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TOLERANCE MECHANISMS OF “SARACURA” (BRS 4154) MAIZE VARIETY TO FLOODING

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Author(s): JOSÉ DONIZETI ALVES | MARCELO MURAD MAGALHÃES | PATRÍCIA DE FÁTIMA PEREIRA GOULART | BÁRBARA FRANÇA DANTAS | JORGE ALBERTO DE GOUVÊA | RÚBIA PADILHA PURCINO | PAULO CÉSAR MAGALHÃES | DANIELA DEITOS FRIES | DÁRLAN EINSTEIN DO LIVRAMENTO | LAUDIENE EVANGELISTA MEYER | MARINA SEIFFERT | THIAGO SILVEIRA

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 1;
Issue: 1;
Start page: 41;
Date: 2002;
Original page

Keywords: hipoxia | calcium | cell wall | enzymes

ABSTRACT
This review aims at discussing the tolerance mechanisms developed by“Saracura” (BRS 4154) maize variety, that has, as a main characteristic, the tolerance tointermitent soil waterlogging. The first studies related to tolerance under low oxygen levels inthe enviroment were performed in controlled conditions in growth chambers, and confirmedthis characteristic when seedlings tolerated up to four days of hypoxia without any apparentdamage. At this time, seedlings showed in the mesocotyl region, a translucid area, characteristicof stress development, causing wilting, falling off and death. The next studies showed thatoxygen deficiency caused an intense and irreversible cell wall degradation as a result of anincrease in polygalacturonase and celulase activities. The causes of maize Saracura tolerancewere attributed to a resistance to cell wall enzymes, aerenchyma development in shoot androot and the high photosyntetic recovery capacity after flooding periods. When calcium wasadded during germination, it was noted a decrease in seedlings size and an increase in floodingtolerance, delaying the appearance of constriction in mesocotyl. During germinationcarbohydrates reserves were kept in cariopsis, on presence of calcium delaying the seedlingdevelopment, and when in flooding conditions these compounds were allocated and used,prolongating the celular metabolism. It was also verified that calcium increased the cell wallstability and induced osmotic adjustment by increasing aminoacids concentrarion, mainly proline.
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