Morpho-Physiological Traits and Oil Quality in Drought-Tolerant Raphanus sativus L. Used for Biofuel Production

Author:

Moura Luciana Minervina de Freitas12,Costa Alan Carlos da123,Müller Caroline12ORCID,Silva-Filho Robson de Oliveira1,Almeida Gabriel Martins1,Silva Adinan Alves da12,Capellesso Elivane Salete4ORCID,Cunha Fernando Nobre5,Teixeira Marconi Batista25ORCID

Affiliation:

1. Laboratório de Ecofisiologia e Produtividade Vegetal, Instituto Federal de Educação, Ciência e Tecnologia Goiano, Campus Rio Verde, Rio Verde 75901-970, GO, Brazil

2. Centro de Excelência em Agricultura Exponencial (CEAGRE), Rua das Turmalinas, 44—Vila Maria, Rio Verde 75905-360, GO, Brazil

3. Centro de Excelência em Bioinsumos (CEBIO), Rua 88, 30—Setor Sul, Goiânia 74085-010, GO, Brazil

4. Laboratório de Ecologia Vegetal, Universidade Federal do Paraná—Centro Politécnico, 100, Curitiba 81530-000, PR, Brazil

5. Laboratório de Hidráulica e Irrigação, Instituto Federal de Educação, Ciência e Tecnologia Goiano, Campus Rio Verde, Rio Verde 75901-970, GO, Brazil

Abstract

Raphanus sativus L. is a potential source of raw material for biodiesel fuel due to the high oil content in its grains. In Brazil, this species is cultivated in the low rainfall off-season, which limits the productivity of the crop. The present study investigated the effects of water restriction on the physiological and biochemical responses, production components, and oil quality of R. sativus at different development stages. The treatments consisted of 100% water replacement (control), 66%, and 33% of field capacity during the phenological stages of vegetative growth, flowering, and grain filling. We evaluated characteristics of water relations, gas exchange, chlorophyll a fluorescence, chloroplast pigment, proline, and sugar content. The production components and chemical properties of the oil were also determined at the end of the harvest cycle. Drought tolerance of R. sativus was found to be mediated primarily during the vegetative growth stage by changes in photosynthetic metabolism, stability of photochemical efficiency, increased proline concentrations, and maintenance of tissue hydration. Grain filling was most sensitive to water limitation and showed a reduction in yield and oil content. However, the chemical composition of the oil was not altered by the water deficit. Our data suggest that R. sativus is a drought-tolerant species.

Funder

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Instituto Federal de Educação, Ciência e Tecnologia Goiano (IFGoiano), Campus Rio Verde

Centro de Excelência em Agricultura Exponencial

Centro de Excelência em Bioinsumos

Fundação de Amparo à Pesquisa do Estado de Goiás

Financiadora de Estudos e Projetos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Publisher

MDPI AG

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