leaves were collected and analyzed for chlorophyll and protein content and for the activities of ATP sulphurylase (ATP-s) and O-acetylserine sulphydrylase (OAS-s) to evaluate the effect of HS on maize sulphate assimilation pathway. Humic substances induced significant decreases in chlorophyll content, whereas the protein level slightly increased up to 30 mg L −1 of HS. ATP-s and OAS-s were positively affected by HS. The stimulations were different according to the enzyme and leaf investigated. Our results suggest that HS might play an important role in the efficiency of maize plants to assimilate sulphate. Key words: ATP-sulphurylase, chlorophyll, humic substances, maize, O-acetylserine sulphydrilase
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Claims 4
Claim · model-written summary
Humic substances significantly decreased maize chlorophyll content.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Humic substances induced significant decreases in chlorophyll content”
t0“maize seedlings”
Claim · model-written summary
Protein level increased slightly with humic substances up to 30 mg L −1.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the protein level slightly increased up to 30 mg L −1 of HS”
t0“maize seedlings”
Claim · model-written summary
Humic substances stimulated ATP-s activity, with variation by leaf.
- Treatment
- HSe0
- Outcome
- ATP-se0
- Direction
- positively affectede0
- Qualifier
- different according to the enzyme and leaf investigatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ATP-s and OAS-s were positively affected by HS. The stimulations were different according to the enzyme and leaf investigated.”
t0“maize seedlings”
Claim · model-written summary
Humic substances stimulated OAS-s activity, with variation by leaf.
- Treatment
- HSe0
- Outcome
- OAS-se0
- Direction
- positively affectede0
- Qualifier
- different according to the enzyme and leaf investigatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ATP-s and OAS-s were positively affected by HS. The stimulations were different according to the enzyme and leaf investigated.”
t0“maize seedlings”
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