Chitosan application in the induction of water deficit tolerance in maize plants

Lorena Gabriela Almeida; Paulo César Magalhães; Décio Karam; Eder Marcos da  Silva; Amauri Alves  Alvarenga

doi:10.4025/actasciagron.v42i1.42463

Authors

Lorena Gabriela Almeida Universidade Federal de Lavras Author http://orcid.org/0000-0002-2018-2206
Paulo César Magalhães Empresa Brasileira de Pesquisa Agropecuaria Author
Décio Karam Empresa Brasileira de Pesquisa Agropecuária Author
Eder Marcos da Silva Universidade Federal de Lavras Author
Amauri Alves Alvarenga Universidade Federal de Lavras Author

DOI:

https://doi.org/10.4025/actasciagron.v42i1.42463

Keywords:

antiperspirant; antioxidant enzymes; water stress; gas exchange.

Abstract

The present research seeks to elucidate the feasibility of chitosan (CHT) in the induction of water deficit tolerance in different maize hybrids, contrasting tolerance to water restriction, tolerance and sensitivity. The maize plants were subjected to water deficit and foliar application of different chitosan doses (60, 100, 140, and 180 mg L^-1) at the pre-flowering growth stage and evaluated during the stress period of fifteen days. To understand the induction behaviour of the tolerance to water restriction, biophysical parameters, such as water potential, relative water content and chlorophyll content, gas exchange, and biochemical assays, were quantified based on the activity of SOD, CAT, APX, and PAL antioxidant enzymes, lipid peroxidation activity and hydrogen peroxide content. Among the treatments, maize plants subjected to chitosan foliar application at a dose of 140 mg L^-1 presented similar behavioural responses to plants under favourable irrigation conditions. Such positive responses are related to the high degree of activity of antioxidant enzymes, gas exchange and low levels of lipid peroxidation and hydrogen peroxide. The results support the potential use of CHT to increase tolerance to water stress.

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