Título:	Water restriction in different phenological stages and increased temperature affect cowpea production.
Autoria:	BARROS, J. A. R. GUIMARÃES, M. J. M. SIMOES, W. L. MELO, N. F. de ANGELOTTI, F.
Afiliação:	Juliane Rafaele Alves Barros; Miguel Julio Machado Guimarães; WELSON LIMA SIMOES, CPATSA; NATONIEL FRANKLIN DE MELO, CPATSA; FRANCISLENE ANGELOTTI, CPATSA.
Ano de publicação:	2021
Referência:	Ciência e Agrotecnologia, v. 45, e022120, 2021.
Conteúdo:	Water deficit and high temperatures are abiotic factors that most limit plant growth and development. However, its effects depend on crop development stage and on stress duration and intensity. Thus, the objective of was to evaluate the development of cowpea subjected to water restriction in different phenological stages and to increase in air temperature. The experiment was conducted with the cultivar ?Carijó?, in growth chambers, in a 4 x 3 x 2 factorial arrangement, corresponding to levels of water availability (25, 50, 75, and 100%,), phenological stages (vegetative, flowering and pod filling) and temperature regimes (T°1: 20-26-33 °C e T°2: 24.8-30.8-37.8 °C), respectively. Reduction of water availability in the vegetative and flowering stages caused decrease in grain production. The percentage of aborted flowers was higher in plants maintained under an increased temperature of +4.8 °C, with consequent reduction in grain production. Higher water availability values favored shoot and root dry mass production. Increase of 4.8 °C did not affect shoot and root dry mass but reduced water use efficiency by about 83%. The highest enzymatic activities of CAT, GPX and SOD were found in plants subjected to the temperature of +4.8 °C. Only APX showed lower enzymatic activity with increasing temperature. The cv. ?Carijó? is more sensitive to the 4.8 °C increase in air temperature than to water deficits.
Thesagro:	Feijão Vigna Unguiculata Fenologia Temperatura
NAL Thesaurus:	Abiotic stress Oxidative stress Phenology
Palavras-chave:	Restrição hídrica Estágios fenológicos Aumento da temperatura
Digital Object Identifier:	http://dx.doi.org/10.1590/1413-705420214502212
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPATSA)