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Pesticide Biochemistry and Physiology 2016-Nov

Evaluation of antidesmone alkaloid as a photosynthesis inhibitor.

Watumiaji waliosajiliwa tu ndio wanaweza kutafsiri nakala
Ingia / Ingia
Kiungo kimehifadhiwa kwenye clipboard
Olívia Moreira Sampaio
Murilo Marinho de Castro Lima
Thiago André Moura Veiga
Beatriz King-Díaz
Maria Fátima das Graças Fernandes da Silva
Blas Lotina-Hennsen

Maneno muhimu

Kikemikali

Antidesmone, isolated from Waltheria brachypetala Turcz., owns special structural features as two α,β-unsaturated carbonyl groups and a side alkyl chain that can compete with the quinones involved in the pool of plastoquinones at photosystem II (PSII). In this work, we showed that the alkaloid is an inhibitor of Hill reaction and its target was located at the acceptor side of PSII. Studies of chlorophyll (Chl) a fluorescence showed a J-band that indicates direct action of antidesmone in accumulation of QA- (reduced plastoquinone A) due to the electron transport blocked at the QB (plastoquinone B) level similar to DCMU. In vivo assays indicated that antidesmone is a selective post-emergent herbicide probe at 300μM by reducing the biomass production of Physalis ixacarpa plants. Furthermore, antidesmone also behaves as pre-emergent herbicide due to inhibit Physalis ixacarpa plant growth about 60%. Antidesmone, a natural product containing a 4(1H)-pyridones scaffold, will serve as a valuable tool in further development of a new class of herbicides.

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