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No. of bitstreams: 1 PDF - Emannuella Hayanna Alves de Lira.pdf: 1372178 bytes, checksum: 438b6581ece1ed43e8780c22ab7498f0 (MD5) Previous issue date: 2016-02-17 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In the present study is proposed test the hypothesis that salinity affects the mobilization of reserves for the development of Jatrophaseedlings with damage to the growth and stabilization of the seedlings. The study consisted of three experiments, where in the 1st was standardized the experimental driving time, salt dosages and the best time to collect the seedlings to be used in subsequent experiments. For this purpose, were used two genotypes of Jatropha (CNPAPM-X and CNPAPM-III) and 5 concentrations of NaCl (0; 50; 100; 150; 200 mM) applied between the 4th and 8th days after sowing. In this experiment it was found that the NaCl dose which provided the highest germination rate for the CNPAPM-X genotype was 200 mM and for CNPAPM-III genotype was 50 mM.Furthermore, it was observed that the genotype CNPAPM-X was more tolerant to salt stress, during the germination phase, than the CNPAPM-III genotype. Thus, the doses of 75 and 150 mMNaCl were defined such as moderate and severe, respectively, to be used in subsequent experiments. In experiment 2, to define the effect of salinity on the initial growth of Jatropha seedlings were evaluated the water status through the moisture percentage, relative water content, ion partition and physiological damage in membrane seedlings treated with 0; 75 and 150 mMNaCl. In this experiment it could be suggested that the water status of Jatropha seedlings is hampered by the increasing salinity, by reducing the accumulation capacity + of water by plants and this may be associated with increased content of Na especially on the stem, indicating that this part works like asaccumulator of this ion.The relationship between the effects of salinity on growth of seedlings were evaluated in the third experiment through quantification of sugars, starch, proteins, amino acids and lipids in cotyledonary leaves, stem and roots. In this experiment there was an increase in the content of all classes of macromolecules analyzed in at least one of the organs studied. This experiment concluded that the accumulation of these macromolecules in the analyzed parts could assist in osmotic adjustment process Jatrophaseedlings under salinity, although this accumulation has not been able to prevent losses in the biomass of plants. Further, it was found that salinity caused inhibition of lipid mobilization and carbon reserves, factors that together with the synthesis of proteins and amino acids contribute to the salinity tolerance of these plants. / No presente trabalho propôs-se testara hipótese de que a salinidade afeta a mobilização de reservas durante o desenvolvimento de plântulas de pinhão manso com prejuízos ao crescimento e estabilização das plântulas. A pesquisa constou de 3experimentos, onde no1°padronizou-se , as doses de sal e a melhor fase para a coleta das plântulas a serem utilizadas nos experimentos subsequentes. Para tanto, utilizou-se dois genótipos de pinhão manso (CNPAPM-X e CNPAPM- III) e 5 concentrações de NaCl (0; 50; 100; 150; 200mM) aplicados entre o 4° e 8° dia após a semeadura. Nesse experimento verificou-se que a dose de NaCl que proporcionou maior índice de germinação para o genótipo CNPAPM-X foi a de 200 mM e para o genótipo CNPAPM-III foi a de 50 mM.Ainda, observou-se que o genótipo CNPAPM-X foi mais tolerante à salinidade durante a fase germinativa do que o genótipo CNPAPM-III. Assim, definiu-se as doses de 75 e 150 mM de NaCl como tratamentos moderado e severo, respectivamente, a serem utilizados nos experimentos subsequentes. No experimento 2 para se definir o efeito da salinidade no crescimento inicial de plântulas de pinhão manso avaliou-se o status hídrico através do percentual de umidade, conteúdo relativo de água, partição iônica e os danos fisiológicos em membrana de plântulas tratadas com 0; 75 e 150 mM de NaCl. Nesse experimento é possível sugerir que o status hídrico de plântulas depinhão manso é prejudicado pelo aumento da salinidade, através de uma redução na capacidade do acumulo de água pelas plantas e que isso + pode estar associado ao aumento do conteúdo de Na principalmente no caule, indicando que este órgão funciona como acumulador deste íon. A relação entre os efeitos da salinidade no crescimento de plântulas foram avaliados no experimento 3 através da quantificação de açucares, amido, proteínas, aminoácidos e lipídios em folhas cotiledonares, caule e raízes. Nesse experimento observou-se aumento no conteúdo de todas as classe de macromoléculas analisadas em ao menos 1 dos órgão estudados.Este experimento permitiu concluir que o acúmulo dossolutos orgânicosanalisados podem auxiliar no processo de ajustamento osmótico de plântulas de pinhão manso sob salinidade, embora esse acumulo não tenha sido capaz de impedir as perdas na biomassa das plântulas.Ainda, verificou-se que a salinidade provocou inibição da mobilização de lipídios e reservas de carbono, fatores que juntamente com a síntese de proteínas e aminoácidos contribuem para a tolerância dessas plantas a salinidade.