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Isolation and characterization of tenuazonic acid produced by Alternaria alternata, a potential bioherbicidal agent for control of Lantana camara

100%

Sanodiya B. S., Thakur G. S., Baghel R. K., Pandey A. K., Prasad G. B. K. S., Bisen P. S.

Journal of Plant Protection Research

2010

tom 50

nr 2

133-139

Microbial preparation of herbicide is defined as bioherbicide that can control the weed. In this approach, indigenous plant pathogens isolated from weeds are cultured to produce the large numbers of infective propagules which are applied at a rate that will cause high levels of infection leading to suppression of the target weed. During the present investigation, cell free culture filtrate (CFCF) of Alternaria alternata was evaluated for its phytotoxicity against a noxious weed Lantana camara. The results of cut shoot, seedling and detached leaf bioassays revealed the presence of a toxic metabolite in the CFCF and a significant reduction in chlorophyll and protein content were also noticed. Phytotoxic moiety was further purified and characterized by using solvent partition, thin layer chromatography (TLC), FTIR and 1H NMR analysis. The acetone extract induced maximum phytotoxic damage at a concentration of 100 μg/ml and TLC purified fraction also exhibited herbicidal potential. The toxic compound was identified as tenuazonic acid upon comparison with FTIR and 1H NMR spectra. This is the first evidence that confirmed the herbicidal potential of a biorational, tenuazonic acid was produced by submerged fermentation of A. alternata.

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Wplyw temperatury i okresu inkubacji na tworzenie toksycznych metabolitow przez Alternaria radicina i A. alternata

51%

Tylkowska K., Grabarkiewicz-Szczesna J., Szopinska D., Dorna H., Solfrizzo M., De G. A.

Acta Agrobotanica

2005

tom 58

nr 2

7-17

The production of toxic metabolites by four isolates of Alternaria radicina and two isolates of A. alternata in rice grains and carrot discs at 1, 10 and 20ºC was investigated. Incubation lasted 21 and 35 days or 14 and 28 days for rice grains and carrot discs, respectively. Accumulation of toxins in inoculated carrot roots stored for 24 weeks and in inoculated dried carrots stored for 48 weeks was also determined. It was found that A. radicina produced radicinin (RAD) and epi-radicinol (epi-ROH), whereas tenuazonic acid (TeA), altertoxin I (ATX I), alternariol (AOH) and alternariol methyl ether (AME) were produced by A. alternata. Although the isolates tested were capable of producing toxins in rice grains at 1ºC, none of them was detected in carrot discs. Accumulation of epi-ROH was observed in carrot roots stored for 24 weeks, whereas decreased amounts of RAD and epi-ROH were observed in dried carrots stored for 48 weeks. No A. alternata toxins were detected in stored carrot roots, whereas trace amounts of AOH were recorded in dried carrots after 32 and 48 weeks of storage.

Ograniczanie wyników

1 Acta Agrobotanica

1 Journal of Plant Protection Research

1 Baghel R. K.

1 Bisen P. S.

1 De G. A.

1 Dorna H.

1 Grabarkiewicz-Szczesna J.

1 Pandey A. K.

1 Prasad G. B. K. S.

1 Sanodiya B. S.

1 Solfrizzo M.

1 Szopinska D.

1 Thakur G. S.

1 Tylkowska K.

1 2010

1 2005

Wyniki wyszukiwania

Isolation and characterization of tenuazonic acid produced by Alternaria alternata, a potential bioherbicidal agent for control of Lantana camara

Wplyw temperatury i okresu inkubacji na tworzenie toksycznych metabolitow przez Alternaria radicina i A. alternata