Characteristics of the root system in two Brazilian upland rice varieties which exhibit contrasting behavior towards drought tolerance
Root system architecture plays a fundamental role in the adaptation of rice to environments subjected to abiotic stresses. This study aimed to characterize the root architecture and morphology of two Brazilian upland rice varieties which display contrasting behavior towards drought tolerance: the to...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Universidade Estadual de Londrina
2020-03-01
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| Series: | Semina: Ciências Agrárias |
| Subjects: | |
| Online Access: | https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/33708 |
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| author | Leandro Martins Ferreira Cristiana Maia de Oliveira Leilson Novaes Arruda Renan Pinto Braga Orlando Carlos Huertas Tavares Sonia Regina de Souza Manlio Silvestre Fernandes Leandro Azevedo Santos |
| author_facet | Leandro Martins Ferreira Cristiana Maia de Oliveira Leilson Novaes Arruda Renan Pinto Braga Orlando Carlos Huertas Tavares Sonia Regina de Souza Manlio Silvestre Fernandes Leandro Azevedo Santos |
| author_sort | Leandro Martins Ferreira |
| collection | DOAJ |
| description | Root system architecture plays a fundamental role in the adaptation of rice to environments subjected to abiotic stresses. This study aimed to characterize the root architecture and morphology of two Brazilian upland rice varieties which display contrasting behavior towards drought tolerance: the tolerant Catetão and susceptible Mira varieties. Two experiments were carried out under greenhouse and growth chamber conditions. The experimental design was completely randomized in a 2 × 2 factorial scheme (varieties × drought stress conditions) with four replicates. Rice varieties were subjected to control and drought conditions for 14 days. Drought stress was applied either by withholding water until the desirable soil tension was achieved or by addition of 20% polyethylene glycol 6000 (PEG) to the nutritive solution. After harvest, the dry weight, root architecture, as well as physiological and root features were assessed. Under drought stress, a higher root biomass was recorded in Catetão compared to Mira. A higher ratio of deep rooting (RDR) was observed for Catetão, while Mira remained stable in response to drought stress. The evaluated physiological features showed that the Catetão variety is less likely to compromise membrane integrity and lipid peroxidation during drought stress. Moreover, analyzed root features exhibited a significant increase in lateral root emission and root density for Catetão in response to drought treatment, which may be considered an important feature when selecting for superior genotypes. |
| first_indexed | 2024-04-10T20:41:26Z |
| format | Article |
| id | doaj.art-5ca8d9a0ed994d259614d796855ff2f7 |
| institution | Directory Open Access Journal |
| issn | 1676-546X 1679-0359 |
| language | English |
| last_indexed | 2024-04-10T20:41:26Z |
| publishDate | 2020-03-01 |
| publisher | Universidade Estadual de Londrina |
| record_format | Article |
| series | Semina: Ciências Agrárias |
| spelling | doaj.art-5ca8d9a0ed994d259614d796855ff2f72023-01-24T19:41:07ZengUniversidade Estadual de LondrinaSemina: Ciências Agrárias1676-546X1679-03592020-03-0141210.5433/1679-0359.2020v41n2p421Characteristics of the root system in two Brazilian upland rice varieties which exhibit contrasting behavior towards drought toleranceLeandro Martins Ferreira0Cristiana Maia de Oliveira1Leilson Novaes Arruda2Renan Pinto Braga3Orlando Carlos Huertas Tavares4Sonia Regina de Souza5Manlio Silvestre Fernandes6Leandro Azevedo Santos7Instituto Federal de Educação, Ciência e Tecnologia de Mato Grosso do SulInstituto Federal de Educação, Ciência e Tecnologia de Mato Grosso do SulCompanhia Nacional de AbastecimentoUniversidade Federal Rural do Rio de JaneiroUniversidade Federal Rural do Rio de JaneiroUniversidade Federal Rural do Rio de JaneiroUniversidade Federal Rural do Rio de JaneiroUniversidade Federal Rural do Rio de JaneiroRoot system architecture plays a fundamental role in the adaptation of rice to environments subjected to abiotic stresses. This study aimed to characterize the root architecture and morphology of two Brazilian upland rice varieties which display contrasting behavior towards drought tolerance: the tolerant Catetão and susceptible Mira varieties. Two experiments were carried out under greenhouse and growth chamber conditions. The experimental design was completely randomized in a 2 × 2 factorial scheme (varieties × drought stress conditions) with four replicates. Rice varieties were subjected to control and drought conditions for 14 days. Drought stress was applied either by withholding water until the desirable soil tension was achieved or by addition of 20% polyethylene glycol 6000 (PEG) to the nutritive solution. After harvest, the dry weight, root architecture, as well as physiological and root features were assessed. Under drought stress, a higher root biomass was recorded in Catetão compared to Mira. A higher ratio of deep rooting (RDR) was observed for Catetão, while Mira remained stable in response to drought stress. The evaluated physiological features showed that the Catetão variety is less likely to compromise membrane integrity and lipid peroxidation during drought stress. Moreover, analyzed root features exhibited a significant increase in lateral root emission and root density for Catetão in response to drought treatment, which may be considered an important feature when selecting for superior genotypes.https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/33708Drought escapeLateral rootsRoot plasticityRatio of deep rooting. |
| spellingShingle | Leandro Martins Ferreira Cristiana Maia de Oliveira Leilson Novaes Arruda Renan Pinto Braga Orlando Carlos Huertas Tavares Sonia Regina de Souza Manlio Silvestre Fernandes Leandro Azevedo Santos Characteristics of the root system in two Brazilian upland rice varieties which exhibit contrasting behavior towards drought tolerance Semina: Ciências Agrárias Drought escape Lateral roots Root plasticity Ratio of deep rooting. |
| title | Characteristics of the root system in two Brazilian upland rice varieties which exhibit contrasting behavior towards drought tolerance |
| title_full | Characteristics of the root system in two Brazilian upland rice varieties which exhibit contrasting behavior towards drought tolerance |
| title_fullStr | Characteristics of the root system in two Brazilian upland rice varieties which exhibit contrasting behavior towards drought tolerance |
| title_full_unstemmed | Characteristics of the root system in two Brazilian upland rice varieties which exhibit contrasting behavior towards drought tolerance |
| title_short | Characteristics of the root system in two Brazilian upland rice varieties which exhibit contrasting behavior towards drought tolerance |
| title_sort | characteristics of the root system in two brazilian upland rice varieties which exhibit contrasting behavior towards drought tolerance |
| topic | Drought escape Lateral roots Root plasticity Ratio of deep rooting. |
| url | https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/33708 |
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