Título:	Tolerance of upland rice genotypes to water deficit.
Autoria:	GUIMARÃES, C. M. STONE, L. F. RANGEL, P. H. N. SILVA, A. C. de L.
Afiliação:	CLEBER MORAIS GUIMARAES, CNPAF; LUIS FERNANDO STONE, CNPAF; PAULO HIDEO NAKANO RANGEL, CNPAF; ANA CLAUDIA DE L. SILVA, doutoranda UNESP.
Ano de publicação:	2013
Referência:	Revista Brasileira de Engenharia Agrícola e Ambiental, Campina Grande, v. 17, n. 8, p. 805-810, 2013.
Conteúdo:	Water deficit is one of the environmental factors that cause a great reduction in the upland rice grain yield. The objective of this study was to evaluate genotypes of upland rice with broad genetic diversity for tolerance to this stress and to identify secondary traits for evaluation of this tolerance. Sixty-four genotypes were evaluated during two years at the Experiment Station of EMATER, in Porangatu, GO, under well-watered and water deficit conditions. The genotypes showed differences in grain yield and were influenced differently by the water treatments, both under a mild water deficit in the first year and under a severe one in the second year. The genotype grain yield under water deficiency was significantly and positively correlated with tiller fertility, number of panicles m-2, 100-grain weight, and plant height, and negatively with spikelet sterility and the number of days for the occurrence of 50% panicle emergence. It was also observed that the most productive genotypes under water deficit conditions showed lower leaf temperature, indicating improved water status. Nine genotypes were productive in both water conditions and three were productive only when well-watered.
Thesagro:	Arroz Oryza sativa Irrigação Deficiência hídrica Temperatura
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPAF)