Abstract
Among the numerous plant species occurring in the Cerrado, Ouratea spectabilis stands out because of the lack of species that grow beneath its canopy. Therefore, this study aimed to evaluate the phytotoxic potential of different extracts and fractions of the hydroethanolic extract from leaves of O. spectabilis through laboratory bioassays of the pre-and post-emergence of seeds of Lactuca sativa L., determination of the mitotic index in root cells of Allium cepa L., antioxidant activity and phytochemical screening of different classes present in extracts and ethyl acetate fractions. It was possible to verify that different extracts and ethyl acetate fractions of O. spectabilis interfered with germination rates, as reduced germination was observed when compared with the control. Similarly, growth and development was affected in lettuce seedlings, as shown by the reduced length of primary roots and hypocotyls compared with the control. In addition, the mitotic index was reduced in treated groups compared with the negative control. HPLC-PAD analysis for both the hydroethanolic extract and its ethyl acetate fraction, showed a predominance of flavonoid compounds belonging to the groups of isoflavones and catechins in ethyl acetate fractions of hydroethanolic extracts. Thus, it was concluded that this species synthesizes phytotoxic compounds capable of interfering in the stabilization and development of other species.
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Claims 5
Claim · model-written summary
Different extracts and ethyl acetate fractions of O. spectabilis reduced germination of Lactuca sativa seeds compared with the control.
- Taxon
- Lactuca sativa L.
Lactuca sativae1 - Treatment
- different extracts and ethyl acetate fractions of O. spectabilise0
- Outcome
- germination ratese0
- Direction
- reducede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“different extracts and ethyl acetate fractions of O. spectabilis interfered with germination rates, as reduced germination was observed when compared with the control”
e1“seeds of Lactuca sativa L.”
Claim · model-written summary
The extracts and ethyl acetate fractions reduced the length of primary roots and hypocotyls of lettuce seedlings compared with the control.
- Taxon
- lettuceLactuca sativae0
- Treatment
- different extracts and ethyl acetate fractions of O. spectabilise1
- Outcome
- length of primary roots and hypocotylse0
- Direction
- reducede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth and development was affected in lettuce seedlings, as shown by the reduced length of primary roots and hypocotyls compared with the control”
e1“different extracts and ethyl acetate fractions of O. spectabilis”
Claim · model-written summary
The mitotic index in Allium cepa root cells was reduced in treated groups compared with the negative control.
- Taxon
- Allium cepa L.
Allium cepae1 - Organ / stage
- root cellse1
- Treatment
- treated groupse0
- Outcome
- mitotic indexe0
- Direction
- reducede0
- Comparator
- negative controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the mitotic index was reduced in treated groups compared with the negative control”
e1“root cells of Allium cepa L.”
Claim · model-written summary
HPLC-PAD analysis showed a predominance of flavonoid compounds of the isoflavone and catechin groups in the ethyl acetate fractions of the hydroethanolic extracts.
- Taxon
- Ouratea spectabilisOuratea spectabilise1
- Outcome
- predominance of flavonoid compounds belonging to the groups of isoflavones and catechinse0
Verbatim
e0“showed a predominance of flavonoid compounds belonging to the groups of isoflavones and catechins”
e1“Ouratea spectabilis stands out”
Claim · model-written summary
The authors conclude that O. spectabilis synthesizes phytotoxic compounds capable of interfering with the development of other species.
- Taxon
- Ouratea spectabilisOuratea spectabilise1
- Compound
- phytotoxic compoundse0
- Outcome
- interfering in the stabilization and development of other speciese0
Verbatim
e0“this species synthesizes phytotoxic compounds capable of interfering in the stabilization and development of other species”
e1“Ouratea spectabilis stands out”
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See all 271 papers →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.