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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Sensitivity of salad greens (Lactuca sativa L. and Eruca sativa Mill.) exposed to crude extracts of toxic and non-toxic cyanobacteria

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Author(s):
Bittencourt-Oliveira, M. C. [1, 2] ; Hereman, T. C. [1, 2] ; Macedo-Silva, I [2] ; Cordeiro-Araujo, M. K. [1, 3] ; Sasaki, F. F. C. [1] ; Dias, C. T. S. [4]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Biol Sci, BR-13418900 Piracicaba, SP - Brazil
[2] Univ Estadual Paulista Julio Mesquita Filho UNESP, Grad Program Biol Sci, BR-13506900 Rio Claro, SP - Brazil
[3] Univ Fed Rural Pernambuco UFRPE, Grad Program Bot, BR-52171030 Recife, PE - Brazil
[4] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Exact Sci, BR-13418900 Piracicaba, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Brazilian Journal of Biology; v. 75, n. 2, p. 273-278, MAY 2015.
Web of Science Citations: 1
Abstract

We evaluated the effect of crude extracts of the microcystin-producing (MC+) cyanobacteria Microcystis aeruginosa on seed germination and initial development of lettuce and arugula, at concentrations between 0.5 μg.L–1 and 100 μg.L–1 of MC-LR equivalent, and compared it to crude extracts of the same species without the toxin (MC–). Crude extracts of the cyanobacteria with MC (+) and without MC (–) caused different effects on seed germination and initial development of the salad green seedlings, lettuce being more sensitive to both extracts when compared to arugula. Crude extracts of M. aeruginosa (MC+) caused more evident effects on seed germination and initial development of both species of salad greens than MC–. Concentrations of 75 μg.L–1 and 100 μg.L–1 of MC–LR equivalent induced a greater occurrence of abnormal seedlings in lettuce, due to necrosis of the radicle and shortening of this organ in normal seedlings, as well as the reduction in total chlorophyll content and increase in the activity of the antioxidant enzyme peroxidase (POD). The MC– extract caused no harmful effects to seed germination and initial development of seedlings of arugula. However, in lettuce, it caused elevation of POD enzyme activity, decrease in seed germination at concentrations of 75 μg.L–1 (MC-75) and 100 μg.L–1 (MC-100), and shortening of the radicle length, suggesting that other compounds present in the cyanobacteria extracts contributed to this result. Crude extracts of M. aeruginosa (MC–) may contain other compounds, besides the cyanotoxins, capable of causing inhibitory or stimulatory effects on seed germination and initial development of salad green seedlings. Arugula was more sensitive to the crude extracts of M. aeruginosa (MC+) and (MC–) and to other possible compounds produced by the cyanobacteria. (AU)