Summary
Seedling emergence and subsequent growth from untreated seeds and selected‐germinated seeds which had been dried before sowing (low‐moisture‐content germinated (LMCG) seeds) were compared in ...cellular trays in a glasshouse and in the field following transplanting. Three seed lots of different quality of the same cultivar were used for cabbage and cauliflower. In all cases, seedling emergence was greater, earlier and more uniform from LMCG seed than that from untreated seeds. LMCG seed effectively eliminated the differences due to seed quality shown by untreated seeds at emergence suggesting an improvement in seed vigour as well as viability from the selection treatment. Higher quality seed and LMCG cauliflower seed led to larger curd weights and therefore an increase in marketable yield at harvest compared to that from lower quality seeds. However, differences in transplant uniformity due to seed quality and seed treatment had little impact of agronomic significance following transplanting.
RESUMO Bauhinia forficata Link é uma espécie arbórea de interesse medicinal e agronômico. Devido à importância da espécie objetivou-se avaliar características da germinação de B. forficata, bem como ...a capacidade desta espécie em manter a tolerância à dessecação após a germinação. Os resultados indicam B. forficata como uma espécie com capacidade de reindução de tolerância à dessecação. Através de eletromicrografias de varredura foi possível entender os efeitos positivos de uma secagem lenta em sementes germinadas. Conclui-se então que B. forficata possui capacidade de re-indução de tolerancia à dessecação com até 4mm de comprimento de radícula, quando tratada com solução de PEG à -1,4MPa.
The moisture content of newly germinated cabbage seed (radicles 1 ±0·5 mm long) was reduced to 14% of f.wt without loss of viability. As the moisture content was reduced below 45%, the temperature at ...which the germinated seeds froze, and therefore died, decreased progressively to a minimum of −34 °C at 19% moisture content. No freezing exotherms were recorded in seeds with moisture contents below 19%. Seeds with a moisture content between 14 and 16% maintained viability for at least 1 week when cooled at 2·6°C.min−1 to −20 °C and held at this temperature, indicating the potential for prolonged storage of these low-moisture-content germinated (LMCG) seeds.
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