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标题：O grau de sensibilidade ao dessecamento das sementes da palmeira amazônica Oenocarpus bacaba depende do critério de germinação
其他标题：Degree of seed desiccation sensitivity of the Amazonian palm Oenocarpus bacaba depends on the criterion for germination
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作者：BASTOS, Lydiane Lucia de Sousa ; CALVI, Geângelo Petene ; LIMA JÚNIOR, Manuel de Jesus Vieira 等
期刊名称：Acta Amazonica
印刷版ISSN：0044-5967
出版年度：2021
卷号：51
期号：2
页码：85-90
DOI：10.1590/1809-4392202001951
出版社：Instituto Nacional de Pesquisas da Amazônia
摘要：Across the seed-seedling transition, several germination criteria are used in studies of palm-seed germination. In Oenocarpus bataua, these criteria have differential tolerance to thermal stress. In this study, we evaluated the tolerance of germination criteria to seed desiccation of the congeneric Oenocarpus bacaba. We dried seeds to different moisture contents (MC) before scoring first cataphyll, second cataphyll, enclosed eophyll and expanded eophyll. Seeds without drying had 41.7% MC. Germination success reached close to 70% after 75 and 105 days, depending on the germination criterion. Safe MC was close to initial MC and all seeds were dead with MC < 26.7%. As the primordial organs of the cataphylls and the eophyll are already detectable in the palm-seed embryo, all were affected by drying. Critical MC, defined here as 50% loss of germination capacity, increased from 35.4% (first cataphyll) to 37.1% (expanded eophyll) and confirmed that, across the seed-seedling transition, more advanced germination stages had a higher sensitivity to desiccation. During germination and development, the criteria appear in sequence over several weeks. Consequently, the desiccation damage was only detectable when the last criterion was evaluated. To avoid an underestimation of damages, we suggest that seed-stress studies in palms should take into account an adequate period for seedling development, which, for O. bacaba, was 105 days until the expansion of the eophyll.
关键词：Arecaceae;dessecamento;sementes recalcitrantes;plântulas;estresse
其他关键词：Arecaceae;drying;recalcitrant seeds;seedling;stress