Physiological basis of differential aluminum tolerance in rice genotypes

Ganesan, K. N.; Sankaranarayanan, C.; Balakumar, T.

doi:10.1080/00103629309368947

Cited by 16 publications

(15 citation statements)

References 22 publications

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“…They are comparatively more tolerant to Al than the Asian varieties used by Sivaguru and Paliwal (1993) and Ganesan et al (1993). In this study, we aimed to verify whether these cultivars, like other rice cultivars (Meriga et al 2004;Sharma and Dubey, 2007;Meriga et al 2010;Ma et al 2012) and other species (Cakmak and Horst, 1991;Peixoto et al, 1999;Boscolo et al, 2003;Dipierro et al, 2005;Achary et al, 2008), suffer from oxidative stress in the presence of toxic levels of Al and how this toxic element influences the activity of antioxidant enzymes and the balance of the ascorbate system.…”

Section: Discussionmentioning

confidence: 99%

Antioxidant system response induced by aluminum in two rice cultivars

Ribeiro

Cambraia

Peixoto

et al. 2012

Braz. J. Plant Physiol.

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The antioxidant defense system response was evaluated in two rice cultivars (Oryza sativa L.), Fernandes (CNA-1158) and Maravilha (CNA-6843-1), treated with toxic levels of aluminum. After exposure to aluminum we determined plant growth, H 2 O 2 and O 2•-contents, lipid peroxidation, antioxidant enzymes activities and ascorbate and dehydroascorbate contents. Al predominantly accumulated in roots of both cultivars but it reduced root and shoot growth only in the Maravilha cultivar. Treatment with aluminum resulted in a reduction of 84 and 60% in the levels of H 2 O 2 in the roots of the cultivars Maravilha and Fernandes, respectively, and of 26% in the levels of O 2•-only in the roots of Fernandes cultivar. Increased lipid peroxidation was observed only in the roots of the Maravilha cultivar. In general, the antioxidant enzyme activities were higher in roots and increased in the presence of aluminum, especially in the Fernandes cultivar. The levels of ascorbate were higher in leaves and increased with aluminum treatment, while dehydroascorbate decreased in roots of both cultivars after aluminum treatment. However, the ascorbate/dehydroascorbate ratio increased in the roots of both cultivars after treatment with aluminum. Ascorbate, dehydroascorbate and ascorbate/dehydroascorbate levels found here point to an efficient regeneration of ascorbate, essential for the homeostasis of cellular metabolites involved in reactive oxygen species removal by rice plants treated with aluminum. Therefore, the higher tolerance of Fernandes to aluminum relative to Maravilha cultivar may be the result of better growth of the root system and shoots, higher antioxidant enzyme activities and a best use/ regeneration of ascorbate.

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Section: Discussionmentioning

confidence: 99%

Antioxidant system response induced by aluminum in two rice cultivars

Ribeiro

Cambraia

Peixoto

et al. 2012

Braz. J. Plant Physiol.

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“…It was proposed that a pH shift in the rhizosphere may be responsible for Al tolerance in rice. Sivaguru and Paliwal (1993) and Ganesan et al (1993) found that an increase in pH of a nutrient solution by Al-tolerant rice cultivars is higher than by Al-sensitive cultivars. However, the pH in their experiments was monitored after a long period of exposure to Al.…”

Section: Al Tolerance Mechanisms In Ricementioning

confidence: 99%

Response of Rice to Al Stress and Identification of Quantitative Trait Loci for Al Tolerance

Feng

Shen

Zhao

et al. 2002

Plant and Cell Physiology

236

193

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“…A maior elevação do pH, causada por essa cultivar, parece ter ocorrido pela sua maior capacidade de absorver NO 3 -, mediada pelo simporte H + /NO 3 - (Tischner, 2000), conforme sugere Ganesan et al (1993). Essa mesma cultivar, quando cultivada em solução nutritiva contendo NH 4 + , em qualquer proporção ou, até mesmo, sendo a única fonte de N, foi, também, a que liberou mais prótons para a solução nutritiva.…”

Section: Resultsunclassified

“…De acordo com essa hipóte-se, as plantas tolerantes seriam capazes de elevar o pH da rizosfera e, assim, reduzir a solubilidade e a absorção do Al, aliviando, conseqüentemente, os efeitos fitotóxicos desse íon (Silva et al, 2002). Essa capacidade tem sido encontrada em várias espécies de importância econô-mica, inclusive em algumas cultivares de arroz de origem asiática (Ganesan et al, 1993;Sivaguru & Paliwal, 1993).…”

Section: Introductionunclassified

“…No trigo, a tolerância das plantas ao Al parece estar ligada à capacidade de elas utilizarem nitrato na presença de amônia, e de aumentarem o pH do meio de crescimento (Taylor & Foy, 1985 (Cambraia et al, 1987). No arroz, foi verificado que a cultivar tolerante além de elevar o pH da solução nutritiva, mais do que a sensível, foi capaz de metabolizar o nitrato com maior eficiência em presença de Al (Ganesan et al, 1993;Sivaguru & Paliwal, 1993). Como o mecanismo de tolerância ao Al em arroz é ainda pouco conhecido, especialmente em cultivares nacionais, e há grande possibilidade de a nutrição nitrogenada estar intimamente relacionada com essa tolerância ao Al, resolveu-se realizar a presente pesquisa.…”

Section: Introductionunclassified

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