RESUMOAtualmente, das 6.721 espécies consideradas de importância econômica 7% possuem sementes que, além de serem sensíveis à dessecação, não toleram armazenamento sob baixas temperaturas, dificultando sua conservação por períodos prolongados. A curta longevidade restringe o prazo de utilização das sementes, sendo necessário realizar a semeadura logo após sua extração dos frutos, ou tentar conservá-las sob condições adequadas de temperatura, embalagem e, principalmente, de teor de água; sementes com teores de água acima de 10% a 13%, a incidência de microorganismos pode comprometer sua viabilidade. Estudos técnico-científicos têm revelado características ecológicas, morfológicas e fisiológicas das sementes recalcitrantes que podem contribuir para o aprimoramento de suas técnicas de propagação. Com base nas informações literárias disponíveis, esta revisão tem por objetivo abordar os principais problemas encontrados após a colheita dessas sementes. Palavras-chave: sementes recalcitrantes, conservação. ABSTRACT RECALCITRANTS SEEDS: POST-HARVEST PROBLEMSAt present, 7% of 6.721 species with some economic importance have seeds that are sensitive to dehydration and do not tolerate storage at low temperatures. The short longevity can reduce the time of seeds utilization, being necessary either to sow then immediately after fruit extraction, or to maintain them under adequate conditions of temperature, storage and water content. Also, seeds with water content above 10%-13% could have the viability reduced by the action of microorganisms. Some studies show ecological, morphological and physiological characteristics of recalcitrant seeds, which can contribute to improve propagation techniques. Therefore based on available literature, this revision was carried out to approach the main problems that can be found after harvesting of recalcitrant seeds.
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