Phytotoxicity of exotic species on the physiological potential of crambe seeds (Crambe abyssinica Hochs)

Authors

  • Silvana Fraga Silva Universidade Federal do Ceará - UFC
  • Halina Stéffany Lopes Costa Universidade Federal do Ceará
  • Jesimiel Silva Viana Universidade Federal do Ceará
  • Sebastião Medeiros Filho Universidade Federal do Ceará

DOI:

https://doi.org/10.18227/1982-8470ragro.v12i1.4329

Keywords:

Biological invasion. Germination. Secondary compounds.

Abstract

Biological invasions of exotic plants can seriously contribute to ecological imbalances within areas to which they have been introduced, affecting, in addition to native plants, cultivated species. Consequently, the objective of the current study was to evaluate effects of allelopathic extracts of three exotic species on the physiological quality of crambe seeds. Aqueous extracts of Prosopis juliflora (Sw.) DC (algaroba) were formulated; Azadirachta indica A. Juss (Nim) and Cryptostegia madagascariensis Bojer ex Decne (viuvinha) at 20% (200 g of dried leaves per liter of distilled water) placed in B.O.D at 25 ° C for 24 h. Petri dishes, lined with germitest paper sheets, were moistened with aqueous extracts at 2,5 times de paper weight. In the experimental trial, we used the completely randomized, with four treatments (three extracts + control treatment) and four replicates of 25 seeds. The first and second germination counts were evaluated in the fourth and tenth days respectively; germination rate index (GRI), allelopathic effect index (AEI), seedling length and dry mass. P. juliflora and C. madagascariensis reduced germination by 84 and 91%, respectively, in the first count. The GRI was affected by the three species, while the AEI showed greater allelopathy for C. madagascariensis, reaching -0.90. Seedlings lengths were reduced in the presence of P. juliflora and C. madagascariensis. For crambe seeds, all extracts negatively affected their physiological potential.

Author Biographies

Silvana Fraga Silva, Universidade Federal do Ceará - UFC

Aluna de mestrado do programa de pós-graduação em Agronomia/Fitotecnia, desenvolvendo trabalhos no Laboratório de Análise de Sementes do departamento de fitotecnia da Universidade Federal do Ceará.

Halina Stéffany Lopes Costa, Universidade Federal do Ceará

Mestranda em Agronomia/Fitotecnia na Universidade Federal do Ceará

Jesimiel Silva Viana, Universidade Federal do Ceará

Graduando em agronomia e bolsista de iniciação científica na Universidade Federal do Ceará.

Sebastião Medeiros Filho, Universidade Federal do Ceará

Prof. Titular da Universidade Federal do Ceará.

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Published

23/12/2017

Issue

Vol. 12 No. 1 (2018): JANEIRO - MARÇO

Section

Technical Note

License

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