Submitted by Ricardo Cedraz Duque Moliterno (ricardo.moliterno@uefs.br) on 2016-08-23T20:42:07Z No. of bitstreams: 1 Tese_ roberta.pdf: 1295963 bytes, checksum: 0d60f7d523d2599d8bf9e13a4722fa8e (MD5) / Made available in DSpace on 2016-08-23T20:42:07Z (GMT). No. of bitstreams: 1 Tese_ roberta.pdf: 1295963 bytes, checksum: 0d60f7d523d2599d8bf9e13a4722fa8e (MD5) Previous issue date: 2016-03-22 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / This study aims to identify promising progenitors and hybrids for crop improvement of the forage watermelon, for this purpose the heterosis, general and specific combination capacities were estimated, in addition, the phenotypic correlation, the path analysis between morphoagronomic and bromatological characteristics were determined. Five progenitors were evaluated; LPG (1), VM (2), MR (3), BGCIA 228 (4) and Jojoba (5) belonging to Embrapa Semi?rido?s BAG, the ten F1?s were obtained from balanced diallel crossing. An augmented design in complete randomized blocks, with tree replications and eight plants per plot was used. The following characteristics were evaluated: FRP, FRN, PP, FRC/DT, CES, PES, TSS, NS, P100S, PFS, PSS, ProdF, CP, NDF, IVDMD, EE and K. Among the genotypes, potentiality for exploitation in crop improvement programs was observed. The choice of elongated fruit took into account the preference of agriculturists, resulting in the selection of all progenitors expressing this feature. The hybrids were obtained and evaluated in order to select the most promising for obtaining superior progenies to their genitors for the evaluated characteristics. Regarding the production, hybrids 1x4 and 4x5 stood out in obtaining more prolific progenies. The heterosis for bromatological characteristics was low, except for K. The general combining ability indicated the potential of the progenitor VM in obtaining progenies with higher CP and EE levels, as well as MR can contribute to increase fruit production. From the specific combining ability, it was verified that the hybrid 1x4 mostly showed FRP, NS, PSS and EE, as the hybrids 2x4, 3x4 and 3x5 displayed FRN, IVDMD and CP, respectively. From the phenotypic correlation, it was observed that the fruit with enhanced FRC/DT will possess greater PES and FRP, however less CP. The ridge path analysis, with PP dependent variable showed positive and low direct effects to the majority of the characteristics, moreover, indicated the reduction in the CP and NDF contents, important characteristics to the forage plants. The path analysis showed that the EE may be used in the selection of progenitors with higher PB levels. This work provides the first information on the pre-improvement of this culture, contributing to the achievement of more productive progenies and composed of higher levels of EE and CP, important elements for increased animal productivity. / Este trabalho objetivou identificar genitores e h?bridos de melancia forrageira promissores para o melhoramento da cultura, para isto foi estimada a heterose, capacidade geral e espec?fica de combina??o, al?m disto, determinou-se a correla??o fenot?pica, a an?lise de trilha entre os caracteres morfoagron?micos e bromatol?gicos.Foram avaliados cinco genitores; LPG (1), VM (2), MR (3), BGCIA 228 (4) e Jojoba (5) pertencentes ao BAG da Embrapa Semi?rido, os dez h?bridos F1?s foram obtidos a partir de cruzamentos dial?licos balanceados.Foi utilizado um delineamento em blocos casualizados completos, com tr?s repeti??es e oito plantas por parcela. Foram avaliadas as seguintes caracter?sticas: FRP, FRN, PP, FRC/DT, CES, PES, TSS, NS, P100S, PFS, PSS, ProdF, PB, FDN, DIVMS, EE e K. Observou-se entre os gen?tipos potencialidade para a explora??o em programas de melhoramento. A escolha de frutos alongados levou em considera??o ? prefer?ncia dos agricultores, resultando na sele??o de todos os genitores que expressam esta caracter?stica. Os h?bridos foram obtidos e avaliados com o intuito de selecionar os mais promissores para a obten??o de prog?nies superiores aos seus pais para as caracter?sticas avaliadas. Em rela??o ? produ??o, os h?bridos 1x4 e 4x5 destacaram-se para obten??o de prog?nies mais profil?ticas. As heteroses para as caracter?sticas bromatol?gicas foram baixas, exceto para K. A capacidade geral de combina??o indicou a potencialidade do genitor VM para obten??o de prog?nies com maiores teores de PB e EE, assim como MR poder? contribuir com aumento da produ??o de frutos. A partir da capacidade espec?fica de combina??o verificou-se que o h?brido 1x4 sobressaiu para FRP, NS, PSS e EE, j? os h?bridos 2x4, 3x4 e 3x5 destacaram-se para FRN, DIVMS e PB, respectivamente. A partir da correla??o fenot?pica observou-se que frutos com maior FRC/DT possuir?o maiores PES e FRP,no entanto menor PB. A an?lise de trilha em crista, com vari?vel dependentePP, apresentou efeitos diretos positivos e baixos para a maioria dos caracteres, al?m disto, indicoua redu??o nos teores de PB e FDN, caracter?sticas importantes para as forrageiras. A an?lise de trilha mostrou-seque o EE pode ser usado na sele??o de progenitores com maiores teores de PB.Este trabalho traz as primeiras informa??es sobre o pr?-melhoramento desta cultura, contribuindo com a obten??o de prog?nies mais produtivas e compostas de maiores teores de EE e PB, elementos importantes para o aumento da produtividade animal.