GAS EXCHANGE AND ENZYMATIC METABOLISM IN GRAIN SORGHUM VARIETIES IRRIGATED WITH SALINE WATER

Authors

  • MIGUEL JULIO MACHADO GUIMARÃES Universidade Federal do Vale do São Francisco https://orcid.org/0000-0002-5497-6442
  • WELSON LIMA SIMÕES Embrapa Semiárido
  • JOSÉ NILDO TABOSA Instituto Agronômico de Pernambuco
  • TEREZINHA RANGEL CAMARA Universidade Federal Rural de Pernambuco
  • LILIA GOMES WILLADINO Universidade Federal Rural de Pernambuco

DOI:

https://doi.org/10.18512/rbms2020v19e1188

Keywords:

salinity, Sorghum bicolor (L.). Moench, oxidative stress.

Abstract

The objective of this study was to evaluate the effect of irrigation water salinity on gas exchange and antioxidative system responses of grain sorghum varieties. An experiment was conducted in a greenhouse located at the headquarters of Embrapa Semiarid Agriculture, Petrolina-PE, Brazil. The experimental design was randomized blocks, in a 6 x 5 factorial scheme. Six varieties of grain sorghum irrigated with saline water with five levels of salinity were evaluated. Photosynthesis and transpiration rate, stomatal conductance, leaf temperature, intrinsic and instantaneous water use efficiency, relative water content and leaf turgor potential were evaluated, as well as the activity of the enzymes catalase, ascorbate peroxidase and superoxide dismutase, and shoot biomass production. It was observed that irrigation with saline water causes reduction in the gas exchange and water status of grain sorghum varieties. The antioxidative system was activated in the six sorghum varieties to avoid the accumulation of reactive oxygen species, and the synchronism between the enzymes led to a better response of shoot dry mass production of the Ponta Negra variety.

Author Biography

MIGUEL JULIO MACHADO GUIMARÃES, Universidade Federal do Vale do São Francisco

Engenheiro Agrônomo formado pela Universidade Federal do Recôncavo da Bahia (2012), possui Mestrado (2014) e Doutorado (2017) em Engenharia Agrícola pela Universidade Federal Rural de Pernambuco (UFRPE). Atualmente faz parte do Programa Nacional de Pós-Doutorado (PNPD/CAPES) no Programa de Pós-Graduação em Engenharia Agrícola (CPGEA/UNIVASF). Atua com estudos voltados para o Manejo de recursos hídricos em regiões semiáridas, desenvolvendo trabalhos no ramo das Geociências nas áreas de Topografia e Geoprocessamento. Possui experiência docente em cursos técnicos de Agricultura e Agropecuária; graduação em Engenharia Agrícola, Engenharia Civil, Engenharia Elétrica, Engenharia Mecânica, Segurança do trabalho, Gestão Comercial e Administração; pós-graduação lato sensu em Engenharia de Segurança do Trabalho e Gestão de projetos; pós-graduação stricto sensu em Engenharia Agrícola. Principais disciplinas ministradas: Desenho Técnico, Geometria Analítica, Topografia, Geoprocessamento e Construções Rurais.

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Published

2020-10-11

How to Cite

GUIMARÃES, M. J. M., SIMÕES, W. L., TABOSA, J. N., CAMARA, T. R., & WILLADINO, L. G. (2020). GAS EXCHANGE AND ENZYMATIC METABOLISM IN GRAIN SORGHUM VARIETIES IRRIGATED WITH SALINE WATER. REVISTA BRASILEIRA DE MILHO E SORGO, 19, 14. https://doi.org/10.18512/rbms2020v19e1188

Issue

Vol. 19 (2020)

Section

Scientific Paper

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