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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
10/06/2002 |
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Data da última atualização: |
10/06/2002 |
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Autoria: |
ANDRADE, L. R. M. de; IKEDA, M.; ISHIZUKA, J. |
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Título: |
Physiological basis on Al tolerance in wheat cultivars. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
In: INTERNATIONAL SYMPOSIUM ON IMPACT OF POTENTIAL TOLERANCE OF PLANTS ON THE INCREASED PRODUCTIVITY UNDER ALUMINIUM STRESS, 2000, Kurashiki, Japan. Program and abstracts. |
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Páginas: |
p. 113-115. |
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Idioma: |
Inglês |
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Conteúdo: |
We investigated the hypothesis that excretion of organic acid is a mechanism of Al tolerance in wheat. Seedings of Al-tolerant wheat cultivars, Atlas 66 (AT) and Shirosanjyaku (SH), and Al-sensitive ones, Chikushikomugi (CK) and Saitama 27 (AS), were exposured to Al in experiments lasting from 40 minutes to 24 hours. Al induced differential pH changes in the solution. Al triggered 3-5 fold more malate in Al-tolerant cultivars than the Al-sensitive anes. Citrate in root exudates was not detected. The Al absorbed by roots of SH na CK within 2-hour tretment was mainly apoplasmically associated and could be removed from this compartment by an Al na chelator (citrate), as indicated by the lack of hematoxylin staiming of roots tips. The effect os Al on the metabolism of malate, synthesized via dark carbon fixation in roots demosntrated that Al triggered 14C excretion and malate to solution, mainly in SH. However, Al decreased malate concentrations in roots of both cultivars. These results suggest taht differential Al tolerant between SH and CK consited of the greater ability of the Al tolerant cultivar to excrete malic acid from roots and not and not due to its concentration in the roots. |
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Palavras-Chave: |
Aluminium; Cultivar; Wheats. |
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Thesagro: |
Alumínio; Trigo; Triticum Aestivum. |
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Thesaurus NAL: |
varieties. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01923naa a2200241 a 4500
001 1564929
005 2002-06-10
008 2000 bl uuuu u00u1 u #d
100 1 $aANDRADE, L. R. M. de
245 $aPhysiological basis on Al tolerance in wheat cultivars.
260 $c2000
300 $ap. 113-115.
520 $aWe investigated the hypothesis that excretion of organic acid is a mechanism of Al tolerance in wheat. Seedings of Al-tolerant wheat cultivars, Atlas 66 (AT) and Shirosanjyaku (SH), and Al-sensitive ones, Chikushikomugi (CK) and Saitama 27 (AS), were exposured to Al in experiments lasting from 40 minutes to 24 hours. Al induced differential pH changes in the solution. Al triggered 3-5 fold more malate in Al-tolerant cultivars than the Al-sensitive anes. Citrate in root exudates was not detected. The Al absorbed by roots of SH na CK within 2-hour tretment was mainly apoplasmically associated and could be removed from this compartment by an Al na chelator (citrate), as indicated by the lack of hematoxylin staiming of roots tips. The effect os Al on the metabolism of malate, synthesized via dark carbon fixation in roots demosntrated that Al triggered 14C excretion and malate to solution, mainly in SH. However, Al decreased malate concentrations in roots of both cultivars. These results suggest taht differential Al tolerant between SH and CK consited of the greater ability of the Al tolerant cultivar to excrete malic acid from roots and not and not due to its concentration in the roots.
650 $avarieties
650 $aAlumínio
650 $aTrigo
650 $aTriticum Aestivum
653 $aAluminium
653 $aCultivar
653 $aWheats
700 1 $aIKEDA, M.
700 1 $aISHIZUKA, J.
773 $tIn: INTERNATIONAL SYMPOSIUM ON IMPACT OF POTENTIAL TOLERANCE OF PLANTS ON THE INCREASED PRODUCTIVITY UNDER ALUMINIUM STRESS, 2000, Kurashiki, Japan. Program and abstracts.
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