scholarly journals Phytotoxic Effects of Plant Essential Oils: A Systematic Review and Structure-Activity Relationship Based on Chemometric Analyses

Plants ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 36
Author(s):  
Ahmed M. Abd-ElGawad ◽  
Abd El-Nasser G. El Gendy ◽  
Abdulaziz M. Assaeed ◽  
Saud L. Al-Rowaily ◽  
Abdullah S. Alharthi ◽  
...  
Keyword(s):  
Essential Oils ◽  
Structure Activity Relationship ◽  
Activity Relationship ◽  
Chemical Compositions ◽  
Plant Essential Oils ◽  
Phytotoxic Activity ◽  
Structure Activity ◽  
Synthetic Chemicals ◽  
Hexahydrofarnesyl Acetone ◽  
Principal Roles

Herbicides are natural or synthetic chemicals used to control unwanted plants (weeds). To avoid the harmful effects of synthetic herbicides, considerable effort has been devoted to finding alternative products derived from natural sources. Essential oils (EOs) from aromatic plants are auspicious source of bioherbicides. This review discusses phytotoxic EOs and their chemical compositions as reported from 1972 to 2020. Using chemometric analysis, we attempt to build a structure-activity relationship between phytotoxicity and EO chemical composition. Data analysis reveals that oxygenated terpenes, and mono- and sesquiterpenes, in particular, play principal roles in the phytotoxicity of EOs. Pinene, 1,8 cineole, linalool, and carvacrol are the most effective monoterpenes, with significant phytotoxicity evident in the EOs of many plants. Caryophyllene and its derivatives, including germacrene, spathulenol, and hexahydrofarnesyl acetone, are the most effective sesquiterpenes. EOs rich in iridoids (non-terpene compounds) also exhibit allelopathic activity. Further studies are recommended to evaluate the phytotoxic activity of these compounds in pure forms, determine their activity in the field, evaluate their safety, and assess their modes of action.

Bleaching Activity of New 2-Phenylpyridazinones: Structure-Activity Relationship

1982 ◽  
Vol 37 (11-12) ◽  
pp. 1092-1094 ◽  
Author(s):  
Gerhard Sandmann ◽  
Peter Böger
Keyword(s):  
Quantitative Structure Activity Relationship ◽  
Structure Activity Relationship ◽  
Activity Relationship ◽  
Pigment Formation ◽  
Meta Position ◽  
Phytotoxic Activity ◽  
Structure Activity ◽  
Lipophilicity Parameter ◽  
Bleaching Activity ◽  
Plant Pigment

Abstract New 2-phenylpyridazinones, analogs of 4-chloro-5-methylamino-2-phenylpyridazin-3(2H)ones, were assayed for their phytotoxic activity to interfere with plant pigment formation. Six derivatives with - SCF3, - OCF2CHFCF3, - OCHF2, - CN, or - Br in meta position of the phenyl ring exhibited similar or better bleaching activity than the m-CF3 analog (norflurazon). The activity is predominantly determined by positive σ values and by lipophilicity of the substituent. On the basis of 11 analogs, a quantitative structure-activity relationship by a Hansch equation was accomplished with σm and the lipophilicity parameter π as variables.

scholarly journals (+)-epi-Epoformin, a Phytotoxic Fungal Cyclohexenepoxide: Structure Activity Relationships

2018 ◽  
Author(s):  
Antonio Cala ◽  
Marco Masi ◽  
Alessio Cimmino ◽  
José M.G. Molinillo ◽  
Francisco A. Macías ◽  
...  
Keyword(s):  
Fungal Pathogen ◽  
Biological Activities ◽  
Spectroscopic Characterization ◽  
Structure Activity Relationship ◽  
Significant Loss ◽  
Cork Oak ◽  
Activity Relationship ◽  
Wheat Coleoptile ◽  
Phytotoxic Activity ◽  
Structure Activity

(+)-epi-Epoformin (1), is a fungal cyclohexene epoxide isolated together with diplopimarane and sphaeropsidins A and C, a nor-ent-pimarane and two pimaranes, from the culture filtrates of Diplodia quercivora, a fungal pathogen for cork oak in Sardinia, Italy. Compound 1 possesses a plethora of biological activities including: antifungal, zootoxic and phytotoxic activity. The last activity and the peculiar structural feature of 1 suggested to carry out a structure activity relationship study, preparing eight key hemisynthetic derivatives and their phytotoxicity was assayed. The complete spectroscopic characterization and the activity in the etiolated wheat coleoptile bioassay of all the compounds is reported. Most of the compounds inhibited growth and some of them had comparable or higher activity than the natural product and the reference herbicide Logran. As regards the structure-activity relationship, the carbonyl proved to be essential for their activity of 1, as well as the conjugated double bond, while the epoxide could be altered with no significant loss.

Structure-activity relationship of (-) mammea A/BB derivatives against Leishmania amazonensis

Planta Medica ◽  
2008 ◽  
Vol 74 (09) ◽  
Author(s):  
MA Brenzan ◽  
CV Nakamura ◽  
BPD Filho ◽  
T Ueda-Nakamura ◽  
MCM Young ◽  
...  
Keyword(s):  
Structure Activity Relationship ◽  
Leishmania Amazonensis ◽  
Activity Relationship ◽  
Structure Activity ◽  
Relationship Of
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