Tolerance to water stress in grain sorghum

?rea de concentra??o: Produ??o Vegetal.Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2019-02-06T21:45:18Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) paulo_sergio_cardoso_batista.pdf: 2277279 bytes, checksum: 069a5ef4b8d5ad157b4ac6d7e83f386f (MD5)Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2019-03-07T17:20:15Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) paulo_sergio_cardoso_batista.pdf: 2277279 bytes, checksum: 069a5ef4b8d5ad157b4ac6d7e83f386f (MD5)Made available in DSpace on 2019-03-07T17:20:15Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) paulo_sergio_cardoso_batista.pdf: 2277279 bytes, checksum: 069a5ef4b8d5ad157b4ac6d7e83f386f (MD5) Previous issue date: 2018Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)O sorgo (Sorghum bicolor (L.) Moench) ? o quinto cereal mais importante do mundo, apresentando import?ncia na alimenta??o humana e produ??o de ra??es para animais em v?rias regi?es do planeta. O estresse h?drico ? um dos maiores problemas para a agricultura mundial, pois provoca danos significativos ao desenvolvimento das plantas. Dessa forma torna-se muito importante a realiza??o de trabalhos para sele??o de gen?tipos tolerantes ao estresse h?drico. Este trabalho teve como objetivo selecionar h?bridos de sorgo gran?fero para toler?ncia ao estresse h?drico, buscando determinar o comportamento das plantas de sorgo sob estresse h?drico, bem como selecionar caracter?sticas que auxiliem na sele??o dos gen?tipos mais tolerantes. O trabalho foi instalado em Nova Porteirinha-MG e Teresina-PI. Foram avaliados 20 h?bridos de sorgo gran?fero em ambientes sem estresse h?drico e com estresse h?drico em pr? e p?s-florescimento. O delineamento experimental foi de blocos casualizados, com tr?s repeti??es. O estresse h?drico provoca redu??o nos par?metros de crescimento do sorgo, com consequente redu??o no rendimento de gr?os. O estresse h?drico p?s-florescimento causa maior redu??o na produtividade de gr?os de sorgo do que o estresse h?drico pr?-florescimento. Os h?bridos mais produtivos nos ambientes com e sem estresse h?drico s?o 1G 282 e A9904. O ?ndice de colheita de pan?cula, a massa de mil gr?os e o ?ndice de ?rea foliar fotossinteticamente ativa podem ser utilizados para auxiliar na sele??o de gen?tipos de sorgo para produtividade de gr?os.Tese (Doutorado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2018.Sorghum (Sorghum bicolor (L.) Moench) is the fifth most important cereal in the world, with importance mainly in human food and animal feed production in various regions of the world. Water stress is one of the biggest problems for world agriculture, as it causes significant damage to the development of plants. Thus, it is important to carry out studies to select genotypes tolerant to water stress. The objective of this work was to carry out the phenotypic selection of sorghum genotypes for tolerance to water stress, in order to determine the behavior of sorghum plants under water stress, as well as to select characteristics that aid in the selection of the most tolerant genotypes. The work was installed in Nova Porteirinha-MG and Teresina-PI. Twenty hybrids of sorghum were evaluated in environments without water stress and with water stress in pre and post flowering. The experimental design was a randomized complete block design, with three replications. Water stress causes reduction in sorghum growth parameters, with a consequent reduction in grain yield. Post-flowering water stress causes a greater reduction in sorghum grain yield than pre-flowering water stress. The most productive hybrids in environments with and without water stress are 1G 282 and A9904. The panicle harvest index, the mass of a thousand grains and the leaf area index can be used to aid the selection of sorghum genotypes for grain yield