Submitted by Ricardo Cedraz Duque Moliterno (ricardo.moliterno@uefs.br) on 2016-01-26T22:23:28Z No. of bitstreams: 1 TESE - MAYANA MATOS DE OLIVEIRA SANTOS.pdf: 6336990 bytes, checksum: 8a37abf8f9c86f7b5cc19e687200d6d8 (MD5) / Made available in DSpace on 2016-01-26T22:23:28Z (GMT). No. of bitstreams: 1 TESE - MAYANA MATOS DE OLIVEIRA SANTOS.pdf: 6336990 bytes, checksum: 8a37abf8f9c86f7b5cc19e687200d6d8 (MD5) Previous issue date: 2015-09-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The objectives of this study were to understand the role of the root system of amburana (Amburana cearensis (Fr. All.) AC Smith) and umbuzeiro (Spondias tuberosa Arr. Cam.) In maintaining the initial growth and assimilates partition of seedlings, and determine its contribution to the survival of the species in water restriction situations. For this, studies have been conducted about the early development and dry matter partitioning patterns in the production of seedlings, as well as surveys of their gas exchange, morphological and anatomical aspects, quantification and nature of the compounds stored in the underground system and leaves of young plants submitted to water restriction. For the species under study, preferred drains are the tuberous roots, followed by branches, leaves and lateral roots. Initially, tuberous roots behave as a high activity drain, until it completes its formation. Plants of S. tuberosa showed higher average of the A. cearensis for most of the growth variables, with consequent growth and further development. The results showed interference in the initial plant growth caused by the formation of tuberous root, which is a storage organ. The root system of the species consists of tuberous roots and slender lateral roots. The cross-sections showed that the slender lateral roots have periderm, cortex, vascular cylinder and exchange, and fiber support in both species and secreting structures only in S. tuberous. The cylinder vascular species is polyarc, being endarch and hollow in A. cearensis with obvious pith, and exarco and solid in S. tuberosa. The tuberous roots of species present additional exchanges. The species have adapted to drought, as the opening and closing mechanism of the stomata, water storage mechanism and nutrients in your tuberous roots and osmotic adjustment mechanism. The introduction of young plants of A. cearensis and S. tuberosa can be recommended for restoration programs of degraded areas and forest management. / Os objetivos desse trabalho foram compreender a atua??o do sistema radicular da amburana (Amburana cearensis (Fr. All.) A. C. Smith) e do umbuzeiro (Spondias tuberosa Arr. Cam.) na manuten??o do crescimento inicial e parti??o de fotoassimilados das mudas, e determinar a sua contribui??o para a sobreviv?ncia das esp?cies em situa??es de restri??o h?drica. Para tanto, foram realizados estudos a cerca dos aspectos morfoanat?micos, do desenvolvimento inicial e padr?es de parti??o de massa seca na produ??o de mudas, assim como levantamentos sobre suas trocas gasosas e quantifica??o e natureza dos compostos armazenados no sistema subterr?neo e folhas de plantas jovens submetidas ? condi??es de restri??o h?drica. Para as esp?cies em estudo, os drenos preferenciais s?o as ra?zes tuberosas, seguidos de ramos, folhas e ra?zes laterais. Inicialmente, as ra?zes tuberosas se comportam como um dreno de alta atividade, at? que se conclua sua forma??o. As plantas de S. tuberosa apresentaram m?dias superiores as de A. cearensis para a maioria das vari?veis de crescimento estudadas, com consequente crescimento e desenvolvimento mais acelerado. Os resultados demonstraram a interfer?ncia no crescimento inicial das plantas causada pela forma??o da raiz tuberosa, sendo este um ?rg?o de reserva. O sistema radicular das esp?cies ? formado por ra?zes tuberosas e ra?zes laterais delgadas. Os cortes transversais demonstraram que as ra?zes laterais delgadas apresentam periderme, c?rtex, c?mbio e cilindro vascular, al?m de fibra de sustenta??o em ambas as esp?cies e estruturas secretoras apenas na S. tuberosa. O cilindro vascular das esp?cies ? poliarco, sendo endarco e oco na A. cearensis, com par?nquima medular evidente, e exarco e s?lido na S. tuberosa. As ra?zes tuberosas das esp?cies apresentam c?mbios adicionais. As esp?cies apresentam adapta??es ao d?ficit h?drico, como o mecanismo de abertura e fechamento dos est?matos, mecanismo de armazenamento de ?gua e nutrientes em seu sistema radicular tuberoso e mecanismo de ajustamento osm?tico. A introdu??o de plantas jovens de A. cearensis e S. tuberosa pode ser recomendada para programas de restaura??o de ?reas degradadas e manejo florestal.