PHYSIOLOGICAL RESPONSE OF CONVENTIONAL AND TRANSGENIC MAIZE TO WATER STRESS

Authors

  • JOÃO PAULO LEMOS Universidade Federal de Viçosa
  • GUSTAVO ANTÔNIO MENDES PEREIRA Universidade Federal de Viçosa
  • CHRISTIANO DA CONCEIÇÃO DE MATOS Universidade do Estado de Minas Gerais unidade de Ituiutaba https://orcid.org/0000-0002-0385-8737
  • EMERSON TROGELLO
  • JOÃO CARLOS CARDOSO GALVÃO
  • ANTONIO ALBERTO DA SILVA Universidade Federal de Viçosa

DOI:

https://doi.org/10.18512/rbms2020v19e1144

Keywords:

Zea mays, Bacillus thuringiensis, chlorophyll fluorescence, genetic modification

Abstract

Genetic modifications of plants can affect their ability to use environmental resources. It is known that the anthropic action has caused global climate changes, such as increases in temperature and drought. In view of this, the objective of this study was to evaluate if the addition of the Bt gene influences the physiological performance of isogenic maize hybrids grown under water stress and optimal conditions. Three Bt and non-Bt maize hybrids (Agromen 30A95, Dow 2B707 and BG 7049Y) were cultivated in soil with moisture content at 60% (water stress) and 100% of the field capacity (FC). Among the hybrids, the 30A95 presented greater variation between Bt and non-Bt hybrids in regard to physiological variables. The addition of the Bt gene practically had no impact on the photosynthetic performance of the 2B707 and BG7049 hybrids. The presence of the Bt gene increased the sensitivity to water stress in the hybrids, with reduction of maximal fluorescence and chlorophyll content in the plants. Regardless of the genetic factor (Bt or non-Bt), water stress reduced transpiration, stomatal conductance, photosynthetic rate, and maximum quantum yield of the PSII in maize plants. It was concluded that the presence of the Bt gene in maize indicates a reduction in the photosynthetic potential of the plant grown under water stress.

Published

2020-10-12

How to Cite

LEMOS, J. P., PEREIRA, G. A. M., MATOS, C. D. C. D., TROGELLO, E., GALVÃO, J. C. C., & SILVA, A. A. D. (2020). PHYSIOLOGICAL RESPONSE OF CONVENTIONAL AND TRANSGENIC MAIZE TO WATER STRESS. REVISTA BRASILEIRA DE MILHO E SORGO, 19, 17. https://doi.org/10.18512/rbms2020v19e1144

Issue

Section

Scientific Paper

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