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Viabilidade de sementes de mucuna-preta em função do tamanho, da maturação e da secagem = Effects of seed size, maturation and drying on viability of velvet bean seeds

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Author(s): João Nakagawa | Cláudio Cavariani | Claudemir Zucareli | Cibele Chalita Martins

Journal: Acta Scientiarum : Agronomy
ISSN 1679-9275

Volume: 29;
Issue: 1;
Start page: 107;
Date: 2007;
Original page

Keywords: Mucuna aterrima | maturação | tamanho de sementes | secagem | Mucuna aterrima | maturation | seed size | drying

ABSTRACT
O objetivo do trabalho foi estudar os efeitos do tamanho da semente e da forma de secagem, durante a maturação, sobre a qualidade fisiológica das sementes. Rácemos foram colhidos semanalmente, a partir de 40 dias após 50% de florescimento (40 DAF) das plantas até o estádio de vagens secas (89 DAF). As vagens foram separadas ao longo do eixo do rácemo, sendo a metade delas abertas, extraídas as sementes e estas postas para secarem em condições de ambiente de laboratório, sem controle de temperatura e U.R. do ar; a outra metade foi deixada secar nas mesmas condições e as sementes foram extraídas após as vagens estarem secas. As sementes secas foram classificadas por peneiras de crivo circular e calculada as porcentagens de retenção. As retidas nas peneiras 26/64”, 24/64” e 22/64”(respectivamente, 10,32 mm, 9,52 mm e 8,73 mm), tamanhos predominantes, foram submetidas ao teste de germinação. A secagem no interior da vagem resultou em sementes de melhor qualidade fisiológica, independente do estádio de maturação e do tamanho. Assementes maiores provenientes de vagens secas (89DAF) apresentaram menor porcentagem de sementes duras.The aim of this work was to study the effects of seed size and drying way during seed maturation on physiological quality of velvet bean (Mucuna aterrima (Piper et Trace) Holland) seeds. Racemes were harvested weekly, starting 40 days after 50% blooming of the plants (40 DAB) and ending at dry pod stage (89 DAB). The pods of theracemes were divided in two halves considering the position in the axis; half of pods was shelled and the seeds were dried in natural environment conditions of laboratory without air temperature control and relative humidity; the other half was dried as intact pod in sameenvironment conditions and shelled when dry. The dry seeds were sized by sieves with round holes and the percentages of the size-graded by width were calculated. The seeds held on sieves 26/64”, 24/64” and 22/64” (10.32, 9.52 and 8.73 mm, respectively), the predominant sizes, were submitted to germination test. The drying in intact pods resulted in seeds with best physiological quality, independent of maturation stage and seed size. The large seeds coming from dry pods presented less hard seeds percentage.
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