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Multiple stresses on the oxidative metabolism of sugarcane varieties Ciência Rural
Morais,Marciana Bizerra de; Camara,Terezinha Rangel; Ulisses,Cláudia; Carvalho Filho,José Luiz Sandes; Willadino,Lilia.
ABSTRACT: The exposure of plants to multiple stress conditions can cause over production of reactive oxygen species promoting an imbalance in the redox system. The aim of this study was to examine the antioxidant response from varieties of sugarcane under adverse conditions, to understand the defense mechanisms of tolerant and sensitive genotypes. Micropropagated sugarcane of six genotypes, RB966928, RB98710, RB855453, RB99395, RB867515, and RB855156, were subjected to isolated action of high-temperature stress and a combination of water and saline stress, and effects were evaluated. Activities of enzymes such as superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX), as well as stress indicators such as lipid peroxidation (MDA content)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant enzyme; Abiotic stress; Saccharum; ROS.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000400201
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Mycorrhization and saline stress response in Hyptis suaveolens Ciência Rural
Souza,Marília Cristina Gomes de; Morais,Marciana Bizerra de; Andrade,Marcelo da Silva; Vasconcelos,Mayron Alves de; Sampaio,Silvana Saker; Albuquerque,Cynthia Cavalcanti de.
ABSTRACT: The objective of this study was to evaluate the physiological and biochemical mechanisms of adaptation of Hyptis suaveolens under osmotic stress due to salinity inoculations with a mycorrhizal fungal species. H. suaveolens seeds were germinated in polyethylene pots containing a substrate associated with or without arbuscular mycorrhizal fungi (AMF). After plant formation, treatments were treated with different salt concentrations (0.0, 35, 70, and 105 mM) and fungi (control and two types of AMF), totaling 12 treatments with three replicates. The experimental design used randomized blocks in a 4 x 3 factorial scheme, totaling 12 treatments with three replicates each. Salinity affected all measured physiological and biochemical variables, and the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant activity; Abiotic stress; Salinity; Arbuscular mycorrhizal fungi.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000600402
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Somatic embryos from Phalaenopsis classic Spotted Pink (Orchidaceae) protocorms Ciência Rural
Pereira,João Alves Ferreira; Ferreira,Laís Tomaz; Morais,Marciana Bizerra de; Ulisses,Cláudia.
ABSTRACT: The aim of the present study was to induce the formation of somatic embryos in protocorms from Phalaenopsis Classic Spotted Pink hybrids at two physiological maturation stages, namely: 80 and 120 days after seed inoculation (DASI). Protocorms were inoculated in ½ MS medium supplemented with 0.1 mg L-1 ANA and 3 mg L-1 TDZ. Protocorms were inoculated 120 days after sowing were more developed at the 15th cultivation day due to the formation of pro-embryogenic structures. It was possible seeing the formation of globular- and torpedo-stage somatic embryos at the 30th day of cultivation in somatic embryogenesis (SE) induction medium. The protocorms inoculated at the 80th DASI did not formed somatic embryos; they oxidized 20 days after cultivation in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Orchid; Protocormoids; Somatic embryogenesis.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000700401
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