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Previous issue date: 2017-02-23 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / V?rios estudos t?m demonstrado os efeitos ben?ficos da aplica??o de extratos de algas nas plantas, tais como a melhoria na germina??o e no estabelecimento das plantas. Apesar de alguns exemplos de aproveitamento comercial, a quase totalidade dessa biomassa n?o ? aproveitada pela popula??o. Tendo em conta seu alto valor nutritivo, existe um grande potencial para seu maior aproveitamento comercial. Diante disso, com o intuito de contribuir para o desenvolvimento de tecnologias de aproveitamento de algas na produ??o de mudas para reflorestamento e explora??o sustent?vel, analisaram-se os efeitos de algas coletadas no litoral do RN no crescimento inicial de esp?cies nativas da Caatinga. Foram testadas diferentes concentra??es (0, 15, 20, 25, 30, 35 e 40 g kg-1) de p? de algas (PA) marinhas com um substrato preparado contendo argila, esterco bovino e areia. Houve inicialmente efeito negativo do PA no crescimento em ambas as esp?cies, provavelmente por uma influ?ncia negativa na velocidade de germina??o. No entanto, o est?mulo na taxa de crescimento absoluto em doses mais altas para catingueira e intermedi?rias para juc? aos 60 dias ap?s semeadura (DAS) indicam efeito ben?fico do PA. Aos 120 DAS verificamos um est?mulo no aumento de biomassa das ra?zes e di?metro do coleto em juc? com rela??o ao aumento das doses de PA. Nesta esp?cie verificou-se tamb?m est?mulo no aumento da concentra??o de clorofilas a, b e carotenoides. O aumento na concentra??o de pigmentos em rela??o ?s doses de PA tamb?m se verificou em catingueira. Desta forma, n?o recomendamos a utiliza??o do PA para produ??o de mudas a partir da germina??o das sementes, no entanto, os resultados apresentados neste trabalho a longo prazo indicam influ?ncia positiva do o p? de algas marinhas no crescimento inicial das duas esp?cies end?micas da Caatinga quando aplicado em composi??o do substrato. / Several studies have demonstrated the beneficial effects of applying algae extracts to plants, such as improved germination and plant establishment. Despite some examples of commercial use, almost all of the algae biomass is not used by the population. Considering its high nutritional value, there is great potential for the commercial use of algae as substrate. Therefore, in order to contribute to the development of technologies for use of algae in the production of seedlings for reforestation and sustainable exploitation, we analyzed the effects of algae collected on the coast of the RN on the growth of Caatinga endemic species. Different concentrations (0, 15, 20, 25, 30, 35 and 40 g kg-1) of seaweed powder (SP) were tested with a prepared substrate containing clay, bovine manure and sand. Initialy there was a negative effect of the SP on the growth of both species, probably because a negative effect on the germination speed. However, the stimulation in the absolute growth rate in higher doses for catingueira and intermediates for juc? at 60 days after sowing (DAS) indicates a benefical effect of the SP. At 120 DAS we verified a stimulus in the increase of biomass of the roots and stem diameter in juc? in relation to the increase of SP doses. In this species there was also an increase in the concentration of chlorophylls a, b and carotenoids. The increase in the concentration of pigments in relation to the SP doses also occurred in catingueira. Therefore, we do not recommend the germination of seeds in a substrate containing SP for seedlings production, however, the results presented in this work in long term indicates that the seaweed powder positively influences the initial growth of seedlings of the two endemic Caatinga species when applied in the substrate composition.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/23932 |
| Date | 23 February 2017 |
| Creators | Ara?jo, J?ssica Mayara Hip?lito de |
| Contributors | 39198200453, Voigt, Eduardo Luiz, 93217617991, Galv?o, Thiago Barros, 06810598421, Praxedes, Sidney Carlos, Macedo, Cristiane Elizabeth Costa de |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM CI?NCIAS FLORESTAIS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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