Identification of drought-tolerant corn genotypes by multivariate analysis

Authors

  • Ricardo Silva de Sousa Universidade Federal do Piauí, Teresina, Piauí, Brasil, ricardoss@ufpi.edu.br http://orcid.org/0000-0002-0898-0774
  • Edson Alves Bastos Empresa Brasileira de Pesquisa Agropecuária (Embrapa Meio-Norte), Teresina, Piauí, Brasil, edson.bastos@embrapa.br
  • Milton José Cardoso Embrapa Meio-Norte
  • Diléia Rocha Pereira Universidade Federal do Piauí, Teresina, Piauí, Brasil, dileia01@hotmail.com

Keywords:

Multivariate discrimination, water stress, chlorophyll, leaf area index.

Abstract

The identification of genotypes that are tolerant to water deficit is crucial for the maintenance of the agricultural production. This study aimed to evaluate the genotypic variation for drought tolerance among corn genotypes by means of multivariate analysis, as well as to identify hybrids with high grain yield under conditions of water deficit and full irrigation. For this purpose, an experiment was conducted in a randomized block design, with 36 corn hybrids, being 34 experimental elite and two commercial (controls) hybrids, under water deficit and full irrigation, during the reproductive stage, with four replications. The irrigation levels, added to the rainfall, totaled 691.6 mm under full irrigation and 490.8 mm under water deficit. The evaluation encompassed the leaf area index, leaf chlorophyll content, interval between male and female flowering, number of rows per ear, number of grains per ear, ear length, 100-grain weight, ear yield, ear index, total number of grains, number of ears per m2, grain yield at 13 % of moisture and water-use efficiency. The evaluated hybrids showed useful genetic diversity for drought tolerance. Four experimental elite hybrids (3G7395, 3G7415, 1G7034 and 3G7335) stood out under water deficit, showing a high grain yield performance, if compared to the average of the control hybrids.

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Author Biographies

Ricardo Silva de Sousa, Universidade Federal do Piauí, Teresina, Piauí, Brasil, ricardoss@ufpi.edu.br

http://lattes.cnpq.br/5765420847057459

Edson Alves Bastos, Empresa Brasileira de Pesquisa Agropecuária (Embrapa Meio-Norte), Teresina, Piauí, Brasil, edson.bastos@embrapa.br

 http://lattes.cnpq.br/1529725001904634

Milton José Cardoso, Embrapa Meio-Norte

Possui graduação em Engenharia Agronômica pela Universidade Federal do Ceará (1973), mestrado em Fitotecnia pela Universidade Federal do Rio Grande do Sul (1978) e doutorado em Fitotecnia (Produção Vegetal) pela Universidade Federal de Viçosa (1985). Atualmente é pesquisador iii da Empresa Brasileira de Pesquisa Agropecuária. Tem experiência na área de Agronomia, com ênfase em Fisiologia de Plantas Cultivadas, Fitotecnia, Fertilidade de Solo e Nutrição de Plantas atuando principalmente nos seguintes temas: zea mays, vigna unguiculata, phaseolus vulgaris, cultivar, interação genótipo x ambiente, manejo cultural, produtividade e variedade.

Diléia Rocha Pereira, Universidade Federal do Piauí, Teresina, Piauí, Brasil, dileia01@hotmail.com

http://lattes.cnpq.br/0395368257210173

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Published

2018-07-16

How to Cite

SILVA DE SOUSA, R.; ALVES BASTOS, E.; JOSÉ CARDOSO, M.; ROCHA PEREIRA, D. Identification of drought-tolerant corn genotypes by multivariate analysis. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 48, n. 3, p. 204–211, 2018. Disponível em: https://revistas.ufg.br/pat/article/view/52122. Acesso em: 22 dec. 2024.

Issue

v. 48, n. 3, Jul./Sep. 2018

Section

Research Article

License

Authors will not be paid for published articles and must waive their copyright in favor of the PAT journal. On the other hand, they are solely responsible for the content of those articles, even if the Editor holds the right to adjust them to the norms of the journal. Authors are allowed to publish their articles simultaneously in their institutional repositories, as soon as the original publication at the PAT journal is mentioned.