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metadata.artigo.dc.title: ABA application to maize hybrids contrasting for drought tolerance: changes in water parameters and in antioxidant enzyme activity
metadata.artigo.dc.creator: Souza, Thiago Corrêa de
Magalhães, Paulo César
Castro, Evaristo Mauro de
Carneiro, Newton Portilho
Padilha, Fábio Andrade
Gomes Júnior, Carlos César
metadata.artigo.dc.subject: Corn – Water stress resistance
Abscisic acid
Plants – Physiology
Milho – Resistência ao estresse hídrico
Ácido abscísico
Plantas – Fisiologia
Zea mays
metadata.artigo.dc.publisher: Springer Jul-2014
metadata.artigo.dc.identifier.citation: SOUZA, T. C. de et al. ABA application to maize hybrids contrasting for drought tolerance: changes in water parameters and in antioxidant enzyme activity. Plant Growth Regulation, [Dordrecht], v. 73, n. 3, p. 205-217, July 2014.
metadata.artigo.dc.description.abstract: The objective of this study was to evaluate the effects of abscisic acid (ABA) related to the increase of water-stress tolerance in two drought contrasting maize hybrids: DKB 390 (tolerant) and BRS 1030 (sensitive). The characterization of water status (pre-dawn leaf water potential, Ψpd; midday leaf water potential, Ψmd and stem water potential, Ψst) and antioxidant enzyme activity was conducted on greenhouse grown plants. The ABA, hydrogen peroxide (H2O2), and malondialdehyde (MDA) contents were also analyzed. Water deficit was imposed for 10 days at the flowering stage and a dosage of 100 μM ABA was applied to plant canopy. Measurements were taken during 10 days after the water recovery. With 5 days of stress, the tolerant hybrid showed lower MDA content, decrease in the water status, and higher activity of the enzymes superoxide dismutase, catalase, ascorbate peroxidase, as well as guaiacol, glutathione reductase, dehydroascorbate reductase, polyphenol oxidase, and l-phenylalanine ammonia-lyase, as compared to the sensitive hybrid. With 10 days of stress, DKB 390 had a decrease in the activity of enzymes whereas BRS 1030 showed a higher activity. In addition, the latter showed greater amounts of H2O2 and MDA. ABA application led to a higher tolerance only in DKB 390, due to the increase of water status and the enzymatic activity, mainly the catalase.
metadata.artigo.dc.language: en_US
Appears in Collections:DBI - Artigos publicados em periódicos

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