Título:	Response mechanisms of Brachiaria brizantha cultivars to water deficit stress.
Autoria:	SANTOS, P. M. CRUZ, P. G. ARAUJO, L. C. de PEZZOPANE, J. R. M. VALLE, C. B. do PEZZOPANE, C. de G.
Afiliação:	PATRICIA MENEZES SANTOS, CPPSE; PEDRO GOMES DA CRUZ; LEANDRO COELHO DE ARAUJO; JOSE RICARDO MACEDO PEZZOPANE, CPPSE; CACILDA BORGES DO VALLE, CNPGC; CRISTIANA DE GASPARI PEZZOPANE.
Ano de publicação:	2013
Referência:	Revista Brasileira de Zootecnia, v. 42, n. 11, p. 767-773, nov. 2013.
Conteúdo:	Two cultivars of Brachiaria brizantha (Hochst ex. A. Rich) Stapf. (Syn. Urochloa) were evaluated for their adaptation to water deficit and the stress response mechanisms in a greenhouse experiment. The experimental design was in completely randomized blocks with a 2 × 2 × 4 factorial arrangement. The Marandu and BRS Piatã cultivars were evaluated under two water availability conditions, with or without water restriction. The harvests were carried out 0, 7, 14 and 28 days after the start of water restriction. For both cultivars, the water deficit stress caused a reduction in shoot biomass and leaf area and an increase in the percentage of roots in the deeper soil layers. The B. brizantha cv. Marandu reached critical levels of leaf water potential in a shorter period of water restriction than did the B. brizantha cv. BRS Piatã. The osmoregulation and deepening of the root system are mechanisms of adaptation to water stress observed in both Marandu and BRS Piatã cultivars. Besides that, the Marandu cultivar also increases its leaf senescence and, consequentially, decreases its leaf area, as a response to water deficit.
NAL Thesaurus:	water potential
Palavras-chave:	BRS Piatã Marandu Osmotic potential Water availability
ISSN:	1806-9290
Digital Object Identifier:	https://doi.org/10.1590/S1516-35982013001100001
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPPSE)