Phytotoxicity of exotic species on the physiological potential of crambe seeds (Crambe abyssinica Hochs)
DOI:
https://doi.org/10.18227/1982-8470ragro.v12i1.4329Palavras-chave:
Biological invasion. Germination. Secondary compounds.Resumo
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.Downloads
Publicado
Edição
Seção
Licença
Declaro em meu nome e em nome dos demais autores que aqui represento no ato da submissão deste artigo, à REVISTA AGRO@MBIENTE ON-LINE que: • 1. O conteúdo do artigo é resultado de dados originais e não publicados ou submetidos a outros periódicos. • 2. Além do autor principal, todos os co-autores participaram suficientemente do trabalho para tornar públicas as respectivas responsabilidades pelo conteúdo. • 3. Em caso de aceitação do artigo, os autores concordam que os direitos autorais a ele referentes se tornarão propriedade exclusiva da Revista Agro@mbiente On-line, vedada qualquer reprodução, total ou parcial, em qualquer outra parte ou meio de divulgação, impressa ou eletrônica, sem que a prévia e necessária autorização seja solicitada e que, se obtida, devem constar os agradecimentos à Revista Agro@mbiente On-line do Centro de Ciências Agrárias/UFRR.